CN101735032A

CN101735032A - Method for preparing sodium diacetate

Info

Publication number: CN101735032A
Application number: CN200810194403A
Authority: CN
Inventors: 唐玉量
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-04
Filing date: 2008-11-04
Publication date: 2010-06-16

Abstract

The invention discloses a method for preparing sodium diacetate, which comprises the following continuous steps: adding glacial acetic acid into a reactor provided with a stirrer, a temperature control device and a reflux condenser, starting the stirrer, adding metered calcined soda into the reactor stage by stage in a ratio of the glacial acetic acid to the calcined soda of 3-5:1 with stirring, reacting the mixture slowly at the rising temperature, adding additive into the reactor after the addition of the calcined soda is finished, starting the temperature control device, keeping the temperature between 110 and 120 DEG C, finishing the reaction when the materials in the reactor are all changed into even transparent liquid, and cooling, drying and dehydrating a reaction product to obtain a product. In the product, the mass fraction of acetic acid is 38 to 40 percent, the mass fraction of sodium acetate is 56 to 58 percent and the mass fraction of moisture is 2 to 5 percent, which accord with the product standards.

Description

Sodium diacetate preparation method

Technical field: the invention belongs to field of chemical technology, be specifically related to a kind of method of preparation of sodium Diacetate.

Background technology

Sodium Diacetate, chemical name are oxalic acid one sodium, are called for short SDA.It is a kind of white crystals thing.Sodium Diacetate is a kind of novel, broad spectrum preservation mould inhibitor, compares with other sanitass, and sodium Diacetate toxicity is little, and people, animal are had no side effect, and international organization and some developed countries are defined as completely safe food with it.Its main application has: 1) grain mould inhibitor, through the corrosion-resistanting test to rice, wheat, peanut, beans etc., sodium Diacetate obviously mould fungus inhibition is grown, and has the effect of anti-corrosive fresh-keeping.2) feed anticorrosion agent, sodium Diacetate can reduce moisture activity in the bacterium after adding feed, makes the bacterium protein sex change, reaches to make the dead purpose of thalline dehydration, thereby plays preservative activity.3) preservation agent of varieties of food items fruit, meat, fishes and shrimps etc. both can prolong preservation period, can improve flavour of food products again.4) veterinary drug.

At present, domestic sodium Diacetate generally adopts liquid phase method and the acetic acid and the soda ash liquid phase synthesizing method of acetic acid and sodium-acetate, needs to add organic or inorganic solvent in reaction.These organic and interpolations inorganic solvent have increased the intractability of follow-up workshop section, have increased production cost.

Summary of the invention: the present invention is directed to the deficiency of existing sodium diacetate preparation method, the new sodium diacetate preparation method of exploitation.

The present invention is achieved in that

In the reactor that agitator, temperature-control device and reflux exchanger are housed, earlier Glacial acetic acid is added in the reactor, start agitator, the soda ash that under agitation in batches adds metering, Glacial acetic acid and soda ash proportioning are 3-5: 1, and sluggish is carried out, and temperature rises, after adding soda ash, add additive, start temperature-control device, holding temperature is at 110-120 ℃, when material in the reactor all became the transparent liquid of homogeneous, reaction promptly finished.Cooling: with the solution cooling that reaction obtains, crystallization slowly generates, and finally becomes crystal, blends crystal.With powdery xln drying and dehydrating, get white crystal.Analyze wherein acetic acid massfraction 38%-40%, sodium-acetate massfraction 56%-58%, moisture massfraction 2%-5% meets product standard.

Embodiment: the present invention is described in detail below in conjunction with embodiment.

Embodiment 1

On the four-hole round-bottomed flask, install agitator, temperature is taken into account reflux exchanger.Glacial acetic acid adds in the four-hole bottle, starts agitator, under agitation adds the soda ash of metering in batches, and sluggish is carried out, temperature rises, add soda ash after, add additive, drive well heater, holding temperature is at 110-120 ℃, and when material all became the transparent liquid of homogeneous in the four-hole bottle, reaction promptly finished.

Cooling: the solution that reaction is obtained is poured in the beaker and is cooled off while hot, and crystallization slowly generates, and finally becomes crystal, holds in both hands with glass and blends crystal.

Dry: the powdery xln is placed thermostatic drying chamber, and drying and dehydrating gets white crystal.Analyze wherein acetic acid massfraction 38%-40%, sodium-acetate massfraction 56%-58%, moisture massfraction 2%-5% meets product standard.

Claims

1. sodium diacetate preparation method, it is characterized in that comprising following consecutive steps: in the reactor that agitator, temperature-control device and reflux exchanger are housed, earlier Glacial acetic acid is added in the reactor, start agitator, the soda ash that under agitation in batches adds metering, Glacial acetic acid and soda ash proportioning are 3-5: 1, and sluggish is carried out, and temperature rises, after adding soda ash, add additive, start temperature-control device, holding temperature is at 110-120 ℃, when material in the reactor all becomes the transparent liquid of homogeneous, reaction promptly finishes, and cooling, drying and dehydrating get product.

2. the method for claim 1 is characterized in that acetic acid massfraction 38%-40% in the product, sodium-acetate massfraction 56%-58%, and moisture massfraction 2%-5% meets product standard.