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Method for preparation of Palatinitol by catalytic hydrogenation of isomaltulose

A technology of isomalt and isomaltulose, which is applied in the field of catalytic hydrogenation of aldose and ketose, can solve the problems of high safety operation risk and heavy equipment load, achieve high product purity, reduce equipment load, and improve The effect of operational security

Active Publication Date: 2015-10-28
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 preparation of Palatinitol by catalytic hydrogenation of isomaltulose. The method includes: mixing isomaltulose with water according to certain ratio, then putting the mixture into a high pressure reaction kettle to react with hydrogen under a temperature of 110-120DEG C, a hydrogenation pressure of 0.5-0.7MPa and a reaction pH value of 5.0-6.0 in the presence of a catalyst so as to obtain Palatinitol. The catalyst is independently researched, developed and compounded, and is a mixture of a skeletal nickel catalyst and a nickel-copper catalyst in a weight ratio of 1:1-1:0.5, wherein the weight of the mixture of the skeletal nickel catalyst and the nickel-copper catalyst accounts for 1%-2% of the weight of isomaltulose. The invention aims to provide the safe Palatinitol preparation method with mild reaction conditions and high conversion rate.

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 manufac...

Claims

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Application Information

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Patent Type & Authority Applications(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