Integrated process for the production of viny acetate from acetic acid via ethy acetate

A process for the production of vinyl acetate from acetic acid comprising:

• a. contacting a feed stream containing acetic acid and hydrogen at an elevated temperature with a suitable hydrogenation catalyst consisting essentially of a hydrogenation catalyst metal and an oxidic support to form a first gaseous product stream comprising ethyl acetate;
• said hydrogenation catalyst metal being chosen from the group consisting of:
• i. platinum and copper;
• ii. platinum and cobalt;
• iii. palladium and cobalt;
• iv. palladium and molybdenum;
• and
• v. platinum and molybdenum;
• wherein the oxidic support is chosen from the group consisting of silica, alumina, silica-alumina, calcium silicate, zirconia, and combinations thereof
• b. enriching said first gaseous product stream with ethyl acetate to at least 50 mole percent;
• c. contacting in a second reaction zone said enriched first gaseous product stream obtained in step (b) at an elevated temperature with a suitable cracking catalyst to form a second gaseous product comprising a mixture of ethylene and acetic acid;
• d. contacting in a third reaction zone said second gaseous product obtained in step (c) in combination with a second feed stream comprising molecular oxygen and optionally additional amounts of acetic acid in the presence of a catalyst to form a third gaseous product stream comprising vinyl acetate;
• and
• e. separating the vinyl acetate from said third gaseous product stream.

A process for the production of vinyl acetate from acetic acid comprising:

• a. contacting in a first reaction zone a feed stream containing acetic acid and hydrogen at an elevated temperature with a suitable hydrogenating catalyst to form a first gaseous product containing ethyl acetate, said hydrogenating catalyst being disposed on a suitable catalyst support and consisting essentially of a first metal chosen from the group consisting of:
• i. about 0.5 weight percent to about 1 weight percent of platinum;
• ii. about 0.5 weight percent to about 1 weight palladium;
• and
• iii. combinations thereof;
• and
• a second metal chosen from the group consisting of:
• i. 2.5 weight percent to about 5 weight percent of copper;
• ii. 2.5 weight percent to about 5 weight percent cobalt;
• and
• iii. combinations thereof
• b. enriching said first gaseous product stream with ethyl acetate to at least 50 mole percent;
• c. contacting in a second reaction zone said enriched first gaseous product obtained in step (b) at an elevated temperature with a cracking catalyst chosen from perfluorosulfonic acid resin, H-mordenite or ZSM-5, to form a second gaseous product comprising a mixture of ethylene and acetic acid;
• d. contacting in a third reaction zone said gaseous product stream obtained in step (c) in combination with a second feed stream comprising molecular oxygen and optionally additional amounts of acetic acid in the presence of a catalyst to form a second gaseous product stream comprising vinyl acetate;
• and
• e. separating the vinyl acetate from said second gaseous product stream.

A process for the production of vinyl acetate from acetic acid comprising:

• a. contacting in a first reaction zone a feed stream containing acetic acid and hydrogen at an elevated temperature with a catalyst consisting essentially of about 0.5 weight percent to about 1 weight percent of palladium and 2.5 weight percent to about 5 weight percent of cobalt on a catalyst support comprising a zeolite having a pore diameter of at least about 0.6 nm.;
• b. enriching said first gaseous product stream with ethyl acetate to at least 50 mole percent;
• c. contacting in a second reaction zone said enriched first gaseous product obtained in step (b) at an elevated temperature with perfluorosulfonic acid resin to form a second gaseous product comprising a mixture of ethylene and acetic acid;
• d. contacting in a third reaction zone said second gaseous product stream obtained in step (c) in combination with a second feed stream comprising molecular oxygen and optionally additional amounts of acetic acid in the presence of a supported palladium catalyst to form a third gaseous product stream comprising vinyl acetate;
• and
• e. separating the vinyl acetate from said third gaseous product stream.

A process for the production of vinyl acetate from acetic acid comprising:

• a. contacting a feed stream containing acetic acid and hydrogen at an elevated temperature with a suitable hydrogenation/cracking catalyst to form a first gaseous product stream comprising ethyl acetate, ethylene and acetic acid;
• said combined hydrogenation/cracking catalyst being chosen from the group consisting of:
• palladium and cobalt;
• platinum and copper;
• and
• palladium and molybdenum;
• on a support comprising a zeolite having a pore diameter of at least about 0.6 nm;
• b. enriching said first gaseous product stream with ethyl acetate to at least 50 mole percent;
• c. contacting in a second reaction zone said enriched first gaseous product stream obtained in step (b) at an elevated temperature with a suitable cracking catalyst to form a second gaseous product comprising a mixture of ethylene and acetic acid;
• d. contacting in a third reaction zone said second gaseous product obtained in step (c) in combination with a second feed stream comprising molecular oxygen and optionally additional amounts of acetic acid in the presence of a catalyst to form a third gaseous product stream comprising vinyl acetate;
• and
• e. separating the vinyl acetate from said third gaseous product stream.

A process for the production of vinyl acetate from acetic acid comprising:

• a. contacting in a first reaction zone a feed stream containing acetic acid and hydrogen at an elevated temperature with a suitable combined hydrogenation/cracking catalyst to form a first gaseous product containing ethyl acetate, ethylene and acetic acid, said hydrogenating catalyst being disposed on a suitable catalyst support and consisting essentially of about 0.5 weight percent to about 1 weight palladium;
• and 2.5 weight percent to about 5 weight percent of a second metal chosen from the group consisting of cobalt, molybdenum and combinations thereof on a support comprising zeolite having a pore diameter above about 0.6 nm.;
• b. enriching said first gaseous product stream with ethyl acetate to at least 50 mole percent;
• c. contacting in a second reaction zone said enriched first gaseous product obtained in step (b) at an elevated temperature with a cracking catalyst chosen from perfluorosulfonic acid resin, H-mordenite or ZSM-5, to form a second gaseous product comprising a mixture of ethylene and acetic acid;
• d. contacting in a third reaction zone said gaseous product stream obtained in step (c) in combination with a second feed stream comprising molecular oxygen and optionally additional amounts of acetic acid in the presence of a catalyst to form a second gaseous product stream comprising vinyl acetate;
• and
• e. separating the vinyl acetate from said second gaseous product stream.

A process for the production of vinyl acetate from acetic acid comprising:

• a. contacting in a first reaction zone a feed stream containing acetic acid and hydrogen at an elevated temperature with a catalyst containing about 0.5 weight percent to about 1 weight percent of palladium and 2.5 weight percent to about 5 weight percent of a second metal chosen from the group consisting of cobalt, molybdenum and combinations thereof on a support comprising a zeolite catalyst having a pore diameter above about 0.6 nm;
• b. enriching said first gaseous product stream with ethyl acetate to at least 50 mole percent;
• c. contacting in a second reaction zone said enriched first gaseous product obtained in step (b) at an elevated temperature with perfluorosulfonic acid resin to form a second gaseous product comprising a mixture of ethylene and acetic acid;
• d. contacting in a third reaction zone said second gaseous product stream obtained in step (c) in combination with a second feed stream comprising molecular oxygen and optionally additional amounts of acetic acid in the presence of a supported palladium catalyst to form a third gaseous product stream comprising vinyl acetate;
• and
• e. separating the vinyl acetate from said third gaseous product stream.