The different effect between tetra-n-butyltitanate and sulfuric acid was studied.
分别研究了浓硫酸和钛酸四正丁酯两种催化剂对产率的影响;
2
The said titanate is one of the kinds such as methyl titanate, ethyl titanate, butyltitanate, titanic chloride and titanoxy sulfate.
所述钛盐是指钛酸甲酯、钛酸乙酯、钛酸四丁酯、四氯化钛、硫酸氧钛中的任一种;
3
It is found that in the presence of butyltitanate or stannous oxalate as a polycondensation catalyst the carboxyl content is not always on the increase in all high vacuum stage.