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Chemical method of preparing fructose from glucose

A glucose and fructose technology, applied in chemical instruments and methods, preparation of sugar derivatives, organic chemistry, etc., can solve the problems of low fructose yield and selectivity, low glucose concentration, harsh reaction conditions, etc., and achieve simple and easy reaction operation The effect of high concentration and low reaction temperature

Inactive Publication Date: 2017-05-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a word, these methods reported at present also have the problems of low yield and selectivity of fructose, many by-products and high production costs.
[0005] In general, these methods reported before have problems such as low concentration of raw material glucose; low yield and selectivity of fructose, many by-products; harsh reaction conditions, high production cost, complicated operation, etc.

Method used

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  • Chemical method of preparing fructose from glucose
  • Chemical method of preparing fructose from glucose
  • Chemical method of preparing fructose from glucose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 Add raw material glucose and catalyst p-hydroxybenzoic acid to the aqueous solution so that their mass fractions are 0.36% and 0.27% respectively. The solution was reacted at 90° C. for 10 h at an atmospheric pressure, and cooled to room temperature after the reaction. The following results were obtained: the conversion rate of glucose was 49.5%, the yield of fructose was 48.1%, and the selectivity of fructose was as high as 97.0%.

[0017] Example catalyst Glucose conversion rate% Fructose yield % selectivity% Example 2 3-Chloro-4-hydroxybenzoic acid 35.7 33.9 96.1 Example 3 p-Chlorophenol 45.3 43.4 95.8 Example 4 2,4-Dichlorophenol 34.4 33.1 96.2 Example 5 Salicylamide 48.1 40.1 83.4 Example 6 4-Hydroxysalicylamide 44.9 34.4 76.6

[0018] Note Table 1: Examples 2-6 are the comparison results with Example 1. Except for the different types of catalysts, other parameters are the same as Exa...

Embodiment 7

[0019] Example 7 Add raw material glucose and catalyst p-hydroxybenzoic acid to the aqueous solution so that the mass fractions are 0.36% and 0.027% respectively. The solution was reacted at 90° C. for 10 h at an atmospheric pressure, and cooled to room temperature after the reaction. The following results were obtained: the conversion rate of glucose was 41.7%, the yield of fructose was 40.5%, and the selectivity was as high as 97.1%.

[0020] Table 2 is the experimental result of comparative example 7

[0021]

[0022]

[0023] Note Table 2: Examples 8-12 are the comparison results with Example 7, except that the type of catalyst is different, other parameters are the same as Example 7.

Embodiment 13

[0024] Example 13 The raw material glucose and the catalyst p-hydroxybenzoic acid were added into the aqueous solution so that their mass fractions were 50% and 0.75% respectively. The solution was reacted at 90° C. under one atmospheric pressure for 2 h and then cooled to room temperature. The following results were obtained: the conversion rate of glucose was 35.9%, the yield of fructose was 34.8%, and the selectivity was 96.9%.

[0025] Example catalyst Glucose conversion rate% Fructose yield % selectivity% Example 14 3-Chloro-4-hydroxybenzoic acid 23.8 22.6 95.0 Example 15 p-Chlorophenol 36.5 34.9 95.6

[0026] Note Table 3: Examples 14-15 are the comparison results with Example 13, except that the type of catalyst is different, other parameters are the same as Example 13.

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PUM

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Abstract

The invention relates to a simple chemical preparation method of preparing fructose from glucose. Under one atmospheric pressure and at a low temperature, one or more of phenol compounds such as p-methoxy phenol, p-chlorophenol, nitrophenol, and the like, is taken as the catalyst to catalyze glucose into fructose. The operation method is simple, the reaction conditions are mild, the cost is low, the yield of fructose is as high as 50%, by product is barely produced, and the selectivity is greater than 96%.

Description

technical field [0001] The invention relates to the production field of fructose, in particular to a method for catalyzing glucose to prepare fructose by using phenolic compounds as catalysts. Background technique [0002] The preparation of fructose from glucose is of great significance for the effective utilization of biomass. Fructose is an important chemical, which is more easily converted into 5-hydroxymethylfurfural, 2,5-furandicarboxylic acid, levulinic acid and other substances than glucose. These chemicals can be used to prepare plastics, green solvents, lubricants or biofuels, etc. [0003] And because the sweetness of fructose is the highest among natural sugars, it has high application value and can be widely used in the preparation of candies, beverages, cakes, dairy products and the like. [0004] At present, the synthesis of fructose in the industry is mainly to produce glucose syrup from sucrose or starch under the action of biological enzymes, and then obt...

Claims

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Application Information

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IPC IPC(8): C07H3/02C07H1/00
CPCC07H1/00C07H3/02
Inventor 孟祥光廖小红洋仁强
Owner SICHUAN UNIV
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