Process for liquid phase hydrogenation
AssigneeSynfuels International, Inc.
InventorsMarvin M. Johnson, Edward R. Peterson, Sean C. Gattis
Life of this patent
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Abstract
A process for the liquid phase selective hydrogenation of alkynes to alkenes with high selectivity to alkenes relative to alkanes, high alkyne conversion, and sustained catalytic activity comprising a reactant comprising an alkyne and a non-hydrocarbon solvent/absorbent, contacting the reactant stream with a hydrogen-containing stream in the presence of a supported, promoted, Group VIII catalyst, removing the solvent/absorbent, and recovering the alkene product.
Claims56
A selective hydrogenation process, comprising:
- preparing a reactant stream comprising an alkyne absorbed in a liquid absorbent;
- contacting the reactant stream with a selective hydrogenation catalyst in the presence of a gas stream comprising hydrogen and greater than 2000 ppm carbon monoxide, at hydrogenation conditions to provide a product stream;
- separating the absorbent from the product stream to recover a product.
A selective hydrogenation process, comprising:
- contacting an alkyne absorbed in a liquid absorbent with a catalyst in the presence of a hydrogen-containing stream at conditions conducive to selective hydrogenation to produce a product stream comprising a product alkene, wherein the hydrogen-containing stream further comprises greater than 2,000 ppm carbon monoxide;
- separating the liquid absorbent from the product stream to substantially recover the product alkene.
A process for the selective hydrogenation of alkynes comprising:
- absorbing one or more alkynes in a liquid absorbent to provide a reactant stream;
- contacting said reactant stream with a catalyst in the presence of a hydrogen-containing gas stream, comprising greater than 2000 ppm carbon monoxide, at hydrogenation conditions to produce a product stream comprising the alkene analogs of the one or more alkynes;
- separating said alkene analogs from said product stream.
A process for the selective hydrogenation of acetylenic compounds, comprising:
- absorbing one or more acetylenic compounds in a liquid polar non-hydrocarbon absorbent to provide a reactant stream;
- contacting the reactant stream with a hydrogenation catalyst in the presence of a gas stream comprising hydrogen and greater than 2000 ppm carbon monoxide, under selective hydrogenation conditions to provide a product stream, wherein said product stream comprises the ethylenic compounds corresponding to the one or more acetylenic compounds in the reactant stream;
- separating the absorbent from the product stream.
A process for the selective hydrogenation of alkynes, comprising:
- preparing a liquid reactant stream comprising between 0.5 wt-% and 10 wt-% C2H2 dissolved in n-methyl-2-pyrrolidone;
- contacting the reactant stream and a gas stream comprising a mixture of H2 and greater than 2000 ppm CO in continuous flow with a catalyst at a feed ratio of H2:C2H2 of from about 1:1 to about 5:1 at selective hydrogenation reaction conditions to produce a product stream,
- separating substantially all of the n-methyl-2-pyrrolidone from the product stream;
- recovering a product comprising C2H4.
A process for the selective hydrogenation of alkynes, comprising:
- absorbing an alkyne compound in a liquid polar non-hydrocarbon absorbent to provide a reactant stream;
- contacting the reactant stream with a selective hydrogenation catalyst in the presence of a gas stream comprising hydrogen and greater than 2000 ppm carbon monoxide;
- hydrogenating at least a portion of the alkyne compound to provide a product stream comprising an alkene compound corresponding to the alkyne compound;
- substantially separating the absorbent from the product stream;
- recovering a product comprising the alkene compound.
Dependencies are inferred from the claim text.