| 摘要 |
Process for converting a hydrocarbon feed which process comprises (a) catalytically cracking the feed, (b) separating the mixture obtained in step (a) into spent catalyst and hydrocarbon product, (c) separating the hydrocarbon product of step (b) into two or more fractions, (d) further catalytically cracking at least one of the fractions obtained in step (c), (e) separating the mixture obtained in step (d) into used catalyst and hydrocarbon product, (f) subjecting one or more fractions obtained in step (c) and hydrocarbon product of step (e) to separation such as to obtain a gas and one or more liquid fractions, (g) increasing the pressure of the gas obtained in step (f), (h) separating hydrocarbons comprising 3 carbon atoms from the product of step (g) to obtain propane-lean product, and (i) separating the propane-lean product obtained in step (h) into a fraction containing hydrocarbons comprising 4 carbon atoms, a fraction containing hydrocarbons comprising 5 or 6 carbon atoms, and a heavy fraction, in which process the fraction containing hydrocarbons comprising 5 or 6 carbon atoms obtained in step (i) is sent as feed to step (d). |
