1.Pyrolysis and liquification of polypropylene(PP) were studied by using molten ZnCl2 as heat carrier.

1.以熔融作为载体,对聚丙烯(PP)的解液进行研究。

2.Propylene,the common petroleum gas,is subject to gasification under heating and liquification under pressure.

2.丙烯是易气、压易液的常用石油气。