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Rectification process for recycling DMF (dimethyl formamide) in sucralose production

A technology of sucralose and process, applied in the field of rectification process of DMF in the production of recovery of sucralose, can solve the problems such as DMF rectification recovery, reports and the like, and achieve the improvement of DMF recovery rate and the increase of waste water treatment capacity. Effect

Inactive Publication Date: 2016-11-23
ANHUI GUANGXIN AGROCHEM
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art mainly focuses on the separation and purification of chlorination reaction and chlorination products, and there is no report about DMF rectification recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] The rectification process for recovering DMF in the production of sucralose is characterized in that the rectification process includes the following steps: (1) transfer the waste water to the dehydration tower, concentrate and recycle the DMF waste liquid, and separate part of the water to form The crude DMF waste liquid is transferred to the distillation tower connected to the reboiler, and the temperature is controlled to be 120°C. After the liquid boils, part of the water is evaporated and separated, and then discharged into the evaporator through the top of the tower; (2 ) the thick DMF waste liquid in the step 1 is also transferred to the evaporator, and forms heat exchange with the steam separated in the evaporator, and the thick DMF after preheating enters the rectifying tower after cyclone separation, Control the temperature in the rectification tower to 155°C, conduct multiple rectification and purification, and then pass through the condenser, and finally DMF ...

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Abstract

The invention discloses a rectification process for recycling DMF (dimethyl formamide) in sucralose production. The rectification process is characterized by including: (1), transferring waste water into a dehydrating tower, concentrating and recycling DMF waste liquid, separating out part of water to form raw DMF waste liquid, transferring the raw DMF waste liquid into a distillation column connected with a reboiler, separating out part of water through evaporation after liquid boiling, and discharging water vapor into an evaporator via the top of the distillation column; (2), transferring the raw DMF waste liquid in the step (1) into the evaporator, allowing heat exchange between the raw DMF waste liquid and the separated-out water vapor, subjecting the preheated raw DMF waste liquid to cyclone separation, allowing the raw DMF waste liquid to enter a rectifying tower, controlling the internal temperature of the rectifying tower, performing multiple times of rectification and purification, allowing the rectified and purified DMF waste liquid to enter a condenser, and finally, bottling and collecting the DMF in a liquid state. Compared with the prior art, the DMF rectification process has the advantages that both DMF recovery rate and waste water treatment quantity are increased.

Description

technical field [0001] The invention relates to the recovery of DMF, in particular to a rectification process for recovering DMF in the production of sucralose. Background technique [0002] Sucralose is separated by concentration, extraction, crystallization and other separation techniques during the production and preparation process. After the separation, a large amount of residual chlorinated waste liquid is produced. Since these chlorinated waste liquids will cause serious damage to the environment, they must be effectively recovered. Recycling governance. At present, many enterprises use halogenated hydrocarbons as chlorination reagents, and DMF is used as the raw material for generating Vilsmeier reagent. The remaining waste liquid also contains a large amount of residual substances such as halogenated hydrocarbons, DMF, dimethylamine salts, and chloride salts. The prior art mainly focuses on the chlorination reaction and the separation and purification of chlorinate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/03
CPCC07C231/24C07C233/03
Inventor 黄金祥过学军吴建平胡明宏唐修德程伟家李红卫徐小兵高焰兵戴玉婷
Owner ANHUI GUANGXIN AGROCHEM
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