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Method for preparing olefins from synthesis gas

A synthesis gas and olefin technology, applied in the direction of hydrocarbon production from carbon oxides, purification/separation of hydrocarbons, chemical instruments and methods, etc., can solve the problems of short regeneration period, fast coking of catalysts, low yield of olefins, etc.

Active Publication Date: 2019-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the problems of fast catalyst coking, short regeneration cycle and low yield of olefins in the process of producing olefins in the existing coal chemical technology

Method used

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  • Method for preparing olefins from synthesis gas
  • Method for preparing olefins from synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The synthesis gas stream is calculated in moles, the ratio of hydrogen to carbon monoxide is 5, 10% of the stream I is recycled to the reaction zone, and 60% of the stream II is recycled back to the reaction zone. The decarburization zone uses methyldiethanolamine as the absorbent, and the dehydrogenation zone adopts the PSA separation method , catalyst life increased by 5.6%, and olefin yield increased by 1.20%.

Embodiment 2

[0039]The synthesis gas stream is calculated in moles, the ratio of hydrogen to carbon monoxide is 4, 10% of stream I is recycled back to the reaction zone, and 60% of stream II is recycled back to the reaction zone, the decarburization zone uses methyldiethanolamine as the absorbent, and the dehydrogenation zone adopts the PSA separation method , catalyst life increased by 5.4%, and olefin yield increased by 1.21%.

Embodiment 3

[0041] The synthesis gas stream is calculated in moles, the ratio of hydrogen to carbon monoxide is 3, 10% of stream I is recycled to the reaction zone, and 60% of stream II is recycled back to the reaction zone, the decarburization zone uses methyldiethanolamine as the absorbent, and the dehydrogenation zone adopts the PSA separation method , catalyst life increased by 5.2%, and olefin yield increased by 1.23%.

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Abstract

The invention relates to a method for preparing olefins from a synthesis gas, and mainly solves the problems that in the process of producing of the olefins in the existing coal chemical industry technology the catalyst is fast in coking, short in regeneration period and low in olefin yield. The method comprises the following steps: a synthesis gas material flow is reacted in a reaction zone to obtain a product material flow; the product material flow is separated into a material flow I which mainly contain carbon dioxide and a decarburized material flow through a decarbonization zone; and thedecarburized material flow is separated into a material flow ii which mainly contains carbon monoxide and hydrogen and a mixed hydrocarbon material flow through a dehydrogenation zone; the carbon dioxide-containing material flow i is at least partially recycled back to the reaction zone; and the carbon monoxide and hydrogen containing flow ii is at least partially recycled back to the reaction zone; according to the method, the problems are well solved, and the method can be used in the production of low-carbon olefin products, and has the advantage of low catalyst coking, long regeneration period, and high olefin yield.

Description

technical field [0001] The invention relates to a method for preparing olefins from synthesis gas, in particular to a method for preparing olefins from synthesis gas in one step. technical background [0002] Olefins, especially ethylene, propylene and butene, are basic organic chemical feedstocks in great demand, mainly from petroleum processing. With the increasing shortage of petroleum resources, the development of the technology of producing propylene from non-petroleum resources such as coal or natural gas has attracted more and more attention at home and abroad. The production of olefins from methanol is the most promising new technology to replace the petroleum route. It is a mature process technology to produce synthesis gas from coal or natural gas, and then to produce methanol and dimethyl ether from the synthesis gas. Therefore, the production of olefins from methanol is a key technology in the coal-to-olefins route. [0003] The current mature coal-to-olefins ...

Claims

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Application Information

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IPC IPC(8): C07C1/04C07C7/00C07C7/11C07C11/02
CPCY02P20/584Y02P30/40Y02P30/20
Inventor 胡帅杨卫胜
Owner CHINA PETROLEUM & CHEM CORP
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