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Method for refining byproduct hydrogen halide gas in halogenated hydrocarbon production process

A technology of production process and refining method, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of short life of the adsorber, long desorption time, high energy consumption, etc., to avoid pollution and corrosion problems, desorption The effect of short time and low energy consumption

Pending Publication Date: 2021-06-11
武汉旭日华环保科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of short life of the adsorber, secondary pollution, heat release, corrosion, long desorption time and high energy consumption easily caused by the above adsorption-water vapor desorption method, the purpose of the present invention is to provide a The purification method of by-product hydrogen halide gas adopts the method of adsorption-electric heating desorption. The whole process does not involve the introduction of any water. Significantly improve production efficiency

Method used

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  • Method for refining byproduct hydrogen halide gas in halogenated hydrocarbon production process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: When benzene is chlorinated at high temperature in a factory to produce chlorinated benzene, the mixed gas produced by the reaction contains by-product HCl gas, benzene and organic by-reaction products, wherein the benzene content is 40 mg / L.

[0023] combine figure 1 As shown, the refining device for by-product hydrogen halide gas in the production process of halogenated hydrocarbons in this embodiment includes a fan 1, a first adsorber 2, a condensation system 3, a second adsorber 4, a solvent storage tank 5, and the first adsorber 2 and the second adsorber 4 are connected in parallel, the mixed gas inlet of the first adsorber 2 and the second adsorber 4 is connected with the mixed gas through the fan 1, and the adsorption outlet of the first adsorber 2 and the second adsorber 4 is connected with the The hydrogen halide gas collector is connected, and the adsorption columns in the first adsorber 2 and the second adsorber 4 are all adsorption columns of acti...

Embodiment 2

[0028] Embodiment 2: During the chlorination reaction process of toluene with chlorine as the chlorine source, the mixed gas produced contains by-product HCl gas, toluene and by-reaction products, wherein the content of toluene is 37 mg / L.

[0029] combine figure 1 As shown, the refining device of the by-product hydrogen halide gas in the halogenated hydrocarbon production process of this embodiment differs from the refining device in Example 1 in that the activated carbon fiber adsorption column in this embodiment is made of viscose-based fiber through A honeycomb activated carbon fiber adsorption column formed by carbonization, activation and processing.

[0030] The refining method of by-product hydrogen chloride gas in the toluene chlorination reaction process, it is finished by above-mentioned refining device, specifically comprises steps:

[0031] 1) Adsorption of organic impurities: collect the mixed gas of hydrogen chloride gas, toluene and organic side reaction produ...

Embodiment 3

[0034] Embodiment 3: In the production process of brominated paraffin and bromochlorinated paraffin, the mixed gas coming out from the reactor is mainly HBr and HCl gas, and a small amount of brominated paraffin and bromochlorinated paraffin.

[0035] combine figure 1 As shown, the refining device of the by-product hydrogen halide gas in the halogenated hydrocarbon production process of this embodiment differs from the refining device in Example 1 in that the activated carbon fiber adsorption column in this embodiment is made of acrylonitrile-based fiber through A paper-like activated carbon fiber adsorption column formed during carbonization, activation and processing.

[0036] The refining method of brominated paraffin and brominated chlorinated paraffin production process by-product HBr and HCl gas, it is realized by above-mentioned refining device, comprises steps:

[0037] 1) Adsorption of organic impurities: In the production process of brominated paraffin and bromochlo...

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Abstract

The invention relates to the technical field of recovery of byproduct gas of organic compounds, and concretely relates to a method forrefining byproduct hydrogen halide gas in a halogenated hydrocarbon production process. The method comprises the following steps: 1) introducing mixed gas containing hydrogen halide gas generated in the halogenated hydrocarbon production process into an adsorber with an adsorption column in the adsorber being an activated carbon fiber adsorption column, adsorbing organic matters in the mixed gas by the activated carbon fiber adsorption column, and collecting pure hydrogen halide gas discharged from an adsorption outlet; 2) loading a power supply at two ends of the activated carbon fiber adsorption column, electrifying, heating and regenerating the activated carbon fiber adsorption column which adsorbs the organic matters, introducing desorption carrier gas into the adsorber, blowing out desorbed organic gas, and cooling to recover the organic matters; and 3) after complete desorption, cooling the adsorber. By adopting an adsorption-electric heating desorption method, the problems of pollution and corrosion of the adsorber caused by the hydrogen halide meeting water can be avoided, the method is simple and efficient, and the production efficiency is obviously improved.

Description

technical field [0001] The invention relates to the technical field of recovery of by-product gases of organic compounds, in particular to an organic compound, such as olefins, alkanes, aromatic hydrocarbons, organic compounds containing sulfur, nitrogen, silicon and other by-products in the process of chlorination, bromination and fluorination The refining method of hydrogen halide. Background technique [0002] The hydrogen halide gas generated during the halogenation reaction of organic compounds is usually absorbed by water or alkali to form a hydrogen halide aqueous solution or salt solution, but the hydrogen halide aqueous solution or salt solution is not refined and purified. The application value of hydrogen gas is high, and the refined and purified hydrogen halide gas can be widely used in chemical synthesis production process in large quantities. [0003] At present, the refining methods of by-product hydrogen halide mainly include: solvent washing method, condens...

Claims

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Application Information

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IPC IPC(8): B01D53/04C01B7/07
CPCB01D53/04C01B7/07B01D2253/102B01D2259/40088B01D2259/4009B01D2257/704B01D2256/26Y02P20/151
Inventor 杨旭东姜艳汪大闪范飞飞杨昕田刚
Owner 武汉旭日华环保科技股份有限公司
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