Process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon mixed aldehyde

A technology of coal-based synthesis gas and low-carbon olefins, which is applied in the direction of hydrocarbon production from carbon oxides, carbon monoxide reaction preparation, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of low mass transfer efficiency in two-phase reactions, Increase the difficulty of phase separation, the separation of phase transfer agents and other issues, to achieve the effect of realizing high-value utilization, solving recycling difficulties, and reducing production energy consumption

Active Publication Date: 2015-04-01
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-soluble rhodium / phosphine complex aims to make the product and the catalyst easy to separate and simplify the process flow, but due to the low mass transfer efficiency of the two-phase reaction, the addition of a phase transfer agent will cause separation problems and may even cause emulsification and increase the difficulty of phase separation

Method used

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  • Process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon mixed aldehyde
  • Process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon mixed aldehyde
  • Process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon mixed aldehyde

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Embodiment 1

[0047] This embodiment provides a process for co-producing low-carbon mixed aldehydes from coal-based syngas to low-carbon olefins, which includes the following steps:

[0048] H in syngas 2 The / CO volume ratio is 2:1. First, it enters the low-carbon olefin synthesis reactor and contacts with the low-carbon olefin synthesis catalyst. -1 Reduction in hydrogen for 6h; the reaction temperature in the synthesis light olefin reactor is 320°C, the pressure is 2.0MPa, and the reaction space velocity is 1000h -1 ; The mol ratio of the constituent elements of the synthetic low carbon olefin catalyst is Fe:Mn:K:Al 2 o 3 =15:8:2:75; The composition of the outlet gas of the synthesis light olefin reactor is shown in Table 1;

[0049] The outlet tail gas can be separated and removed by the separator to remove C 4 And the above hydrocarbons, the remaining synthesis gas and low-carbon hydrocarbons enter the synthesis aldehyde reactor together with the hydroformylation catalyst for conta...

Embodiment 2

[0052] This embodiment provides a process for co-producing low-carbon mixed aldehydes from coal-based syngas to low-carbon olefins, which includes the following steps:

[0053] H in syngas 2 The / CO volume ratio is 1.8:1. First, it enters the low-carbon olefin synthesis reactor and contacts with the low-carbon olefin synthesis catalyst. -1 Reduction in hydrogen for 5h; the reaction temperature in the synthesis light olefin reactor is 350°C, the pressure is 1.5MPa, and the reaction space velocity is 800h -1 , the molar ratio of the constituent elements of the synthetic low-carbon olefin catalyst is Fe:Mn:K:Al 2 o 3 =20:10:10:60, the gas composition at the outlet of the synthesis light olefin reactor is shown in Table 1;

[0054] The outlet tail gas can be separated and removed by the separator to remove C 4 And the above hydrocarbons, the remaining synthesis gas and low-carbon hydrocarbons enter the synthesis aldehyde reactor together with the hydroformylation catalyst for ...

Embodiment 3

[0056] This embodiment provides a process for co-producing low-carbon mixed aldehydes from coal-based syngas to low-carbon olefins, which includes the following steps:

[0057] H in syngas 2 The / CO volume ratio is 2:1. First, it enters the low-carbon olefin synthesis reactor and contacts with the low-carbon olefin catalyst. -1 Reduction in hydrogen for 8h; the reaction temperature in the synthesis light olefin reactor is 350°C, the pressure is 1.5MPa, and the reaction space velocity is 1200h -1 , the molar ratio of the constituent elements of the synthetic low-carbon olefin catalyst is Fe:Mn:K:Al 2 o 3 =28:8:15:49; The gas composition at the outlet of the synthesis light olefin reactor is shown in Table 1;

[0058] The outlet tail gas can be separated and removed by the separator to remove C 4And the above hydrocarbons, the remaining synthesis gas and low-carbon hydrocarbons enter the synthesis aldehyde reactor and contact with the hydroformylation catalyst. The reaction ...

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Abstract

The invention provides a process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon mixed aldehyde. The process comprises the following steps: carrying out contact reaction on a coal-based synthesis gas and a catalyst for light olefin synthesis, then carrying out contact reaction on a tail gas and a hydroformylation catalyst and synthesizing to obtain mixed propionaldehyde and butyraldehyde. The synthesis gas contained in the reaction product tail gas obtained in the preparation of light olefin from the coal-based synthesis gas in the process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon aldehyde, which is provided by the invention, and light olefin almost just meet the raw material ratio required in preparation of aldehyde by hydroformylation, so that the resources can be fully utilized and the flow can be simplified. By the process provided by the invention, the co-production of light olefin and low-carbon mixed aldehyde can be well achieved.

Description

technical field [0001] The invention relates to a process for producing low-carbon olefins from coal-based synthesis gas and co-producing low-carbon mixed aldehydes, which belongs to the field of fine petrochemical industry. Background technique [0002] In recent years, China's coal chemical industry has developed rapidly, especially coal gasification to synthesis gas, and the production of methanol, methane and low-carbon olefins from synthesis gas has developed rapidly. However, the process route is long, and the investment and operation costs are relatively high. Benefits need to be improved. [0003] The direct production of low-carbon olefins from syngas refers to syngas (CO and H 2 ) The process of preparing olefins with carbon number less than or equal to 4 through Fischer-Tropsch synthesis under the action of a catalyst. Compared with coal-based synthesis gas through methanol to olefins route, synthesis gas directly produces low-carbon olefins, avoiding the synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/04C07C9/04C07C11/02C07C9/02C07C45/50C07C47/02B01J31/28
Inventor 姜伟丽余长春周红军罗聃
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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