The industrial production methods of glycerin can be divided into two categories: natural oils and fats If the method uses propylene as the raw material, the glycerin obtained is called natural glycerin; if the method uses propylene as the raw material, the glycerin obtained is called synthetic glycerin.
The following suppliers of glycerin will help you learn about the production methods of natural glycerin:
Before 1984, glycerin was all produced from animal and vegetable fats for soap making. recovered from the product. So far, natural oils and fats are still the main raw materials for the production of glycerin, of which about 42% of natural glycerin is obtained from soap by-products and 58% is obtained from fatty acid production.
Saponification reaction of oils and fats in the soap making industry: The saponification reaction product is divided into two layers. The upper layer mainly contains sodium salts of fatty acids (soap) and a small amount of glycerol. The lower layer is waste alkali liquid, which contains salts, hydroxide A dilute solution of sodium in glycerol generally contains 9-16% glycerol and 8-20% inorganic salts.
Glycerin water (also called sweet water) obtained by hydrolysis of oil and fat has a higher glycerin content than soapmaking waste liquid, about 14-20%, and inorganic salts 0-0.2%. In recent years, continuous high-pressure hydrolysis has been widely used. The reaction does not use a catalyst. The sweet water obtained generally does not contain inorganic acid, and the purification method is simpler than that of spent alkali.
Whether it is soap-making waste liquid or glycerin water obtained by hydrolysis of oil, the amount of glycerin is not high, and both contain various magazines. The production process of natural glycerin includes purification, concentration to obtain crude glycerin, and The refining process of distillation, decolorization and deodorization of crude glycerin�
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