Exxonmobil Chemical Patents Inc.

David R Lumgair, Jr

Keith Holroyd Kuechler

James Richardson Lattner

Nicolas P Coute

Cor F Van Egmond

Jeffrey Alan Kabin

Michael Peter Nicoletti

Marc L DeChellis

James H Beech

Gary F Janda

Russell D Sellen

Minquan Cheng

Josef Kunkel

Klaus Muller

Gerhard Lauermann

Jeffrey J Phillips

Roland Walzl

Wilried Borgmann

The present invention is directed toward reducing corrosion in a methanol-to-olefin (MTO) effluent processing system, and particularly in the condensate removal system thereof, by injecting a neutralization agent into one or more target regions of the MTO effluent processing system. The neutralization agent ensures that any localized condensation in the MTO effluent processing system, particularly in the condensate removal system, occurs under basic conditions and that any acidic condensable components are neutralized. The invention is also directed to monitoring corrosion in an MTO effluent processing system and to monitoring the pH of localized corrosion sites in order to ensure proper neutralization of any acidic condensation formed therein.

Minimizing corrosion in a methanol-to-olefin effluent processing system

The present invention is a process for removing alkynes and/or dienes from an olefin product stream withdrawn from an oxygenate-to-olefins reactor. The process comprises hydrogenating a first olefin stream that has alkynes and/or dienes in the presence of excess hydrogen and a first hydrogenation catalyst. The hydrogenation of the first olefin stream produces a second olefin stream that has unreacted hydrogen. The second olefin stream is contacted with a second hydrogenation catalyst producing a third olefin stream. The third olefin stream has low levels of hydrogen and alkynes and/or dienes.

Process for removal of alkynes and/or dienes from an olefin stream

This invention is directed to a method of removing dimethyl ether from an olefin stream. Dimethyl ether is removed from the olefin stream by first separating the olefin stream into a first stream comprising dimethyl ether and lighter boiling point compounds, and a second stream comprising C+ olefin and higher boiling point hydrocarbons. The dimethyl ether is then separated from the first stream using extractive distillation.

Method of separating dimethyl ether from an olefin stream

This invention is directed to a method of removing acetaldehyde, COand/or water from an ethylene and/or propylene containing stream. In this invention, acetaldehyde and C+ olefins are substantially removed from the ethylene and/or propylene containing stream. The stream is then acid gas treated. The ethylene and/or propylene streams which are separated and recovered according to this invention can be further processed, for example, to make polymers such as polyethylene and polypropylene.

Method of removing oxygenate contaminants from an olefin stream

Disclosed is a system of making an olefin derivative from a dilute olefin feed. Dilute olefin is sent to an olefin reaction unit to form an olefin derivative product. The olefin derivative product is recovered from the reaction unit while a vent stream is also removed. Olefin is separated from the vent stream, and the olefin is sent to the olefin reaction unit for additional processing.

Production of olefin derivatives

Growing community of inventors

Craddockville, VA, United States of America

David R Lumgair, Jr