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Cryogenic separation method for dry deacetylation pyrolysis gas

A technology of cryogenic separation and pyrolysis gas, applied in refrigeration and liquefaction, climate sustainability, solidification, etc., can solve the problems of large amount of low-temperature materials, large area, difficult operation, etc., to achieve purification and concentration of hydrogen, The effect of reducing the number of equipment and reducing the difficulty of operation

Active Publication Date: 2022-03-11
北京恒泰洁能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cryogenic separation refrigeration technologies have the disadvantages of large number of equipment, difficult operation, large floor area, large amount of low-temperature materials, and large investment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A cryogenic separation method for dry deykyne cracked gas, specifically:

[0064] 1) The cracked gas enters the mixed refrigerant refrigeration cold box (the mixed refrigerant in the mixed refrigerant refrigeration cold box is a mixture of isopentane, propane, ethylene, methane, and nitrogen in a mass ratio of 7:35:25:26:5) , after cooling down to 15°C, it enters the gas-liquid separation tank of the pyrolysis gas dryer, and the gas phase material on the top of the gas-liquid separation tank of the pyrolysis gas dryer is sent to the pyrolysis gas gas phase dryer, and the liquid phase material enters the pyrolysis gas-liquid phase drying after removing free water device; the pyrolysis gas gas phase dryer and the output material of the cracking gas liquid phase dryer are all sent to the carbon three cutting tower;

[0065] 2) After the gas phase at the top of the C3 cutting tower rises to 3MPa for deacetylation, it is cooled to 30°C with circulating water and sent to the ...

Embodiment 2

[0073] A cryogenic separation method for dry deykyne cracked gas, specifically:

[0074] 1) The cracked gas enters the mixed refrigerant refrigeration cold box (the mixed refrigerant in the mixed refrigerant refrigeration cold box is a mixture of isopentane, propane, ethylene, methane, and nitrogen in a mass ratio of 6:33:30:23:9) , after cooling down to 13°C, it enters the gas-liquid separation tank of the pyrolysis gas dryer, and the gas phase material on the top of the gas-liquid separation tank of the pyrolysis gas dryer is sent to the pyrolysis gas gas phase dryer, and the liquid phase material enters the pyrolysis gas-liquid phase drying after removing free water device; the pyrolysis gas gas phase dryer and the output material of the cracking gas liquid phase dryer are all sent to the carbon three cutting tower;

[0075] 2) After the gas phase at the top of the C3 cutting tower rises to 3MPa for deacetylation, it is cooled to 30°C with circulating water and then sent to...

Embodiment 3

[0083] A cryogenic separation method for dry deykyne cracked gas, specifically:

[0084] 1) The cracked gas enters the mixed refrigerant refrigeration cold box (the mixed refrigerant in the mixed refrigerant refrigeration cold box is a mixture of isopentane, propane, ethylene, methane, and nitrogen in a mass ratio of 9:39:29:20:3) , after cooling down to 14°C, it enters the gas-liquid separation tank of the pyrolysis gas dryer, and the gas phase material on the top of the gas-liquid separation tank of the pyrolysis gas dryer is sent to the pyrolysis gas gas phase dryer, and the liquid phase material enters the pyrolysis gas-liquid phase drying after removing free water device; the pyrolysis gas gas phase dryer and the output material of the cracking gas liquid phase dryer are all sent to the carbon three cutting tower;

[0085] 2) After the gas phase at the top of the C3 cutting tower rises to 4MPa for deacetylation, it is cooled to 30°C with circulating water and then sent to...

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PUM

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Abstract

The invention belongs to the technical field of preparation of olefin from pyrolysis gas in the petrochemical industry, and particularly discloses a cryogenic separation method for dried deacetylated pyrolysis gas. A traditional refrigerating system is replaced by a mixed refrigerating system, cracked gas and purified hydrogen are cooled and condensed step by step through a mixed refrigerant refrigerating box, and the cracked gas is separated through a C3 cutting tower return tank, a C2 cutting tower No.1 feeding separation tank, a C2 cutting tower No.2 feeding separation tank and the like; the propylene refrigerating system is only responsible for tower top condensation of a rectifying tower and reboiling of a tower kettle in an ethylene rectifying tower. According to the invention, the investment of related refrigeration equipment is reduced, the investment cost is greatly saved, the process is simplified, and the operation difficulty and the operation energy consumption of the whole set of device are reduced.

Description

technical field [0001] The invention relates to the technical field of cracking gas to produce olefins in the petrochemical industry, in particular to a cryogenic separation method for dry deykyne cracking gas. Background technique [0002] Ethylene is the most basic and important petrochemical raw material, and the production capacity of ethylene represents the development level of a country's petrochemical industry; in China and even in the world, steam cracking of petroleum products is the main source of ethylene products, although the development of methanol to olefins in China in recent years Soon, but its ethylene production capacity cannot be compared with steam cracking. [0003] As of October 2020, China's ethylene production capacity has reached 31.165 million tons, an increase of 9.2% compared with 2019, and the production capacity has increased by nearly 50% in the past five years; The process is mainly based on the cracking of light hydrocarbons and naphtha. ...

Claims

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Application Information

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IPC IPC(8): F25J3/02
CPCF25J3/0219F25J3/0252Y02P30/40
Inventor 任小坤裴栋中徐晓亮孙立佳李腾刘恩涛徐兴军
Owner 北京恒泰洁能科技有限公司