Method for producing fuel ethyl alcohol with vapour explosion sweet potato direct fermentation

Abstract

The invention relates to a steam explosion sweet potato direct fermentation method for producing fuel ethanol; the main technique is that: sweet potato undergoes the steam explosion treatment for 2 to 4 minutes under a steam pressure of 0.5 to 0.8Mpa; the sweet potato after the steam explosion treatment is added with glucoamylase for saccharification, ammonium sulfate, potassium dihydrogen phosphate and activated yeast are added simultaneously for fermentation, and the ethanol generated by fermentation is distilled and collected. The invention adopts the steam explosion technology to carry out the short-time and low-pressure steam explosion pretreatment of the sweet potation with the pressure keeping time of 2 to 4 minutes and the pressure of 0.5 to 0.8 MPa, thus omitting the boiling process of starch raw materials of as long as 30 to 120 minutes and reducing the energy consumption for fermentation production of ethanol; a finished product ethanol is obtained by direct fermentation after the saccharification of the sweet potato which is processed by the steam explosion, the technique route is simple, the energy consumption is low, the production efficiency is high and the method is conductive to the high-value utilization of sweet potato.

Description

technical field [0001] The invention belongs to the field of utilization of agricultural resources, in particular to a method for producing fuel ethanol by direct fermentation of steam-exploded sweet potatoes. Background technique [0002] With the rise of oil prices, changing the existing energy structure dominated by petrochemicals and coal, making new energy a clean and efficient alternative, has become a hot spot for investment in the world. The rapid development of fuel ethanol has played an increasingly important role in replacing gasoline supply. more and more effect. It is estimated that in the next 10 years, the annual global fuel ethanol consumption will reach 16 billion to 18 billion gallons. At present, some countries such as the United States, Canada, and Brazil have passed relevant regulations, requiring that the amount of fuel ethanol in gasoline be gradually increased in the future. China has become the third largest producer of biofuel ethanol after Brazil...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for direct fermentation of steam-exploded sweet potatoes to produce fuel ethanol. In this method, steam-explosion technology is applied to sweet potato pretreatment, and sweet potatoes treated by low-pressure steam explosion can be directly fermented to produce ethanol, which solves the problem of sweet potato starch fermentation. Before ethanol, it needs to consume a lot of energy for sweet potato crushing and starch cooking and liquefaction.