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Phosgenation reaction tail gas treatment method

A treatment method, phosgenation technology, applied in the direction of gas treatment, chemical instruments and methods, separation methods, etc., can solve problems such as human injury, catalyst activity impact, environmental pollution, etc., to avoid resource waste, realize reuse, obvious The effect of economic benefits

Active Publication Date: 2020-05-08
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The direct discharge of the tail gas in the phosgenation reaction will pollute the environment. The components of the tail gas in the phosgenation reaction are mainly composed of chlorine gas, phosgene, hydrogen chloride gas and carbon dioxide, among which chlorine gas, phosgene and hydrogen chloride gas will cause harm to the human body. damage, so it is necessary to treat the tail gas. The existing treatment methods are all through catalyst spraying. Although it can achieve a certain effect, when the chlorine content in the phosgenation tail gas is high, it will affect the catalyst. The processing ability of the catalyst will drop sharply, resulting in poor treatment effect on phosgene. At the same time, some organic solvents in the tail gas will also affect the activity of the catalyst, making the treatment effect on tail gas poor.

Method used

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  • Phosgenation reaction tail gas treatment method
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  • Phosgenation reaction tail gas treatment method

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Experimental program
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Effect test

Embodiment 1

[0028] see figure 1 , the invention provides a technical scheme of a treatment method for phosgenation reaction tail gas: comprising the following steps:

[0029] S1, pass the light reaction tail gas into the spray absorption tower with solvent A as absorbent, solvent A is benzene, silicon tetrachloride, nonane, sulfur monochloride, carbon tetrachloride, chlorosulfonic acid, tetrachloride One of carbon, silicon tetrachloride, and n-dodecane, the solvent A can be selected according to actual needs and cost considerations, absorb the chlorine in the mixed tail gas in the liquid phase, separate from the phosgene in the gas phase, and absorb The saturated solvent A is then desorbed to obtain separated chlorine gas, and the saturated solvent A is heated to desorb the chlorine gas and then recycled. The desorption temperature is 50-80 °C; the obtained chlorine gas is prepared by absorbing a NaOH aqueous solution with a concentration of 6-15 wt%. sodium hypochlorite;

[0030] S2, p...

Embodiment 2

[0036] see figure 1 , the invention provides a technical scheme of a treatment method for phosgenation reaction tail gas: comprising the following steps:

[0037] S1, pass the light reaction tail gas into the spray absorption tower with solvent A as absorbent, solvent A is benzene, silicon tetrachloride, nonane, sulfur monochloride, carbon tetrachloride, chlorosulfonic acid, tetrachloride One of carbon, silicon tetrachloride, and n-dodecane, the solvent A can be selected according to actual needs and cost considerations, absorb the chlorine in the mixed tail gas in the liquid phase, separate from the phosgene in the gas phase, and absorb The saturated solvent A is then desorbed to obtain separated chlorine gas, and the saturated solvent A is heated to desorb the chlorine gas and then recycled. The desorption temperature is 50-80 °C; the obtained chlorine gas is prepared by absorbing a NaOH aqueous solution with a concentration of 6-15 wt%. sodium hypochlorite;

[0038] S2, p...

Embodiment 3

[0044] see figure 1 , the invention provides a technical scheme of a treatment method for phosgenation reaction tail gas: comprising the following steps:

[0045] S1, pass the light reaction tail gas into the spray absorption tower with solvent A as absorbent, solvent A is benzene, silicon tetrachloride, nonane, sulfur monochloride, carbon tetrachloride, chlorosulfonic acid, tetrachloride One of carbon, silicon tetrachloride, and n-dodecane, the solvent A can be selected according to actual needs and cost considerations, absorb the chlorine in the mixed tail gas in the liquid phase, separate from the phosgene in the gas phase, and absorb The saturated solvent A is then desorbed to obtain separated chlorine gas, and the saturated solvent A is heated to desorb the chlorine gas and then recycled. The desorption temperature is 50-80 °C; the obtained chlorine gas is prepared by absorbing a NaOH aqueous solution with a concentration of 6-15 wt%. sodium hypochlorite;

[0046] S2, p...

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Abstract

The invention discloses a phosgenation reaction tail gas treatment method which comprises the following steps: introducing phosgenation reaction tail gas into a spray absorption tower with a solvent Aas an absorbent, absorbing chlorine in the tail gas into a liquid phase, and desorbing the saturated solvent A to obtain separated chlorine; introducing the residual tail gas into a condensing tower,and recovering the organic solvent in the tail gas; introducing the residual tail gas into a spray absorption tower with a solvent B as an absorbent, absorbing hydrogen chloride in the tail gas intoa liquid phase, and desorbing the saturated solvent B to obtain separated hydrogen chloride gas; introducing the residual tail gas into a spray absorption tower taking a catalyst C as an absorbent, and hydrolyzing the surface of the wetted catalyst into hydrogen chloride and carbon dioxide gas. According to the treatment method, chlorine in the tail gas is absorbed firstly, then an organic solventin the tail gas is treated, so that the use of a catalyst is prevented from being influenced; and then hydrogen chloride in the tail gas is treated and finally phosgene is treated, so that the tail gas treatment effect is good.

Description

technical field [0001] The invention relates to the technical field of phosgenation reaction tail gas treatment, in particular to a treatment method for phosgenation reaction tail gas. Background technique [0002] Phosgene (chemical formula: COCl 2 ), the common name of carbonyl chloride, also known as carbon oxychloride, carbonyl chloride, chloroformyl chloride, etc., is the abbreviation of "photogenic gas". Translated from English phosgene (generated by phos light + gen). Phosgene was originally produced by the decomposition of chloroform by light, hence the name. Phosgene is a diacyl chloride derivative of carbonic acid in terms of chemical structure, and is a very active electrophile. Phosgene is a colorless and highly toxic gas. It is a colorless or slightly yellow gas (industrial products are usually liquefied light yellow liquid). When concentrated, it has a strong pungent or suffocating odor. Slightly soluble in water and gradually hydrolyzed, soluble in aromati...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/78B01D53/68B01D53/70
CPCB01D53/1406B01D53/18B01D53/1456B01D53/1418B01D53/1425B01D53/8662B01D53/78B01D53/68B01D2257/2025B01D2257/2045B01D2257/2064
Inventor 吴玉明沈德第沈丽娜
Owner NJTECH ENVIRONMENT TECH CO LTD
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