Method for separating fatty alcohols from alkyl glycoside crude product

Abstract

The invention discloses a method for separating fatty alcohols from an alkyl glycoside crude product, and belongs to the technical field of light chemical daily necessity separation. According to themethod, supercritical CO2 extraction separation technology is adopted; extracting and separating unreacted fatty alcohols are adopted to obtain a high-purity alkyl glycoside solid product; no organicsolvent is used, no post-processing is required, the cost is low, and large-scale enlarged production is easy to realize; a semi-permeable suspended barrel and an air cavity channel are adopted, on one hand, CO2 can be introduced into the air cavity channel, CO2 fluid containing the fatty alcohols is in a micro-boiling state, overflow of gaseous CO2 is accelerated, separation efficiency is accelerated, on the other hand, compared with the prior art wherein separated CO2 is discharged in one direction and gaseous CO2 is separated after CO2 feeding is stopped, the method in the invention can realize discharge outwards in multiple directions from the upper side and the air cavity channel, gaseous CO2 overflow moving path is reduced effectively, so that the separation efficiency of gaseous CO2and fatty alcohols is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of separation of light chemical daily necessities, and more specifically, relates to a method for separating fatty alcohols in crude alkyl glycosides. Background technique [0002] Alkyl Polyglycoside (Alkyl Polyglycoside for short) is a new type of non-ionic surfactant synthesized from glucose and fatty alcohols by dehydrating a molecule of water under acid catalysis. A mixture of glycosides and polyglycosides, also known as alkyl polyglycosides. APG has a series of excellent properties such as viscosity increasing, solubilizing and emulsifying, as well as high surface activity, safety and compatibility. , medicine, building materials and many other fields have a wide range of applications. [0003] In the preparation of alkyl glucoside, usually the reactant fatty alcohol is far in excess, and the excess part must be removed from the reaction product, otherwise it will not only reduce the surface activity...

AI Technical Summary

Problems solved by technology

Although this method can obtain solid alkyl glycosides, the separation process steps are complicated, the cost is high, and it is difficult to apply industrially

The invention patent with the application number 201710752316X discloses a method for obtaining powdered alkyl glycosides, using methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, acetone, butanone, cyclopentyl Ketone, a mixture of two or more of cyclohexanone, methanol, ethanol, propanol, butanol, ethylene glycol, polyethylene glycol, acetonitrile, propionitrile, and butyronitrile as the extractant, at 30°C to 60°C , extract 3-6 times to obtain powdered alkyl glycosides, although this method can obtain powdered products, but because a large amount of organic solvents are used, and there is also the problem of separation and purification of organic solvents and fatty alcohols, thereby increasing the processing steps and production cost

The application number is 2019104300559, which discloses an alkyl glycoside bleaching device, which is mainly aimed at the problem of the color of alkyl glycosides caused by the method of removing fatty alcohol by high-temperature distillation

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