Preparation of vinyl acetate
AssigneeEastman Chemical Company
InventorsGerald Charles Tustin, Joseph Robert Zoeller, Leslie Sharon Depew
Life of this patent
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Abstract
This invention pertains to the preparation of vinyl acetate by contacting a mixture of hydrogen and ketene with a heterogeneous catalyst containing a transition metal to produce acetaldehyde, which is then reacted with ketene in the presence of an acid catalyst to produce vinyl acetate.
Claims21
A process for preparing vinyl acetate comprising the steps of 1) contacting, in a first contact zone, hydrogen and ketene gases with a catalyst comprising a metal selected from the elements of Groups 9 and 10 of the periodic table;
- 2) recovering a product comprising acetaldehyde from the first contact zone;
- 3) contacting, in a second contact zone, a mixture of ketene and the acetaldehyde recovered from the first contact zone with an acid catalyst;
- and 4) recovering a product comprising vinyl acetate from the second contact zone.
A process for preparing vinyl acetate comprising the steps of 1) contacting, at a temperature of about 50.degree. to about 200.degree. C. and a pressure of about 0.1 to about 20 bars absolute, hydrogen and ketene gases and, optionally, a non-reactive diluent gas with a supported or unsupported palladium catalyst in a first contact zone;
- 2) recovering a product comprising acetaldehyde from the first contact zone;
- 3) contacting, at a temperature of about 85.degree. to about 200.degree. C. and at a pressure of about 0.05 to about 20 bars absolute, a mixture of ketene and the acetaldehyde recovered from the first contact zone and, optionally, a non-reactive diluent gas with an acid catalyst in a second contact zone;
- and 4) recovering a product comprising vinyl acetate from the second contact zone.
A continuous process for producing vinyl acetate comprising the steps of:
- 1) continuously feeding a gas comprising ketene, hydrogen and, optionally, a non-reactive diluent gas to a first contact zone containing one or more beds of a catalytically-effective, hydrogenation catalyst comprising a metal selected from the elements of Groups 9 and 10 of the periodic table;
- 2) continuously recovering a product gas comprising acetaldehyde from the first contact zone;
- 3) continuously feeding a mixture of ketene, the acetaldehyde recovered in the first contact zone and, optionally, a non-reactive diluent gas to a second contact zone containing an acid catalyst comprising a Bronsted acid and, optionally, a solvent;
- and 4) continuously removing a product gas comprising vinyl acetate from the second contact zone.
A continuous process for producing vinyl acetate comprising the steps of:
- 1) continuously feeding a gas comprising ketene, hydrogen and, optionally, a non-reactive diluent gas to a first contact zone, at a temperature of about 50.degree. to about 200.degree. C. and at a pressure of about 0.1 to about 20 bars absolute, containing one or more beds of a catalytically effective, hydrogenation catalyst selected from the elements of Groups 9 and 10 of the periodic table in the presence of a non-reactive liquid;
- 2) continuously recovering a product comprising acetaldehyde from the first contact zone;
- 3) continuously feeding a gas comprising ketene, the acetaldehyde recovered from the first contact zone and, optionally, a non-reactive diluent gas to a second contact zone, at a temperature of about 85.degree. to about 200.degree. C. and at a pressure of about 0.05 to about 20 bars absolute, containing an acid catalyst comprising a Bronsted acid and, optionally, a solvent;
- and 4) continuously recovering a product comprising vinyl acetate from the second contact zone.
A process for producing vinyl acetate comprising the steps of 1) contacting ketene and hydrogen gases with a hydrogenation catalyst comprising a metal selected from the elements of Groups 9 and 10 of the periodic table and an acid catalyst in a contact zone;
- and 2) removing a product comprising vinyl acetate from the contact zone.
Dependencies are inferred from the claim text.