ASTM D2421-02(2007)
(Practice)Standard Practice for Interconversion of Analysis of C5 and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis
Standard Practice for Interconversion of Analysis of C<i><inf>5</inf></i> and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis
SIGNIFICANCE AND USE
For custody transfer and other purposes, it is frequently necessary to convert a component analysis of light hydrocarbon mixture from one basis (either gas-volume, liquid volume, or mass) to another.
The component distribution data of light hydrocarbon mixtures can be used to calculate physical properties such as relative density, vapor-pressure, and calorific value. Consistent and accurate conversion data are extremely important when calculating vapor, liquid, or mass equivalence.
SCOPE
1.1 This practice describes the procedure for the interconversion of the analysis of C5 and lighter hydrocarbon mixtures to gas-volume (mole), liquid-volume, or mass basis.
1.2 The computation procedures described assume that gas-volume percentages have already been corrected for nonideality of the components as a part of the analytical process by which they have been obtained. These are numerically the same as mole percentages.
1.3 The procedure assumes the absence of nonadditivity corrections for mixtures of the pure liquid compounds. This is approximately true only for mixtures of hydrocarbons of the same number of carbon atoms, and in the absence of diolefins and acetylenic compounds.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D2421 − 02(Reapproved 2007)
Standard Practice for
Interconversion of Analysis of C and Lighter Hydrocarbons
to Gas-Volume, Liquid-Volume, or Mass Basis
This standard is issued under the fixed designation D2421; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1 mL gas at 15.6°C (60°F), 101.3 kPa (760 mm Hg),
1.1 This practice describes the procedure for the intercon-
version of the analysis of C and lighter hydrocarbon mixtures L 5 ~273.16/288.72! 3 ~M/22414! (1)
to gas-volume (mole), liquid-volume, or mass basis.
3 1/ relative density 3 0.99904
@ @~ ! ~ !##
1.2 The computation procedures described assume that
gas-volume percentages have already been corrected for non-
4.2251 310 3 M/relative density
~ !
idealityofthecomponentsasapartoftheanalyticalprocessby
5millilitres liquid at 15.6°C ~60°F!
which they have been obtained. These are numerically the
same as mole percentages.
where:
1.3 The procedure assumes the absence of nonadditivity
M = molecular mass of the pure compound,
corrections for mixtures of the pure liquid compounds. This is
and
approximately true only for mixtures of hydrocarbons of the
Relative density = relative density, 15.6/15.6°C (60/60°F)
same number of carbon atoms, and in the absence of diolefins (vacuum), of the pure compound.
and acetylenic compounds.
2.3 Where ideal gas volumes have been measured at tem-
1.4 The values stated in SI units are to be regarded as the peratures and pressures different from 15.6°C (60°F) at 101.3
standard. The values given in parentheses are for information
kPa (760 mm Hg), they must be corrected to these conditions.
only.
3. Significance and Use
1.5 This standard does not purport to address all of the
3.1 For custody transfer and other purposes, it is frequently
safety concerns, if any, associated with its use. It is the
necessary to convert a component analysis of light hydrocar-
responsibility of the user of this standard to establish appro-
bon mixture from one basis (either gas-volume, liquid volume,
priate safety and health practices and determine the applica-
or mass) to another.
bility of regulatory limitations prior to use.
3.2 The component distribution data of light hydrocarbon
2. Source of Data
mixtures can be used to calculate physical properties such as
2.1 The basic values for the relative density 15.6/15.6°C relative density, vapor-pressure, and calorific value. Consistent
(60/60°F) of the pure compounds have been obtained from the and accurate conversion data are extremely important when
Thermodynamics Research Center, Texas A & M University, calculating vapor, liquid, or mass equivalence.
except where otherwise noted. The values for methane,
4. Procedure
ethylene, and acetylene are not those of pure materials but are
4.1 To convert from the original to the desired basis,
assumed to apply as a component of a liquid mixture.
multiplyordividethepercentofeachcompoundintheoriginal
2.2 The conversion factors for 1 mL of ideal gas at 15.6°C
basis according to the schedule shown in Table 1. Perform the
(60°F) and 101.3 kPa (760 mm Hg) to millilitres of liquid at
calculation, using the corresponding factor indicated in Table
15.6°C (60°F) have been calculated as follows:
2. Carry at least one more significant figure in all of the
calculations than the number of significant figures in the
original analysis.
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum NOTE 1—The factors or percentages can be multiplied by any constant
Products and Lubricants and is the direct responsibility of Subcommittee D02.H0
number for convenience (such as moving the decimal) without changing
on Liquefied Petroleum Gas.
the end result.
Current edition approved May 1, 2007. Published June 2007. Originally
4.2 Add the products or quotients obtained in accordance
approved in 1965. Last previous edition approved in 2002 as D2421 – 02. DOI:
10.1520/D2421-02R07. with 4.1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D2421 − 02(Reapproved 2007)
4.3 Multiply the products or quotients obtained in accor-
dance with 4.1 by 100 divided by the sum of the products or
D2421 − 02 (2007)
TABLE 1 Conversion Factors Scheduled
Factor Column in
Original Basis Desired Basis Operation
Table 2
Gas-volume mass multiply by 1
Gas-volume liquid-volume multiply by 2
Mass gas-volume divide by 1
Mass liquid-volume divide by 3
Liquid-volume gas-volume divide by 2
Liquid-volume mass multiply by 3
TABLE 2 Mass-Volume Data for Liquefied Petroleum Gases and Low Boiling Hydrocarbons
Column 1 Column 2 Column 3
Liquid Volume in mL of
1 mL of ideal gas at Relative Density 15.6/15.6°C
Compound Molecular Mass Source
15.6°C (60°F) and (60/60°F) (Vacuum)
101.3 kPa (760 mm Hg)
A
Methane 16.043 0.002261 0.
...
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