| 摘要 |
1441047 1,4-Hexadiene E I DU PONT DE NEMOURS & CO 29 July 1974 [25 Oct 1973] 33436/74 Heading C5E A continuous process for recycling solvent and catalyst during the preparation of 1,4-hexadiene which comprises (a) co-reacting ethylene and 1,3-butadiene in the presence of a rhodium catalyst, e.g. RhCl 3 in a one-phase liquid reaction zone containing a water-soluble poly- (oxyethylene)-ether solvent having a molecular weight of at least 134, at 25-150‹ C., and a pressure of from atmospheric to 2000 p.s.i.g., (b) passing the resulting liquid effluent from the reaction zone to a flasher operated at subatmospheric pressure to remove 1,4-hexadiene, (c) recirculating a major portion of residual liquid effluent from the flasher to the reaction zone, while at the same time, circulating the balance of residual liquid effluent constituting 0À25- 10% by weight of the flasher effluent and containing poly(oxyethylene)ether solvent, rhodium catalyst and high-boiling hydrocarbon by-products having C 8 -C 12 fractions to a vessel, (d) mixing said balance with at least 30% by volume water in order to form an organic phase containing said high-boiling hydrocarbons and rhodium catalyst and an aqueous phase containing poly(oxyethylene)ether solvent and rhodium catalyst (e) separating the aqueous phase from the organic phase, and (f) circulating either directly or after removal of water the poly(oxyethylene)ether solvent and rhodium catalyst from the aqueous phase to the reaction zone for reuse in the process. |
