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Study on Catalytic Hydrogenolysis of Sucrose to C2～C3 Polyhydric Alcohols over (Cu, Mo, Ni)/Kieselguhr-Catalyst

Author: JiangYongShan
Tutor: ZhuHongJi
School: Tianjin University
Course: Chemical Process Equipment
Keywords: Cu,Mo,Ni/kieselguhr catalyst sucrose hydrogenolysis C2~C3 polyhydric alcohols
CLC: TQ223.16
Type: Master's thesis
Year: 2009
Downloads: 23
Quote: 0
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Abstract


C2~C3 polyhydric alcohols including ethylene glycol, propylene glycol and glycerol are widely used in the chemical fibre, automobile, food and medical industries. C2~C3 polyhydric alcohols were produced conventionally by the raw materials from petroleum resource. Therefore, with the the exhaustion of oil resource, the process of sucrose hydrogenolysis to C2~C3 polyhydric alcohols shows broad propects due to its economic advantages, and it is based on biomass renewable resource, thus can meet the requirements of continuable development.In this paper, originally,the Cu,Mo,Ni/kieselguhr catalysts were prepared by the dipping precipitation method, kieselguhr as the support and the salts of Cu、Mo、Ni as the precursors. XRD and TPR methods were used to characterise the catalysts.The catalysts were used for the investigation on technological condition, the effects of catalysts dosage, reaction pressure and temperature on hydrogenolysis of sucrose to C2~C3 polyhydric alcohols were studied. The presence of Ni is very common in most of the catalysts used for this process. The presence of Mo and Cu promotes the activity of Ni when supported on kieselguhr. It was found that the suitable 22wt% Ni catalysts dosage was 3.2 g, when 20g sucrose were added. The yield of C2~C3 polyhydric alcohols increased as with the increase of pressure, With the temperature increasing, the hydrogenolysis rate of sorbitol also increased rapidly. The yield of products was enhanced to the highest at 150℃. When the temperature was above 160℃,the severe hydrogenolysis of sorbitol could decrease the yield of desired products. And the proper agitating speed of reactor is 900 r/min. Orthogonal experimental design were taken to optimize the reaction conditions.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Aliphatic alcohol > Polyols
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