Adsorption recycling device and method for acrylonitrile gas

A technology for adsorption and recovery of acrylonitrile, applied in separation methods, chemical instruments and methods, steam condensation, etc., can solve the problems of acrylonitrile gas polluting the environment, endangering the health of employees, and resource loss, so as to prevent secondary pollution and structure Compact, fast effects

Active Publication Date: 2015-08-12
NANJING DOULE REFRIGERATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Because acrylonitrile volatile organic compounds are very easy to volatilize in the process of production, storage, transportation, sales, use, etc., resulting in a very serious fixed emission source of acrylonitrile gas, which not only causes resource loss, but also constitutes a potential fire hazard and is toxic. Acrylonitrile gas seriously pollutes the environment and endangers the health of workers
[0003] So far, there is no mature acrylonitrile recovery device on the market that can meet the emission standards of acrylonitrile gas in petrochemical plants, storage depots, and transfer warehouses, without causing secondary pollution.

Method used

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  • Adsorption recycling device and method for acrylonitrile gas
  • Adsorption recycling device and method for acrylonitrile gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: as figure 1An adsorption and recovery device for acrylonitrile gas is shown, which includes a condensation circuit and a temperature-swing pressure-swing adsorption circuit. The condensation circuit includes an explosion-proof refrigeration compressor 101, a condensation heat exchanger 102, a throttling element, and a cold box exchange unit connected in sequence. Heater 105, gas-liquid separator 107, the gas-liquid separator 107 is connected to the explosion-proof refrigeration compressor 101; the bottom of the cold box heat exchanger 105 is provided with a liquid outlet;

[0035] The inlet of the oil and gas is connected to the inlet of the frequency conversion air pump 201 through the second flame arrester, and the outlet of the frequency conversion air pump 201 is connected to the inlet of the first air intake passage of the recuperator heat exchanger 108 through the first flame arrester 202, and the first air intake The outlet of the channel is connect...

Embodiment 2

[0040] Embodiment 2: The structure is basically the same as that of Embodiment 1, and the similarities are no longer repeated, and the difference is:

[0041] The cold box heat exchanger 105 is provided side by side with a first exchange room and a second exchange room, and the first exchange room includes a gas passage inlet, a gas passage outlet, a second air intake passage arranged in parallel in the longitudinal direction, and a second Return air channel; the second exchange chamber includes a third air intake channel and a third air return channel arranged in parallel longitudinally; The second air return channel and the outlet of the gas channel are connected to form a heat exchange channel; the bottom of the first exchange room and the second exchange room are correspondingly opened with liquid outlets connected to the heat exchange channel, and each liquid outlet is provided with There is an on-off valve.

[0042] The first exchange room also includes a first refriger...

Embodiment 3

[0043] Embodiment 3: the recovery method of the adsorption recovery device of described acrylonitrile gas, comprises the following steps:

[0044] ① Low-temperature condensation step: including the first low-temperature condensation step and the second low-temperature condensation step:

[0045] The first cryogenic condensation step:

[0046] The frequency conversion air pump sends the acrylonitrile gas into the cold box heat exchanger through the heat recovery heat exchanger, and the acrylonitrile gas is condensed in the cold box heat exchanger through the circulation cooling of the condensation circuit, and then the acrylonitrile gas is condensed through the switching of the three-way switching valve. , the condensed low-temperature acrylonitrile gas directly enters the anti-liquid sprinkler irrigation;

[0047] The second low-temperature condensation step: the frequency conversion air pump sends the acrylonitrile gas into the cold box heat exchanger through the heat exchan...

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PUM

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Abstract

The invention discloses an adsorption recycling device and method for acrylonitrile gas. The adsorption recycling device comprises a condensation loop and a temperature-variable and pressure-variable adsorption loop, the condensation loop comprises a cold box heat exchanger, an antiexplosion refrigerating compressor, a throttling element, a condensing heat exchanger and a gas-liquid separator, and the temperature-variable and pressure-variable adsorption loop comprises a frequency-variable air pump, a return heat exchanger, a three-way switching valve, a cold box heat exchanger, a liquid-gush-preventive tank, a temperature-variable and pressure-variable adsorption device and an antiexplosion vacuum pump. Acrylonitrile gas is recycled and purified through the condensation loop and the temperature-variable and pressure-variable adsorption loop, concentration of acrylonitrile gas reaches milligram grade finally, and secondary pollution when a unit runs is eradicated completely.

Description

technical field [0001] The invention relates to a gas recovery device, in particular to an adsorption recovery device and recovery method for acrylonitrile gas. Background technique [0002] Because acrylonitrile volatile organic compounds are very easy to volatilize in the process of production, storage, transportation, sales, use, etc., resulting in a very serious fixed emission source of acrylonitrile gas, which not only causes resource loss, but also constitutes a potential fire hazard and is toxic. Acrylonitrile gas seriously pollutes the environment and endangers the health of workers. [0003] So far, there is no mature acrylonitrile recovery device on the market that can meet the emission standards of acrylonitrile gas in places such as petrochemical plants, storage depots and transfer warehouses, without causing secondary pollution. Contents of the invention [0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the first purpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/047B01D5/00C07C255/08C07C253/34
Inventor 张林朱志平张贵德孙罡张剑侠
Owner NANJING DOULE REFRIGERATION EQUIP
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