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A kind of tail gas treatment process in bromochlorohydantoin synthesis process

A technology of bromochlorohydantoin and synthesis process, applied in the field of tail gas treatment technology, can solve problems such as being unfavorable to environmental protection, increase production costs and the like, and achieve the effects of being beneficial to environmental protection, improving utilization rate and reducing costs

Active Publication Date: 2020-02-07
河北鑫淘沅医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any one of the above-mentioned bromochlorohydantoin synthesis methods and the synthesis tail gas treatment method containing chlorine are that the synthesis tail gas is directly passed into the environmental protection spray tower, and is emptied after absorbing the chlorine gas with lye, producing a large amount of tail gas absorption waste liquid, which is not Conducive to environmental protection, but also increased production costs

Method used

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  • A kind of tail gas treatment process in bromochlorohydantoin synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The synthesis of bromochlorohydantoin in this example is carried out according to conventional methods. 5,5-Dimethylhydantoin, water, sodium hydroxide, bromine and chlorine are used as raw materials. Firstly, 5,5-dimethylhydantoin and all the sodium hydroxide are dissolved in water according to the preset ratio, the temperature is controlled, bromine is added dropwise, and chlorine gas is introduced to carry out bromination and chlorination reactions. The halogenated product is centrifuged, washed with water, and dried to obtain bromochlorohydantoin.

[0040] The synthetic method of preparing bromochlorohydantoin in step (1) is,

[0041] Dissolve 5,5-dimethylhydantoin and sodium hydroxide in water according to the conventional ratio, and use bromine and chlorine as halogenating agents to carry out bromination and chlorination reactions;

[0042] The tail gas absorbing liquid is added 5,5-dimethylhydantoin, sodium hydroxide and water according to the synthetic ratio; ...

Embodiment 2

[0054] The synthesis of bromochlorohydantoin in this embodiment is carried out according to conventional methods. 5,5-Dimethylhydantoin, water, sodium hydroxide, bromine and chlorine are used as raw materials. The synthesis method for preparing bromochlorohydantoin in step (1) is to dissolve 5,5-dimethylhydantoin and 15-25% of the total weight of the total weight of 5,5-dimethylhydantoin in water according to the conventional ratio, and add While adding bromine and chlorine gas into this solution dropwise, add the remaining aqueous sodium hydroxide solution dropwise;

[0055] The tail gas absorbing liquid is a mixture of 5,5-dimethylhydantoin, water and 15-25% of the total weight of the process ratio prepared according to the synthetic ratio;

[0056] The washing and absorbing liquid is a mixture of water prepared according to the synthetic ratio and 15-25% of the total weight of the technical ratio.

[0057] In step (2), when the synthesis kettle in step (1) completes the s...

Embodiment 3

[0067] The synthesis of bromochlorohydantoin in this embodiment is carried out according to conventional methods. The synthesis method for preparing bromochlorohydantoin in step (1) is to dissolve 5,5-dimethylhydantoin in the mother liquor containing sodium bromide produced during the production of dibromohydantoin according to the conventional ratio, and use chlorine gas as Halogenating agent, while adding dropwise a mass fraction of 30-37% sodium hydroxide solution to carry out bromination and chlorination reactions;

[0068] The tail gas absorbing liquid is 5,5-dimethyl hydantoin prepared according to the synthetic proportion, the mother liquor containing sodium bromide and the hydrogen with a mass fraction of 30-37% of 15-25% of the total weight of the process proportion Sodium oxide solution mixture;

[0069] The rinsing and absorbing liquid is a mixture of water prepared according to the synthetic ratio and a sodium hydroxide solution with a mass fraction of 30-37% of t...

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Abstract

The invention relates to a tail gas treatment process in the synthesis process of bromochlorohydantoin. The tail gas treatment process includes the first step of taking 5,5-dimethylhydantoin as a rawmaterial to prepare bromochlorohydantoin in a synthesis kettle; leading synthesis kettle tail gas into a tail gas absorption kettle, and evacuating the tail gas absorption kettle through an environmental protection absorption tower; wherein tail gas absorption liquid is disposed in the tail gas absorption tank and is aqueous solution of 5,5-dimethylhydantoin and sodium hydroxide or mixed liquid of5,5-dimethylhydantoin and dibromohydantoin mother solution of sodium hydroxide; leaching absorption liquid is disposed in the environmental protection absorption tower and is sodium hydroxide aqueoussolution and a mixture of sodium hydroxide and dibromohydantoin mother solution; the second step of transferring the tail gas absorption liquid in the tail gas absorption kettle into the synthesis kettle after the synthesis kettle is empty, transferring the leaching absorption liquid in the environmental protection absorption tower into the tail gas absorption kettle, and adding 5,5-dimethylhydantoin. According to the tail gas treatment process, the tail gas generated by the synthesis process of bromochlorohydantoin undergoes two-stage absorption by the tail gas absorption kettle and the environmental protection absorption tower and meets the requirements of environmental protection discharge.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a tail gas treatment process in the synthesis process of bromochlorohydantoin. Background technique [0002] Bromochlorohydantoin, full name 1-bromo-3-chloro-5,5-dimethylhydantoin; 1-bromo-3-chloro-5,5-dimethylhydantoin, white or off-white crystal It is a neutral powder with a slight chlorine smell, soluble in benzene, dichloromethane and chloroform, and can be further processed into granules and tablets. Bromochlorohydantoin is a new generation of oxidized disinfectant, which brings together the bactericidal advantages of bromine and chlorine. Compared with other chlorine preparations, it has the characteristics of high stability, low odor, stronger bactericidal effect, slow release, and long-lasting effectiveness. , Can be widely used in: Sterilization and disinfection of swimming pools and drinking water; Water disinfection in aquaculture; Sterilization of industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/82
CPCC07D233/82
Inventor 周保良李伟宪娄献之李爱军赵晓鹏赵晓利李伟光李丽敏陈波
Owner 河北鑫淘沅医药科技有限公司
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