A process for preparing formic acid by reaction of carbon dioxide (
1
) with hydrogen (
2
) in a hydrogenation reactor (I) in the presence of
a catalyst comprising an element of group 8, 9 or 10 of the Periodic Table,
a tertiary amine comprising at least 12 carbon atoms per molecule and
a polar solvent comprising one or more monoalcohols selected from among methanol, ethanol, propanols and butanols and also water,
to form formic acid/amine adducts as intermediates which are subsequently thermally dissociated, with work-up of the output (
3
) from the hydrogenation reactor (I) in a plurality of process steps, where
a tertiary amine-comprising stream (
13
) from the work-up is used as selective solvent for the catalyst, is proposed.
一种制备
甲酸的方法,通过在
氢化反应器(I)中,在周期表第8、9或10族元素组成的
催化剂存在下,将
二氧化碳(1)与
氢(2)反应,以及包含每个分子至少12个
碳原子的三级胺和包括
甲醇、
乙醇、
丙醇和
丁醇中的一种或多种单醇以及
水的极性溶剂,形成
甲酸/胺加合物作为
中间体,随后进行热解离,并通过多个工艺步骤处理来自
氢化反应器(I)的产物(3),其中工艺步骤中使用来自工艺处理的三级胺组成流(13)作为
催化剂的选择性溶剂。