Preparation process of 1,2-cyclohexanediol diglycidyl ether

Abstract

The invention relates to a preparation process of 1,2-cyclohexanediol diglycidyl ether by epoxy cyclohexane, which comprises the following steps of: adding water into a reactor, adding an acid catalyst, dropwise adding the epoxy cyclohexane, and carrying out hydrolysis reaction to obtain an aqueous cyclohexanediol solution; transferring the aqueous cyclohexanediol solution to an etherification reactor, adding a solvent, carrying out azeotropic dehydration, and leading the solvent to flow back to the etherification reactor, thus obtaining a cyclohexanediol solution; adding a lewis acid catalyst, dropwise adding epichlorohydrin, reacting for 2-4 hours, and then transferring the intermediate solution to a rinsing kettle; and dropwise adding an alkaline solution, reacting, adding water, carrying out full mixing, standing for separating out a lower-layer aqueous solution, and transferring residual materials to a solvent removing kettle for removing the solvent, thus obtaining a target product, namely, the 1,2-cyclohexanediol diglycidyl ether. The target product has the advantages of high epoxide value, low viscosity, low chromaticity and low volatile matters, as well as the advantages of environment friendliness and low comprehensive cost as the process takes three industrial wastes as raw materials.

Description

technical field [0001] The invention relates to a process for preparing 1,2-cyclohexanediol diglycidyl ether from epoxycyclohexane. Background technique [0002] Existing 1,2-cyclohexanediol diglycidyl ether process is based on 1,2-cyclohexanediol as raw material, firstly the refined 1,2-cyclohexanediol is dissolved in toluene, xylene, benzene, ethyl acetate Add appropriate amount of boron trifluoride diethyl ether complex as a catalyst in solvents such as esters, add a certain proportion of epichlorohydrin dropwise at an appropriate temperature, and after a certain period of reaction, remove excess epichlorohydrin under high temperature and vacuum, and add dropwise 30 -40% by weight sodium hydroxide aqueous solution, carry out ring-closing reaction, after reacting for a certain period of time, divide the lye in the system, wash to neutrality, add an appropriate amount of solvent for extraction, obtain the target product after the upper layer extract is distilled to remove t...

AI Technical Summary

Problems solved by technology

[0002] Existing 1,2-cyclohexanediol diglycidyl ether process system uses 1,2-cyclohexanediol as raw material, first dissolves refined 1,2-cyclohexanediol in toluene, xylene, benzene, ethyl acetate Add appropriate amount of boron trifluoride diethyl ether complex as a catalyst in solvents such as esters, add a certain proportion of epichlorohydrin dropwise at an appropriate temperature, and after a certain period of reaction, remove excess epichlorohydrin under high temperature vacuum, drop 30 -40% by weight sodium hydroxide aqueous solution, carry out ring-closing reaction, after reacting for a certain period of time, divide the lye in the system, wash to neutrality, add an appropriate amount of solvent for extraction, obtain the target product after the upper layer extract is distilled to remove the solvent, and The main disadvantage is high energy consumption

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