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Chromatographic analysis method for propane product in production of process for preparing olefin from methanol

A methanol-to-olefins and analysis method technology, applied in the field of component analysis of propane products, can solve problems such as inability to analyze propane products

Active Publication Date: 2019-02-22
CHINA COAL ORDOS ENERGY CHEM COP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a chromatographic analysis method for propane products in the production of a methanol-to-olefins process in order to overcome the problem that the prior art cannot analyze dimethyl ether and acetaldehyde in the propane product produced by the MTO process. The dual-channel technology of the chromatograph adopts the dual-column analysis method, which comprehensively solves the problem of accurate quantitative analysis of propane-related material components in the MTO process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Gas chromatography conditions:

[0029] Gas chromatograph: Agilent 7890B gas chromatograph

[0030] Chromatographic column: Column 1: PLOT-Q capillary column 30m×0.53mm×40um

[0031] Column 2: HP-AL / S capillary column 50m×0.53mm×15um

[0032] Column temperature: 40°C, keep for 3min, then increase to 190°C at a rate of 10°C / min, keep for 40min

[0033] Column flow rate: 6ml / min

[0034] Injection port temperature: 250°C

[0035] FID detector temperature: 300°C

[0036] Carrier gas: high purity nitrogen

[0037] Hydrogen flow rate: 30ml / min

[0038] Air flow: 400ml / min

[0039] Makeup gas flow: 25ml / min

[0040] Split ratio: 1:30

[0041] (2) Create a correction table

[0042] The standard gas volume percentage composition is: propane 10%, cyclopropane 0.1%, propylene 2%, isobutane 0.5%, n-butane 0.5%, propadiene 0.01%, trans-2-butene 0.5%, 1-butane ene 0.5%, isobutene 0.5%, cis-2-butene 0.5%, isopentane 0.01%, n-pentane 0.01%, 1.3 butadiene 0.5%, propyne 0...

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Abstract

The invention relates to the field of propane product detection and discloses a chromatographic analysis method for a propane product in the production of a process for preparing olefin from methanol.The method is implemented in a gas chromatograph with double detecting channels; the first detecting channel is disposed with a PLOT-Q capillary column and an FID detector; the second detecting channel is disposed with an HP-AL / S capillary-column chromatography and an FID detector; and the method comprises the following steps: (1) carrying out sample introduction analysis on a standard gas by using the gas chromatograph; (2) establishing a correction table by virtue of the components of the standard gas and according to an external standard quantitation method for area; (3) analyzing a sampleof the propane product produced by using a process for preparing olefin from methanol by adopting the gas chromatograph; and (4) carrying out data analysis and processing according to an analysis result obtained in the step (3) and the correction table. By using the method disclosed by the invention, the components of the propane product can be accurately analyzed, and the effect for accurate andquantitative analysis for propane correlated material components in an MTO process is comprehensively solved.

Description

technical field [0001] The invention relates to the technical field of component analysis of propane products, in particular to a chromatographic analysis method for propane products in the production of methanol to olefins process. Background technique [0002] With the exploration and refining of oil, propane has become one of the main products. In the olefin chemical industry, which uses light hydrocarbon naphtha as the main cracking raw material, propane is also one of the main by-products. The components of these propane products are mainly carbon one to carbon four hydrocarbons, basically no oxygen-containing compounds. With the development and maturity of methanol-to-olefin (MTO) industrial technology in recent years, the sources of propane are more abundant, but the propane produced in the MTO process chain contains 1% to 15% dimethyl ether and 0.01% to 0.4% acetaldehyde , the content of cyclopropane is 2%~4%, the content of propadiene is 40ppm~90ppm, and the conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/04
CPCG01N30/04G01N30/88G01N2030/047G01N2030/884
Inventor 王国安黄万顺张迎辉郭宁宁刘杰
Owner CHINA COAL ORDOS ENERGY CHEM COP LTD