Preparation process of lignocellulose pulping prehydrolyzate with high-efficiency fermentation capacity

Abstract

The invention provides a preparation process of lignocellulose pulping pre-hydrolysis liquid having efficient fermentation capability based on an advanced oxidation process and electrodialysis treatment against the problems of lignocellulose hydrolysis liquid detoxification in the prior art. The preparation process comprises the following steps: 1, preparing pulping pre-hydrolysis liquid; 2, conducting concentration, and removing sediment; 3, conducting advanced oxidation treatment; 4, conducting electrodialysis treatment. According to the preparation process, the pre-hydrolysis liquid generated in the production processes of chemimechanical pulp and dissolving pulp in the pulping and papermaking industry serves as the treatment object, firstly, organic inhibitor molecules are degraded through advanced oxidized reagent, subsequently, electrolyte inhibitor in the hydrolysis liquid is removed through an electrodialysis method, and the advanced oxidized reagent and the electrodialysis method achieve a remarkable synergistic effect. The pre-hydrolysis liquid prepared through the preparation method can serve as a fermentation carbon source and be used for fermenting and producing unicellular protein or preparing high value-added compounds. By means of a detoxificaiton method of the preparation process, under the circumstance that fermentable sugar cannot be lost, small-molecule inhibitor such as phenols can be removed, and ionogenic inhibitor can be removed.

Description

technical field [0001] The invention belongs to the field of bio-energy and pulping and papermaking, and in particular relates to a preparation process of a lignocellulose pulping prehydrolyzate, in particular to a method for preparing lignocellulose pulping with high-efficiency fermentation capacity by using an advanced oxidation method and an electrodialysis method Process method of prehydrolyzate. Background technique [0002] Due to the shortage of high-quality pulp and paper raw materials, the continuous increase in the price of traditional resources, the rise in labor costs and the enormous pressure brought about by global competition, traditional pulp and paper enterprises are currently facing unprecedented difficulties. The old business model of simply converting lignocellulose into pulp and paper products is no longer suitable for the existing market. Combining the pulp and paper industry with biomass refining, pre-hydrolyzing plant fiber resources before pulping c...

AI Technical Summary

Problems solved by technology

①Rotary evaporation can reduce the concentration of low-boiling organic substances in the hydrolyzate, such as acetic acid, furfural and aldehyde vanillin, etc., but new inhibitors will be produced at high temperature, resulting in a decrease in fermentation efficiency

②Using volatile organic solvents such as diethyl ether and ethyl acetate to extract the hydrolyzate can remove most of the inhibitors, but there are disadvantages of difficult recovery of organic solvents and residual organic solvents

③ Activated carbon has strong adsorption characteristics, but the adsorption of inhibitors by activated carbon is affected by the properties of the inhibitors, the pH of the prehydrolyzed solution, the pretreatment temperature, time and the concentration of activated carbon, and the degree of removal of inhibitors is limited

④Ion exchange resin adsorption has a significant effect on the removal of weakly acidic inhibitors, but the removal effect on furfural inhibitors is limited, and this method will remove a large amount of fermentable sugars while removing inhibitors, resulting in the loss of fermentation products. Yield is greatly reduced

⑤Membrane separation can remove inhibitors such as furfural, hydroxymethylfurfural, and acetic acid in the hydrolyzate, but cannot effectively remove small molecule phenolic compounds with molecular weights similar to glucose and xylose

In addition, the simple application of electrodialysis can only remove organic acid inhibitors such as formic acid and acetic acid in the pulping prehydrolyzate, and can hardly remove aromatic small molecule inhibitors, which leads to the fact that the pure application of electrodialysis cannot achieve pulping prehydrolysis Efficient detoxification of liquid

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