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A low-energy recovery process for chlorinated organic compounds in mixed gas containing chlorinated organic compounds

An organic, low-energy technology, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve problems such as chlorinated organic pollution, low temperature operation, and difficult separation

Active Publication Date: 2021-10-22
天吉人吉环保节能(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101596396A "A Method for Deeply Drying Gas" discloses the method of using multi-layer segmented adsorbents to dry the gas. However, when the regeneration temperature is higher than 90°C, the high-concentration unsaturated chlorinated organic gas undergoes a self-polymerization reaction. Therefore, The invention cannot be used for adsorption separation of unsaturated chlorinated organic gases
[0004] There are two ways to use a vacuum system to desorb chlorinated organic compounds. One is a mechanical vacuum pump. Since the outlet temperature of this pump is higher than 90°C, it is easy to cause self-polymerization of chlorinated organic compounds, so it cannot be used.
The other is a water ring or oil ring vacuum pump, which operates at a low temperature, but water or oil pollutes chlorinated organics and is not easy to separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1: The composition of a certain vinyl chloride mixed gas is as follows.

[0007] (1) Raw material gas composition:

[0008] Element Nitrogen vinyl chloride Argon Acetylene V / V 0.1166 0.7064 0.077 0.1

[0009] (2) Raw material gas volume: 700Nm 3 / H;

[0010] (3) Pressure: ~0.4Mpa (gauge pressure);

[0011] (4) Temperature: ~40°C.

[0012] Under the above working conditions, the temperature of the mixed gas of vinyl chloride is lowered to -25°C first, the vinyl chloride is liquefied and separated, and then the mixed gas with 90% of the separated vinyl chloride is directly sent to one of the three adsorption towers of 3 cubic meters. At the outlet of the tower, we get waste gas with vinyl chloride content ≤ 10ppb, which is directly sent to the subsequent process.

[0013] The upper part of the adsorption bed adopts tubular type, the lower part adopts empty tower type, the upper part is filled with 13X molecular sieve which is ...

Embodiment 2

[0016] Embodiment 2: The composition of a certain chloromethane mixed gas is as follows.

[0017] (1) Raw material gas composition:

[0018] Element Nitrogen vinyl chloride Argon Chloromethane V / V 0.666 0.008 0.007 0.319

[0019] (2) Raw material gas volume: 700Nm 3 / H;

[0020] (3) Pressure: ~0.4Mpa (gauge pressure);

[0021] (4) Temperature: ~40°C.

[0022] Under the above working conditions, the temperature of the mixed gas of methyl chloride is lowered to -10°C, liquefied and separated from vinyl chloride, and then the mixed gas with 90% of the separated methyl chloride is directly sent to one of the three adsorption towers of 3 cubic meters. At the outlet of the tower, we get waste gas with a total chlorinated organic content of ≤10ppb, which is directly sent to the subsequent process.

[0023] The upper part of the adsorption bed adopts tubular type, the lower part adopts empty tower type, the upper part is filled with 13X molecular sie...

Embodiment 3

[0026] Embodiment 3: The composition of a certain chloropropane mixed gas is as follows.

[0027] (1) Raw material gas composition:

[0028] Element Nitrogen Chloromethane Argon Chloropropane V / V 0.57 0.301 0.01 0.109

[0029] (2) Raw material gas volume: 700Nm 3 / H;

[0030] (3) Pressure: ~0.4Mpa (gauge pressure);

[0031] (4) Temperature: ~40°C.

[0032] Under the above working conditions, the temperature of the mixed gas of chlorinated organic matter is first lowered to -5°C, the chloropropane is liquefied and separated, and then the mixed gas from which 88% of the chloropropane has been separated is directly sent to one of the three adsorption towers of 3 cubic meters. At the outlet of the adsorption tower, we get waste gas with organic chlorine content ≤ 10ppb, which is directly sent to the subsequent process.

[0033] The upper part of the adsorption bed adopts tubular type, the lower part adopts empty tower type, the upper part is fill...

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PUM

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Abstract

The invention relates to a process for recovering organic matter with low energy consumption of mixed gas containing chlorinated organic matter. The raw material gas is frozen to a state where ≤90% of chlorinated organic matter can be liquefied and separated, and the unliquefied saturated gas of chlorinated organic matter is sent to the established At least one of the three or more adsorption tower groups can completely absorb and separate chlorinated organic substances from the gas, and the concentration of chlorinated organic substances in the exhaust gas should be below 10ppb; after a certain period of time, the adsorption tower that has adsorbed chlorinated organic substances can be switched. The other adsorption towers continue to separate organic chlorides. The adsorption towers that have completed the adsorption are desorbed by depressurization, vacuuming, and temperature rise. low energy consumption and full recovery.

Description

technical field [0001] The invention relates to the fields of chemical industry and environmental protection, and is a method for effectively reducing the environmental pollution of chlorinated organic gases and reducing the energy required for the recovery of chlorinated organic substances. Background technique [0002] For the recovery method of gas containing chlorinated organic compounds, the commonly used method is to freeze and liquefy recovery after compression, and the saturated vapor pressure of chlorinated organic compounds remains unchanged under high pressure, thereby realizing the separation of liquefied chlorinated organic compounds. When the concentration of chlorinated organic matter reaches below 10ppb, it is required that the liquefaction temperature should be below -160°C under 4.0MPa, which results in high energy consumption and poor economic benefits. [0003] The use of temperature swing adsorption to remove moisture in the air is a common method with l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01D53/00
CPCB01D53/002B01D53/0423B01D53/0438B01D2253/102B01D2253/116B01D2257/206B01D2259/40092
Inventor 杨皓宁平曲思霖
Owner 天吉人吉环保节能(苏州)有限公司