填充床电催化反应器制备甘露醇研究

Synthesis of mannitol by packed-bed electrocatalytic reactor

自制了DSA电极为阳极,纯镍板为阴极馈电极,阳离子交换膜为隔膜,阴极室填充雷尼镍催化剂的填充床电化学反应器。在雷尼镍填充床电化学反应器中电还原果糖合成甘露醇,考察了雷尼镍用量、阴极馈电极电流强度、果糖起始浓度、槽电压、搅拌速度、支持电解质等因素对电还原反应的影响。结果表明:在无支持电解质存在下,当果糖起始浓度为2.0mol/L,阴极室中雷尼镍填充质量与果糖质量比为3,阴极馈电极电流强度为7A,通电量为2F/mol,槽电压为6V,搅拌速度150r/min,果糖的转化率可达97.68%,采用填充床电化学反应器制备甘露醇,反应效率高,可简化后续产品的提纯过程。

A self-made packed-bed electrocatalytic reactor with dimensionally stable anodes （DSA） as anode, Raney Ni powder as cathode and Ni plank as feed electrode was designed. The synthesis process of mannitol in the Raney Ni packed-bed electrocatalytic reactor was investigated. The effects of the quantity of Raney Ni catalyst, current intensity of feed electrode, fructose initial concentration, cell voltage, stirring speed, supporting electrolyte on the fructose conversion were studied. The result shows that under the selected conditions that initiative concentration of fructose is 2.0 mol/L, the mass ratio of Raney Ni to fructose is 3, the current intensity of the feed electrode is 7 A, the electric quantity is 2F/mol, the cell voltage is 6 V, the stirring speed is 150 r/min, and without supporting electrolyte, the conversion of fructose is about 97.68%. As a high-efficient mannitol synthesis, this process becomes a shortcut for purifying the downstream products.