Description

Ethylene glycol monostearate (glycol monostearate or ethylene glycol monostearate) is an organic compound with the molecular formula C20H40O3. It is an ester of stearic acid and ethylene glycol.
What is glycol monostearate?

This invention discloses a method for the high-efficiency synthesis of ethylene glycol monostearate, comprising the following steps: weighing and quantitative addition of aliphatic acid, glycol, catalyst in a reactor. Heating the reactor, setting the initial heating temperature to 190°C and keeping warm for the reaction for a certain time at a temperature above 190°C.

And when the acid value of the sample is below 3 mg KOH/g, it stops the reaction and filters. Ethylene glycol monostearate can be effectively synthesized by the method of the present invention at constant pressure without solvent for a shorter time and the minimum acid content can be reached below 1.0.

This invention has the advantages of simple process and high efficiency, convenient and practical operation, safety and environmental protection, and has good practical value.

Background technology

Ethylene glycol stearate is a non-ionogenic stretching agent. Be a young, progressive business-proactive type of agent. It not only has surface height, features such as non-toxic, non-irritating, safe to use.

Due to low foam and high emulsibility, reuse emulsifier, dispersing agent, solvent, lubricant, softener, skimmer, static inhibitor, pearling agent, etc.

It is widely used in the daily chemical industry, metal, fiber process, etc., the composition of different emulsion class, washing composition, drug production.

The current domestic and foreign production method is that the raw materials of ethylene glycol stearate are produced by the catalyzed esterification process of sulfuric acid with triple press stearic acid or more lipid acid and terptalol part. The color of the product of this method is easily darkened to some extent and the corrosion of the equipment is serious.

, and the complexity of the post-treatment produces a large amount of waste alcohol-contaminated environment at the same time, thus seeking new artificial technologies and receiving publicity and attention day by day. New techniques and catalysts have emerged.

As toluene is present to form the catalyst, the blue bond is formed. The reaction time is 50 minutes, as a result, the yield of ethylene glycol monostearate can reach 96.34%. The tripolar loading agent catalyzed by p-toluenesulfonic acid is arranged and toluene is made into a blue band, the reaction time is 150 minutes and the acid conversion efficiency is 97.82%.

It bears that D72 is arranged using Zeo-karb, and the stabilized silicotungstic acid is converted into a solid super strong acid, and for the catalytic synthesis of glycol stearate, hexanaphthene is made into a blue band, and in the reaction time of 4.5 hours, the acid conversion efficiency is It reaches more than 94%.

It is a catalyst that uses sulfanilic acid and the reaction time is 3 hours and the yield of ester reaches 92.6%.