petroleum cracking process 石油裂化 ; 石油裂炼法
petroleum cracking gas 石油裂解气
petroleum cracking 石油裂解
steel tubes for petroleum cracking 石油裂化用钢管
petroleum cracking method 石油裂解方法
petroleum cracking residue 汽油裂解残油
It was formerly made by the action of water on calcium carbide and is now made from cracking petroleum products.
以前由水与碳化钙作用制造。现在由石油产品裂解生产。
The olefins, such as ethylene and propylene, are formed from petroleum gas or from cracking of larger hydrocarbons. Ethylene is used to make polyethylene e.g.
烯烃主要是来自石油气或大分子的碳氢化合物裂解，如乙烯，丙烯。
The most important route to produce these unsaturated hydrocarbons is by steam cracking, using principally petroleum gases or naphtha as feedstock.
生产这种不饱和烃类最重要的路线是靠蒸汽裂解，主要以石油气体和石脑油作原料。
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