间接电合成法制取双醛淀粉

Indirect Electrosynthesis of Double Aldehyde Starch

提出了一种合成双醛淀粉（ＤＡＳ） 的新方法间接电合成法。在阳离子交换膜做隔膜的两室电解槽中，铅板做阳极，铁板做阴极，把淀粉和碘酸钠的酸性水溶液直接加入阳极室电解，即合成ＤＡＳ。优选电解条件：阳极电解液中ｃ（ＮａＩＯ３） ＝ ０－０５ ｍｏｌ／Ｌ，ｃ（Ｈ２ＳＯ４） ＝ ０－１ ｍｏｌ／Ｌ，ｗ（ 淀粉） ＝ ７ ％ ；阴极液为ｃ（Ｈ２ＳＯ４） ＝ ０－１ ｍｏｌ／Ｌ的稀硫酸；电流密度２ Ａ／ｄｍ２ 。在此条件下电流效率大于０－５ 。

In this paper,a new method for synthesizing double aldehyde starch(DAS),the indirect electrosynthesis,was advanced.In a double chambered electrolytic cell with ion exchange membrane as the diaphragm and with Pb anode and Fe cathode,acidic aqueous solution of starch and NaIO\-3 was poured into the anode chamber and electrolyzed to give DAS.The optimum conditions of electrolysis were as follows:in the anodic solution,c(NaIO\-3)=0 05 mol/L,c(H\-2SO\-4)=0 1 mol/L,w(starch)=7%;in the cathodic solution,c(H\-2SO\-4)=0 1 mol/L;electric current density=2 A/dm\+2.Under these conditions,the current efficiency was over 50%.