System and method for continuously hydrolyzing hemicellulose to prepare xylose liquid

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...

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

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