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Special sampling device for online chromatographic analysis system

A sampling device and chromatographic analysis technology, which is applied in the field of special sampling devices for online chromatographic analysis systems, and can solve the problems of sample component changes, poor analysis result accuracy and stability repeatability, etc.

Active Publication Date: 2012-10-24
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 the existing online chromatographic analysis system is used for complex reaction systems, especially when the online chromatographic analysis of high temperature and high pressure, special samples and complex samples with a wide boiling range, etc. Due to the change of sample components caused by leakage, condensation blockage and cracking, etc., which lead to the problem of poor accuracy and stability of the analysis results, a new special sampling device for online chromatographic analysis system is provided.

Method used

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  • Special sampling device for online chromatographic analysis system
  • Special sampling device for online chromatographic analysis system
  • Special sampling device for online chromatographic analysis system

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Experimental program
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Effect test

Embodiment 1

[0019] use figure 1 The shown dedicated sampling device for online chromatographic analysis, under the condition that the reactor is filled with quartz sand instead of the catalyst, analyzes the self-prepared mixed standard sample continuously for 6 times. The typical valve switching conditions are shown in Table 1. Among them, the composition of the standard sample and the results of the 6 parallel analyses are shown in Table 2. The analysis results show that the online chromatographic analysis special sampling device, when performing online chromatographic analysis, the analysis result is consistent with the actual composition of the sample, and the relative standard deviation does not exceed 0.5%, which can fully meet the routine online chromatographic analysis

[0020] Table 1 Valve switching conditions

[0021]

[0022] Table 2 Standard sample analysis results

[0023]

Embodiment 2

[0025] use figure 1 The shown dedicated sampling device for online chromatographic analysis, under the condition that reactor 1 is filled with catalyst and the catalyst is running stably (the operating stage where the conversion rate is basically unchanged), the actual reaction mixture is analyzed in parallel for 5 consecutive times, and Compare the online analysis results with the offline analysis results, see Table 3.

[0026] Table 3 Standard sample analysis results

[0027]

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Abstract

The invention relates to a special sampling device for an online chromatographic analysis system to mainly solve problems of bad analytic result accuracy, bad analytic result stability and bad analytic result repeatability caused by middle and high voltage seepage, condensation obstruction, cracking and the like in acquisition and transmission of a sample in present online chromatographic analysis. The device is characterized in that connection pipelines 54, 55, 56 and 57 which can independently control and adjust the temperature are adopted to respectively let samples in reactors 1, 2, 3 and 4 to into six-way valves 21, 22, 23 and 24; and the samples are respectively acquired by quantitative rings 25, 26, 27 and 28, are carried by carrying gases 29, 30, 31 and 32 to enter the shunting introduction port 36 of a gas chromatograph, and are transmitted from a sample outlet to sample tanks 41, 42, 43 and 44 through two-way valves 37, 38, 39 and 40 respectively. The device well solves the problems through above technical scheme, and can be used for the sample acquisition in online chromatographic analysis.

Description

Technical field [0001] The invention relates to a special sampling device for an online chromatographic analysis system. Background technique [0002] Many complex reaction systems make it difficult to realize online chromatographic analysis. The current analysis method is mainly offline analysis, that is, the product is divided into gas and liquid phases after condensation, and they are collected online (weighing liquid product and measuring volume of gas product). It is realized by analyzing its composition separately offline. In the process of sample collection, storage and offline analysis, the product is very easy to run away or even deteriorate. The gas and liquid phases will be entrained with each other, resulting in poor data reliability and difficulty in constant calculation of materials. At the same time, the analysis time and cycle are long, and the operation is cumbersome . Online chromatography has become an important analysis tool indispensable for daily productio...

Claims

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Application Information

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IPC IPC(8): G01N30/20
Inventor 高枝荣王川李继文
Owner CHINA PETROLEUM & CHEM CORP
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