| 摘要 |
<p>A method and apparatus for the thermal cracking and fractionation of petroleum heavy gas oil and simultaneously heavy crude oil feedstock below atmospheric pressure. The feedstock 25 is fed to a factionator 11 after heat exchange with distillate fractions withdrawn from the fractionator. A heavy gas oil fraction 33 is withdrawn from the fractionator, fed to a heater 12 and subsequently to the top of a thermal cracking reactor 13, whilst the reduced or heavy crude stock is fed to the mid-section of the reactor. The cracked products are quenched with the feedstock (in line 27) and fed to the bottom flash zone 21 of the fractionator. The process may also be applied to an existing crude oil topping still with modifications and operated above atmospheric pressure.</p> |
