Systems and methods for wet air oxidation regeneration of catalysts with ion exchange
AssigneesVirent, Inc., Johnson Matthey Davy Technologies Limited
InventorsColin Anson, Edgar Steenwinkel, Matt van Straten, Ian Campbell
Life of this patent
Estimating the term…
Abstract
The present disclosure provides systems and methods for regenerating a hydrogenation catalyst with reduced water consumption and/or shortened overall regeneration time. The method can include contacting a fouled hydrogenation catalyst with a first flushing medium comprising water and a gaseous phase comprising oxygen and optionally a second flushing medium comprising water and a gaseous phase comprising at least 90% nitrogen by volume. The method can further include treating the effluents of the flushing mediums by ion exchange resin to remove impurities in the effluents.
Claims20
A method for hydrogenating biomass, the method comprising:
- catalytically reacting a feedstock stream comprising water and an oxygenated hydrocarbon (C2+O1+) with hydrogen in the presence of a hydrogenation catalyst for a hydrogenation duration to produce a first hydrogenated product stream and a fouled hydrogenation catalyst;
- subjecting the fouled hydrogenation catalyst to a regeneration cycle to produce a regenerated hydrogenation catalyst, the regeneration cycle comprising:
- (a-i) contacting the catalyst with a first flushing medium for an air-treatment duration to produce an air-treated catalyst and a first effluent, wherein the first flushing medium comprises, measured at 25° C. and 1 atmospheric pressure, liquid water and a gaseous phase comprising oxygen;
- (b) contacting at least a portion of the first effluent with an ion exchange resin to produce a first IX-treated effluent;
- and
- (c) recycling the first IX-treated effluent to step (a-i) for inclusion in the first flushing medium, and
- catalytically reacting the feedstock stream with hydrogen in the presence of the regenerated hydrogenation catalyst to further produce a second hydrogenated product stream.
A method for producing a regenerated hydrogenation catalyst from a fouled hydrogenation catalyst, the method comprising:
- catalytically reacting a feedstock stream having at least one sulfur-containing impurity in the presence of a hydrogenation catalyst to produce the fouled hydrogenation catalyst, wherein the fouled hydrogenation catalyst comprises an amount of sulfur derived from the at least one sulfur-containing impurity of the feedstock stream, and
- subjecting the fouled hydrogenation catalyst to a regeneration cycle to produce the regenerated hydrogenation catalyst, the regeneration cycle comprising:
- (a-i) contacting the catalyst with a first flushing medium for an air-treatment duration to produce an air-treated catalyst and a first effluent, wherein the first flushing medium comprises, measured at 25° C. and 1 atmospheric pressure, liquid water and a gaseous phase comprising oxygen;
- (b) contacting at least a portion of the first effluent with an anionic ion exchange resin to produce a first IX-treated effluent;
- and
- (c) recycling the first IX-treated effluent to step (a-i) for inclusion in the first flushing medium,
- wherein the amount of sulfur in the regenerated hydrogenation catalyst is reduced relative to the fouled hydrogenation catalyst.
Dependencies are inferred from the claim text.