Abstract Energy is the prerequisite of human civilization and the important material base of economic growth and social development。As the most popular renewable clean energy─fuel ethanol, and its development trend has can't be held back。It has been an important task for all countries in the world to introduce the production of fuel ethanol into industrialization。At present, the country is mainly used the traditional corn, wheat and other grain starch or sugar cane juice for the production of industrial ethanol raw materials, but the cost of raw materials is too high, it is not very cost-effective。The use of food as a raw material is also a waste of land resources, but also limits the development and promotion of ethanol industrialization。Rice husk as a waste material, it also belongs to the wood fiber raw materials, renewable, clean resources。As a result, it is a lot of benefits for the production of fuel ethanol。In this way, it can avoid the atmospheric pollution and the destruction of the ecological environment caused by the burning of a large amount of straw in the field。 It is of great significance to the sustainable development of our country's economy and society。
In the extraction of glucose and fermented into ethanol test of rice husk, in order to improve the recovery of glucose, we first have to will rice husk cellulose extracted, the destruction of the structure of hemicellulose and lignin, so the first experimental preparation step is pretreatment。There are four main methods of pretreatment, respectively, high temperature and high pressure, dilute acid, dilute alkali and ammonia。According to China's national conditions of production, environmental restrictions, the experimental conditions of this experiment using dilute acid pretreatment method。
Cellulose hydrolysis is a key step in the production of ethanol from rice husk。Fibrous structure of wood fiber raw material composition is very close and chemical method is difficult to completely hydrolyzed and does not destroy the glucose structure, so after people for a long history of research found that cellulase is able to efficiently hydrolyze cellulose a substance。In the raw material of wood fiber, it is not only difficult to be hydrolyzed, but also lignin, which hinders the hydrolysis of cellulose。Lignin is not only hindered, it will produce toxic products in the development of experimental follow-up, so the hydrolysis of cellulose is the most important step in the whole test。This paper focuses on the cellulose hydrolysis of four factors (pH value of buffer solution, temperature, enzyme dosage, enzymolysis time) were studied in detail, seek the most appropriate experimental conditions, glucose for the sugar rate is the highest。