Extraction rectify of methanol and dimethyl carbonate azeotropic mixture .
甲醇与碳酸二甲酯恒沸物的萃取精馏。
The difference is dimethyl benzyl ammonium .
不同在于乙烷苯甲基铵。
A grafted copolymer of pp-g-an was prepared by means of solution polymerization in high pressure using dcp as initiator and dimethyl benzene as solvent .
