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Introduction
The following is the detailed production process of MSG:
Alkaline cooking
Washing the MSG mother liquor with alkaline NaOH solution can bring part of the pigment and most of the protein colloids to the water phase outside the activated carbon, or use organic substances such as phenols and acids to turn them into salts that are easily soluble in water. However, when performing alkali boiling, try to control the temperature during filtration to a higher range, generally above 80°C.
(The amount of H2O2 is 3%, the amount of co-oxidant is 2.2%, and the amount of catalyst is 0.1%) The purpose of oxidation treatment is to remove impurities that have not been washed away after alkali boiling. These impurities are impurities that can form relatively strong chemical bonds with the functional groups on the surface of activated carbon. These chemical bonds can be solved through oxidation treatment. The use of hydrogen peroxide, an oxidizing agent with moderately strong oxidizing properties in a neutral or alkaline solution, and a certain amount of catalyst can greatly improve the reaction effect.
After the waste carbon is boiled with alkali and oxidized. After decolorizing the MSG mother liquor, the transmittance is between 85% and 95%. If HC1 is used to remove impurities such as inorganic ions in the activated carbon, the transmittance can generally reach more than 95%.
Water washing and filtration can not only extend the service life of activated carbon for MSG decolorization, but also make the decolorization ability slightly better.
Choosing the right activated carbon
Different types and specifications of activated carbon have different adsorption capabilities and effects on different impurities and organic molecules. Therefore, it is necessary to select the appropriate activated carbon based on actual needs and production processes.
The amount of activated carbon added is generally 3%-5% of the MSG raw material, which needs to be adjusted according to the actual situation. Adding too much will increase cost of MSG t, while adding too little will not achieve the desired effect.
The treatment time and temperature of activated carbon are also important factors that affect the adsorption effect. Generally, the treatment time is 3-4 hours and the treatment temperature is 60-70°C. It should be noted that constant stirring and turning are required during the treatment process to ensure that the MSG evenly contacts the activated carbon and improve the adsorption efficiency.
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