Exxonmobil Chemical Patents Inc.

David Jon Duhon

James N McCoy

John R Messinger

Mark A Rooney

John Ernest Asplin

Barrington M Hammond

Robert David Strack

Walter F Filupeit

Cor F Van Egmond

Cornelis F Van Egmond

Robert A Strack

Robert A D Strack

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 a primary transfer line exchanger to quench the process effluent comprising olefins, separating in a first separation vessel a cracked product and a first byproduct stream comprising tar from the quenched effluent, directing the separated cracked product to a 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 carrying out such process is also provided.

Controlling tar by quenching cracked effluent from a liquid fed gas cracker

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.

System for extending the range of hydrocarbon feeds in gas crackers

A process and apparatus for recovering product from reactor effluent of a reactor for a hydrocarbon feedstream is disclosed. An indigenous Cstream is used as lean oil in a demethanizer, which facilitates significant cost and operational savings. Cbottoms from a downstream depropanizer is used as lean oil recycle.

Process and apparatus for recovering olefins

System and method for extending the range of hydrocarbon feeds in gas crackers

The present invention relates to a process and apparatus for recovering product from reactor effluent of a reactor for a hydrocarbon feedstream. An indigenous Cstream is used as lean oil in a demethanizer, which facilitates significant cost and operational savings. Cbottoms from a downstream depropanizer is used as lean oil recycle.

The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetylene, methyl acetylene, propadiene, methane, hydrogen, carbon monoxide, carbon dioxide and C+ components. In one embodiment, the initial effluent stream is provided from a methanol-to-olefin reaction system. It has been discovered that an efficient separation of these components is realized when DME is partially removed in a first separation step comprising methanol and water washing steps, followed by separation of the remaining components in additional separation steps.

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Kingwood, TX, United States of America

David Jon Duhon