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Method for preparing invert sugar by microwave reaction and special equipment thereof

A technology for microwave reaction and invert sugar, which is applied in the field of microwave reaction to prepare invert sugar, can solve the problems of caramelization, decreased reaction speed, low conversion rate, etc., and achieves the effects of continuous production, less by-products, and high product purity

Active Publication Date: 2010-02-17
ZHENGZHOU TOBACCO RES INST OF CNTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems that this method exists are: long reaction time (generally need 1.5-2.0 hours), conversion rate is not high (generally about 85%-90%), labor intensity is bigger, product quality stability is poor, raw material is heated at high temperature Agglomeration, caramelization, etc. are prone to occur under the environment, and the product color is darker
In addition, due to the power limitation of the microwave magnetron, if the reaction liquid is a microwave-absorbing substance (such as water), the energy of the microwave field will be absorbed and attenuated by a large amount in the outer layer (3-4cm) of the reaction liquid, and the microwave cannot radiate to the inside of the reaction liquid, resulting in practical The reaction rate decreases, affecting the reaction yield
Due to the microwave leakage problem, it is not easy to achieve continuous microwave reaction

Method used

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  • Method for preparing invert sugar by microwave reaction and special equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sucrose is formulated into a 30% aqueous solution, and after adding 1% citric acid as a catalyst, it is input into the feeding device 4 for subsequent use. The input and flow rate of the feed liquid are controlled by the flow pump 3, and the reaction tube 1 is a polytetrafluoroethylene coil tube with a single tube inner diameter of 20 mm, a single tube outer diameter of 25 mm, and a tube length of 120 m. Turn on the microwave generator 2, the microwave power is 1500 watts, and start the flow pump to start the continuous reaction. In order to make the reaction time reach 5 minutes, adjust the flow pump to control the flow rate to 0.4m / s. Under these conditions, the continuous reaction can produce 450L of invert sugar solution per hour, and the color of the material liquid flowing out after microwave conversion has almost no change. Liquid chromatography analysis shows that the conversion rate of sucrose is 95.5%.

Embodiment 2

[0021] Compared with Example 1, Example 2 increased the amount of catalyst and microwave power.

[0022] The sucrose is formulated into a 30% aqueous solution, and after adding 3% citric acid as a catalyst, it is input into the feeding device 4 for subsequent use. The input and flow rate of the feed liquid are controlled by the flow pump 3, and the reaction tube 1 is a polytetrafluoroethylene coil tube with a single tube inner diameter of 20 mm, a single tube outer diameter of 25 mm, and a tube length of 120 m. Turn on the microwave generator 2, the microwave power is 2500 watts, and start the flow pump to start the continuous reaction. In order to make the reaction time reach 5 minutes, adjust the flow pump to control the flow rate to 0.4m / s. Under these conditions, the continuous reaction can produce 450L of invert sugar solution per hour, and the color of the material liquid flowing out after microwave conversion hardly changes. Liquid chromatography analysis shows that the...

Embodiment 3

[0024] Compared with Example 1, Example 3 increases the flow rate and reduces the length of the reaction tube.

[0025] The sucrose is formulated into a 30% aqueous solution, and after adding 1% citric acid as a catalyst, it is input into the feeding device 4 for subsequent use. The input and flow rate of the feed liquid are controlled by the flow pump 3, and the reaction tube 1 is a polytetrafluoroethylene coil tube with a single tube inner diameter of 20 mm, a single tube outer diameter of 25 mm, and a tube length of 80 m. Turn on the microwave generator 2, the microwave power is 1500 watts, start the flow pump to start the continuous reaction, adjust the flow pump, control the flow rate to 0.6m / s, and the reaction time is 2.22 minutes at this time. Under these conditions, the continuous reaction can produce 675L of invert sugar solution per hour, and the color of the material liquid flowing out after microwave conversion has almost no change. Liquid chromatography analysis ...

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Abstract

The invention relates to a method for preparing invert sugar by microwave reaction and special equipment thereof. The invention is characterized in that the method directly obtains invert sugar by thefollowing steps: adding a catalyzer to a sugar solution and then reacting under microwave irradiation in a flowing way to obtain the invert sugar. The method has the actual conditions: adopting a glass, plastic or stainless steel coiled tube as a microwave irradiation reaction tube for the solution to pass, wherein the tube diameter is 2-6cm, the wall thickness of the single tube is 3-8mm, the tube length is 80-150m, the microwave power is 1000-3000W, and the flow speed of the solution when passing the microwave irradiation reaction tube is controlled between 0.2 and 0.8m / s. Compared with theprior art, the invention has the advantages that the flow speed of the sugar solution in the reaction tube is controlled by adding a set of reaction tubes in a microwave reactor, so that the sugar solution can receive sufficient microwave irradiation in the reaction tube and can be quickly converted, thereby realizing the continuous production of the sugar solution. Moreover, the product conversion rate exceeds 95%, the product purity is high, and byproducts are few.

Description

technical field [0001] The invention relates to the preparation technology of invert sugar, in particular to a method for preparing invert sugar by microwave reaction and special equipment thereof. The preparation method has the advantages of fast reaction speed, high conversion rate, high production efficiency and low energy consumption. Background technique [0002] Invert sugar is currently widely used in food, beverage, medicine, and tobacco industries. It mainly uses acids to hydrolyze sucrose solution and convert it into a mixed solution of fructose and glucose. The main problems that this method exists are: long reaction time (generally need 1.5-2.0 hours), conversion rate is not high (generally about 85%-90%), labor intensity is bigger, product quality stability is poor, raw material is heated at high temperature Agglomeration, caramelization, etc. are prone to occur under the environment, and the product color is darker. [0003] Microwave technology is a new techn...

Claims

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Application Information

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IPC IPC(8): C13K3/00
Inventor 胡军曾世通刘珊刘洋赵明月胡有持
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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