无机盐活化的淀粉与碳酸二甲酯的甲基化反应

Methylation of starch by dimethyl carbonate under the activation of inorganic salt

摘要:

采用NH4Cl、NaCl强化淀粉的活化处理过程，并通过与四丁基溴化铵协同作用来促进淀粉与碳酸二甲酯的甲基化反应。在m(starch):m(NH4Cl):m(NaCl):m(K2CO3):m(C16H36NBr)=10:5:5:10:1和v(C2H5OH): v(H2O):v((H3CO)2CO)=30:10:150配比下，淀粉在55℃下活化1h，继而在80℃恒温反应12h，产物的甲氧基含量达5.9%。

Abstract:

Inorganic salts, like ammonium chloride(NH4Cl) and sodium chloride(NaCl), was used to intensify activation of starch, and further to improve methylation of starch with dimethyl carbonate by the help of tetrabutyl ammonium bromide (TBAB).It is showed that the methoxyl content of methyl starch gets to 5.9%, by mass ratio m (starch): m (NH4Cl): m (NaCl): m (K2CO3): m (TBAB)=10:5:5:10:1 and volume ratio v(C2H5OH):v(H2O):v(( H3CO)2CO)=30:10:150, at 55℃ for 1h activation , and 80℃ for 12h reaction.