US 8,025,773 B2Granted

System for extending the range of hydrocarbon feeds in gas crackers

AssigneeExxonMobil Chemical Patents Inc.

InventorsJames N. McCoy, Walter F. Filupeit, Barrington M. Hammond, David J. Duhon, Mark A. Rooney, Robert A. D. Strack, John R. Messinger

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Abstract

In a system for thermal cracking gaseous feedstocks, the system including a gas cracker for producing an effluent comprising olefins, at least one transfer line exchanger for the recovery of process energy from the effluent and a water quench tower system, a process for extending the range of system feedstocks to include liquid feedstocks that yield tar is provided. The process includes the steps of injecting a first quench fluid downstream of the at least one transfer line exchanger to quench the process effluent comprising olefins, separating in a separation vessel a cracked product and a first byproduct stream comprising tar from the quenched effluent, directing the separated cracked product to the water quench tower system and quenching the separated cracked product with a second quench fluid to produce a cracked gas effluent for recovery and a second byproduct stream comprising tar. An apparatus for cracking a liquid hydrocarbon feedstock that yield tar is also provided.

Claims22

Dependent claims

An apparatus for cracking a liquid hydrocarbon feedstock in a thermal gas cracker, to produce a cracked effluent from the cracker that includes tar, the apparatus comprising:

(a) a thermal gas cracker for receiving a liquid hydrocarbon feed stream, the cracker comprising a convection section and a radiant section to produce a process effluent comprising olefins;
(b) a primary transfer line exchanger (TLE) to receive the cracked effluent from the cracker, for the recovery of process energy from the cracked effluent;
(c) a first separator system for receiving the cracked effluent from the TLE and separating the cracked effluent into a first separator byproduct stream comprising tar and a first separator product stream;
(d) a second separator system to receive the first separator product stream and separate the first separator product stream into an overhead cracked gas effluent for recovery and a second separator byproduct stream comprising tar;
and
(f) a tar solvation system for receiving the second byproduct stream, said tar solvation system in fluid communication with and downstream of the second separator system for receiving the second separator byproduct stream comprising tar.

3 more elements

Dependencies are inferred from the claim text.