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。
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。
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。
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