Process for preparing pyrrolidine of the formula I
by reacting 1,4-butanediol (BDO) of the formula II
with ammonia in the presence of hydrogen and a supported, metal-containing catalyst, wherein the catalytically active mass of the catalyst, prior to its reduction with hydrogen, comprises oxygen-containing compounds of aluminum, copper, nickel and cobalt and in the range from 0.2 to 5.0% by weight of oxygen-containing compounds of tin, calculated as SnO, and the reaction is carried out in the liquid phase at an absolute pressure in the range from 160 to 220 bar, a temperature in the range from 160 to 230° C., using ammonia in a molar ratio to BDO used of from 5 to 50 and in the presence of 1.0 to 4.5% by weight of hydrogen, based on the amount of BDO used.
通过在
氢气和含
金属的支持型催化剂存在下,通过将分子式为II的
1,4-丁二醇(
BDO)与
氨反应来制备分子式为I的
吡咯烷的过程,其中催化剂的催化活性质量,在用氢还原之前,包含氧化铝、
铜、
镍和
钴的氧化物化合物,以及在0.2%至5.0%的范围内含有氧化
锡的氧化物化合物,按SnO计算,并且反应在液相中进行,在绝对压力为160至220巴的范围内,温度在160至230°C的范围内,使用
氨与使用的
BDO的摩尔比为5至50,并且在使用的
BDO量基础上,存在1.0%至4.5%的
氢气。