A kind of recovery processing method of trichloroethane in the production of sucralose

A technology of trichloroethane, recovery and treatment, applied in the direction of sugar derivatives, sugar derivatives, sugar derivatives preparation, etc., can solve the problems of large amount of trichloroethane, large energy consumption, cumbersome process, etc. Production cost, effect of reducing processing pressure

Active Publication Date: 2019-02-22
TECHNO (FUJIAN) FOOD INGREDIENTS CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This mode not only process is loaded down with trivial details, and there is following problem: (1) the consumption of trichloroethane is big, and the energy loss of then distillation process is also big with this method reclaiming all; (2) anhydrous calcium chloride after use It also needs to be dried at high temperature for recycling, which also consumes a lot of energy
Therefore, the recovery and utilization of trichloroethane in the prior art still brings great pressure to energy saving and consumption reduction.

Method used

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Embodiment

[0016] In the present embodiment, a method for recycling trichloroethane in the production of sucralose, the steps are as follows:

[0017] (1) Take 250mL of chlorinated sugar water (wherein the content of trichloroethane is 60%), and carry out vacuum distillation at a temperature of 85°C and a negative pressure of -0.05Mpa (vacuumized by a water circulation vacuum pump), and the distilled gas After being condensed into a liquid by the condenser, it enters the collection tank and collects 75mL of distilled material (the content of trichloroethane is 90%). After testing, the moisture content of the distilled material is less than 0.1%, which meets the feeding requirements;

[0018] (2) Pass the above-mentioned distillation material into an inert gas (such as nitrogen) at a temperature of 85° C. for heating and reflux aeration. The aeration time is 3 hours to remove the acid therein (entering the acid gas absorption tower) to obtain trichloroethane Alkanes products.

[0019] Th...

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PUM

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Abstract

The invention discloses a recycling method for trichloroethane in the production process of sucralose. The recycling of the trichloroethane is realized in the cooling process after a chlorination reaction is finished by distillation under reduced pressure and reflux aeration and deacidification, so that the amount of recycling the trichloroethane and the treatment pressure of the trichloroethane after quenching are greatly reduced, and the aims of saving energy and reducing consumption are achieved. According to the recycling method disclosed by the invention, the influence on normal operation of production is avoided; a recycled trichloroethane finished product is circularly used for next-generation chlorination reaction without influence on the conversion rate of sucralose-6-ethyl ester, thereby greatly reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of sucralose production, in particular to a recovery and treatment method for chlorinating agent trichloroethane used in chlorination reaction in sucralose production. Background technique [0002] Sucralose, also known as sucralose, or 4,1,6,-trichloro-4,1,6,-trideoxygalactose, its sweetness can reach 600 times that of sucrose, and it has no energy and high sweetness , pure sweetness, high safety and other characteristics, it is one of the best functional sweeteners at present. The preparation of sucralose is based on sucrose as raw material, through acylation reaction and chlorination reaction to obtain the intermediate sucralose-6-acetate, which is deacetylated in the methanol / sodium methoxide system after multiple purifications The crude product of sucralose is obtained, and the crude product of sucralose is recrystallized to obtain refined sucralose. [0003] At present, sucralose has a wide range of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H13/06C07H1/00C07C19/05C07C17/38
CPCC07C17/38C07H1/00C07H13/06C07C19/05
Inventor 陈建峰郭振明施俊戴燕斌
Owner TECHNO (FUJIAN) FOOD INGREDIENTS CO LTD
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