Method for producing ethyl alcohol by using sorgo stalk

Abstract

The invention discloses an ethanol production method by utilizing sweet sorghum stalks, which pertains to the field of plant fuel. The invention includes the following steps that: the juice and the residue of the sweet sorghum stalks are separated, then the sweet sorghum residue is treated with diluted acid explosion pretreatment, fermentable sugar is obtained by the enzymolysis of a cellulase , then the sweet sorghum juice and the sorghum residue are processed to obtain the fermented sugar liquid, concentration and regulation of the fermented sugar liquid are carried out, and finally the ethanol is prepared by using the brewing yeast for fermentation. The method of the invention can make full use of the sweet sorghum stalks and has the advantages of short fermentation time, high enzymolysis efficiency of the cellulose, high ethanol yield, etc.

Description

technical field [0001] The invention belongs to a biofuel production method, in particular to a method for producing ethanol by using sweet sorghum stalks. Background technique [0002] Excessive exploitation and use of oil, natural gas, and coal have caused the world to face serious energy and environmental crises. Finding alternative, sustainable, environmentally friendly green energy has become the focus of the world's energy strategy. Biofuel ethanol is a feasible alternative. At present, China mainly produces fuel ethanol with aged grains as raw materials. , CO of grain ethanol 2 The amount of release has not been reduced, and the purpose of environmental protection cannot be achieved. At the same time, the use of grain to produce fuel ethanol not only costs high, but also causes waste of grain. Therefore, it is necessary to find new plant raw materials for the production of biofuels. Sweet sorghum stalks are rich in sugar and fiber, and are an ideal raw material for ...

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Problems solved by technology

[0004] At present, the production of fuel ethanol from sweet sorghum stalks is mainly carried out by fermenting the sap of sweet sorghum stalks or grains plus juice, such as the patent application "Method for Producing Ethanol from Sweet Sorghum Stalk Juice" (Application No.: 200510076833.7), "Using Sweet sorghum stalk production ethanol liquid fermentation technology" (application number: 200410035604.6), "sweet sorghum stalk production ethanol process method" (application number: 02151719.3), "a kind of fuel ethanol and its production process" (application number No.: 2007100022972.4), "Technology for Producing Ethanol Using Sweet Sorghum Stalk or Sweet Sorghum Dry Straw as Raw Material" (Application No.: 200610134397.9), etc., mainly utilize sweet sorghum stalk juice to produce ethanol, "Use Sweet Sorghum Straw and its The method for producing ethanol from grains" (application number: 200710057584.6), "method for producing ethanol with sweet sorghum stalks" (application number: 200710010720.6), etc. utilize sweet sorghum stalk juice and grains to produce ethanol, and these inventions use the stalk Juice fermentation only utilizes part of the soluble sugar in the sweet sorghum stalk, and discards or burns the structural sugar in the form of cellulose and hemicellulose that is almost equal to the soluble sugar in the sweet sorghum dregs, which not only causes a lot of waste, The utilization rate of raw materials is low, and it causes air and environmental pollution

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