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System and method for continuously hydrolyzing hemicellulose to prepare xylose liquid

A technology of hemicellulose and xylose, which is applied in the system field of continuous hydrolysis of hemicellulose to prepare xylose liquid, can solve the problems of poor utilization of heat energy, waste of resources, complicated operation of reaction feeding and discharging, and achieve equipment energy consumption The effect of high utilization rate, convenient operation and controllable continuous production

Active Publication Date: 2019-02-19
ZHEJIANG HUAKANG PHARMA +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, the method of domestic production of xylose is mainly to obtain xylose liquid by hydrolyzing corncobs with dilute acid. This method generally adopts kettle-type intermittent hydrolysis reaction. The intermittent hydrolysis method has many disadvantages: 1. The operation of feeding and discharging materials for the reaction is complicated; 2. It is not environmentally friendly. The energy consumption is large, and the heat energy of the material discharged from the kettle cannot be well utilized after the hydrolysis is completed, resulting in a large waste of energy
The above hemicellulose lye is recovered by nanofiltration, and the remaining hemicellulose lye is not used, resulting in waste of resources

Method used

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  • System and method for continuously hydrolyzing hemicellulose to prepare xylose liquid

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Embodiment 1

[0044] With hemicellulose lye (alkaline concentration 1.5%, hemicellulose concentration 8%, flow rate 6m 3 / h) for continuous hydrolysis to prepare xylose liquid as an example.

[0045] In the first step, the neutralization end point of the pH sensor 19 in the neutralization process is set to pH7, and the flow rate of the concentrated sulfuric acid is controlled by the pH controller 110 to be 58L / h, so that the frequency of the neutralized concentrated sulfuric acid pump 13 is 36HZ. . After passing through the neutralization unit, the hemicellulose lye is transported to the acid adjustment unit through the material pump 18.

[0046] In the second step, the flow rate of the material flowmeter 24 of the hemicellulose liquid raw material in the acid adjustment operation is 6m 3 / h, chain control the flow 66L / h of the acid-adjusting sulfuric acid flow meter 26, thus controlling the frequency of the acid-adjusting concentrated sulfuric acid pump 21 to be 30HZ.

[0047] In the thi...

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Abstract

The invention relates to a system for continuously hydrolyzing hemicellulose to prepare a xylose liquid. The system comprises a neutralization unit, an acid regulating unit, a feeding unit, a liquidation jet unit, a feeding and discharging heat exchange unit and a discharging control unit, wherein the neutralization unit comprises a raw material tank, a neutralizing concentrated sulfuric acid pumpand a neutralizing pipeline mixer, the acid regulating unit comprises an acid-regulating concentrated sulfuric acid pump, an acid-regulating pipeline mixer and an acid regulating tank, the feeding unit comprises a feeding tank, the liquidation jet unit comprises a liquidation injector and a liquidation maintainer, the feeding and discharging heat exchange unit comprises a feeding and dischargingplate type heat exchanger and a first discharging temperature sensor, and the discharging control unit comprises a discharging valve and a reflux valve. The prepared xylose liquid exchanges heat witha hemicellulose liquid in the feeding and discharging plate type heat exchanger, so that the temperature of the xylose liquid is reduced, and the temperature of the hemicellulose liquid is increased.The invention also discloses a method for using the system. The system for continuously hydrolyzing the hemicellulose to prepare the xylose liquid has the advantages that heat exchanging is performedon feeding and discharging simultaneously, thereby greatly reducing the energy consumption; feeding and discharging are performed continuously, thereby improving the production efficiency, and simplifying the workers' operation.

Description

technical field [0001] The invention belongs to the technical field of xylose production by acidolysis of biomass, in particular to a system and method for preparing xylose liquid by continuous hydrolysis of hemicellulose. Background technique [0002] At present, the method of domestic production of xylose is mainly to obtain xylose liquid by hydrolyzing corncobs with dilute acid. This method generally adopts kettle-type intermittent hydrolysis reaction. The intermittent hydrolysis method has many disadvantages: 1. The operation of feeding and discharging materials for the reaction is complicated; 2. It is not environmentally friendly. The energy consumption is large, and the heat energy discharged from the kettle cannot be well utilized after the hydrolysis is completed, resulting in a large waste of energy. Since the main raw material for xylose production in China is corncobs, many residues are produced during the hydrolysis process, causing blockage of equipment and pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002C12P2201/00B01J19/0066B01J19/0086B01J19/249B01J2219/00051B01J2219/00074B01J2219/00164B01J2219/00177B01J2219/247
Inventor 江松涛廖承军罗国伟周元方顺成郑毅江雪松郑晓阳
Owner ZHEJIANG HUAKANG PHARMA
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