Recovery method of trichloroethane in sucralose tail gas

A technology of trichloroethane and sucralose, which is applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of difficult recovery and utilization of trichloroethane, and achieves simple methods, strong operational practicability, and high efficiency high effect

Inactive Publication Date: 2019-04-05
ANHUI JINGHE IND
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of difficult recovery and utilization of trichloroethane in the production of the prior art, and provide a method for recovery of trichloroethane in the tail gas of sucralose

Method used

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  • Recovery method of trichloroethane in sucralose tail gas
  • Recovery method of trichloroethane in sucralose tail gas

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Embodiment Construction

[0018] As shown in Table 1, the main equipment used in the present invention is shown in the following table.

[0019]

[0020] The sucralose tail gas first passes through the water washing tower to wash away the HCl contained in the tail gas. The water washing tower is equipped with a circulating water washing device and its connected water washing pump. When the Cl in the water washing tower - When ≥500ppm, concentrated water is extracted.

[0021] The tail gas treated by the washing tower passes through the drying tower to dry the remaining moisture in the tail gas. The drying tower is equipped with a circulating drying system and its connected drying pump. The purity of the concentrated sulfuric acid in the drying system is 92.5%~98%.

[0022] After drying, the exhaust gas enters the shallow cooler from the Roots blower. The inlet pressure of the Roots blower is set to -2KPa during normal operation. When the inlet pressure of the blower shows +1KPa, the Roots blower is started, th...

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Abstract

The invention relates to a treatment method of trichloroethane in sucralose tail gas. The treatment method includes the steps: washing off HCL gas from the sucralose tail gas by a water scrubbing tower; drying remaining water in the tail gas by a drying tower; pressurizing the dried tail gas by a Roots blower to enter a multistage condenser; conveying formed trichloroethane liquid and non-condensable gas into a separation tank; performing further gas-liquid separation to obtain the trichloroethane with the purity of 99%. The condensed tail gas contains the trichloroethane, the condensation temperature of the tail gas is 0-20 DEG C, the trichloroethane enters a recovery storage tank, and the pressure of the recovery storage tank is controlled to be lower than or equal to 30kpa. The treatment method has the advantages that the problem of difficulty in recycling the trichloroethane in the sucralose tail gas is solved, trichloroethane recovery efficiency is high, the method is simple, andoperational practicability is strong.

Description

Technical field [0001] The invention belongs to a method for preparing sucralose in the technical field of chemical industry, and particularly relates to a method for recovering trichloroethane in sucralose tail gas. Background technique [0002] In the production of sucralose, the exhaust gas becomes one of the difficult problems to deal with. One of the harmful substances in the exhaust gas, trichloroethane, is harmful to the environment and has an accumulation effect in groundwater. Bioaccumulation occurs in the food chain important to humans, especially in aquatic organisms. Once inhaled, ingested, absorbed through the skin, etc., acute poisoning mainly damages the central nervous system. Mild cases manifest as headache, dizziness, staggering gait, ataxia, lethargy, etc.; severe cases may have convulsions and even coma. Can cause arrhythmia. It has a mild degreasing and irritation effect on the skin. In humid air, especially under sunlight, the corrosive hydrogen chloride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/05C07C17/38
CPCC07C17/38C07C19/05
Inventor 程光锦陈学楷赵金刚
Owner ANHUI JINGHE IND
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