| 摘要 |
1,217,775. 1,4-Butanediol. G.A.F. CORP. 11 March, 1968 [17 March, 1967], No. 11828/68. Heading C2C. 1,4-Butanediol is prepared by catalytic hydrogenation of an aqueous solution of 1,4- butynediol of 35-40% concentration at a pH of 6À5-7À5, with hydrogen at a temperature of 50-60‹ C. and a pressure of 200-300 p.s.i.g. in the presence of a nickel catalyst, preferably a Raney nickel catalyst, removal of the catalyst by filtration and treatment of the filtrate with hydrogen at a temperature of 120-140‹ C. and a pressure of 2000-3000 p.s.i.g. in the presence of a silica gel catalyst carrying thereon 14-16% by weight of nickel, 4-6% by weight of copper and 0À5-1 % by weight of manganese, followed by the recovery of 1,4-butanediol by distillation. |
