ISO 27927:2025
(Main)Carbon dioxide capture — Key performance parameters and characterization methods of absorption liquids for post-combustion CO2 capture
Carbon dioxide capture — Key performance parameters and characterization methods of absorption liquids for post-combustion CO2 capture
This document provides definitions, guidelines and supportive information for the key performance parameters and their characterization methods of absorption liquids used in post-combustion CO2 capture. It covers common methodologies to measure and calculate specific key performance parameters of the absorption liquids. The absorption liquids for post-combustion CO2 capture covered by this document are chemically reactive liquids, such as amine solutions, potassium carbonate solutions, aqueous ammonia, amino-acid salt solutions and mixtures of these reactants. Other absorption liquids based on different principles for CO2 capture are not covered. The key performance parameters considered in this document relate to the design and operation of absorption liquid-based post-combustion CO2 capture processes, as well as equipment such as absorber and desorber columns, reboilers and other heat exchangers. The key performance parameters are: — primary parameters, such as rich and lean CO2 loading, absorbent concentration, absorption capacity, heat of absorption, absorption rate and absorbent volatility; — secondary parameters, such as cyclic loading, that are directly derived from the primary parameters, or combined with other physical measurements, as in the case for the absorbent loss rate. In addition, physical and chemical properties such as density, viscosity, pH, thermal conductivity and specific heat capacity are described. These properties are essential for understanding the key performance parameters of the absorption liquids. This document also: — establishes key performance parameters (see REF Section_sec_4 \r \h Clause 4 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E000000530065006300740069006F006E005F007300650063005F0034000000 ), physical and chemical properties of absorption liquids, and their calculation methods, and provides a common way of reporting them; — specifies the general requirements for the absorption liquid characterization in laboratory measurement and field testing (see REF Section_sec_5 \r \h Clause 5); — provides the requirements for the instrumentation to be installed or used, and guidelines for the characterization methods (see REF Section_sec_6 \r \h Clause 6 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E000000530065006300740069006F006E005F007300650063005F0036000000 ); — provides information on the characterization methods of absorption liquids, describing all stages of test preparation, set-up and execution (see Annexes A to I), as well as guidance on sampling absorption liquids. NOTE While key performance parameters of absorption liquids are important process indicators for post-combustion CO2 capture, factors such as process design, equipment design and manufacturing, economics and safety are also considered for a comprehensive evaluation of post-combustion CO2 capture technology. The document does not provide guidelines for benchmarking or comparing absorption liquids for post-combustion capture processes, nor does it offer methods to assess different technologies or projects, or specify methodologies for process engineering design. Additionally, the document is not intended to compel technology owners to disclose any intellectual properties related to their proprietary absorption liquids. The document does not cover all available and emerging characterization methods for the key performance parameters considered in this document.
Captage du dioxyde de carbone — Paramètres clés de performance et méthodes de caractérisation des liquides d'absorption pour le captage du CO2 post-combustion
General Information
Buy Standard
Standards Content (Sample)
International
Standard
ISO 27927
First edition
Carbon dioxide capture — Key
2025-09
performance parameters and
characterization methods of
absorption liquids for post-
combustion CO capture
Captage du dioxyde de carbone — Paramètres clés de
performance et méthodes de caractérisation des liquides
d'absorption pour le captage du CO post-combustion
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, abbreviated terms and symbols . 2
3.1 Terms and definitions .2
3.2 Abbreviated terms .6
3.3 Symbols .6
4 Evaluation of performance parameters . 8
4.1 General .8
4.2 Primary performance parameters .9
4.2.1 Rich and lean CO loading .9
4.2.2 Absorbent concentration .10
4.2.3 CO absorption capacity .11
4.2.4 Heat of absorption .11
4.2.5 Absorption rate. 12
4.2.6 Absorbent volatility . 13
4.3 Secondary performance parameters . 13
4.3.1 Cyclic loading . 13
4.3.2 Absorbent loss rate. 13
4.4 Physical and chemical properties .14
5 General for the characterization of absorption liquids . 14
5.1 Laboratory measurements and field testing .14
5.2 General requirement . 15
6 Instrument and characterization methods .16
6.1 General .16
6.2 Instrument classification .16
6.3 Calibration of instrument .16
6.4 Evaluation of measurement uncertainty .16
6.5 Competence in characterization methods .17
Annex A (informative) Methods for sampling absorption liquids used in post-combustion CO
capture demonstration system .18
Annex B (informative) Summary for the characterization methods of primary performance
parameters of absorption liquids used in post-combustion CO capture .22
Annex C (informative) Characterization methods for evaluating carbon dioxide loading .24
Annex D (informative) Characterization methods for evaluating absorbent concentration .30
Annex E (informative) Characterization methods for evaluating CO absorption capacity .40
Annex F (informative) Characterization methods for evaluating heat of absorption .46
Annex G (informative) Characterization methods for evaluating absorption rate .50
Annex H (informative) Characterization methods for evaluating absorbent volatility .58
Annex I (informative) Characterization methods for evaluating physical and chemical
properties of absorption liquids .66
Bibliography .68
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 265, Carbon dioxide capture, transportation
and geological storage.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Carbon dioxide capture and storage (CCS) is a suite of technologies to reduce carbon dioxide (CO )
emissions into the atmosphere, as a central aspect of reducing overall greenhouse gas emissions that are
causing climate change. CCS is widely recognized to play a crucial role in achieving deep and large-scale
decarbonization in a short time frame in the power and industrial sectors. Among several CO capture
pathways, post-combustion CO capture (PCC) is the most mature and viable, capable of reducing CO
2 2
emissions from combustion processes in the energy-related and industrial sectors. Chemical absorption
using reactive liquids is a proven technology and has been widely developed in numerous PCC facilities.
Various absorption liquids, such as amines, potassium carbonate, aqueous ammonia solutions, amino-acid
salt solutions and mixtures of these reactants, have been adopted for PCC applications.
The performance of absorption liquids is one of the key factors influencing the cost and the energy
consumption in a PCC process, thereby influencing its commercial application and its net greenhouse gas
impact. Understanding the key performance parameters and physical and chemical properties of absorption
liquid is essential, not only for screening of promising absorption liquids, but also for process engineering
design and evaluating PCC plant performance during operation.
Specifically, accurate monitoring of CO loading and absorbent concentration in the absorption liquid
will guide parametric measurement, optimization, commissioning and operation of the PCC plant.
Understanding the absorption capacity helps in selecting the appropriate absorption liquid for CO capture,
and optimizing the process conditions using information from vapour-liquid equilibria. A larger cyclic
loading of CO in the absorption liquid means that less absorption liquid needs to be circulated, leading
to lower energy consumption for pumping, heating and cooling. Absorbent volatility is one of the factors
leading to absorbent loss. The heat of absorption of CO is a primary factor influencing the energy required
for regenerating absorption liquids. The viscosity of absorption liquids can affect absorber flooding, and
electricity consumption for pumping. A higher viscosity of the absorption liquid also reduces the heat
transfer coefficient for the heat exchanger, meaning more heat exchanger area is required to achieve the
same heat duty. It also decreases the absorption and mass transfer between gas and liquid. The absorption
rate of absorption liquids impacts the capital costs of the PCC process. A higher absorption rate of the
absorption liquids enables a shorter packing height in CO capture, which reduces the sizes of the absorber
and desorber. The density and viscosity are physical and chemical properties of absorption liquids. The
thermal conductivity and specific heat capacity are important thermophysical properties to understand the
heat transfer process in absorption liquid-based CO capture process.
Given the large and diverse impact of absorption liquids on various aspects of PCC plant performance, an
ISO standard for evaluating and characterizing the key performance parameters of absorption liquids is
required and that would
...
FINAL DRAFT
International
Standard
ISO/FDIS 27927
ISO/TC 265
Carbon dioxide capture — Key
Secretariat: SCC
performance parameters and
Voting begins on:
characterization methods of
2025-05-01
absorption liquids for post-
Voting terminates on:
combustion CO capture
2025-06-26
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 27927:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 27927:2025(en)
International
Standard
ISO/FDIS 27927
ISO/TC 265
Carbon dioxide capture — Key
Secretariat: SCC
performance parameters and
Voting begins on:
characterization methods of
absorption liquids for post-
Voting terminates on:
combustion CO capture
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 27927:2025(en) © ISO 2025
ii
ISO/FDIS 27927:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, abbreviated terms and symbols . 2
3.1 Terms and definitions .2
3.2 Abbreviated terms .6
3.3 Symbols .6
4 Evaluation of performance parameters . 8
4.1 General .8
4.2 Primary performance parameters .10
4.2.1 Rich and lean CO loading .10
4.2.2 Absorbent concentration .11
4.2.3 CO absorption capacity .11
4.2.4 Heat of absorption . 12
4.2.5 Absorption rate. 12
4.2.6 Absorbent volatility . 13
4.3 Secondary performance parameters .14
4.3.1 Cyclic loading .14
4.3.2 Absorbent loss rate.14
4.4 Physical and chemical properties .14
5 General for the characterization of absorption liquids .15
5.1 Laboratory measurements and field testing . 15
5.2 General requirement . 15
6 Instrument and characterization methods .16
6.1 General .16
6.2 Instrument classification .16
6.3 Calibration of instrument .17
6.4 Evaluation of measurement uncertainty .17
6.5 Competence in characterization methods .17
Annex A (informative) Methods for sampling absorption liquids used in post-combustion CO
capture demonstration system .18
Annex B (informative) Summary for the characterization methods of primary performance
parameters of absorption liquids used in post-combustion CO capture .22
Annex C (informative) Characterization methods for evaluating carbon dioxide loading .24
Annex D (informative) Characterization methods for evaluating absorbent concentration .30
Annex E (informative) Characterization methods for evaluating CO absorption capacity .40
Annex F (informative) Characterization methods for evaluating heat of absorption .46
Annex G (informative) Characterization methods for evaluating absorption rate .50
Annex H (informative) Characterization methods for evaluating absorbent volatility .58
Annex I (informative) Characterization methods for evaluating physical and chemical
properties of absorption liquids .66
Bibliography .68
iii
ISO/FDIS 27927:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 265, Carbon dioxide capture, transportation
and geological storage.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/FDIS 27927:2025(en)
Introduction
Carbon dioxide capture and storage (CCS) is a suite of technologies to reduce carbon dioxide (CO )
emissions into the atmosphere, as a central aspect of reducing overall greenhouse gas emissions that are
causing climate change. CCS is widely recognized to play a crucial role in achieving deep and large-scale
decarbonization in a short time frame in the power and industrial sectors. Among several CO capture
pathways, post-combustion CO capture (PCC) is the most mature and viable, capable of reducing CO
2 2
emissions from combustion processes in the energy-related and industrial sectors. Chemical absorption
using reactive liquids is a proven technology, and has been widely developed in numerous PCC facilities.
Various absorption liquids, such as amines, potassium carbonate, aqueous ammonia solutions, amino-acid
salt solutions and mixtures of these reactants, have been adopted for PCC applications.
The performance of absorption liquids is one of the key factors influencing the cost and the energy
consumption in a PCC process, thereby influencing its commercial application and its net greenhouse gas
impact. Understanding the key performance parameters and physical and chemical properties of absorption
liquid is essential, not only for screening of promising absorption liquids, but also for process engineering
design and evaluating PCC plant performance during operation.
Specifically, accurate monitoring of CO loading and absorbent concentration in the absorption liquid
will guide parametric measurement, optimization, commissioning and operation of the PCC plant.
Understanding the absorption capacity helps in selecting the appropriate absorption liquid for CO capture,
and optimizing the process conditions using information from vapour-liquid equilibria. A larger cyclic
loading of CO in the absorption liquid means that less absorption liquid needs to be circulated, leading
to lower energy consumption for pumping, heating and cooling. Absorbent volatility is one of the factors
leading to absorbent loss. The heat of absorpti
...
ISO/DISFDIS 27927:2024(en)
ISO/TC 265/WG 1
Secretariat: SCC
Date: 2025-04-16
Carbon dioxide capture
– — Key performance parameters and characterization methods
of absorption liquids for post-combustion CO2 capture
Second edition
Date: 2025-01-08
ISO 27927-#:####(X)
FDIS stage
2 © ISO #### – All rights reserved
ISO/FDIS 27927:2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Fax: +41 22 749 09 47
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
iii
ISO/FDIS 27927:2025(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, abbreviated terms and symbols . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 7
3.3 Symbols . 7
4 Evaluation of performance parameters . 8
4.1 General. 8
4.2 Primary performance parameters . 11
4.3 Secondary performance parameters . 15
4.4 Physical and chemical properties . 16
5 General for the characterization of absorption liquids . 16
5.1 Laboratory measurements and field testing . 16
5.2 General requirement . 16
6 Instrument and characterization methods . 18
6.1 General. 18
6.2 Instrument classification . 18
6.3 Calibration of instrument . 18
6.4 Evaluation of measurement uncertainty . 18
6.5 Competence in characterization methods . 19
Annex A (informative) Methods for sampling absorption liquids used in post-combustion CO
capture demonstration system . 20
Annex B (informative) Summary for the characterization methods of primary performance
parameters of absorption liquids used in post-combustion CO2 capture . 26
Annex C (informative) Characterization methods for evaluating carbon dioxide loading . 28
Annex D (informative) Characterization methods for evaluating absorbent concentration . 35
Annex E (informative) Characterization methods for evaluating CO2 absorption capacity . 46
Annex F (informative) Characterization methods for evaluating heat of absorption . 53
Annex G (informative) Characterization methods for evaluating absorption rate . 58
Annex H (informative) Characterization methods for evaluating absorbent volatility . 68
Annex I (informative) Characterization methods for evaluating physical and chemical
properties of absorption liquids . 77
Bibliography . 79
iv
ISO/FDIS 27927:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 265, Carbon dioxide capture, transportation and
geological storage.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
ISO/FDIS 27927:2025(en)
Introduction
Carbon dioxide capture and storage (CCS) is a suite of technologies to reduce carbon dioxide (CO2) emissions
into the atmosphere, as a central aspect of reducing overall greenhouse gas emissions that are causing climate
change. CCS is widely recognized to play a crucial role in achieving deep and large-scale decarbonization in a
short time frame in the power and industrial sectors. Among several CO capture pathways, post-combustion
CO capture (PCC) is the most mature and viable, capable of reducing CO emissions from combustion
2 2
processes in the energy-related and industrial sectors. Chemical absorption using reactive liquids is a proven
technology, and has been widely developed in numerous PCC facilities. Various absorption liquids, such as
amines, potassium carbonate, aqueous ammonia solutions, amino-acid salt solutions, and mixtures of these
reactants, have been adopted for PCC applications.
The performance of absorption liquids is one of the key factors influencing the cost and the energy
consumption in a PCC process, thereby influencing its commercial application and its net greenhouse gas
impact. Understanding the key performance parameters and physical and chemical properties of absorption
liquid is essential, not only for screening of promising absorption liquids, but also for process engineering
design and evaluating PCC plant performance during operation.
Specifically, accurate monitoring of CO loading and absorbent concentration in the absorption liquid will
guide parametric measurement, optimization, commissioning and operation of the PCC plant. Understanding
the absorption capacity helps in selecting the appropriate absorption liquid for CO capture, and optimizing
the process conditions using information from vaporvapour-liquid equilibria. A larger cyclic loading of CO in
the absorption liquid means that less absorption liquid needs to be circulated, leading to lower energy
consumption for pumping, heating and cooling. Absorbent volatility is one of the factors leading to absorbent
loss. The heat of absorption of CO2 is a primary factor influencing the energy required for regenerating
absorption liquids. The viscosity of absorption liquids can affect absorber flooding, and electricity
consumption for pumping. A higher viscosity of the absorption liquid also reduces the heat transfer coefficient
for the heat exchanger, meaning more heat exchanger area is required to achieve the same heat duty. It also
decreases the absorption and mass transfer between gas and liquid. The absorption rate of absorption liquids
impacts the capital costs of the PCC process. A higher absorption rate of the absorption liquids enables a
shorter packing height in CO capture, which reduces the sizes of the absorber and desorber. The density and
viscosity are physical and chemical properties of absorption liquids. The thermal conductivity and specific
heat capacity are important thermophysical properties to understand the heat transfer process in absorption
liquid-based CO capture process.
Given the large and diverse impact of absorption liquids on various aspects of PCC plant performance, an ISO
standard for evaluating and characterizing the key performance parameters of absorption liquids is required.
Such a standard is part of a series of and that would complement the standards for CO2 capture,
complementing the ISO 27919-1 and ISO 27919-2. Previously, ISO 27919-1 was developed as a guideline for
measuring, evaluating and reporting the performance of a PCC plant integrated into a power plant. It provides
a general methodology for calculating specific key performance indicators for the PCC process within the
entire power system. ISO 27919-2 was developed to specify an evaluation procedure to ensure and maintain
the stable performance of the PCC process integrated into a power plant during operation, from a
commissioning perspective.
The measurement and evaluation of the key physical and chemical characteristics of absorption liquids, as
defined in this document, are essential. This will benefit technology developers for the subsequent PCC
process design, optimization, performance monitoring, and plant operation.
vi
ISO/FDIS 27927:2025(en)
Carbon dioxide capture — Key performance parameters and
characterization methods of absorption liquids for post-combustion
CO2 capture
1 Scope
1.1 This document provides definitions, guidelines and supportive information for the key performance
parameters and their characterization methods of absorption liquids used in post-combustion CO capture. It
covers common methodologies to measure and calculate specific key performance parameters of the
absorption liquids.
The absorption liquids for post-combustion CO2 capture covered by this document are chemically reactive
liquids, such as amine solutions, potassium carbonate solutions, aqueous ammonia, amino-acid salt solutions,
and mixtures of these reactants. Other absorption liquids based on different principles for CO capture are not
covered.
1.2 The key performance parameters considered in this standarddocument relate to the design and
operation of absorption liquid-based post-combustion CO2 capture processes, as well as equipment such as
absorber and desorber columns, reboilers, and other heat exchangers.
The key performance parameters are as follows:
a) a) primary parameters, such as rich and lean CO loading, absorbent concentration, absorption capacity,
heat of absorption, absorption rate, and absorbent volatility;
b) b) secondary parameters, such as cyclic loading, that are directly derived from the primary parameters,
or combined with other physical measurements, as in the case for the absorbent loss rate.
In addition, physical and chemical properties such as density, viscosity, pH, thermal conductivity, and specific
heat capacity are described. These properties are essential for understanding the key performance
parameters of the absorption liquids.
1.3 The following items are included in This docu
...
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