Co-production of vinyl acetate and ethyl acetate
View Patent ↗A method of co-producing vinyl acetate and ethyl acetate includes: (a) reacting ethylene, acetic acid and oxygen to form vinyl acetate and at least a minor amount of ethyl acetate; (b) providing a crude product stream containing the vinyl acetate and ethyl acetate of step (a) and acetic acid to a distillation tower; (c) separating the crude product stream into: (i) a vinyl acetate product stream enriched in vinyl acetate with respect to the crude product stream; (ii) an acid recycle stream enriched in acetic acid with respect to the crude product stream; (iii) a mixed sidestream containing vinyl acetate and ethyl acetate, the mixed sidestream being enriched in ethyl acetate with respect to the vinyl acetate product stream; and (d) hydrogenating vinyl acetate in the mixed sidestream to provide an ethyl acetate product stream.
1. A method of co-producing vinyl acetate and ethyl acetate comprising: (a) reacting ethylene, acetic acid and oxygen to form vinyl acetate and at least a minor amount of ethyl acetate; (b) providing a crude product stream containing the vinyl acetate and ethyl acetate of step (a) and acetic acid to a distillation tower; (c) separating the crude product stream into: (i) a vinyl acetate product stream enriched in vinyl acetate with respect to the crude product stream; (ii) an acid recycle stream enriched in acetic acid with respect to the crude product stream; (iii) a mixed sidestream containing vinyl acetate and ethyl acetate, the mixed sidestream being enriched in ethyl acetate with respect to the vinyl acetate product stream; and (d) hydrogenating vinyl acetate in the mixed sidestream to provide an ethyl acetate product stream, wherein the vinyl acetate in the mixed sidestream is catalytically hydrogenated.
2. The method according to claim 1 , wherein vinyl acetate in the mixed sidestream is catalytically hydrogenated using a Raney Nickel catalyst.
3. The method according to claim 1 , wherein vinyl acetate in the mixed sidestream is catalytically hydrogenated using a palladium/carbon catalyst.
4. The method according to claim 1 , wherein the step of hydrogenating vinyl acetate in the mixed sidestream is carried out in a CSTR.
5. The method according to claim 1 , wherein the step of hydrogenating vinyl acetate in the mixed sidestream is carried out in a fixed bed reactor.
6. The method according to claim 1 , further comprising the step of distilling the ethyl acetate product stream.
7. The method according to claim 6 , wherein the step of distilling the ethyl acetate product stream is carried out using a single distillation tower.
8. The method according to claim 1 , wherein the vinyl acetate product stream of step (c) is substantially an azeotropic mixture of water and vinyl acetate.
9. The method according to claim 1 , wherein the vinyl acetate product stream contains less than about 0.025 weight percent ethyl acetate.
10. A method of co-producing vinyl acetate and ethyl acetate comprising: (a) reacting ethylene, acetic acid and oxygen to form vinyl acetate and at least a minor amount of ethyl acetate; (b) providing a crude product stream containing the vinyl acetate and ethyl acetate of step (a) and acetic acid to a distillation tower; (c) separating the crude product stream into: (i) a vinyl acetate product stream enriched in vinyl acetate with respect to the crude product stream; (ii) an acid recycle stream enriched in acetic acid with respect to the crude product stream; (iii) a mixed sidestream containing vinyl acetate and ethyl acetate, the mixed sidestream being enriched in ethyl acetate with respect to the vinyl acetate product stream; and (d) hydrogenating vinyl acetate in the mixed sidestream to provide an ethyl acetate product stream, wherein the ratio of mass flow rates of vinyl acetate in the product stream to the flow rate in the mixed sidestream is from about 10:1 to about 2:1.
11. The method according to claim 10 , wherein the ratio of mass flow rates of vinyl acetate in the product stream to the flow rate in the mixed sidestream is from about 6:1 to about 3:1.
12. The method according to claim 1 , wherein the step of reacting ethylene, acetic acid and oxygen is carried out in the liquid phase.
13. The method according to claim 1 , wherein the step of reacting ethylene, acetic acid and oxygen is carried out in the vapor phase.
14. The method according to claim 13 , wherein the reaction between ethylene, acetic acid and oxygen to form vinyl acetate is catalyzed with a palladium catalyst.
15. The method according to claim 13 , wherein the reaction between ethylene, acetic acid and oxygen to form vinyl acetate is catalyzed with a palladium/gold catalyst.