Method for preparing industrial fructose from isomerized glucose by chemical catalysis

Abstract

The invention discloses a method for preparing industrial fructose by chemically catalyzing isomerization of glucose. The steps are as follows: (1) prepare aqueous glucose solution, add borax and sodium hydroxide to the aqueous glucose solution in sequence, then add magnesium-based solid base, and react under an inert atmosphere ; (2) After the reaction, recover the solid alkali catalyst through solid-liquid separation, send the liquid into the electrodialysis system, separate the glucose and fructose complexes, and obtain the fructose borate complex solution; (3) complex the fructose borate The fructose solution flows through the boron special-effect resin to remove borax and sodium hydroxide to obtain pure fructose products. The invention adopts the combination of homogeneous base catalysis and heterogeneous solid base catalysis, which not only applies to higher substrate concentration, but also improves the isomerization rate and fructose selectivity. The simple and efficient separation of the latter provides the possibility for the development of large-scale industrial fructose-based fuels and chemicals, and has a good application prospect.

Description

technical field [0001] The invention relates to fructose preparation technology, in particular to a method for chemically catalyzing the isomerization of glucose into fructose. Background technique [0002] Compared with glucose, fructose as a sugar platform molecule is easier to prepare some high value-added chemicals (such as 5-hydroxymethylfurfural, levulinic acid, etc.). Given that glucose is widely present in biomass, developing a cost-effective fructose-glucose isomerization pathway to produce industrial fructose can promote a higher level of utilization of biomass resources. The so-called industrial fructose is relative to edible fructose, the production of industrial fructose can appropriately allow the use of catalysts and raw materials that are banned in the food industry. At present, fructose is widely used as a sweetener in the food field, and most of it is obtained by enzymatic isomerization of glucose. However, the enzymatic method is limited by the high cost ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing industrial fructose from glucose isomerization by chemical catalysis, and solve the problems of poor selectivity, low substrate concentration, and difficulty in separation and purification of catalyzed glucose isomerization into fructose by existing chemical methods