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Method for analyzing products for removing alkene

An analysis method and a technology for removing olefins, which is applied in the field of gas chromatography parallel dual detector analysis, can solve the problems of long analysis time, olefin identification errors, and inability to judge the removal degree of olefin impurities in time, so as to shorten the analysis time and avoid errors Effect

Inactive Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the degree of removal of olefin impurities in the de-olefin products in the prior art can only be judged whether the olefins are completely removed through the olefin structure identification experiment and the content determination experiment. Misidentification occurs and the degree of removal of olefin impurities in the de-olefinic product cannot be judged in time, and a new gas chromatography parallel dual-detector analysis method for the de-olefinic product is provided

Method used

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  • Method for analyzing products for removing alkene
  • Method for analyzing products for removing alkene

Examples

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Embodiment 1

[0027] Adopt the present invention, measure the deolefin product in [Comparative Example 1]. The experimental conditions of gas chromatography, mass spectrometry detector and hydrogen flame ionization detector are the same as those in [Comparative Example 1].

[0028] The capillary column outlet splitter is a three-way plate splitter, the inner wall of each channel in it is inertized, the length is 1.5cm, and the inner diameter is 0.15mm; the length of the first restrictor column is 0.40m, the inner diameter is 0.10mm, The length of the second limiting column is 0.25m, and the inner diameter is 0.10mm, all of which are deactivated elastic quartz capillaries.

[0029] Such as figure 2 Shown, is the total ion current figure (black line A) and chromatogram (red line B) local enlarged figure of this product on the mass spectrometry detector of the present invention and hydrogen flame ionization detector, each component profile, peak shape and retention There is almost no deviat...

Embodiment 2

[0032] Adopt the present invention, measure the deolefin product in [Comparative Example 1]. The experimental conditions of gas chromatography, mass spectrometry detector and hydrogen flame ionization detector are the same as those in [Comparative Example 1].

[0033] The capillary column outlet splitter is a three-way valve splitter, the inner wall of each channel in it is inertized, the length is 1.0cm, and the inner diameter is 0.10mm; the length of the first restrictor column is 1.0m, the inner diameter is 0.20mm, The length of the second limiting column is 0.40m, and the inner diameter is 0.10mm, all of which are deactivated elastic quartz capillaries.

[0034] Separation by gas chromatography, mass spectrometry detector and hydrogen flame ionization detector simultaneously obtain structure identification and content determination information. The whole running time is only 45 minutes, which is half of the analysis time of [Comparative Example 1], as shown in Table 1.

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Abstract

The invention relates to a method for analyzing products for removing alkene, and mainly solves the problems that in the prior art alkene impurity removing degree in existed products for removing alkene can only be determined separately by alkene structure identification experiments and content determination experiments in order to know whether alkene is completely removed, the analysis process takes a long time, and when alkene identification appears error, alkene impurity removing degree in the alkene removing products cannot be determined timely. Gas chromatography parallel double-detector apparatus is used, and the alkene removing products are treated by gas chromatography sample introduction, chromatographic column separation, capillary column outlet current divider, and detection by two parallel different detectors; alkene structure and content information in the products are obtained at the same time, and alkene impurity removing degree in the alkene removing products can be determined timely. The technical scheme can better solve the problems and is suitable for quality control of alkene removing products.

Description

technical field [0001] The invention relates to a gas chromatography parallel double detector analysis method for deolefin products. Background technique [0002] The fraction above C8 after catalytic reforming oil is raffinated is the main raw material for the production of xylene and other chemical raw materials. Since the reformed oil is rich in aromatics, it also contains a small amount of olefins. The molecular size of these olefins is close to that of aromatics, and their chemical properties are active. Not only are they easy to form colloids, but they may also react with other components to form non-ideal components. Affecting the quality of aromatic products, more importantly, these olefins will enter the pores of the adsorbent during the adsorption separation process and accumulate in the pores, thus significantly affecting the separation effect. In addition, in some high-temperature equipment such as the reboiler of the xylene rectification tower, olefins can easi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 彭振磊王川张育红
Owner CHINA PETROLEUM & CHEM CORP
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