Continuous extraction method and device for sucralose esterification reaction

Abstract

The invention provides a sucralose esterification reaction continuous extraction method. The method comprises the following steps: a, feeding cyclohexane into an extraction mixer C and performing circulation; b, feeding the cyclohexane into an extraction mixer B and performing circulation when the cyclohexane overflows into a light phase intermediate tank C from an extraction separator C; c, feeding the cyclohexane into an extraction mixer A and performing circulation when the cyclohexane overflows into a light phase intermediate tank B from an extraction separator B; d, feeding DMF into an extraction mixer A and a cyclohexane phase receiving tank when the cyclohexane overflows into a light phase intermediate tank Afrom an extraction separator A, and feeding liquid into the extraction mixer B when the DMF overflows into a heavy phase intermediate tank A from the extraction separator A; e, feeding liquid into the extraction mixer C when the DMF phase overflows into a heavy phase intermediate tank B from the extraction separator B; and f, feeding liquid into a DMF phase tank when the DMF phase overflows into a heavy phase intermediate tank C from the extraction separator C. The method has the advantage that heavy phase and light phase are fed into the mixers through an automatic pump through simultaneous reverse convection of the heavy phase and light phase, the heavy phase and light phase are automatically separated through the densities of materials, the whole reaction process is stable, and the yield of products is improved.

Description

technical field [0001] The invention relates to the field of food additive production, in particular to a continuous extraction method for sucralose esterification reaction. Background technique [0002] In the production of sucralose, as the first step of the esterification reaction, DMF and cyclohexane are used as the solvent to add the traditional dehydration reaction method of catalyst organotin. After the reaction is completed, extract with cyclohexane to extract the organotin in the reaction solution. Acetate, and then vacuum distillation to recover cyclohexane, and the remaining syrupy organotin acetate was dissolved in methanol. Due to frequent manual operations, cyclohexane is added to the extraction kettle and pumped into the high-level tank for static layering treatment. The cumbersome operation affects the cycle time of production. Contents of the invention [0003] The object of the present invention is to provide a method and device for continuous extraction...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method and device for continuous extraction of sucralose esterification reaction in order to solve the defects of complex process, high energy consumption of solvent recovery and large pollution in the prior art

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