Method for separating sugar alcohol dehydration reaction product by adding hydrophobic ionic liquid under reduced pressure distillation

A technology of ionic liquid and dehydration reaction, applied in the direction of organic chemistry, etc., can solve the problems of low volatility, reduced yield of isosorbide, intensified carbonization, etc., and achieve the goal of reducing carbonization, improving distillation yield and purity, and reducing loss Effect
CN107722033BActive Publication Date: 2020-06-02SHANGHAI NAT ENG RES CENT FORNANOTECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI NAT ENG RES CENT FORNANOTECH
Publication Date
2020-06-02

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Abstract

The invention relates to a method for adding hydrophobic ionic liquid to separate a sugar alcohol dehydration reaction product by reduced pressure distillation. The sugar alcohol dehydration product is separated from the top of a distillation column, heavy components are extracted by a column and contain hydrophobic ionic liquid and sugar alcohol carbide, and the hydrophobic ionic liquid can be extracted, regenerated and reused through water / organic solvent. In the separation method, the hydrophobic ionic liquid is taken as a diluent in a product rectification process after sugar alcohol reaction, the viscosity of the reaction mixture is lowered, the carbonization function of a catalyst for a reactant and the reaction product in a rectification process can be diluted, the rectification yield and purity of the sugar alcohol dehydration product can be improved, and a whole distillation and extraction combination technology has the advantages of simpleness in operation and high resource use ratio.
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Description

technical field

[0001] The invention relates to a separation process of a sugar alcohol dehydration product, in particular to a process method for separating a sugar alcohol dehydration reaction product by adding a hydrophobic ionic liquid to vacuum distillation. Background technique

[0002] The dehydration products of polysaccharide alcohols are widely used in medicine, food, cosmetics, polymers and other fields due to their special chiral structure; especially the application of isosorbide, the dehydration product of sorbitol, in the polymer industry makes the isosorbide Preparation and purification have become the focus of attention in this field. Isosorbide is a new type of plant-based functional diol with a chiral structure. At present, it is mainly prepared by two-step dehydration of sorbitol under the action of acid catalysis.

[0003] Sorbitol dehydration catalysts include liquid mineral acids and solid acids. Among them, the use of solid acid catalyst has the adv...

Claims

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