Exxonmobil Chemical Patents Inc.

Roger Eijkhoudt

Stephen Harold Brown

Georges M K Mathys

Jihad Mohammed Dakka

Raphael Frans Caers

John Stephen Godsmark

Hans K T Goris

Georges Marie Karel Mathys

Marc P H Puttemans

Machteld Maria Mertens

Jane C Cheng

Jon E Stanat

Allen David Godwin

Ramzi Yanni Saleh

Johan Adriaan Martens

Hubertus Joseph Beckers

David Wayne Turner

Charles Morris Yarbrough

Stephen Wayne Beadle

Carolyn B Duncan

Raman Ravishankar

Ernest E Green

Hans Karel Theresia Goris

Igor V Mishin

Cesar M Cheng Guajardo

Stephen Brown

Hans Goris

Deactivation of a zeolite catalyst during its use to catalyse the oligomerisation of olefins, is often believed to be a result of the formation of high boiling polymers as by-products. These by-products can remain on the catalyst and undergo further conversion to higher molecular weight polymers, which resemble heavy tars and in some cases even have the appearance of coke-like material. These materials can coat the catalyst particles and plug pores in the catalyst, thereby causing catalyst deactivation. The invention relates to an improved method for regenerating such a catalyst.

Regeneration of oligomerisation catalysts and their use

Water reacts on molecular sieve catalysts used in oligomerization reactions and forms oxygenated compounds, in particular organic acids that may cause corrosion problems downstream of the reactor, in particular in distillation tower overhead systems and downstream thereof. A lowering of the presence of water in the feed prior to contacting thereof with the molecular sieve brings a significant reduction in corrosion downstream. At the same time, it has a significant beneficial effect on catalyst activity and brings a significant extension of catalyst life. Lowering water in the feed is particularly effective when organic nitrogen-containing Lewis bases are present in the feed, even at low levels.

Low corrosion in zeolite oligomerisation

Sulphur-containing olefinic feedstocks are oligomerized over zeolite catalysts.

Oligomerization and catalysts therefor

A selectivated molecular sieve, e.g., ZSM-22 or ZSM-23, is used as olefin oligomerization catalyst to provide product, e.g., octenes and dodecenes from butene, having a low degree of branching and hindered double bonds.

Oligomerization of olefins

Process for the oligomerization of olefins

A process for oligomerising alkenes having from 3 to 6 carbon atoms which comprises contacting a feedstock comprising a) one or several alkenes having x carbon atoms, and, b) optionally, one or several alkenes having y carbon atoms, x and y being different, with a catalyst containing a zeolite of the MFS structure type, under conditions to obtain selectively oligomeric product containing predominant amounts of certain oligomers. The process is carried out at a temperature comprised between 125 and 175&#xb0; C. when the feedstock contains only alkenes with 3 carbon atoms and between 140 and 240&#xb0; C., preferably between 140 and 200&#xb0; C. when the feedstock contains comprises at least one alkene with 4 or more carbon atoms.

Alkene oligomerization process

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GC Breda, Netherlands

Roger Eijkhoudt