Method for removing lignin

Abstract

The invention relates to a method for removing lignin. The method comprises the following steps of 1. performing alkaline treatment and microwave treatment on raw material particles so as to remove the lignin from the raw material particles, and generating hydrolysate containing the lignin; and 2. performing solid-liquid separation on solid particles retained from the raw material particles subjected to lignin removal and the hydrolysate. According to the method for simultaneously executing alkaline treatment and microwave treatment, the treatment period is short, the treatment capacity is high and the efficiency is high; furthermore, due to solid-liquid separation, the solid particles without the lignin can be used as raw materials for a subsequent technology, such as ethyl alcohol production.

Description

technical field [0001] The invention relates to a method for removing lignin. Background technique [0002] Fuel ethanol is obtained from biomass through biological fermentation and other means, and can be used as fuel ethanol. It is an environmentally friendly and renewable energy source. At present, the raw materials for the production of fuel ethanol are mainly sugary and starchy crops, that is, the first generation of fuel ethanol technology, and its process is generally divided into four stages, namely liquefaction, saccharification, fermentation, and refining. However, the first-generation fuel ethanol technology has the disadvantage of "competing with people for food and land with food". Therefore, in recent years, the second-generation fuel ethanol technology using agricultural waste straw, ie lignocellulose, as a raw material has attracted the attention of scientists from various countries. Compared with the first-generation technology, the second-generation fuel ...

AI Technical Summary

Problems solved by technology

The main disadvantage of alkali treatment is that the cost of NaOH and KOH is high and it is not easy to recycle, and the waste liquid will cause environmental pollution; Ca(OH) 2 The conditions of ammonia and ammonia are mild and easy to recover, but the pretreatment time is too long

The chemical method has been widely used due to the advantages of simple process operation, low energy consumption, and obvious effect, but its solvent consumption is large, and more expenses need to be invested in environmental pollution control.

[0005] The biological method uses microorganisms that can decompose lignin to remove lignin to destroy its enveloping function on cellulose. It has the advantages of mild reaction conditions, low energy consumption, high selectivity, low environmental pollution, and low treatment cost. However, there are microorganisms Few species, low decomposing enzyme activity, long reaction conversion cycle, etc.

Images