The transalkylation of polyethylbenzene, mainly diethylbenzene and triethylbenzene, with benzene catalyzed by tungstophosphoric acid has been studied in stirred autoclave.
The basic processing techniques of modern Pu'er tea include seven main steps: fresh leaf picking, spreading fresh leaves for cooling, fixation, kneading, sundrying, pile fermentation, autoclaving and desiccating.
为催化剂,研究
苯与多乙苯的
移反应,多乙苯主要是二乙苯和三乙苯。
级英语短文
要步骤：鲜叶采摘、铺鲜叶冷却、固定、揉捏、晒干、渥堆、
和干燥。
