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GB/T 32492-2016Content of dimethyl ether in liquefied petroleum gas by gas chromatography (English PDF)

液化石油气中二甲醚含量气相色谱分析法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

February 24, 2016

Implementation date

January 1, 2017

Scope

GB/T 32492-2016 is the English-translated version of 液化石油气中二甲醚含量气相色谱分析法.

GB/T 32492-2016 is the Chinese standard "Content of dimethyl ether in liquefied petroleum gas by gas chromatography". Its scope clause reads: This standard specifies the method for determination of liquefied petroleum gas dimethyl ether content by gas chromatography.

This standard applies to the determination of liquefied petroleum gas dimethyl ether content. Its clauses include terms and definitions; principle of the method.

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Document preview — GB/T 32492-2016

National Standard of the People's Republic of China

ICS: 75.160.30
Classification: P 45

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
2 Normative references
3 Terms and Definitions
4 principle of the method

1 Scope

This standard specifies the method for determination of liquefied petroleum gas dimethyl ether content by gas chromatography.

This standard applies to the determination of liquefied petroleum gas dimethyl ether content.

2 Normative references

The following documents for the application of this document is essential. For cited documents with dates, only the dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 4946 GC term

GB/T 5274 gas analyzer calibration weighing method for preparing a mixed gas

3 Terms and Definitions

GB/T 4946 defined the terms and definitions apply to this document.

4 principle of the method

4.1

Under the selected chromatographic conditions of work, the gas sample into the chromatographic system, through the column so that DME and LPG effective separation of the components, note the peak value of DME.

Under the same chromatographic operating conditions with external standard method known standard gas dimethyl ether content of the sample is measured in the peak value of DME and DME standard gas chromatographic peak value calculated by comparing DME content in the sample.

4.2

component separation in the column should meet the following requirements (see Figure 1).

a) When component content greater than or equal to 5%, A/B should be greater than 0.8;

b) when the component content is less than 5%, A/B should be greater than 0.4;

c) In the sub-group adjacent to the large component, take the small peak of the slope as a baseline.

A/B ratio of the legend of team points Peak A/B ratio of Legends

Explanation.

A --- deep valley between two peaks;

B --- two adjacent peaks high above the baseline of the smaller peak.

Figure 1 fractionation effect on column […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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