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Method for preparing D-fructose through isomerization of D-glucose

A technology of glucose and isomerization, applied in the field of D-glucose isomerization reaction, can solve the problems of metal loss, difficult separation of catalysts, etc., and achieve the effect of high product yield

Inactive Publication Date: 2016-08-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is a method for preparing D-fructose by isomerizing D-glucose, and its purpose is to solve the problems that the biological enzyme method existing in the prior art requires harsh reaction conditions, while the chemical method catalyst is generally difficult to separate, metal loss and the like. Provided is a method for preparing D-fructose from D-glucose isomerization raw materials, the reaction conditions are mild, and the catalyst is easy to recycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 1 g D-glucose, 0.1 g Fe / beta molecular sieve (Si / Al=33, Fe / Al=0.05), 50 mL deionized water into the autoclave, at a speed of 500 r / min, at a temperature of 130 °C After reacting for 90 min, the contents of D-glucose and D-fructose were measured by high performance liquid chromatography. The conversion rate of D-glucose was 33%, and the yield of D-fructose was 17%.

Embodiment 2

[0017] Add 1 g D-glucose, 0.1 g Fe / beta molecular sieve (Si / Al=33, Fe / Al=0.05), 50 mL deionized water into the autoclave, at a speed of 500 r / min, at a temperature of 150 °C After reacting for 90 min, the contents of D-glucose and D-fructose were measured by high performance liquid chromatography. The conversion rate of D-glucose was 55%, and the yield of D-fructose was 22%.

Embodiment 3

[0019] Add 1 g D-glucose, 0.1 g Fe / beta molecular sieve (Si / Al=33, Fe / Al=0.05), 50 mL deionized water into the autoclave, at a speed of 500 r / min, at a temperature of 110 °C After reacting for 90 min, the contents of D-glucose and D-fructose were measured by high performance liquid chromatography. The conversion rate of D-glucose was 18%, and the yield of D-fructose was 7%.

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Abstract

The invention provides a method for preparing D-fructose through isomerization of D-glucose .The method includes the following processing steps that firstly, adding D-glucose, solvent and a catalyst into a high-pressure reaction kettle to form a reaction system, wherein the mass concentration of D-glucose is 0.1-99%, and the mass ratio of the catalyst to D-glucose is 0.01-10; secondly, conducting reaction for 0.01-100 hours under the protection of inert gas at a temperature of 20-400 DEG C, and conducting separation and purification after reaction ends to prepare D-fructose .The method has the advantages that the applied catalyst is low in price, easy to obtain, free of toxin, environmentally friendly and high in product yield .

Description

technical field [0001] The invention relates to a method for preparing D-fructose by isomerizing D-glucose with a heterogeneous catalyst, belonging to the technical field of D-glucose isomerization. Background technique [0002] Fructose is a common ketohexose, which is the sweetest sugar. It can replace glucose as a sweetener, and when fructose is metabolized in the body, it will not lead to diabetes due to excessive intake. It is expected to become a new trend of human sugar consumption. Fructose is also an important raw material for the synthesis of 5-hydroxymethylfurfural and mannitol, so it is increasingly valued in the chemical industry and human life. [0003] At present, the industrialized method for producing D-fructose is as follows: starch or D-glucose is used as raw material, and biological enzymes such as D-xylose isomerase are used to catalyze the conversion into D-fructose. Enzymatic production of D-fructose has the advantages of high selectivity, but because...

Claims

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Application Information

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IPC IPC(8): C07H3/02C07H1/00B01J29/76
CPCB01J29/7615C07H1/00C07H3/02
Inventor 夏海岸肖克浩徐思泉左宋林
Owner NANJING FORESTRY UNIV
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