Method for preparing fructose by glucose catalysis

Abstract

The invention discloses a method for preparing fructose by glucose catalysis. The method comprises the following step: under the condition that glucose is isomerized into fructose, enabling glucose tobe in contact with a modified HY molecular sieve catalyst in an alcohol-water medium, wherein the modified HY molecular sieve catalyst is obtained by the following method: impregnating an HY molecular sieve in a sodium salt solution, drying the impregnated HY molecular sieve and then roasting. The fructose prepared by the method is high in selectivity and high in yield; and furthermore, the method is simple and easy to control, and has higher popularization and application values.

Description

Technical field

[0001] The invention relates to the preparation of fructose, in particular to a method for preparing fructose catalyzed by glucose.Background technique

[0002] Fructose is a six-carbon sugar with important application value, which can be used in the preparation of fructose syrup, beverages, cakes and other food industries. At the same time, fructose can also be used to produce fine chemicals such as 5-hydroxymethyl furfural, levulinic acid, and lactic acid, and can be used in the fields of bioenergy fuel precursors.

[0003] At present, fructose is mainly derived from starch or glucose by the biological enzymatic method, and a mixed solution of fructose and glucose with a certain concentration can be obtained, and fructose can be obtained after separation and purification. Biological enzymatic method has the advantage of mild reaction, but has higher requirements for the use environment. The activity and stability of the enzyme also determine the production of fructose, and t...

Examples

preparation example Construction

[0026]For the above preparation method, it can be selected to be carried out in a conventional reactor. In order to facilitate the control of reaction conditions, it is preferably carried out in a batch-type autoclave.

[0027]In order to verify the technical effect of the present invention, the fructose yield is used to evaluate the technical effect.

[0028]The formula for calculating fructose yield is:

[0029]

[0030]In the present invention, the content of fructose in the reaction liquid is analyzed by high performance liquid chromatography, and the instrument model is UltiMate 3000.

Embodiment 1

[0033]Dry the HY molecular sieve at 110°C for 3 hours, then immerse it in a 10% sodium nitrate solution at 90°C for 3 hours, then dry the impregnated HY molecular sieve at 90°C for 2 hours, after grinding, and then increase the temperature according to the roasting At a rate of 5°C / min, the temperature is raised to 600°C and then heat-retained and roasted for 3 hours to obtain a modified HY molecular sieve;

[0034]1.5g glucose was contacted with 0.15g modified HY molecular sieve catalyst in methanol-water medium (28.5ml methanol and 1.5ml water) at 120℃ for 2 hours. After the reaction, the reaction solution was cooled and analyzed by high performance liquid chromatography The results showed that the fructose yield was 42.5%.

Embodiment 2

[0040]The implementation steps and conditions were the same as in Example 1, except that the sodium nitrate solution was replaced with sodium acetate solution. After the reaction, the reaction solution was cooled and analyzed by high performance liquid chromatography. The result showed that the fructose yield was 38.8%.

Technical field

[0001] The invention relates to the preparation of fructose, in particular to a method for preparing fructose catalyzed by glucose.Background technique

[0002] Fructose is a six-carbon sugar with important application value, which can be used in the preparation of fructose syrup, beverages, cakes and other food industries. At the same time, fructose can also be used to produce fine chemicals such as 5-hydroxymethyl furfural, levulinic acid, and lactic acid, and can be used in the fields of bioenergy fuel precursors.

[0003] At present, fructose is mainly derived from starch or glucose by the biological enzymatic method, and a mixed solution of fructose and glucose with a certain concentration can be obtained, and fructose can be obtained after separation and purification. Biological enzymatic method has the advantage of mild reaction, but has higher requirements for the use environment. The activity and stability of the enzyme also determine the production of fructose, and t...

Examples

preparation example Construction

[0026]For the above preparation method, it can be selected to be carried out in a conventional reactor. In order to facilitate the control of reaction conditions, it is preferably carried out in a batch-type autoclave.

[0027]In order to verify the technical effect of the present invention, the fructose yield is used to evaluate the technical effect.

[0028]The formula for calculating fructose yield is:

[0029]

[0030]In the present invention, the content of fructose in the reaction liquid is analyzed by high performance liquid chromatography, and the instrument model is UltiMate 3000.

Embodiment 1

[0033]Dry the HY molecular sieve at 110°C for 3 hours, then immerse it in a 10% sodium nitrate solution at 90°C for 3 hours, then dry the impregnated HY molecular sieve at 90°C for 2 hours, after grinding, and then increase the temperature according to the roasting At a rate of 5°C / min, the temperature is raised to 600°C and then heat-retained and roasted for 3 hours to obtain a modified HY molecular sieve;

[0034]1.5g glucose was contacted with 0.15g modified HY molecular sieve catalyst in methanol-water medium (28.5ml methanol and 1.5ml water) at 120℃ for 2 hours. After the reaction, the reaction solution was cooled and analyzed by high performance liquid chromatography The results showed that the fructose yield was 42.5%.

Embodiment 2

[0040]The implementation steps and conditions were the same as in Example 1, except that the sodium nitrate solution was replaced with sodium acetate solution. After the reaction, the reaction solution was cooled and analyzed by high performance liquid chromatography. The result showed that the fructose yield was 38.8%.

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