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Chromatographic method for analyzing content of trace benzene in vinyl benzene products or other hydrocarbon solvents based on flow switch

A hydrocarbon solvent and flow switching technology, applied in the field of gas chromatography, can solve the problems of difficulty in establishment and large dead volume of the valve switching system, and achieve the effects of easy establishment and operation, good technical effect, and good data precision

Active Publication Date: 2014-01-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that when analyzing trace amounts of benzene in styrene or other hydrocarbon solvents in the existing chromatographic analysis technology, the traditional valve switching technology is used, the method is difficult to establish, and the dead volume of the valve switching system is relatively large. , provides a new chromatographic method for flow switching analysis of trace amounts of benzene in styrene products or other hydrocarbon solvents

Method used

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  • Chromatographic method for analyzing content of trace benzene in vinyl benzene products or other hydrocarbon solvents based on flow switch
  • Chromatographic method for analyzing content of trace benzene in vinyl benzene products or other hydrocarbon solvents based on flow switch
  • Chromatographic method for analyzing content of trace benzene in vinyl benzene products or other hydrocarbon solvents based on flow switch

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Experimental program
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Embodiment 1

[0018] According to the flow chart in Figure 1, the standard sample of benzene was analyzed, and the typical chromatographic analysis conditions are shown in Table 1. Among them, the standard sample 1 # ~4 # Draw a calibration curve, and then use standard sample 2 # and 4 # As the sample to be tested, it was analyzed 5 times, and the benzene was quantitatively calculated from the calibration curve. The composition and analysis results of the standard samples are shown in Table 2.

[0019] Table 1 Typical chromatographic analysis conditions

[0020]

[0021] Table 2 standard sample analysis results

[0022]

[0023] The analytical data in Table 2 shows that the correlation coefficient r of the benzene calibration curve 2 It is 0.9996, the linear relationship is good, the relative error of the standard sample determination is between -0.68% and 6.4%, and the quantification is accurate.

Embodiment 2

[0025] According to the flow chart in Figure 1, the actual samples A and B of styrene were analyzed, and compared with the ASTM D6229-06 standard method measurement results. Typical chromatographic conditions are shown in Table 3, and quantitative analysis results are shown in Table 4. The results of quantitative analysis in Table 4 show that the analysis results of the two methods are consistent.

[0026] Table 3 typical chromatographic analysis conditions

[0027]

[0028] Table 4 actual styrene sample analysis results

[0029]

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Abstract

The invention relates to a chromatographic method for analyzing the content of trace benzene in vinyl benzene products or other hydrocarbon solvents based on flow switch, which mainly solves the problems of great difficulty in the establishment of a method and large dead volume of a valve switch system owing to the adoption of the conventional valve switch technology for analyzing the trace benzene in the vinyl benzene products or the other hydrocarbon solvents in the existing chromatographic analysis technology. The problem is perfectly solved by a technical scheme comprising the following steps that: a sample of the vinyl benzene products or the other hydrocarbon solvents is pre-separated by a chromatographic column (5), benzene is cut to a chromatographic column (11) by a flow switch center cutting system (13) to be further separated, and then, the cut benzene is detected by a hydrogen flame ionization detector (10) and quantified through an external standard method, and other components flowing out of the chromatographic column (5) enter into the hydrogen flame ionization detector (10) via a damping column (2) for being detected. The method can be used in industrial production of chromatographic analysis on the content of the trace benzene in the vinyl benzene products or the other hydrocarbon solvents.

Description

technical field [0001] The invention relates to a gas chromatography method for flow switching analysis of trace amounts of benzene in styrene products or other hydrocarbon solvents. Background technique [0002] Styrene (SM) is an important basic organic chemical raw material, mainly used in the production of polystyrene resin (PS), acrylonitrile-butadiene-styrene (ABS) resin, styrene-acrylonitrile copolymer (SAN ) resin, styrene-butadiene rubber (SBR), ion exchange resin, unsaturated polyester and styrene-based thermoplastic elastomer (such as SBS), etc. In addition, it can also be used in industries such as pharmaceuticals, dyes, pesticides, and mineral processing, and has a wide range of uses. At present, the main production process of styrene is to generate ethylbenzene by alkylation of benzene, and then dehydrogenate to generate styrene. my country's styrene industry is developing rapidly, newly built, rebuilt and expanded plants are put into operation, and the outpu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/28
Inventor 李薇李继文彭振磊王川
Owner CHINA PETROLEUM & CHEM CORP