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Epoxidation process

  • US 10,040,055 B2
  • Filed: 06/02/2016
  • Issued: 08/07/2018
  • Est. Priority Date: 06/02/2015
  • Status: Active Grant
First Claim
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1. A method of improving the performance of a silver-based epoxidation catalyst comprising a carrier comprising at least 80 percent alpha alumina and having a pore volume from 0.3 mL/g to 1.2 mL/g, a surface area from 0.3 m2/g to 3.0 m2/g, and a pore architecture that provides at least one of a tortuosity of 7 or less, a constriction of 4 or less and a permeability of 30 mdarcys or greater;

  • a catalytic amount of silver disposed on and/or in said carrier; and

    a promoting amount of one or more promoters disposed on said carrier;

    which method further comprises;

    initiating an epoxidation reaction by reacting a feed gas composition containing ethylene and oxygen present in a ratio of from about 2.5;

    1 to about 12;

    1, in the presence of the silver-based epoxidation catalyst at a temperature of about 200°

    C. to about 230°

    C.; and

    subsequently increasing the temperature either stepwise or continuously.

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