Write method of preparation of dihydric alcohol?
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Answer:
The invention discloses a preparation method of dihydric alcohol, comprising the following steps of: reacting dextrose water with the pH value of 12-14 and the weight percentage content of 10-50 percent for 0.5-2 hours in the presence of a hydrogenolysis catalyst at the reaction temperature of 130-150 DEG C and the hydrogen pressure of 6-8 MPa, wherein glucose is used as a raw material; then raising the temperature to 220-250 DEG C, and reacting for 0.5-2 hours at the hydrogen pressure of 10-13 MPa; and cooling, filtering and rectifying a reaction product to obtain the dihydric alcohol, wherein the hydrogenolysis catalyst is a nickel-molybdenum-copper catalyst doping chromium or ferrum, stannum and zinc, the usage amount of the hydrogenolysis catalyst is 15-30 percent relative to the mass of the glucose, and the dihydric alcohol is a dihydric alcohol which has a carbon number of 2-4. The invention is mainly used for preparing the dihydric alcohol and especially used for preparing the dihydric alcohol which has the carbon number of 2-4.
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Answer:
The invention discloses a preparation method of dihydric alcohol, comprising the following steps of: reacting dextrose water with the pH value of 12-14 and the weight percentage content of 10-50 percent for 0.5-2 hours in the presence of a hydrogenolysis catalyst at the reaction temperature of 130-150 DEG C and the hydrogen pressure of 6-8 MPa, wherein glucose is used as a raw material; then raising the temperature to 220-250 DEG C, and reacting for 0.5-2 hours at the hydrogen pressure of 10-13 MPa; and cooling, filtering and rectifying a reaction product to obtain the dihydric alcohol, wherein the hydrogenolysis catalyst is a nickel-molybdenum-copper catalyst doping chromium or ferrum, stannum and zinc, the usage amount of the hydrogenolysis catalyst is 15-30 percent relative to the mass of the glucose, and the dihydric alcohol is a dihydric alcohol which has a carbon number of 2-4. The invention is mainly used for preparing the dihydric alcohol and especially used for preparing the dihydric alcohol which has the carbon number of 2-4.