Catalyst regeneration process
AssigneeLyondell Chemical Technology, L.P.
InventorsRoger A. Grey, Mark P. Kaminsky
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Abstract
Used noble metal-containing titanium zeolite catalysts, that have been employed in the liquid-phase epoxidation of olefins with hydrogen and oxygen in the presence of a buffer, are regenerated by heating the used catalyst at a temperature of at least 250° C. in the presence of a oxygen-containing gas stream, followed by reduction at a temperature of at least 20° C. in the presence of a hydrogen-containing gas stream to form a reactivated catalyst.
Claims18
A method of regenerating a used noble metal-containing titanium zeolite catalyst comprising the steps of:
- (a) heating the used catalyst at a temperature of at least 250° C. in the presence of a gas stream comprised of oxygen to obtain a heated product;
- and
- (b) reducing the heated product at a temperature of at least 20° C. in the presence of a gas stream comprised of hydrogen to form a reactivated catalyst;
- wherein the noble metal-containing titanium zeolite catalyst was used to catalyze the epoxidation of an olefin with hydrogen and oxygen in the presence of at least one reaction solvent and at least one buffer.
A method of regenerating a used noble metal-containing titanium zeolite catalyst comprising the steps of:
- (a) washing the used catalyst with a wash solvent;
- (b) heating the washed catalyst at a temperature of at least 300° C. in the presence of a gas stream comprised of oxygen to obtain a heated product;
- and
- (c) reducing the heated product of step (b) at a temperature of at least 30° C. in the presence of a gas stream comprised of hydrogen to form a reactivated catalyst;
- wherein the used noble metal-containing titanium zeolite catalyst was used to catalyze the epoxidation of an olefin with hydrogen and oxygen in the presence of at least one reaction solvent and at least one buffer.
Dependencies are inferred from the claim text.