Food grade sodium carboxymethyl cellulose (abbreviated as NaCMC, referred to as CMC) is a water-soluble anionic ether product, using natural cotton and wood fiber as the basic raw material, by sodium hydroxide and etherification agent chloroacetic acid reaction. CMC aqueous solution is thickened, stable, maintaining moisture, emulsification and suspension.
With the market to CMC quality requirements to improve, the application of CMC in the lactic acid beverage requirements becomes more stringent, which requires lactic acid drinks added CMC, the beverage should be uniform and stable, it does not occur precipitation and precipitation of water in the shelf life. At present, domestic production of CMC is mainly ethanol solvent and cellulose material in the kneader reactor alkalization and etherification reaction, cellulose, sodium hydroxide and the reaction solvent are fully mixed with alkalization and etherification reaction to prepare carboxymethyl sodium fiber, but the general equipment and processes of etherification efficiency are low, the product to replace the uniformity and other defects. The products obtained are poor in uniformity, poor in aci d resistance, poor in stability, and in lactic acid beverages, lactic acid beverages are stratified and precipitated, so it is difficult to apply to food lactic acid beverages. Some techniques In order to improve the acidity of the sodium carboxymethyl cellulose, takes a stepwise reaction and add other crosslinking agents. And taking a step-by-step reaction, the reaction time is long, the alkali fiber production is not easy, the operation of small elasticity; add other cross-linking agent, whether can be used ing the food, needs further proof.
This method for preparing sodium carboxymethyl cellulose obtained has the advantages of proper viscosity and good acid resistance, and can be used as a suspension stabilizer for lactic acid beverage.
The product is prepared by alkalizing the reactor to alkalize the reaction, the pepper reactor etherification reaction, the neutralization washing three times refining, continuous stripping, drying and pulverizing the processes.
1. Alkalization reactor used in the alkalization reactor is a double S shaft reactor, add the appropriate raw materials: refined cotton, wood pulp, ethanol solution, sodium hydroxide solution for reaction, alkalization reaction temperature of 15-19 degree. After the end, add chloroacetic acid ethanol solution, stir well, the dispersion reaction time is 15-25 minutes, after the end of the reaction into the plow reactor.
2. In the enzymatic reaction of the coulter reactor, the stirring shaft of the coulter reactor used is a horizontal uniaxial, slowly raised to 80 degree in 30 minutes and held in the reactor. Temperature for 30 minutes. After the end of the insulation, the material cooled to 50 degree discharge, you can produce sodium carboxymethyl cellulose crude products;
3. And then in the washing, continuous stripping, drying,crushing and other processes, you can get high acid carboxymethyl cellulose sodium products.
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