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A nanofiltration separation method for ammonia sugar controlled by electric field and flow field coupling

A separation method and nanofiltration technology, applied in chemical instruments and methods, amino sugars, sugar derivatives, etc., can solve problems such as ineffective separation

Active Publication Date: 2020-12-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high efficiency, good economy and simple operation for ammonia sugar nanofiltration separation method in order to overcome the inability to effectively separate the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix glucosamine hydrochloride (or sulfate) and N-acetylglucosamine according to 1:2 (w / w, mass ratio), the total sugar percentage concentration is 10% (mass percentage concentration), and the flow rate on the membrane surface is 4m / s , pressure 10bar, temperature 25°C, pH=4.5, using a positively charged nanofiltration membrane, under the condition that the molecular weight cut-off of the membrane is 250Da, a direct current is applied to both ends, the voltage is 110V, and the electrode on the core side is an anode; after 10 stages of membrane separation Filtration, N-acetylglucosamine purity 98% syrup product is obtained from the filtrate side, and 95% syrup of glucosamine hydrochloride (or sulfate) purity is obtained from the concentrated side.

[0026] Core-side electrode: Since the nanofiltration membrane is a rolled membrane, the core side is the central axis of the membrane roll, and the outer side refers to the outer circumference of the membrane roll.

Embodiment 2

[0028] Mix N-acetylglucosamine and glucosamine sulfate (or hydrochloride) according to 2:1 (w / w), the total sugar concentration is 1% (mass percentage concentration), the flow rate on the membrane surface is 1m / s, and the pressure is 1bar. The temperature is 35°C, pH=8.3, using a negatively charged nanofiltration membrane, under the condition that the molecular weight cut-off of the membrane is 500Da, a direct current is applied to both ends, the voltage is 1V, and the electrode on the core side is an anode; after 5 stages of membrane separation and filtration, the filtrate side is obtained The N-acetylglucosamine purity is 78% syrup product, and the concentration side obtains the syrup of glucosamine hydrochloride (or sulfate) purity 65%.

Embodiment 3

[0030] Mix glucosamine hydrochloride and glucosamine sulfate according to 1:1 (w / w), the total sugar concentration is 40% (mass percentage concentration), the flow rate on the membrane surface is 5m / s, the pressure is 25bar, the temperature is 35°C, and the pH= 4.5. Use a positively charged nanofiltration membrane with a molecular weight cut-off of 500Da, apply direct current at both ends, the voltage is 10V, and the electrode on the core side is an anode; after 6 stages of membrane separation and filtration, glucosamine hydrochloride is obtained on the filtrate side The purity is 85% syrup, and the glucosamine sulfate purity is 60% syrup product obtained from the concentrated side.

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Abstract

The invention relates to an electric field and flow field coupling and regulation nanofiltration and separation method of glucosamine. The method comprises the steps of preparing an aqueous solution at a mass percentage concentration of 1-40% from a mixture formed by glucosamine hydrochloride or sulfate and N-acetylglucosamine to be separated at any ratio, carrying out nanofiltration and separation by a coupling and regulation policy of the electric field and the flow field under the condition: a membrane material is charged or electrically neutral, adjustable and reversible electrodes are additionally mounted on the outer side and a core side of a membrane, electrodes at the two ends can be connected with direct current or alternating current, an operating pressure scope is controlled as 1-45bar, a surface flow rate of the membrane is controlled at 1-10m / s, and the temperature and pH (potential of hydrogen) of a solution are controlled at 1-55 DEG C and 1-9. The method has the advantages of high separation efficiency, good economical efficiency, simplicity in operation, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the field of sugar and separation engineering, and relates to a nanofiltration membrane separation method for ammonia sugar and other neutral monosaccharides, in particular to a nanofiltration separation method for ammonia sugar controlled by electric field and flow field coupling. Background technique [0002] Sugar is the most abundant organic compound in the world, and exists in animals, plants and microorganisms in nature in the form of cellulose, hemicellulose and chitin. Sugar is an important structural and functional active substance for human survival. The research and production of sugar is of great significance and important status in industries such as food, medicine, and fermentation. Due to the complex and diverse specialties of sugar molecules in regioselective control and stereo configuration and conformation, the design, preparation, separation and characterization of sugar compounds are very difficult. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H5/06C07H13/06C07H1/06B01D61/02
Inventor 赵黎明朱俊颖张胜男邱勇隽周家春范立强
Owner EAST CHINA UNIV OF SCI & TECH
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