Device and method for separating sucralose exhaust

Abstract

The invention relates to a device and a method for separating sucralose exhaust. A liquid ring pump compresses to 0.1MPa so as to enable an air flow to enter a solvent tower T101, and trichloroethane and DMF are concentrated at the bottom of the tower, and a recycling process is started; SO2, HCl and air are concentrated at the top of the tower; and a compressor compresses to 2.0MPa so as to enable discharged materials to enter a refining tower T102, the material exchange is conducted in the tower, HCl and air are concentrated at the top of the tower, the compressor compresses to 5.0MPa so as to enable HCl and air to enter a filling air cylinder, and SO2 is concentrated at the bottom of the tower and is introduced into an air cylinder through a filling mouth. The beneficial effects are as follows: most adopted equipment runs under a higher pressure state, and no reaction kettle is used; and the products are separated HCl and SO2 that are contained in vessels separate, and in the production of sucralose, a trace amount of trichloroethane and DMF solvent that are mixed can be concentrated and recycled exclusively.

Description

technical field [0001] The invention relates to a device and method for treating sucralose tail gas, in particular to a device and method for separating sucralose tail gas. Background technique [0002] The chlorination process in the production process of sucralose produces a large amount of hydrogen chloride and sulfur dioxide tail gas, and contains a small amount of DMF and trichloroethane solvent. The traditional absorption process of these gases is alkaline water absorption, and the consumption of liquid alkali and operating costs are very large. , the absorption process is more likely to pollute the environment, and the purity of the product hydrochloric acid and sodium sulfite is not high. [0003] The Chinese patent document publication number is CN103113197A, which was also applied by our company before. The patent name is "A Method for Comprehensive Utilization of Sucralose Production Waste Gas", which includes the following production steps: first, the hydrogen ch...

AI Technical Summary

Problems solved by technology

[0002] The chlorination process in the production process of sucralose produces a large amount of hydrogen chloride and sulfur dioxide tail gas, and contains a small amount of DMF and trichloroethane solvent. The traditional absorption process of these gases is alkaline water absorption, and the consumption of liquid alkali and operating costs are very large. , the absorption process is relatively easy to pollute the environment, and the purity of the product hydrochloric acid and sodium sulfite is not high

[0005] In addition, there are still problems: the above-mentioned invention patent realizes the low-temperature liquefaction and separation of sulfur dioxide. Hydrogen chloride is used as a catalyst to catalyze the reaction of acetonitrile and alcohols to form trimethyl orthoacetate. However, hydrogen chloride itself still exists in the reaction system and is finally consumed by ammonia gas. Neutralization forms ammonium chloride salt, and does not take into account the trace amount of DMF and trichloroethane solvents

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