| 摘要 |
<p>The invention provides a moderate pressure hydrocracking process in which a highly aromatic, substantially dealkylated feedstock is processed directly to high octane gasoline by hydrocracking said feedstock in a hydrocracking zone (18) containing a monofunctional acidic cracking catalyst, preferably comprising a large pore size, crystalline alumino-silicate zeolite hydrocracking catalyst such as zeolite Y. The feedstock is preferably a light cycle oil obtained from a catalytic cracking zone (10) wherein said feedstock has an aromatic content of at least 50, usually at least 60 percent and an API gravity not more than 25. The hydrocracking typically operates at 4240-6900 kPa (600-1000 psig) at moderate to high conversion levels to maximize the production of monocyclic aromatics which provide the requisite octane value to the product gasoline.</p> |
