Exxonmobil Chemical Patents Inc.

David B Looney

Gary David Mohr

Robert G Tinger

Todd E Detjen

Mark A Nierode

David R Slim

May-Ru Chen

Keng-Fai Kuan

Mark D Thompson

Grant H Schumacher

Mary M Rethwisch

Disclosed are processes for converting an alkyne to an olefin comprising feeding a molecular-oxygen-containing gas stream into a converting zone of an alkyne converter along with an alkyn-containing feed mixture comprising hydrocarbons and molecular hydrogen to contact the converting catalyst. The converting catalyst can be regenerated online as a result.

Processes for converting alkyne to olefin

A method of reducing the amount of carbon monoxide present during the metal reduction step of start-up, thus, maintaining metal dispersion and improving the metal reduction and catalyst yields. Carbon monoxide formation is minimized during the start-up procedure and during the initial catalyst dryout phase in a hydrogen-containing atmosphere, gas is purged from the reactor system, either continuously at constant pressure or by a series of pressure/depressure cycles, to remove carbon monoxide. The purging is conducted at temperatures of about 30-500&#xb0; C. and pressures of about &#x2212;90-5,000 kPa(g) (&#x2212;0.9-50 bar(g)). In this temperature range, carbon monoxide absorbed to the surface of the metal will desorb into the hydrogen-containing atmosphere and can be removed from the system along with carbon monoxide present in the atmosphere through the purging.

Method of improving metal-impregnated catalyst performance

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Houston, TX, United States of America

David B Looney