Abstract
The effect of different types of boat (nickel, copper and porcelain) on the pyrolysis of vacuum gas oil in the first stage of the two-stage pyrolysis technique has been examined. The best yield of total unsaturated hydrocarbons was obtained by using a nickel boat. The ethylene pyrolyzate yield is 40.2 wt.%, using a nickel boat, and the severity function of the second stage is 1384. The ethylene pyrolyzate yield is found to be directly proportional to the second-stage severity function. However, the propylene and butylene yields are found to be inversely proportional to the second-stage severity function. The maximum yield of unsaturated hydrocarbons is 65.9 wt.%.
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