Propylene and ethylene are the major raw chemical materials for organic chemical industry, which are mainly derived from hydrocarbon steam cracking process.
丙烯、乙烯是重要的基本有机化工原料，且二者的市场需求日益旺盛，其主要来源是蒸汽裂解装置。
2
Technologies for propylene production by using C4 and C5 fractions as feedstock coming from steam cracker and refineries are reviewed.
利用蒸汽裂解和炼油工艺的碳四和碳五馏分生产丙烯是增产丙烯的一条重要途径。
3
Butadiene is found as a byproduct in the steam cracking of naphtha and gas oil to make ethylene and propylene.