PROCEDIMENTO PER PREPARARE BUTANDIOLI

摘要

1493154 Butanediols KURARAY & CO Ltd 27 Aug 1975 [30 Aug 1974] 35360/75 Heading C2C A process for preparing butanediols comprises reacting allyl alcohol with carbon monoxide and hydrogen, the molar ratio of CO/H 2 being within the range of 1/10 to 4/1, in a waterimmiscible organic solvent in the presence, as a catalyst, of a rhodium compound, which is soluble in the organic solvent and stable to water and insoluble in it, of the general formula wherein m is 0, 1, 2, 3 or 4, n is 0, 1, 2, 3 or 4, q is 0, 1 or 3 and r is 1 or 2 with the proviso that m, n and q are not equal to 0 at the same time; X represents a hydrogen atom, an electronegative group, or when in the free state, an anionic substituent; and L is a trisubstituted phosphine, trisubstituted stibine or trisubstituted arsine expressed by the formula YRR1R11 in which Y represents a phosphorus atom, antimony atom or arsenic atom and R, R1 and R11 independently from each other, represent an aryl group containing 6 to 20 carbon atoms, an alkyl group containing 1 to 12 carbon atoms, a cyclo-alkyl group containing from 6 to 12 carbon atoms, an aralkyl group containing 7 to 24 carbon atoms, a monoarylamino group containing 6 to 20 carbon atoms, a monoalkylamino group containing 1 to 12 carbon atoms, a monoaralkylamino group containing 7 to 24 carbon atoms, diarylamino group with the aryl group containing 6 to 20 carbon atoms, a dialkylamino group with the alkyl group containing 1 to 12 carbon atoms or a diaralkylamino group with the aralkyl group containing 7 to 24 carbon atoms, at a temperature of 0‹ to 200‹ C. and a pressure of 1 to 50 kg./cm.2 (absolute), to hydroformylate it to the corresponding aldehydes, extracting the resulting hydroformylation mixture with water to separate it into an organic solvent phase containing the catalyst and an aqueous phase containing the aldehydes, the separated organic solvent phase containing the catalyst being recycled for reuse in the next cycle of the hydroformylation reaction, and hydrogenating the aldehydes in the aqueous phase to form butanediols using for example Raney nickel as catalyst.