Sorbitan caprylate emulsifier

Abstract

The invention aims to provide a synthesis method of sorbitan caprylate emulsifier. The synthesis method is characterized by comprising the following steps: taking commercially available D-sorbitol and caprylic acid as raw materials, performing etherification and esterification, then vacuumizing, adding water, vacuumizing according to the vapor distillation principle, deacidifying in vacuum through a falling film evaporator to remove the caprylic acid, and finally adsorbing through granular magnesium silicate to prepare the sorbitan caprylate emulsifier. According to the invention, the material addition and proportioning in the reaction process are reasonably adjusted, the reaction temperature and time in deacidification and other working procedures are optimally selected, and the process is reasonable and simple to operate. The sorbitan caprylate emulsifier prepared by the invention is faint in smell, light in color, high in transparency, low in acid value, low in fatty acid residue, low in sodium ion content, less prone to acidification and favorable in stability; and meanwhile, the sorbitan caprylate emulsifier has the advantages of solubilization, emulsification assistance, tackification, corrosion resistance synergy, safe and mild performance and favorable compatibility, thereby being applicable to the fields of daily chemical cosmetics and the like.

Description

technical field [0001] The invention relates to a synthesis method of a sorbitan caprylate emulsifier, which belongs to the technical field of synthesis of ester compounds in organic chemistry. Background technique [0002] Sorbitan fatty acid ester is often used as W / O type emulsifier and is an important non-ionic surfactant with excellent emulsifying and dispersing properties. In addition, it is non-toxic, non-irritating, low-volatile and has no unpleasant smell. Due to its high critical micelle concentration and low micelle free energy, it can be widely used in industries such as petroleum, textiles, plastics, pesticides, food, cosmetics, and medicine. [0003] Sorbitan fatty acid ester products appeared in 1940. The earliest preparation method was to directly esterify sorbitol and fatty acid in a certain proportion in the presence of an alkali / acid catalyst at high temperature. The American I.C.I.A.M (formerly Atlas PowderCo.Lta ) company, which first developed this ser...

AI Technical Summary

Problems solved by technology

The traditional one-step alkali-catalyzed process is mainly used in China. The products produced by this process have deep color, many by-products, low monoester mass fraction, mostly turbid state, and unstable quality.

The two-step synthesis process, esterification first and then etherification will easily lead to excessive esterification, high mass fraction of straight-chain esters, dark color, poor fluidity and poor transparency in liquid state, and it is difficult to reduce the hydroxyl value to the qualified range of the index. Especially in terms of product monoester, diester and polyester mass fraction, quality stability and color, there is still a certain gap compared with foreign countries.

However, due to the price of lipase and recycling problems, there is still a certain gap between it and industrialized production

[0004] At present, the research on sorbitan fatty acid esters mainly focuses on high carbon chain fatty acids such as lauric acid, palmitic acid, cocoic acid, oleic acid and stearic acid, and the synthesis method of sorbitan caprylate emulsifier is rarely reported.