| 摘要 |
<p>A process for catalytic converting hydrocarbons feedstock to produce prolifically both diesel oil and liquefied gas in the riser or fluidized bed reactor, which comprising: (a) feeding gasoline feedstock, optional pre-lifting media and catalytic cracking catalyst from reactor bottom and contacting them at underpart of the reactor to form a gas-oil mixture containing a great deal of liquefied gas; (b) contacting the gas-oil mixture and the catalytic cracking catalyst from step (a) with the conventional catalytic cracking stock which is added from at least two different height positions above the lower portion of the reactor in the zone above the lower portion of reactor, and forming a gas-oil mixture which contains a great deal of diesel oil; (c) separating the gas-oil mixture from step (b) into required liquefied gas, gasoline and diesel oil product in the fractionating system, and returning optionally a part of or all heavy cycle oil and slurry oil to the zone above of the lower portion of the reactor for recracking; and (d) regenerating the catalyst in the regenerator, and recycling regenerated catalyst to the reactor. The present process can increase the yield of liquefied gas and diesel oil, reduce the sulfur and olefin content, and increase the octane number of gasoline. This process can be carried out without changing largely the present catalytic cracking unit.</p> |
