Method for recycling organic tin in sucralose production

A technology of sucralose and a recovery method, which is applied in the directions of sugar derivatives, chemical recovery, sugar derivatives, etc., can solve the problems of large amount of sewage and complicated steps, so as to improve production efficiency, reduce production cost and material utilization rate. optimized effect

Active Publication Date: 2015-12-02
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of complex steps and large amount of sewage generated in the existing organotin recovery method, and provide a method for recovering organotin in the production of sucralose

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0014] 1. Collect the cyclohexane phase containing organotin acetate after extraction and stratification and put it into the cyclohexane phase tank;

[0015] 2. Pump about 5000L of the cyclohexane phase extracted in batches into the cyclohexane phase washing kettle, add 600L of pure water, start stirring, the temperature is 35°C, the stirring time is 2 hours, and then stand still for 1 hour;

[0016] 3. Then separate the layers, separate the water phase at the bottom of the water washing tank to the water phase tank, and separate the cyclohexane phase to the cyclohexane phase tank;

[0017] 4. Pump 5000L of the cyclohexane phase into the cyclohexane recovery kettle, start the steam to recover cyclohexane under reduced pressure;

[0018] 5. When the temperature of the recovery kettle rises to 100°C or little cyclohexane is evaporated (discharged in a linear form), the recovery reaction ends;

[0019] 6. Close the steam valve, turn on the cooling water to cool the material in t...

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Abstract

The invention relates to a method for recycling organic tin in sucralose production. The method includes sucralose esterification reaction, dibutyltin oxide serves as a catalyst to take participate in the reaction to generate a sucrose-6-ester midbody, after a midbody solution is extracted through cyclohexane, organic tin acetic ester is dissolved in an extractant cyclohexane phase, a cyclohexane phase is extracted out, and cyclohexane is obtained through evaporation by means of a distillation still. The method is characterized by including the following steps that a, boiled cooling water is cooled to 50 DEG C, then pure water is added for stirring and washing, and stirring is carried out for one hour; b, bottom water is separated out, residues in the still are recycled organic tin acetic ester, and the residues are returned to an esterification reactor to take participate in the esterification reaction and be used repeatedly. The method has the advantages that the organic tin acetic ester is not degreased or dried and can be directly recycled and used repeatedly, so that zero emission is achieved, production cost is reduced, waste water generated in the organic tin recycling process is eliminated to the largest extent, production efficiency is greatly improved, and economic benefits are remarkable.

Description

Technical field: [0001] The invention relates to a method for recovering organotin dibutyltin oxide in the production of sucralose. Background technique: [0002] The recovery of organotin in the traditional sucralose production process mainly goes through the following process: the organotin dissolved in the solution after the esterification exists in the form of organotin acetate, and is extracted by adding the extractant cyclohexane to form DMF (N , N-dimethylamide, water and sucrose-6 ester) layer and extraction layer, organotin acetate is dissolved in the cyclohexane phase of the extraction layer, and then the cyclohexane phase is separated and placed in a still After recovering the extraction agent cyclohexane through steam heating, it is dissolved in methanol and pumped into the high-position dripping tank, and added dropwise to the organotin recovery kettle with sodium hydroxide solution in advance, and then the steam is heated to evaporate and recover methanol, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H1/00C07H13/06
CPCY02P20/584
Inventor 张正颂
Owner ANHUI JINGHE IND
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