The advantages of enzymatic hydrolysis to prepare bioethanol are as follows:
1. More efficient. The efficiency of enzymatic hydrolysis is 10 to the 7th power to 10 to the 13th power of general inorganic catalysts. The protease has a relatively high affinity for proteins. High catalytic activity can completely hydrolyze protein raw materials;
2. It's safer. Protease itself is a protein after high temperature it is denatured into regular protein. absorbed and used by the human body. There is no residual material and potential food safety;
3. For example, papain only acts on proteins, lipase only acts on fats, and trypsin can recognize them specifically. lysine and arginine, etc., and can target specific enzymatic cleavage sites to form specific polypeptides.
Raw materials: starch, cellulosee ? They are all polysaccharides
The production process is sugar fermentation? This is actually the brewing process. One is to germinate grains, using the enzymes produced when the grains germinate to saccharify the raw materials themselves into sugar, then using yeast to convert the sugar into alcohol; the other is to use moldy grains to make distillers yeast, which is made from distillers; yeast The enzymatic preparation it contains saccharifies and ferments the cereal raw materials into wine.
What is mentioned above is that ethanol is produced by fermentation of starch. Bioethanol must take into account its effectiveness. Typically, various enzymes are used to break down starch into glucose, and then yeast is used to produce ethanol.
The actual process is
The starch is hydrolyzed into monosaccharidessuch as glucose under the action of amylase, glucoamylase, etc. Glucose undergoes anaerobic respiration by yeast under anaerobic conditions. into ethanol and provides energy for the yeast to grow on its own.
The yeast fermentation process is as follows:
Cellulose is broken down into monosaccharides such as glucose under the action of cellulase and then fermented by yeast to produce ethanol
What the two raw materials have in common in the production of bioethanol is that they must decompose macromolecular polysaccharides into glucose under the action of various enzymes, and then use the yeast to ferment them to produce ethanol.
Comparing the two bioethanols, cellulose is better for ethanol production. It can be said that cellulose is inexhaustible in nature, like plant straws, etc., like sugar cane as a raw material. The factoriesare rich in sugar, cellulose, etc., which has more benefits than eating grains and fermenting starch to produce ethanol. It's just that some technical issues are not well resolved at this stage.
The corn wet method only uses starch fermentation to make ethanol. Isn’t that the brewing process? This ancestor knew him thousands of years ago.
p>