Online monitoring system and method for chlorine impurities in liquefied hydrocarbon raw material and application

Abstract

The invention discloses an online monitoring system for chlorine impurities in a liquefied hydrocarbon raw material. The online monitoring system comprises a main box body, an explosion-proof treatment unit, an on-line detection unit and a sample interface unit; according to the online monitoring system and method for the chlorine impurities in the liquefied hydrocarbon raw material, explosion-proof treatment is conducted, and the system and method can be directly connected with the side line of a production device. According to the gas chromatography-electron capture detector analysis methodfor chlorides in liquefied hydrocarbon raw materials, 0.05 ml / m<3> of chloride monitoring analysis can be met by optimizing and developing instruments and methods, and compared with an existing analysis method and an existing analysis technology, the detection limit of chlorides is lower; the requirement of a new generation of polyolefin catalyst on the impurity content of the liquefied hydrocarbon raw material can be met, and the sensitivity of an analysis technology is improved.

Description

technical field [0001] The invention belongs to the field of detection and analysis of petrochemical raw materials, and in particular relates to an online monitoring system, method and application of chlorine impurities in liquefied hydrocarbon raw materials. Background technique [0002] Liquefied hydrocarbon raw materials are C1-C4 liquefiable low-carbon light hydrocarbons, including C1 methane, C2 ethane, ethylene acetylene, C3 propane, propylene, propyne, C4 butane, butene, butyne, etc. It is the most important raw material for the production of petrochemical polyolefin industry, rubber industry, polyester industry, etc. Its purity and impurity content directly affect the key production indicators such as the activity of the catalyst, the safety of the production device, and the performance of the polymer material. Therefore, monitoring and analyzing the impurity content in liquefied hydrocarbon raw materials by designing and manufacturing online engineering chromatograp...

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Problems solved by technology

[0006] After research, it is found that the chloride detection technology in the prior art still has the following defects: 1) The types of chloride detection are very limited, usually no more than 3, and many of them are only for specific chlorides; 2) It can only be sampled and analyzed offline, and cannot Online real-time monitoring cannot guarantee personnel safety and sample representativeness; 3) Data processing requires manual calculation or correction, and data results cannot be processed automatically, and the result data cannot be automatically and remotely transmitted; 4) Chloride detection and analysis accuracy is not enough, aggregation Olefin catalysts require that the chloride content in the liquefied hydrocarbon feedstock be controlled at 0.05ml / m 3 Below, but the current analysis technology is difficult to achieve 0.05ml / m 3 Chloride Detection Analysis

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