Regeneration of oligomerisation catalysts and their use
AssigneeExxonMobil Chemical Patents Inc.
InventorsJohn Stephen Godsmark, Georges Marie Karel Mathys, Hans Karel Theresia Goris, Roger Eijkhoudt, Stephen Harold Brown
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Abstract
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.
Claims5
A process for the regeneration of a catalyst selected from ZSM-22;
- ZSM-57, or mixtures thereof wherein the catalyst has been used for oligomerizing a C4 stream to produce a product comprising octane, the process comprising the following steps:
- i) heating the catalyst to a temperature in the range from 300° C. to 450° C. under an inert dry atmosphere;
- and
- ii) heating the catalyst to a temperature in the range from 450° C. to 500° C. in a dry oxygen-containing atmosphere to produce a regenerated catalyst;
- wherein the regenerated catalyst has an octane selectivity of at least 75 wt %.
Dependencies are inferred from the claim text.