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Method for preparing isomalt from isomaltulose by catalytic hydrogenation

A technology of isomalt and isomaltulose, which is applied in the field of catalytic hydrogenation of aldose and ketose, can solve the problems of large equipment load and high risk of safe operation, and achieves reduced equipment load, high product purity and reaction conditions. mild effect

Active Publication Date: 2018-07-17
肇庆焕发生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional hydrogenation process uses a single skeletal nickel catalyst. In order to increase the reaction rate, high pressure, high temperature, and high-speed stirring are required. The conversion rate is only 97-98%. The equipment load is large and the risk of safe operation is high. There are relatively few manufacturers of maltulitol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Weigh 1200g of isomaltulose with a purity of 98wt%, add 1200g of water to the autoclave, dissolve and prepare about 2000Ml, 50% solution to obtain syrup;

[0019] 2. Weigh 8g of the skeleton nickel catalyst and 6g of the nickel-copper catalyst, add them into the syrup and stir well. During the reaction, the stirring speed is 200-300r / min; among them, the skeleton nickel catalyst is the Lei Nickel, nickel-copper catalyst preparation method as The Journal of Catalysis 81,204-13,1983 records.

[0020] 3. Adjust the pH value of the syrup to 5.0-6.0 with 2% liquid caustic soda and 2% hydrochloric acid;

[0021] 4. Check the air tightness of the high-pressure reactor. After passing the inspection, fill it with hydrogen to a pressure of 1MPa, replace it 3 times to detect the oxygen in the hydrogen to less than 0.3%, and then fill it with hydrogen to 0.6MPa;

[0022] 5. Start heating. Set the temperature to 100°C, and turn off the heat button when the temperature reaches 1...

Embodiment 2

[0033] It is substantially the same as Example 1, except that the isomaltulose is 1400g, the water is 1000g; the skeleton nickel catalyst is 18.5g, and the nickel-copper catalyst is 9.5g. The skeleton nickel catalyst is Raney nickel produced by Shanghai Xunkai Chemical Technology Co., Ltd. The preparation method of the nickel-copper catalyst is as described in Chinese patent application CN201310028518.1, and the ratio of nickel to copper is 1:1.

[0034] In step 6, carefully adjust the reaction pressure to 0.7Mpa. During the reaction process, with the continuous hydrogenation of isomaltulose, the hydrogen is consumed and the pressure drops. When it drops to 0.55Mpa, open the hydrogen valve to pressurize to 0.7Mpa, and so on. Repeat hydrogenation until the hydrogen pressure no longer drops after pressurization, which is the end of the reaction. Close the hydrogen inlet valve.

[0035] The purity of isomalt is 99.84%, and the content of reducing sugar is 0.05%.

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PUM

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Abstract

The invention discloses a method for preparing isomaltulose from isomaltulose through catalytic hydrogenation. After mixing isomaltulose and water in a certain proportion, they are added to a high-pressure reaction kettle, and the mixture is mixed with water in the presence of a catalyst. Isomalt is obtained by hydrogen reaction, reaction temperature: 110-120°C; hydrogenation pressure: 0.5-0.7MPa; reaction pH value: 5.0-6.0; catalyst is self-developed compound: skeleton nickel catalyst and nickel-copper catalyst The mixture, wherein the weight of the mixture of the skeleton nickel catalyst and the nickel-copper catalyst is 1%-2% of the weight of isomaltulose; the weight ratio of the skeleton nickel catalyst and the nickel-copper catalyst is 1:1-1:0.5. The object of the present invention is to provide a kind of mild reaction condition, high conversion rate, safe preparation method of isomalt.

Description

technical field [0001] The invention relates to the field of catalytic hydrogenation of aldose and ketose, in particular to a method for preparing isomalt by catalytic hydrogenation of isomaltulose. Background technique [0002] Most of the existing methods for preparing isomaltulose from isomaltulose by catalytic hydrogenation use isomaltulose produced by enzymatic isomerization of sucrose as the raw material for hydrogenation. Hydrogen conversion into α-D-glucofuranosyl-1,6-D-sorbitol (GPS) and α-D-glucofuranosyl-1,1-D-mannitol (GPM), the reaction product The two sugar alcohols are equimolar mixtures (with two peaks in the spectrum), called isomalt. The traditional hydrogenation process uses a single skeletal nickel catalyst. In order to increase the reaction rate, high pressure, high temperature, and high-speed stirring are required. The conversion rate is only 97-98%. The equipment load is large and the risk of safe operation is high. There are relatively few manufactu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H15/04C07H1/00B01J25/02
Inventor 丘春洪邓志斌
Owner 肇庆焕发生物科技有限公司