GB/T 30519-2014Determination of hydrocarbon types and benzene in light petroleum distillates and products - Multidimensional gas chromatographic method (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T

1.1-2009.

This standard was proposed by the National Standardization Technical

Committee for Petroleum Products and Lubricants (SAC/TC 280).

This standard shall be under the jurisdiction of the National Petroleum

Products and Lubricants Standardization Technical Committee (SAC/TC

280/SC 1).

The responsible drafting organization of this standard. China Petroleum &

Chemical Corporation Petrochemical Research Institute.

The participating drafting organizations of this standard. National Oil Quality

Supervision and Inspection Center, China Petroleum and Natural Gas Co., Ltd.

Northeast Sales Company, China Shenhua Coal Oil Chemical Co., Ltd.

Shanghai Research Institute, Shenzhen Institute of Metrology and Quality

Inspection, China Petrochemical Co., Ltd. Company Jinan Branch.

Introduction

Light petroleum distillates and products mainly refers to solvent oil, gasoline

blending components, and finished gasoline and other substances; these

substances have low boiling point AND are easy to volatilize; AND the

aromatic hydrocarbons, benzene and olefins existed in such substances may

have an adverse effect on the health of the human body, the environment or

the stability of the product due to their own toxicity and Instability. Therefore, in

gasoline, solvent oil and other product standards, the benzene, aromatics and

olefin contents are often limited. In the production and processing links, for the

purpose of quality control, the manufacturer needs to make control analysis of

the hydrocarbon fraction in the petroleum fraction of the corresponding

distillation range. This standard test method is designed to establish a method

for the determination of hydrocarbon composition and benzene in light

petroleum distillates and products, to address the limitations or problems

existed in the current test methods.

Determination of hydrocarbon types and benzene in

light petroleum distillates and products -

Multidimensional gas chromatographic method

WARNING. This standard may involve certain hazardous materials,

operations and equipment, BUT does not advise on all safety issues

related to this. Therefore, the user shall establish appropriate safety and

protective measures before applying this standard AND determine the

applicability of the relevant regulatory restrictions.

1 Scope

This standard specifies the test methods of using multidimensional gas

chromatography technology for the determination of hydrocarbon composition

and benzene content in light petroleum distillates and products.

This standard is applicable to the determination of hydrocarbon composition

and benzene content in light petroleum distillates or products having a final

boiling point not more than 215 °C such as gasoline blending components,

solvent oils, gasoline products and the like. As for the concentration range of

determination, the volume fraction (OR mass fraction) of olefin is from 0.5% to

70%, the volume fraction (OR mass fraction) of aromatic hydrocarbon is 1% to

80%, AND the volume fraction (or mass fraction) of benzene is 0.2% to 10%.

This method is also applicable to the gasoline products processed from other

unconventional crude oils such as shale or oil sands or hydrocarbon fuels

synthesized from non-petroleum fossil fuels, such as Fischer-Tropsch

synthetic oils, provided that their boiling ranges comply with the requirements

of this standard. This method can only be used to determine the sample

exceeding the content range, BUT it cannot provide the precision data.

As for the gasoline for motor vehicles, in order to improve the performance of

gasoline products OR for other purposes, it often contains ether or alcohol

oxygen compounds, AND there may also be a variety of oxygen compounds

coexisted, in such case the ether compounds in the sample will produce peak

together with the olefin component, whilst the alcohol compounds will produce

peaks together with the C7+ aromatics component. As for the

oxygen-containing gasoline samples, after the relevant test methods (such as

SH/T 0663) are used to determine the type and content of the

oxygen-containing compounds, AND the procedures in Appendix A are

referred to make necessary corrections of the results of the hydrocarbon

composition, this standard is applicable.

This standard does not apply to the determination of monomer component

content in each hydrocarbon group except benzene.

C7+ Aromatics

The aromatic components in the light petroleum distillates or products

except for benzene, including monocyclic substituted aromatics, aromatic

olefins, and ring diene components greater than the six-membered ring.

3.5

Total aromatics or aromatic hydrocarbon

The sum of benzene (3.3) and C7+ aromatics (3.4).

3.6

Olefin traps

The column in the analytical systems which is used to selectively retain

olefinic components from mixtures of saturated hydrocarbons and olefins.

The column has a good reversibility for the capture and release of the olefin

component at a specific temperature, so it can be reused. Under certain

temperature, this column is capable of selectively retaining the olefin

component from the mixture of saturated hydrocarbons and olefins, AND let

the saturated hydrocarbon component pass through; AND the retained

olefin component is completely released after rising the temperature.

4 Method principles and summary