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Method for preparing resin dihydric alcohol by glucose alcohol

A technology of glucitol and diol, which is applied in the field of multi-component diol raw materials, can solve the problems that there is no industrialized method for multi-component diol, achieve significant economic benefits, save rectification process, and reduce manufacturing cost. cost effect

Inactive Publication Date: 2007-10-03
DONGHUA UNIV
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

So far there is no industrialized method of using multi-component diols produced from renewable biological raw materials (using them directly as diol raw materials necessary for the polymerization process in the unsaturated resin industry)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 860 kg of glucitol, diluted with water to 25% and mixed with 4% sodium hydroxide at a molar ratio of 8:1, adjusted the pH value of the raw material solution to 13, and the raw material solution was preheated to 176°C by a preheater before entering the gap In a ton-level high-pressure reactor, under the action of a nickel / nail / cerium cracking catalyst, a cracking reaction occurs with hydrogen at a high temperature of 230°C and a high pressure of 12MPa for 60 minutes to obtain 2,800 kg of reaction products, which contain water, 1,2-propanediol , ethylene glycol, glycerin, 1,2-butanediol, 2,3-butanediol, 1,4-butanediol, 1,2-pentanediol and other glycols, methanol, ethanol, methane and other mixed products. The cleavage product of the above composition is dehydrated and heavy components removed to remove water and heavy components such as formate, acetate and propionate in the product to obtain multi-component mixed alcohol, and then enter the fractionation tower for furthe...

Embodiment 2

[0026] The glucitol hydrocracking process is the same as that in Example 1, the reaction temperature in the hydrocatalytic cracking process section is 240 degrees, the reaction time is 40 minutes, and 10 batches of fractions from 160 ° C to 240 ° C are intercepted in the fractionating tower and mixed. The dibasic alcohol total amount in the resin glycol is 95.4%, and the composition of this resin dibasic alcohol can measure and contain 39 kinds of components with gas-mass spectrometry chromatograph, and main composition is as follows:

[0027] 1,2 propylene glycol: 58.6%; ethylene glycol: 4.7%; 1,2 butanediol: 2.9%; 2,3 butanediol: 2.2%; 1,2 pentanediol: 1.5%; other 18 kinds of binary The total amount of alcohol: 25.5%; the total amount of 16 other organic substances: 4.6%.

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Abstract

A process for preparing the dibasic alcohol (used to prepare unsaturated industrial resin) from glucitol includes such steps as hydrocatalytic cracking of glucitol in high-pressure reactor, dewatering the cracked product, fractionating in fractional tower, intercepting the fractions in some temp range, and mixing.

Description

technical field [0001] The invention belongs to the field of biochemical manufacturing, in particular to a method for preparing raw materials of multi-component diols (resin diols for short) in the unsaturated resin industry with glucose alcohol. Background technique [0002] The existing chemical industry route is aimed at preparing pure chemical raw materials, but these dihydric alcohols from the petrochemical industry are expensive. At present, it is very common and Proven technology. However, using glucitol as a raw material, hydrogenation catalytic cracking under high temperature and high pressure conditions, and further fractionation of cracked products, to prepare 1,2-propanediol and ethylene glycol respectively, the various published patent technologies so far are in industrialized implementation Difficulty in purification was encountered. The products catalyzed by the hydrogenation of glucitol contain more than 40 kinds of organic substances (the percentage conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/00
Inventor 徐周文吴嘉麟陈建文
Owner DONGHUA UNIV
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