GB/T 11132-2022Test method for hydrocarbon types in liquid petroleum products - Fluorescent indicator adsorption (English PDF)

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 11132-2008, Test method for hydrocarbon types in liquid petroleum products - Fluorescent indicator adsorption. Compared with GB/T 11132-2008, apart from structural adjustments and editorial changes, the main technical changes are as follows:

- the clause "Significance and use" has been deleted (see Clause 5 of the 2008 edition);

- an optional pressurised gas connection for the adsorption column and its schematic diagram have been added (see 5.1.4 and Figure 2);

- the method of fixing the adsorption column at the end of the ruler has been deleted (see 10.2 of the 2008 edition);

- the determination of the pH value of the silica gel has been changed into a table footnote (see Table 2; 7.1 of the 2008 edition);

- a calculation note for samples containing oxygenates has been added (see 10.2);

- report content for samples containing oxygenate blending components has been added (see 11.2);

- the sample range to which the precision Tables 3 and 4 apply has been changed (see Note to Table 3 and Note 1 to Table 4; 1.4 of the 2008 edition);

- the applicable content ranges of the hydrocarbon types in Table 4 have been changed (see Table 4; Table 4 of the 2008 edition).

Attention is drawn to the possibility that some elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This document was proposed by and is under the jurisdiction of the National Technical Committee on Petroleum Products and Lubricants of Standardization Administration of China (SAC/TC 280).

Drafting organisation of this document: SINOPEC Fushun Research Institute of Petroleum and Petrochemicals (China Petroleum and Chemical Corporation).

Main drafters of this document: Zhao Bin, Geng Chenchen, Gui Xinghua and Ling Fengxiang.

The previous editions of this document and of the documents it replaces are as follows:

- first published in 1989 as GB/T 11132-1989, first revised in 2002 and revised for the second time in 2008;

- this is the third revision.

1 Scope

Warning - Persons using this document should have practical experience of formal laboratory work. The use of this document may involve hazardous materials, equipment and operations; this document does not purport to address all the safety problems that may be associated with its use. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by the relevant national regulations.

This document describes a method for the determination of hydrocarbon types in petroleum fractions boiling below 315 °C by fluorescent indicator adsorption.

This document is applicable to the determination of hydrocarbon types - total aromatics, total olefins and total saturates - in petroleum fractions boiling below 315 °C, over the following ranges: aromatics 5% to 99% by volume, olefins 1% to 55% by volume and saturates 1% to 95% by volume. This document may also be used for samples with concentrations outside these ranges, but the precision has not been determined. This document is not applicable to samples containing dark-coloured components that interfere with the reading of the hydrocarbon chromatographic bands.

This document is applicable to petroleum products of full boiling range, but statistical test data show that the precision of this document does not apply to narrow petroleum fractions boiling close to 315 °C: such samples do not separate properly and the results are unstable.

This document may also be used for automotive spark-ignition engine fuels (motor gasoline), with or without oxygenates such as alcohols and ethers (for example MTBE, ethanol), where gasoline is the main component by volume of the blend.

This document is applicable to samples containing certain oxygenate blending components. These oxygenates are methanol, ethanol, methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME) and ethyl tert-butyl ether (ETBE); at the concentrations found in normal blended products they do not interfere with the hydrocarbon type determination, as they are eluted with the alcohol desorbent and are not detected. Other oxygenates shall be verified individually. When samples containing oxygenate blending components are analysed, the results are corrected to a whole-sample basis.

It has not been established whether this document is applicable to products derived from non-petroleum fossil fuels such as coal, shale or oil sands bitumen; its precision may or may not apply to such products.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 4756 Method for manual sampling of petroleum liquids

GB/T 5816 Catalysts and adsorbents - Determination of surface area

GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth

GB/T 6536-2010 Standard test method for distillation of petroleum products at atmospheric pressure

GB/T 27867 Petroleum liquids - Automatic pipeline sampling

NB/SH/T 0663 Determination of alcohols and ethers in gasoline - Gas chromatography

SH/T 0720 Determination of oxygenates in gasoline (gas chromatography and oxygen selective flame ionization detection)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

4 Summary of the method

Approximately 0.75 mL of the sample is introduced into a glass adsorption column packed with activated silica gel, the separation section of which contains a thin layer of silica gel impregnated with a mixture of fluorescent dyes. When the whole sample has been adsorbed on the gel, alcohol is added to desorb the sample, and pressure is applied to force the sample down the column. The hydrocarbons in the sample are separated into aromatics, olefins and saturates according to their adsorption affinities. The fluorescent dyes are also selectively separated together with the hydrocarbon types, making the boundaries of the aromatic, olefin and saturate zones clearly visible under ultraviolet light. The volume fraction of each hydrocarbon type is calculated from the length of its coloured zone in the adsorption column.

5 Apparatus