Exxonmobil Chemical Patents Inc.

John Ernest Asplin

David Jon Duhon

Richard Charles Stell

Robert David Strack

John R Messinger

Dane Clark Grenoble

Cor F Van Egmond

Cornelis F Van Egmond

Dane C Grenoble

A method is disclosed for treating gaseous effluent from a hydrocarbon pyrolysis unit to provide steam cracked tar of reduced asphaltene and toluene insolubles content. The method is suitable for preparing reduced viscosity tar useful as a fuel blending stock, or feedstock for producing carbon black, while reducing or eliminating the need for externally sourced lighter aromatics additives to meet viscosity specifications. The method comprises drawing steam cracked tar from a separation vessel, e.g., a primary fractionator or tar knock-out drum, cooling the tar, and returning it to the separation vessel to effect lower overall tar temperatures within the separation vessel, in order to reduce viscosity increasing condensation reactions. An apparatus for carrying out the method is also provided.

Method for processing hydrocarbon pyrolysis effluent

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

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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Singapore, Singapore

John Ernest Asplin