Hydrogen donor cracking with donor soaking of pitch
First Claim
1. In a hydrogen donor diluent cracking process in which a heavy hydrocarbonaceous material is thermally cracked in a cracking coil in the presence of hydrogen donor solvent, and in which spent donor is separated from cracked products, rehydrogenated and recycled to the cracking step, the improvement wherein at least part of the pitch fraction from the cracked products is heat soaked in a soaking tank separate from said cracking coil in the presence of hydrogenated donor solvent for a time and at a temperature sufficient to substantially reduce the amount of material in said pitch which is insoluble in pentane and said heat-soaked pitch is returned to said cracking coil.
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Accused Products
Abstract
A hydrogen donor diluent cracking process in which the pitch fraction from the cracking step is heat soaked in the presence of hydrogen donor solvent and then returned to the cracking coil.
51 Citations
6 Claims
- 1. In a hydrogen donor diluent cracking process in which a heavy hydrocarbonaceous material is thermally cracked in a cracking coil in the presence of hydrogen donor solvent, and in which spent donor is separated from cracked products, rehydrogenated and recycled to the cracking step, the improvement wherein at least part of the pitch fraction from the cracked products is heat soaked in a soaking tank separate from said cracking coil in the presence of hydrogenated donor solvent for a time and at a temperature sufficient to substantially reduce the amount of material in said pitch which is insoluble in pentane and said heat-soaked pitch is returned to said cracking coil.
Specification