Method for preparing low-carbon olefin from synthesis gas

A low-carbon olefin and synthesis gas technology, which is applied in the field of co-production of gasoline and synthesis gas to produce low-carbon olefins, can solve the problems of large energy consumption, low selectivity of low-carbon olefins, low catalyst activity, etc., and achieve high conversion rate and methane The effect of low selectivity and simple separation process

Pending Publication Date: 2020-05-29
大连凯信科技研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems of low selectivity of low-carbon olefins and low catalyst activity, and in the secondary reactor, hydrogen and carbon monoxid

Method used

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  • Method for preparing low-carbon olefin from synthesis gas
  • Method for preparing low-carbon olefin from synthesis gas
  • Method for preparing low-carbon olefin from synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0052] Example 1

[0053] Use as figure 1 In the described process, the embodiment verification process uses a fluidized bed reactor for the high temperature Fischer-Tropsch reaction process, and a fixed bed reactor for the catalytic cracking reaction process.

[0054] High temperature Fischer-Tropsch reaction conditions: H 2 / CO=1 / 1 (molar ratio, the same below), reaction temperature 340℃, reaction pressure 2MPa, catalyst load (reaction actual volumetric space velocity) 8000h -1 , 80% carbon monoxide, hydrogen recycle stream ( figure 1 China Logistics 7) Circulate back to the high temperature Fischer-Tropsch reaction zone.

[0055] High temperature Fischer-Tropsch uses catalyst as Fe 100 Zn 35 Cr 15 Mg 60 Al 120 Na 3 O x .

[0056] Catalytic cracking reaction conditions: reaction temperature 500℃, reaction pressure, 0.1MPa, catalyst load (actual mass space velocity of reaction) 20h -1 , The recycle stream of 80% carbon five or more aromatic-rich oil is recycled back to the catalytic...

Example Embodiment

[0061] Example 2

[0062] Use as figure 1 In the described process, the embodiment verification process uses a fluidized bed reactor for the high temperature Fischer-Tropsch reaction process, and a fixed bed reactor for the catalytic cracking reaction process.

[0063] High temperature Fischer-Tropsch reaction conditions: H 2 / CO=1.5 / 1, reaction temperature 320℃, reaction pressure 1.5MPa, catalyst load (actual volumetric space velocity of reaction) 4000h -1 , 90% carbon monoxide and hydrogen recycle stream is recycled back to the high temperature Fischer-Tropsch reaction zone.

[0064] High temperature Fischer-Tropsch uses catalyst as Fe 100 Zn 50 Cr 12 Mg 30 Al 90 Na 8 O x .

[0065] Catalytic cracking reaction conditions: reaction temperature 600℃, reaction pressure, 0.5MPa, catalyst load (actual mass space velocity of reaction) 30h -1 , The recycle stream of 90% carbon five or more aromatic-rich oil is recycled back to the catalytic cracking reaction zone.

[0066] The catalyst used...

Example Embodiment

[0070] Example 3

[0071] Use as figure 1 In the described process, the embodiment verification process uses a fluidized bed reactor for the high temperature Fischer-Tropsch reaction process, and a fixed bed reactor for the catalytic cracking reaction process.

[0072] High temperature Fischer-Tropsch reaction conditions: H 2 / CO=1.5 / 1, reaction temperature 350℃, reaction pressure 2.5MPa, catalyst load (actual volumetric space velocity of reaction) 20000h -1 , The 100% carbon monoxide and hydrogen recycle stream is recycled back to the high temperature Fischer-Tropsch reaction zone.

[0073] High temperature Fischer-Tropsch uses catalyst as Fe 100 Mn 75 Cr 15 Mg 60 Al 120 K 3 O x .

[0074] Catalytic cracking reaction conditions: reaction temperature 550℃, reaction pressure, 0.3MPa, catalyst load (reaction actual mass space velocity) 30h -1 , The recycle stream of 100% C5 or higher aromatic-rich oil is recycled back to the catalytic cracking reaction zone.

[0075] The catalyst used in...

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Abstract

The invention discloses a method for preparing olefin from synthesis gas. The method comprises the following steps: (1) reacting the synthesis gas through a catalyst by a high-temperature Fischer-Tropsch method to obtain an olefin-containing material flow; (2) condensing the olefin-containing material flow in the step (1), and carrying out gas-liquid separation to obtain a high-carbon olefin-containing material flow and a low-carbon olefin-containing material flow; (3) removing CO2, CO and H2 from the low-carbon olefin-containing material flow in the step (2) through decarburization and dehydrogenation treatment to obtain low-carbon olefin, and enabling the removed CO and H2 to flow back to the high-temperature Fischer-Tropsch reaction; (4) carrying out catalytic cracking reaction on the high-carbon olefin-containing material flow obtained in the step (2) through a catalyst to obtain a low-carbon olefin material flow and an aromatic hydrocarbon-containing material flow; and (5) carrying out olefin separation on the low-carbon olefin material flows in the step (3) and the step (4) to obtain low-carbon olefin. According to the method, the CO conversion rate reaches 90% or above, thelow-carbon olefin selectivity reaches 50% or above and can reach 75%, and 10-20% high aromatic hydrocarbon gasoline can be obtained.

Description

technical field [0001] The invention relates to a method for producing olefins from synthesis gas, in particular to a method for producing low-carbon olefins from synthesis gas, which can also co-produce gasoline. Background technique [0002] Low-carbon olefins such as ethylene, propylene, and butene are important basic chemical raw materials and occupy an important position in the national economy. These low-carbon olefins are the basic raw materials for various chemical products such as synthetic plastics and fibers. At present, the industrial production method of olefins is mainly based on petroleum-based derivatives as raw materials, such as steam cracking of naphtha to produce light olefins. [0003] In recent years, with the increasing scarcity of my country's oil resources and the continuous growth of oil demand, my country's dependence on foreign crude oil has continued to increase. Different from crude oil, my country's coal resources are very rich, and the synthe...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C11/08C07C1/04C07C4/06C07C7/00C10L1/04
CPCC07C1/048C07C1/044C07C4/06C07C7/00C10L1/04C07C2523/86C07C2523/889C07C11/04C07C11/06C07C11/08Y02P20/52Y02P30/20Y02P30/40
Inventor 周军成刘家旭王甦
Owner 大连凯信科技研发有限公司
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