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1·Butadiene is found as a byproduct in the steam cracking of naphtha and gas oil to make ethylene and propylene.

丁二烯是石脑油和瓦斯油的蒸汽裂解的副产物。

2·The unconverted oil was a good feedstock for steam cracking and its ethylene yield was 2%-3% higher than that of Daqing AGO feedstock.

蒸汽裂解试验显示尾油馏分是很好的蒸汽裂解制乙烯原料，其乙烯收率较大庆ago高2 ~ 3个百分点。

3·A new process for producing roofing asphalt from petroleum residua by steam cracking and condensation has been studied in the laboratory.

在实验室中研究了一种从石油残渣油制取建筑沥青的新工艺——水蒸汽裂解缩合。

4·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。

5·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。

6·As the steam cracking feedstocks, the ethylene yield of the desorption oil increased 6.5 percentage compared to the condensate oil in the similar conditions.

脱附油作为蒸汽裂解制乙烯原料，与凝析油相比，在相同的工艺条件下乙烯收率可提高6.5个百分点。

7·Developing trend of world ethylene industry was analyzed. Recent development of steam cracking and progress of other new ethylene technologies were introduced.

分析了世界乙烯工业的发展趋势，介绍了管式炉蒸汽裂解制乙烯技术的进展状况，以及各种乙烯生产新技术的研究进展情况。

8·Naphtha is the main feedstock for steam cracking process, therefore its property directly influences the yields of main cracking products and the operation cycle of cracking furnace.

石脑油作为蒸汽裂解工艺的主要原料，其性质直接影响裂解主要产品收率和裂解炉操作周期。

9·The technology of separating normal paraffins from the naphtha through the adsorption process was studied to optimize the steam cracking feedstock and utilize the naphtha resource properly.

为了优化乙烯裂解原料并合理利用石脑油资源，将石脑油中的正构烷烃进行分离。

10·This paper illustrates the allowance and hazard of the main impurities in cracking feedstock and diluting steam, and provides specific control methods.

文中列举了裂解原料与稀释蒸汽中主要杂质的允许值及其危害，并给出了具体的控制手段。