Process for preparing a cyclic tertiary methylamine of the formula I
where
A is a C
4
-alkylene group, a C
5
-alkylene group or a —(CH
2
)
2
—B—(CH
2
)
2
—group, where B is oxygen (O) or an N—R
1
radical and R
1
is C
1
-C
5
-alkyl, aryl or C
5
-C
7
-cycloalkyl,
wherein
an amino alcohol II from the group consisting of 1,4-aminobutanol, 1,5-aminopentanol, aminodiglycol (ADG) or aminoethylethanolamine of the formula IIa
where R
1
is as defined above or is hydrogen (H), in which case R
1
═CH
3
in the amine I, is reacted with methanol in a reactor at a temperature in the range from 150 to 270° C. in the liquid phase in the presence of a copper-comprising heterogeneous catalyst.
制备公式I的环状三级甲基胺的方法,其中A为C4-烯基、C5-烯基或—(
CH2)2—B—( )2—基团,其中B为氧(O)或N—R1基团,R1为C1-C5-烷基、芳基或C5-C7-环烷基;其中将来自1,4-
氨基
丁醇、1,5-
氨基
戊醇、
氨基二醇(ADG)或
氨基乙基
乙醇胺IIa公式的
氨基醇II与
甲醇在反应器中于150至270°C的温度范围内,在液相中,在含有
铜的异质催化剂存在下反应。