Lignocellulose pretreatment method and system containing acid recovery

Abstract

The invention discloses a method for preprocessing and reclaiming lignocellulose and a device of the method, wherein the method comprises: installing the lignocellulose into a recycle reactor, injecting hydrochloric acid, opening a circulating pump to carry out cyclic reaction under the temperature of 50DEG C-200DEG C, adding chloride salt into hydrolyzate which is obtained after the reaction is finished and heating, absorbing HCI which is volatilized and water vapour which is generated by negative pressure which is produced by a Venturi tube that water currents flow through, reclaiming the HCI in the hydrolyzate through flowing circularly, and using the hydrolyzate after acid-removing to ferment. The method of the invention can effectively increase the conversion rate of hemicellulose, the removal rate of lignin and the conversion rate of cellulase hydrolysis in the lignocellulose, fermentation inhibiting products are reduced, the energy consumption is lowered, the using amount of the cellulase is reduced, the sugar concentration is increased, simultaneously, the HCI can be reclaimed and utilized, the problem of environmental pollution is solved, and simultaneously matching between the sugar concentration and the fermentation concentration is further increased.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method and equipment for lignocellulose pretreatment by using hydrochloric acid and a method and equipment for acid recovery thereof. Background technique [0002] Lignocellulose pretreatment refers to the use of chemical and physical methods to separate its three components, cellulose, from lignin and hemicellulose. At the same time, the internal hydrogen bonds of cellulose are opened to become amorphous cellulose, part of the glycosidic bond is broken, the degree of polymerization is reduced, hemicellulose is hydrolyzed into monosaccharides such as xylose and arabinose, and the subsequent enzymatic hydrolysis rate is improved. At present, the pretreatment methods include concentrated acid method, dilute acid warm baking method, alkali treatment method, sulfur dioxide method, peroxide method, steam explosion method, ammonia fiber explosion method, carbon dioxide ex...

AI Technical Summary

Problems solved by technology

But the semi-fiber hydrolysis rate of the dilute acid warm roasting method is also not high (70%~80%), and because the acid concentration is too low, the catalytic efficiency is low, the reaction time required for the dilute acid warm roasting method is longer, and the power cost is consumed If the reaction time is too long, the sugar monomers will further produce fermentation inhibitors such as furfural, formic acid, acetic acid, and hydroxymethylfurfural, which will affect the subsequent enzymatic hydrolysis

However, although the catalytic efficiency can be improved after the acid concentration is increased, the ensuing environmental pollution problem has also become a major obstacle.

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