山梨醇电化学合成技术的改进(Ⅱ)──恒电流电解

Improvment Technology of Electrchemical Synthesis of Sorbitol(Ⅱ) ──Constant Current Electrolysis

研究了阴极材料及工艺条件对葡萄糖电解还原的影响。结果表明，添加剂a（NH4Cl）能有效地降低葡萄糖还原的过电势，抑制析氢，从而使产率大幅度地提高。最佳电解条件为含0．25mol·L(-1)添加剂a的1．0mol·L(-1)葡萄糖溶液，pH为8～9，Zn－Hg阴极，电流密度0．4A·dm(-2)，温度32℃。在该条件下通常可得94％的产率。

A study was made of the effect of cathode material and various operating conditions on the elec- troboc reduchon of glucose. The findings suggest that the addihve a (NH4Cl) is effective on dropping the overpotential of glucose reduchon, checking hydrogen evolutinn, and increasing the output of sor bitol. The optmum operatmg conditions were as follows: 1. 0 mol· L(1) glucose solution with 0. 25 mol ·L(-1) addihve a, pH = 8 - 9, Zn - Hg cathode, temperatUre 32℃, current density 0. 4 A· dm(-2). Under these conditions, the yield of soIbitol was generally 94%.