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Product separation and byproduct utilization method and product separation and byproduct utilization device for preparing olefin from synthesis gas

A synthesis gas and product technology, applied in the purification/separation of hydrocarbons, chemical instruments and methods, distillation purification/separation, etc., can solve the problems of by-product utilization, low conversion rate, carbon monoxide removal and low efficiency of hydrogen equipment, and achieve The effect of increasing the benefit of the unit, increasing the yield of diene products, and reducing the unit consumption of the unit

Pending Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The invention relates to a method and device for product separation and by-product utilization of olefins from synthesis gas, mainly solving the problem of low conversion rate in the reaction process of preparation of olefins from synthesis gas, resulting in a large amount of unconverted synthesis gas in the product gas affecting the subsequent separation process and the existing separation process. The problem of low efficiency of carbon monoxide and hydrogen removal equipment and the utilization of by-products in the technology can be used in the separation process of syngas to produce olefin products, with high equipment efficiency, high product recovery rate, high product purity, low energy consumption in the separation process, and utilization of by-products good advantage

Method used

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  • Product separation and byproduct utilization method and product separation and byproduct utilization device for preparing olefin from synthesis gas
  • Product separation and byproduct utilization method and product separation and byproduct utilization device for preparing olefin from synthesis gas
  • Product separation and byproduct utilization method and product separation and byproduct utilization device for preparing olefin from synthesis gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0183] The product stream obtained in the reaction zone contains: 25.00% carbon dioxide, 3.40% hydrogen, 46.40% carbon monoxide, 15.70% mixed hydrocarbons, using figure 2 In the technical scheme, methyldiethanolamine is used as an absorbent in the decarbonization zone, pressure swing adsorption separation method is used in the dehydrogenation zone, 76% of the recycle stream is returned to the synthesis gas preparation olefin reactor, and ethylene products and propylene products are obtained by separation.

[0184] The temperature of the low-temperature mixed hydrocarbon stream is minus 105°C and the pressure is 3.5MPaG.

[0185] The carbon dioxide removal rate is 98.64%, the carbon monoxide recovery rate is 98.98%, the hydrogen recovery rate is 98.18%, the ethylene product yield is 2.63% higher than the comparative technical solution, the recovery rate is 97.3%, and the propylene product yield is 2.68% higher than the comparative technical solution , the recovery rate is 99.8...

Embodiment 2

[0187] The product stream obtained in the reaction zone contains: 25.00% carbon dioxide, 3.40% hydrogen, 46.40% carbon monoxide, 15.70% mixed hydrocarbons, using figure 2 In the technical scheme, methyldiethanolamine is used as an absorbent in the decarbonization zone, pressure swing adsorption separation method is used in the dehydrogenation zone, 86% of the recycle stream is returned to the synthesis gas preparation olefin reactor, and ethylene products and propylene products are obtained by separation.

[0188] The temperature of the low-temperature mixed hydrocarbon stream is minus 110°C and the pressure is 3.4MPaG.

[0189] The carbon dioxide removal rate is 98.63%, the carbon monoxide recovery rate is 98.97%, the hydrogen recovery rate is 98.17%, the ethylene product yield is 2.97% higher than the comparative technical solution, the recovery rate is 97.4%, and the propylene product yield is 3.03% higher than the comparative technical solution , the recovery rate is 99.8...

Embodiment 3

[0191] The product stream obtained in the reaction zone contains: 25.00% carbon dioxide, 3.40% hydrogen, 46.40% carbon monoxide, 15.70% mixed hydrocarbons, using figure 2 In the technical scheme, methyldiethanolamine is used as an absorbent in the decarbonization zone, pressure swing adsorption separation method is used in the dehydrogenation zone, 96% of the recycle stream is returned to the synthesis gas preparation olefin reactor, and ethylene products and propylene products are obtained by separation.

[0192] The temperature of the low-temperature mixed hydrocarbon stream is minus 115°C and the pressure is 3.3MPaG.

[0193] The carbon dioxide removal rate is 98.62%, the carbon monoxide recovery rate is 98.96%, the hydrogen recovery rate is 98.16%, the ethylene product yield is 3.32% higher than the comparative technical solution, the recovery rate is 97.5%, and the propylene product yield is 3.38% higher than the comparative technical solution , the recovery rate is 99.9...

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Abstract

The invention relates to a product separation and byproduct utilization method and a product separation and byproduct utilization device for preparing olefin from synthesis gas. A purpose of the invention is mainly to solve the problems of influence on the subsequent separation process by a large amount of unconverted synthesis gas contained in product gas due to low conversion rate in a reactionprocess for preparing olefin from synthesis gas, and low efficiency of carbon monoxide and hydrogen removal equipment and byproduct utilization in the existing separation technology in the prior art.According to the technical scheme, the method comprises the following steps: separating a product gas stream into a carbon dioxide stream and a carbon removal stream through a carbon removal zone; separating the carbon removal stream into a stream mainly containing C2 and below and a stream containing C3 and above through an ethane removal tower; feeding the stream containing C3 and above into a propylene product separation zone; and separating to obtain a propylene product stream, a propane stream and a C4 and above component stream. By adopting the technical scheme, the problems are well solved, and the method and the device can be used for the separation process for preparing olefin products from synthesis gas, and have the advantages of high equipment efficiency, high product recoveryrate, high product purity, low energy consumption in the separation process and good byproduct utilization.

Description

technical field [0001] The invention relates to a method and device for product separation and by-product utilization of olefins prepared from synthesis gas, in particular to a method and device for separation and by-product utilization of olefins prepared from synthesis gas in one step. [0002] technical background [0003] Olefins, especially ethylene, propylene and butene, are important basic chemical raw materials, and their demand has been increasing in recent years. Generally, olefins mainly come from petroleum processing. With the increasing shortage of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase, and the development of technologies for producing olefins from non-petroleum resources such as coal or natural gas has attracted more and more attention at home and abroad. The method of producing low-carbon olefins from coal and natural gas is usually to convert coal and natural gas into synthesis gas, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C11/06C07C7/11C07C7/12C07C7/04
CPCC07C7/11C07C7/12C07C7/04C07C7/005C07C11/04C07C11/06
Inventor 胡帅杨卫胜胡松
Owner CHINA PETROLEUM & CHEM CORP
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