ASTM D7457-12
(Test Method)Standard Test Method for Determining Chloride in Aromatic Hydrocarbons and Related Chemicals by Microcoulometry (Withdrawn 2019)
Standard Test Method for Determining Chloride in Aromatic Hydrocarbons and Related Chemicals by Microcoulometry (Withdrawn 2019)
SIGNIFICANCE AND USE
This test method is useful for determining organic as well as inorganic chloride compounds that can prove harmful to equipment and reactions in processes involving hydrocarbons. The combination of both the organic and inorganic chloride is commonly termed “total chloride” and since the inorganic chlorides are partially recovered, the result for total chloride will be biased low.
Maximum chloride levels are often specified for process streams and for hydrocarbon products.
Organic chloride species are potentially damaging to refinery processes. Hydrochloric acid can be produced in hydro treating or reforming reactors and this acid accumulates in condensing regions of the refinery.
SCOPE
1.1 This test method covers the measurement of chloride in aromatic hydrocarbons, their derivatives, and related chemicals as defined by the method. Aromatics typically do not have any source of chlorides other than organic. The presence of metallic or inorganic chlorides is theoretically possible but not likely and this method does not purport to address recovery of those compounds.
1.2 This test method is applicable to samples with chloride concentrations from 0.24 to 5.0 mg/kg. The test method limit of detection (LOD) is 0.07 mg/kg.
1.3 This test method is preferred over Test Method D5194 for products, such as styrene, that are polymerized by the sodium biphenyl reagent.
1.4 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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. For specific hazard statements, see Section 9.
WITHDRAWN RATIONALE
This test method covers the measurement of chloride in aromatic hydrocarbons, their derivatives, and related chemicals as defined by the method. Aromatics typically do not have any source of chlorides other than organic. The presence of metallic or inorganic chlorides is theoretically possible but not likely and this method does not purport to address recovery of those compounds.
Formerly under the jurisdiction of Committee D16 on Aromatic Hydrocarbons and Related Chemicals, this test method was withdrawn in November 2019. This standard is being withdrawn without replacement as it is very similar to the more widely utilized D5808 which has a scope of 1-25mg/kg and is sufficient for product specs of 1.0 mg/kg max limit.
General Information
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7457 − 12
Standard Test Method for
Determining Chloride in Aromatic Hydrocarbons and
1
Related Chemicals by Microcoulometry
This standard is issued under the fixed designation D7457; 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 2. Referenced Documents
2
1.1 This test method covers the measurement of chloride in 2.1 ASTM Standards:
aromatichydrocarbons,theirderivatives,andrelatedchemicals D1193 Specification for Reagent Water
as defined by the method.Aromatics typically do not have any D1555M TestMethodforCalculationofVolumeandWeight
sourceofchloridesotherthanorganic.Thepresenceofmetallic of Industrial Aromatic Hydrocarbons and Cyclohexane
or inorganic chlorides is theoretically possible but not likely [Metric]
and this method does not purport to address recovery of those D3437 Practice for Sampling and Handling Liquid Cyclic
compounds. Products
D3505 Test Method for Density or Relative Density of Pure
1.2 This test method is applicable to samples with chloride
Liquid Chemicals
concentrations from 0.24 to 5.0 mg/kg. The test method limit
D4052 Test Method for Density, Relative Density, and API
of detection (LOD) is 0.07 mg/kg.
Gravity of Liquids by Digital Density Meter
1.3 This test method is preferred over Test Method D5194
D5194 Test Method for Trace Chloride in Liquid Aromatic
for products, such as styrene, that are polymerized by the
Hydrocarbons
sodium biphenyl reagent.
D6809 Guide for Quality Control and Quality Assurance
Procedures for Aromatic Hydrocarbons and Related Ma-
1.4 In determining the conformance of the test results using
this method to applicable specifications, results shall be terials
E29 Practice for Using Significant Digits in Test Data to
rounded off in accordance with the rounding-off method of
Practice E29. Determine Conformance with Specifications
E691 Practice for Conducting an Interlaboratory Study to
1.5 The values stated in SI units are to be regarded as
Determine the Precision of a Test Method
standard. No other units of measurement are included in this
2.2 Other Document:
standard.
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
1.6 This standard does not purport to address all of the 3
1910.1200
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety and health practices and determine the applica-
3.1 Definitions of Terms Specific to This Standard:
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 9.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee D16 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of Standards volume information, refer to the standard’s Document Summary page on
Subcommittee D16.04 on Instrumental Analysis. the ASTM website.
3
Current edition approved Jan. 1, 2012. Published February 2012. Originally AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
ϵ1
approved in 2011. Last previous edition approved in 2011 as D7457 - 11 . DOI: 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
10.1520/D7457–12. www.access.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7457 − 12
3.1.1 calibration factor/recovery factor, n—an indication of 6.2 Bromides and iodides, if present, will be calculated as
the efficiency of the measurement computed by dividing the chlorides. However, fluorides are not detected by this test
measured value of a standard by its theoretical value. method.
3.1.2 dehydrating tube or drying vessel, n—a chamber
6.3 Both organic and inorganic chloride in the sample will
containing concentrated sulfuric acid that scrubs the combus-
be measured due to conversion of both species to HCL during
tion effluent gases to remove water vapor prior to entering the
the oxidative pyrolysis process which is commonly termed as
titration cell.
total chloride. The results for total chloride will be biased low
since the measurement of total chloride is the sum of both
3.1.3 endpoint routine/test titration, n—processes which
organic and inorganic chloride compounds in the sample and
allow the coulometer to set the endpoint and gain values to be
inorganic compounds (if present) are only partially converted.
used for sample analysis.
The measurement o
...
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