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Method for preparing hexahydric alcohol by saccharose electrolytic reduction

A technology for hexavalent alcohol and sucrose, applied in the field of preparing hexavalent alcohol, can solve the problems of high product impurities, high raw material consumption, difficult separation, etc., and achieve the effects of abundant power resources, good product quality and easy separation

Active Publication Date: 2011-04-06
GUANGXI RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the problem that the electrochemical reduction process exists is that the conversion rate is not high, and the highest conversion rate in the report is 86%, which causes the product after the reaction and the unreacted raw material to mix together, and the separation is difficult, and the obtained product has many impurities and poor quality. Poor and high raw material consumption

Method used

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  • Method for preparing hexahydric alcohol by saccharose electrolytic reduction

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Weigh 2000g of edible sucrose into a three-neck flask, add 2000ml of distilled water, add an appropriate amount of dilute hydrochloric acid, heat and stir in a water bath, keep the temperature at 80°C for 3 hours, naturally cool to 50-60°C, adjust the pH to neutral with NaOH, and add a small amount of activated carbon to the solution After decolorization, 3956.4 g of mother liquor was obtained after filtration, and the hydrolysis conversion rate of sucrose was analyzed to be 98.2%, and it was cooled for later use.

example 2

[0020] Take by weighing example 1 gained sucrose hydrolyzate 684.6g (equivalent to 1mol sucrose), add 400g Raney's nickel catalyst, be made into total volume and be 1000ml solution as electrolysis catholyte, the sulfuric acid solution that is 1ml / L is the electrolysis anode with 800ml concentration in addition Liquid and electrolyte are pumped into the anode chamber and cathode chamber of the electrolytic cell respectively. The anode of the electrolytic cell is made of lead and the cathode is made of stainless steel. The electrolysis conditions are: current density 3.2A / dm 2 , the electrolysis power is 140Ah, the electrolysis temperature is 35-40°C, the reaction process uses dilute NaOH solution to control the pH of the catholyte at 8-9; the hydrogenation conversion rate is 98.5% after the reaction is completed, and the catalyst is left for the next experiment for recycling.

example 3

[0022] Take by weighing example 1 gained sucrose hydrolyzate 684.6g (equivalent to 1mol sucrose), add 400g Raney's nickel catalyst, be made into total volume and be 1000ml solution as electrolysis catholyte, the sulfuric acid solution that is 1ml / L is the electrolysis anode with 800ml concentration in addition Liquid and electrolyte are pumped into the anode chamber and cathode chamber of the electrolytic cell respectively, and the anode of the electrolytic cell is made of PbO 2 / Ti, the cathode is made of stainless steel, the electrolysis conditions are: current density 3.2A / dm 2 , the electrolysis power is 140Ah, the electrolysis temperature is 45-50°C, the pH of the catholyte is controlled at 8-9 with dilute NaOH solution during the reaction; the hydrogenation conversion rate is 98.1% after the reaction is completed, and the catalyst is left for the next experiment for recycling.

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Abstract

The invention provides a method of preparing hexahydric alcohol with sucrose as raw material by electrolysis. The method uses the common edible sucrose as the raw material to be hydrolyzed under certain conditions; after simple pretreatment, the sucrose is put into an electrolyzer, electrolyzed and hydrogenated in the presence of catalyst; mother liquid is filtered, concentrated, crystallized, separated and purified for preparing the hexahydric alcohol, and then two products comprising mannitol and sorbitol are obtained. The method is simple in process, emits no pollutant in production process, has the products which is easy to be separated, and has the hydrogenation conversion rate over 95 percent.

Description

Technical field: [0001] The invention relates to a method for preparing hexavalent alcohols (mannitol and sorbitol) by using sucrose as raw material through electrolysis. Background technique: [0002] Hexahydric alcohol is hexanehexanol, the molecular formula is C 6 h 14 o 6 , including mannitol and sorbitol. Sorbitol and mannitol are two isomeric hexitols, which are widely used. They can be used to make surfactants, adhesives, plasticizers and food additives. Sorbitol is also used in toothpaste, cosmetics, tobacco, vitamin C and other industries; mannitol is also used in the production of diuretics, antihypertensive agents for brain and intraocular pressure, and amino acids to make compound infusions and synthetic anticancer drugs. [0003] At present, the production of sorbitol is generally produced by chemical catalytic hydrogenation of glucose at home and abroad; mannitol can be extracted from kelp, or can be obtained by catalytic hydrogenation of sucrose hydrolyzat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/04C07C29/132C07C31/26C25B3/25
Inventor 韦少平张丽娟许朝芳柯敏莫炳辉李致宝翁德洪
Owner GUANGXI RES INST OF CHEM IND CO LTD
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