Device and method for recycling acrylonitrile gas

A recovery device and acrylonitrile technology, 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 fire hazards, so as to prevent secondary pollution and structure Compact, small footprint effect

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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  • Device and method for recycling acrylonitrile gas
  • Device and method for recycling acrylonitrile gas
  • Device and method for recycling acrylonitrile gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: as figure 1 As shown, when the temperature swing pressure swing adsorption device is divided into two groups:

[0043] A recovery device for acrylonitrile gas, comprising a condensation circuit and a temperature-swing pressure-swing adsorption circuit, the condensation circuit comprising a refrigeration compressor 101, a condensation heat exchanger 102, a throttling element, a cold box heat exchanger 105, A gas-liquid separator 107, the gas-liquid separator 107 is connected to the refrigeration compressor 101; the bottom of the cold box heat exchanger 105 is provided with a liquid outlet;

[0044] The inlet of the oil and gas is connected to the inlet of the frequency conversion air pump 201, the outlet of the frequency conversion air pump 201 is connected to the inlet of the first air intake passage of the regenerative heat exchanger 108, and the outlet of the first air intake passage is connected to the outlet of the cold box heat exchanger 105. The inl...

Embodiment 2

[0052] Embodiment 2: The structure is basically the same as that of Embodiment 1, and the similarities are no longer repeated, and the difference is:

[0053] 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 liquid outlets are correspondingly opened at the bottom of the first exchange room and the second exchange room, and each liquid outlet is connected to the heat exchange channel.

[0054] The first exchange room also includes a first refrigerant pipeline parallel to the second ai...

Embodiment 3

[0056] Embodiment 3: the recovery method of the recovery device of the acrylonitrile gas described in embodiment 3 of the present invention, comprises the following steps:

[0057] ① Low-temperature condensation step: including the first low-temperature condensation step and the second low-temperature condensation step:

[0058] The first cryogenic condensation step:

[0059] 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;

[0060] The second low-temperature condensation step: the frequency conversion air pump sends the acrylonitrile gas into the cold box heat...

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PUM

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Abstract

The invention discloses a device and a method for recycling acrylonitrile gas. The device comprises a condensation loop and a temperature-variable and pressure-variable adsorption loop, the condensation loop comprises a cold box heat exchanger, a 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 a 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 acrylonitrile gas recovery device and a recovery method. 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 purpose of the pre...

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
CPCY02P20/50Y02P70/10
Inventor 张林朱志平张贵德孙罡张剑侠
Owner NANJING DOULE REFRIGERATION EQUIP
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