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Method for producing 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, incomplete reaction, etc., and achieve Improve parallel reaction selectivity and reaction completeness, low production cost and stable quality

Inactive Publication Date: 2016-12-07
南通中兴多元复合钢管有限公司
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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, and most of the reactors in the traditional sense are used for liquid-liquid reactions. The sealing performance of the kettle is not good, and the reaction is not complete; the liquid-solid phase reaction also has this problem)
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 powder engineering sodium carbonate feeding system, open the reactor sodium carbonate feeding valve, 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 6Kg / min. ...

Embodiment 2

[0022] (1) Feeding: Open the powder engineering sodium carbonate feeding system, open the reactor sodium carbonate feeding valve, 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 there is ma...

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Abstract

The invention discloses a method for producing sodium diacetate by taking a gas phase reaction as a main mode, wherein the method comprises the following steps: placing metered sodium carbonate in a reactor, starting to stir, then slowly dropping glacial acetic acid into a reactor according to the sodium carbonate / glacial acetic acid mass ratio of 1:2.125 at temperature of 40 DEG C, and controlling the temperature to be 75-90 DEG C while dropping; after feeding is finished, carrying out heat preservation reaction for 30 min at the temperature of 75-90 DEG C during a reaction process; and after the gas phase reaction is completed, drying under negative pressure, and cooling to obtain sodium diacetate crystallization particles. The sodium diacetate is produced through the gas phase reaction process in the horizontal reactor, a solvent medium is not required to be additionally added, the crystallization product has the advantages of uniform particles, good dispersibility, simple production process, easily available raw materials, low production cost, no 'three waste' discharge during the reaction process, high product purity and simple operation.

Description

technical field [0001] The present invention relates to the manufacture method of sodium diacetate, especially the method for mainly manufacturing sodium diacetate based on gas phase reaction. Background technique [0002] Sodium diacetate is a multi-functional edible chemical, mainly used as preservatives, antifungal agents, chelating agents, flavoring agents, PH regulators, meat preservatives in food and feed industries, and is also the main raw material of compound antifungal agents . 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/41C07C53/10
CPCC07C51/412C07C53/10
Inventor 宗亚娟
Owner 南通中兴多元复合钢管有限公司
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