Oligomerization of ethylene to liquid transportation fuels with post synthesis treated zsm-5 catalyst
AssigneePhillips 66 Company
InventorsJianhua Yao, Bruce B. Randolph
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Abstract
A process for post synthesis treatment of ZSM-5 catalyst for converting ethylene to liquid fuel products providing substantially improved catalyst life. The treatment comprises either a base treatment, an acid treatment or a two-step treatment where one is with an acid and the other is with a base. The base treatment is provided by a weak sodium hydroxide such as less than 1 Molar concentration. The acid treatment is stronger acid where, for example, a hydrogen chloride solution at greater than 2 Molar concentration is used.
Claims8
Oligomerizing ethylene to transportation fuel products in a reactor with a fixed bed of ZSM-5 catalyst that is essentially free of catalyst metals other than silica and alumina wherein the ZSM-5 catalyst has been provided with post synthesis treatment of a base wash to resist coke formation in the zeolite crystallites and extend catalyst life wherein the oligomerizing is conducted at a pressure between 0 psig and 800 psig, a temperature of between 260° C. and 420° C., and a gas hourly space velocity of between 1000 and 5000 inverse hours and wherein at least 85% of the ethylene is converted.
Dependencies are inferred from the claim text.