Device and method for monitoring hydrocarbon composition in liquefied hydrocarbon on line and application

Abstract

The invention discloses a device for monitoring hydrocarbon composition in liquefied hydrocarbon on line. The device comprises a main box body, an explosion-proof treatment unit, an on-line detectionunit and a sample interface unit. According to the device and the method for monitoring the hydrocarbon composition in the liquefied hydrocarbon on line, the side line of a production device can be directly connected through explosion-proof treatment. According to the gas chromatography hydrogen flame detector analysis method for the hydrocarbon composition in the liquefied hydrocarbon raw material, 0.50 ml / m < 3 > hydrocarbon composition 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 the hydrocarbon composition is lower, and the detection types are more comprehensive; 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, in particular to a device, method and application for on-line monitoring of hydrocarbon composition in liquefied hydrocarbons. 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 chromatography is the premise...

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Problems solved by technology

[0006] After research, it is found that the hydrocarbon composition detection technology in the prior art still has the following defects: 1) It can only take offline sampling and analysis, but cannot achieve online real-time monitoring, and cannot guarantee personnel safety and sample representativeness; 2) Data processing requires artificial calculation or Calibration, data results cannot be automatically processed, and the result data cannot be automatically transmitted remotely; 2) The detection and analysis accuracy of hydrocarbon composition is not enough, polyolefin catalysts require that the hydrocarbon composition content in liquefied hydrocarbon raw materials be controlled at 0.50ml / m 3 Below, but the current analysis technology is difficult to achieve 1.0ml / m 3 The detection and analysis of hydrocarbon composition

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