Study On The Production Of Ethanol From Pulp Of Corn Stalk By Simultaneous Saccharification And Fermentation

Comprehensive utilization of stalks is a very important issue.It not only concerns environmental pollution,but also affects economic efficiency.Corn stalk is mainly composed of three parts: skin,pupa and leaf.The corn stalks are relatively hard,the fibers are tight,and the organic content is high;Corn stover leaves have higher crude fat and protein content,and lower crude fiber content;Pulp of corn stalk contains a large amount of crude fat,crude protein and carbohydrates.The interior of the corn stover has a mesh-like structure and has good air permeability.This shows that full use of corn stalks resources,the pulp is separated from the corn stalks,and after fermentation,feeds are made by adding corresponding additives according to different feeding objects.The research results of the paper are as follows:In order to improve the comprehensive utilization of corn straw,Pulp of corn stalk is usually used to ferment ethanol,The effects of pH,fermentation temperature,fermentation time and enzyme concentration on the production of fuel ethanol by pulp of corn stalk fermentation are investigated by single factor experiment.The conversion rate of ethanol is taken as the index,the best enzymolysis conditions are obtained,under these enzymolysis conditions: the conditions of the pH 5.5,fermentation temperature 39.18?,fermentation time 28 h and enzyme concentration45 U/g.The ethanol concentration of pulp of corn stalk after fermentation is 9.96 g/L at the conditions of the feeding time 50.19 h and feeding quality 6.35 g.In order to make good use of the residue,classification using of stalks in the corn stalk fermentation residue was studied in this paper,by determining the content of protein and digestion in vitro of the fermentation residue,the possibility of fermentation residue of stalks in corn stalk for making livestock feeding was validated.