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SN/T 2382-2009 English PDF

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SN/T 2382-2009: Determination of water in liquid petrpleum gas. Karl fischer method
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PDF similar to SN/T 2382-2009


Standard similar to SN/T 2382-2009

GB/T 19492   GB/T 18606   SY/T 0520   SN/T 2255   

Basic data

Standard ID SN/T 2382-2009 (SN/T2382-2009)
Description (Translated English) Determination of water in liquid petrpleum gas. Karl fischer method
Sector / Industry Commodity Inspection Standard (Recommended)
Classification of Chinese Standard E20
Classification of International Standard 75.060
Word Count Estimation 8,828
Date of Issue 2009-09-02
Date of Implementation 2010-03-16
Quoted Standard GB/T 6379.2; SH/T 0233; ISO 10101-1-1993; BS 2000-272-2000
Adopted Standard ISO 10101-3-1993, MOD
Regulation (derived from) Entry-Exit Inspection and Quarantine circular industry standards (2009. 09. 02)
Issuing agency(ies) General Administration of Customs
Summary This standard specifies the Karl Fischer method (coulometry) LPG direct determination of trace moisture standard methods. This standard applies to liquefied petroleum gas moisture content ranging from 5mg/m ^ 3 ~ 5000mg/m ^ 3 measurement. This standard volumetric standard reference conditions of 273. 15K (0��C), 101. 325kPa (1atm). This standard does not apply to hydrogen sulfide and mercaptan content greater than 20% water content three liquefied natural gas moisture content.

SN/T 2382-2009: Determination of water in liquid petrpleum gas. Karl fischer method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of water in liquid petrpleum gas.Karl fischer method Exit inspection and quarantine industry standard book People's Republic of China Determination of trace moisture in the LPG Karl Fischer (ISO 10101-3.1993, Naturalgas-Determinationofwaterbythe KarlFischermethod-Part 3. Coulometricprocedure, MOD) Posted 2009-09-02 2010-03-16 implementation People's Republic of China The State Administration of Quality Supervision, Inspection and Quarantine released

Foreword

This revised standard adopts ISO 10101-3.1993 "Natural gas - Determination of water content Karl Fischer method - Part 3. Coulomb Law" (In English). This standard is based on ISO 10101-3.1993 redrafted. For ease of comparison, listed in Appendix A of this standard and reg number ISO 10101-3.1993 reg control list numbered. This standard and ISO 10101-3.1993 The main differences are as follows. --- Scope Determination of natural gas by the determination of water content of liquefied petroleum gas to trace water; --- Chapter 2, according to GB/T 1.1-2000 "Standardization Guide Part 1. Standard structure and write rules" requirement Normative references to the corresponding part of the quoted standards to national standards and industry standards our country; --- Increase the Chapter 4, "reaction and interference"; --- Taking into account the differences between LPG and natural gas, according to the results of inter-laboratory collaborative trials provisions of this standard precision. Appendix A of this standard is an informative annex. This standard is proposed and managed by the National Certification and Accreditation Administration Committee. This standard was drafted. People's Republic of China, Ningbo Entry-Exit Inspection and Quarantine Bureau Technology Center. The main drafters of this standard. bud Wu, Yuan Lifeng, Yang Chao, Lin Zhenxing, Ye Lei, Shuxiong Fei, Wang Hao. This standard is the first release of the entry-exit inspection and quarantine industry standards. Determination of trace moisture in the LPG Karl Fischer

1 Scope

This standard specifies the Karl Fischer method (coulometry) standard method of liquefied petroleum gas in the direct determination of trace water. This standard applies to liquefied petroleum gas moisture content in the range of 5mg/m3 ~ 5000mg/m3 measured. This standard standard reference conditions metered volume of 273.15K (0 ℃), 101.325kPa (1atm). This standard does not apply to the determination of hydrogen sulfide and mercaptans content greater than 20% of the water content in the water used for liquefied natural gas.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) - Part 2. Determine the standard measurement method to repeat Of the basic methods of reproduction SH/T 0233 LPG sampling method 10101-1 ISO .1993 Natural gas - Determination of water content Karl Fischer method - Part 1. Guidelines BS2000-272.2000 Test methods for oil and petroleum products, liquefied petroleum gas (LPG) mercaptan sulfur and hydrogen sulfide content Potentiometric titration Principle 3 Liquefied petroleum gas is introduced into a volume of Karl Fischer titration cell, moisture from the gas are absorbed Karl Fischer reagent. with water Required for the reaction of elemental iodine, iodide ions by anodic oxidation, the amount of electricity consumed and the amount of water to produce elemental iodine and reacted with It is proportional.

4 reaction and interference

4.1 according to ISO 10101-1.1993 Karl Fischer reaction and the electrode reaction is as follows. ROH + SO2 →  + RN (RNH) · SO3R (RNH) · SO3R + 2RN + I2 + H2 → O (RNH) · SO4R + 2 (RNH) I 2I → - I2 NOTE. ROH typically methanol, can also be used ethanol, isopropanol, 2-methoxyethanol (ethylene glycol monomethyl ether) Alternatively, the RN typically pyridine, any other Alternative suitable basic nitrogen-containing compound. Hydrogen sulfide and mercaptans contained 4.2 LPG will also react with the Karl Fischer reagent occurs, causing deviation of results. When liquefied When the concentration of the gas containing hydrogen sulfide and mercaptans in less than 20% water content, 9.2 can be corrected. LPG concentrations of hydrogen sulfide and mercaptans by BS2000-272.2000 were measured.

5 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity. 5.1 Karl Fischer reagent

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