Method for producing low-carbon olefin by synthetic gas

A low-carbon olefin and synthesis gas technology, applied in the direction of hydrocarbon production from carbon oxides, chemical instruments and methods, hydrocarbons, etc., can solve the problem of low selectivity of low-carbon olefins, and achieve high reaction space velocity and reaction temperature Easy to control and achieve beneficial effects

Active Publication Date: 2018-03-23
SINOPEC ENG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of method for producing low-carbon olefins from syngas, described method can simultaneously take place Fischer-Tropsch synthesis reaction and cracking reaction, solve the problem of low-carbon olefin selectivity in the prior art, and process The operation flexibility is high, and the product distribution can be reasonably adjusted within a certain range according to the market conditions of ethylene, propylene, and butene. It has the characteristics of simple operation and obvious synergy

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  • Method for producing low-carbon olefin by synthetic gas
  • Method for producing low-carbon olefin by synthetic gas

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Embodiment 1

[0048] The present embodiment provides a kind of bifunctional catalyst of synthesis gas directly producing light olefins, and the weight percent of its each component is: Fe 2 o 3 35%, MnO 6%, K 2 O 4%, Al 2 o 3 20%, ZSM-5 molecular sieve 35%, the silicon-aluminum ratio of ZSM-5 molecular sieve is 300.

[0049] This embodiment also provides a process for directly producing low-carbon olefins from synthesis gas, the flow process of which is as follows figure 1 As shown, the process conditions are as follows: H in the syngas 2 The / CO volume ratio is 2, the reaction temperature is 320°C, the pressure is 0.5MPa, and the total space velocity of the raw material gas is 1000h -1 , the oil phase product C5 + 1 / 2 of the fraction was refined back, and the gas products were separated to obtain light olefins. The reaction results are shown in Table 1.

Embodiment 2

[0051] The present embodiment provides a kind of bifunctional catalyst of synthesis gas directly producing light olefins, and the weight percent of its each component is: Fe 2 o 3 35%, MnO 6%, K 2 O 4%, Al 2 o 3 20%, SPAO-34 molecular sieve 35%, the silicon-aluminum ratio of SPAO-34 molecular sieve is 0.1.

[0052] This embodiment also provides a process for directly producing low-carbon olefins from synthesis gas, the flow process of which is as follows figure 1 As shown, the process conditions are as follows: H in the syngas 2 The / CO volume ratio is 2, the reaction temperature is 320°C, the pressure is 0.5MPa, and the total space velocity of the raw material gas is 1000h -1 , the oil phase product C5 + 1 / 2 of the fraction was refined back, and the gas products were separated to obtain light olefins. The reaction results are shown in Table 1.

Embodiment 3

[0054] The present embodiment provides a kind of bifunctional catalyst of synthesis gas directly producing light olefins, and the weight percent of its each component is: Fe 2 o 3 35%, MnO 6%, K 2 O 4%, Al 2 o 3 20%, ZSM-5 molecular sieve 35%, the silicon-aluminum ratio of ZSM-5 molecular sieve is 100.

[0055] This embodiment also provides a process for directly producing low-carbon olefins from synthesis gas, the flow process of which is as follows figure 1 As shown, the process conditions are as follows: H in the syngas 2 The / CO volume ratio is 3, the reaction temperature is 350°C, the pressure is 1.0MPa, and the total space velocity of the raw material gas is 3000h -1 , the oil phase product C5 + 1 / 2 of the fraction was refined back, and the gas products were separated to obtain light olefins. The reaction results are shown in Table 1.

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Abstract

The invention provides a method for producing low-carbon olefin by synthetic gas. The method comprises the following steps: carrying out Fischer-Tropsch synthesis-cracking reaction on the synthetic gas under the action of a multifunctional catalyst, wherein the reaction temperature is 250 DEG C to 400 DEG C, the reaction pressure is 0 to 5MPa, and the total volume space velocity of raw gas is 1000h<-1> to 10000h<-1>; then separating the low-carbon olefin out from a reaction product. The multifunctional catalyst is mainly prepared from the following components in parts by weight: 10 percent to60 percent of Fe2O3, 0.5 percent to 20 percent of MnO, 0.5 percent to 10 percent of K2O, 10 percent to 30 percent of Al2O3 and the balance of a molecular sieve. According to the method provided by theinvention, Fischer-Tropsch synthesis reaction and cracking reaction can be carried out at the same time; the problem in the prior art that the low-carbon olefin selectivity is low is solved; the technology has high sensitivity and the product distribution can be reasonably adjusted in a certain range according to the market quotations of ethylene, propylene and butylene; the method has the characteristics of simplicity in operation and remarkable synergistic effect.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing low-carbon olefins from syngas. Background technique [0002] Olefins are important chemical raw materials and occupy a very important position in the national economy, while low-carbon olefins such as ethylene, propylene and butene are the basic raw materials for synthetic plastics, fibers and other chemical products. With the development of the chemical industry, the demand for low-carbon olefins is increasing. So far, the way to produce low-carbon olefins such as ethylene and propylene is mainly through the cracking process of light oil. With the increasing depletion of oil resources worldwide, the future energy structure will inevitably shift. Compared with oil resources, coal and natural gas resources are relatively abundant, and it is of great significance to develop low-carbon olefin production processes based on coal and natural gas. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J29/85B01J29/48B01J37/03B01J37/08B01J37/10C07C1/04C07C11/02C07C11/04C07C11/06C07C11/08C07C11/09
CPCB01J23/002B01J29/48B01J29/80B01J29/85B01J37/03B01J37/08B01J37/10B01J2523/00C07C1/044B01J2523/13B01J2523/31B01J2523/72B01J2523/842C07C11/02C07C11/04C07C11/06C07C11/08C07C11/09Y02P20/52
Inventor 毛继平郝代军韩海波秦毓辰张国良陈新宇何文江莉
Owner SINOPEC ENG GRP CO LTD
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