申请人:——
公开号:US20020128513A1
公开(公告)日:2002-09-12
Secondary amines of the formula (II)
(X—CH
2
—)
2
NH (II)
where
X is a C
1-20
-alkyl, C
2-20
-alkenyl or C
3-8
-cycloalkyl group which may be unsubstituted or substituted by C
1-20
-alkyl, C
3-8
-cycloalkyl, C
4-20
-alkylcycloalkyl, C
4-20
-cycloalkylalkyl, C
2-20
-alkoxyalkyl, C
6-14
-aryl, C
7-20
-alkylaryl, C
7-20
-aralkyl, C
1-20
-alkoxy, hydroxy, C
1-20
-hydroxyalkyl, amino, C
1-20
-alkylamino, C
2-20
-dialkylamino, C
2-12
-alkenylamino, C
3-8
-cycloalkylamino, arylamino, diarylamino, aryl-C
1-8
-alkylamino, halogen, mercapto, C
2-20
-alkenyloxy, C
3-8
-cycloalkoxy, aryloxy and/or C
2-8
-alkoxycarbonyl,
are prepared by reacting nitriles of the formula (III)
X—CN (III)
with hydrogen at from 20 to 250° C. and pressures of from 60 to 350 bar in the presence of an Rh-containing catalyst comprising from 0.1 to 5% by weight, based on the total weight of the catalyst, of Rh on a support to give mixtures of primary amines of the formula (I)
X—CH
2
—NH
2
(I)
and secondary amines of the formula (II)
(X—CH
2
—)
2
NH (II)
and returning at least part of the primary amines separated from the mixtures obtained to the reaction.
化学方程式中的次要胺的公式(II)(X—CH2—)2NH (II),其中X是C1-20-烷基、C2-20-烯基或C3-8-环烷基,可以未取代或被C1-20-烷基、C3-8-环烷基、C4-20-烷基环烷基、C4-20-环烷基烷基、C2-20-烷氧基烷基、C6-14-芳基、C7-20-烷基芳基、C7-20-芳基烷基、C1-20-烷氧基、羟基、C1-20-羟基烷基、氨基、C1-20-烷基氨基、C2-20-二烷基氨基、C2-12-烯基氨基、C3-8-环烷基氨基、芳基氨基、二芳基胺基、芳基-C1-8-烷基氨基、卤素、巯基、C2-20-烯氧基、C3-8-环烷氧基、芳氧基和/或C2-8-烷氧羰基,通过在20至250°C和60至350巴的压力下,在含有0.1至5%重量Rh的催化剂的存在下,将公式(III)X—CN (III)的腈与氢反应制备而成,所述催化剂基于总重量的0.1至5%的Rh载于载体上,以给出公式(I)X—CH2—NH2(I)的一次胺和公式(II)(X—CH2—)2NH (II)的二次胺的混合物,并将至少从所得混合物中分离的一部分一次胺返回反应中。