Method for preparing sodium diacetate

A technology of sodium diacetate and sodium carbonate, applied in chemical instruments and methods, carboxylate preparation, carboxylate preparation, etc., can solve the problems of poor control of the reaction process, poor sealing performance, difficult recovery of mother liquor, etc., and achieve Improve parallel reaction selectivity and reaction completeness, low production cost, white appearance effect

Active Publication Date: 2014-04-02
NANTONG ALCHEMY BIOTECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the large-scale production of sodium diacetate at home and abroad mainly includes sodium acetate-acetic acid method, acetic acid~acetic anhydride-sodium carbonate method and acetic acid-sodium hydroxide method, etc. However, due to the one-time addition of each reactant in the reaction process, All problems such as poor control of the reaction process, long reaction time and difficulty in mother liquor recovery
In addition, most of the existing reactors are reactors. Reactors in the traditional sense are mostly used for liquid-liquid reactions, and do not have gas-solid and liquid-solid phase reaction capabilities, which have certain limitations (gas-solid reaction traditional reaction The sealing performance of the kettle is not good, and the reaction is not complete; this problem also exists in the liquid-solid phase reaction)
Therefore these existing techniques of producing sodium diacetate need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Feeding: Open the sodium carbonate feeding system of the powder project, open the sodium carbonate feeding valve of the reactor, and add the measured sodium carbonate into the horizontal reactor. When the sodium carbonate is half fed, the reactor is started to stir. After the feeding is completed, the feeding system is closed, the steam-water mixer and the hot water circulation pump are turned on, and the reactor is heated.

[0015] When the temperature of the gas phase in the reactor rose to 40°C, the water inlet and outlet valves of the jacketed condenser were opened, the emptying valve was opened, the valve of the reactor to the tube condenser was closed, and the mass ratio of sodium carbonate and glacial acetic acid was 1: 2.125 Add glacial acetic acid drop by drop at a rate of 4.5Kg / min. Be careful not to flush the material and keep the temperature at 78°C. When the temperature is normal and there is no material phenomenon, increase the drop rate and the rate is...

Embodiment 2

[0022] (1) Feeding: Open the sodium carbonate feeding system of the powder project, open the sodium carbonate feeding valve of the reactor, and add the measured sodium carbonate into the horizontal reactor. When the sodium carbonate is half fed, the reactor is started to stir. After the feeding is completed, the feeding system is closed, the steam-water mixer and the hot water circulation pump are turned on, and the reactor is heated.

[0023] When the temperature of the gas phase in the reactor rose to 40°C, the water inlet and outlet valves of the jacketed condenser were opened, the emptying valve was opened, the valve of the reactor to the tube condenser was closed, and the mass ratio of sodium carbonate and glacial acetic acid was 1: 2.125 Add glacial acetic acid drop by drop at a rate of 4.5Kg / min. Be careful not to rush the material and keep the temperature at 88°C. When the temperature is normal and there is no material phenomenon, increase the drop rate to 6Kg / min. If t...

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Abstract

The invention discloses a method for preparing sodium diacetate mainly through a gas-phase reaction, which comprises the following steps of firstly adding metered sodium carbonate into a reactor and stirring; slowly dropwise adding glacial acetic acid into the reactor at 40 DEG C according to a mass ratio of sodium carbonate to glacial acetic acid of 1:2.125 while controlling the temperature at 75-90 DEG C; after the feeding, performing a thermal insulation reaction of the reaction process for 30 minutes at 75-90 DEG C; after the gas-phase reaction, performing negative-pressure drying and cooling to obtain crystalline particles of sodium diacetate. According to the method disclosed by the invention, sodium diacetate is prepared through a gas-phase reaction process in a horizontal reactor without adding a solvent medium, and the obtained crystalline product particles are uniform and have good dispersity; moreover, the production process is simple, the raw materials are easily available, the production cost is low, the discharge of 'three wastes' in the reaction process is avoided, the product purity is high, and the operation is simple.

Description

technical field [0001] The present invention relates to a kind of manufacture method of sodium diacetate, especially a kind of method mainly produces sodium diacetate by gas phase reaction. Background technique [0002] Sodium diacetate is a multifunctional edible chemical, mainly used as preservative, antifungal agent, chelating agent, flavoring agent, PH regulator, meat product preservative in food and feed industry, and it is also a compound antifungal agent. main ingreadient. It has the functions of high-efficiency anti-mold, fresh-keeping, and increasing nutritional value. It is not only suitable for safe storage of grain seeds, but also suitable for anti-mold and fresh-keeping of feed, increasing nutritional value, and improving palatability. It is especially suitable for fresh-keeping of corn and grains. At present, the large-scale production of sodium diacetate at home and abroad mainly includes sodium acetate-acetic acid method, acetic acid~acetic anhydride-sodium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/10C07C51/41
CPCC07C51/412C07C53/10
Inventor 许卫东卞杨伟
Owner NANTONG ALCHEMY BIOTECH DEV
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