公开(公告)号：DE10139453A1

公开(公告)日：2003-02-20

申请号：DE10139453

申请日：2001-08-10

Applicant: BASF AG

Inventor： GROSMANN CHRISTOPH ,  WAGNER RUPERT ,  RANDOLF HUGO

IPC: B01D53/14

Abstract: In a process to reduce the acid content in a fluid flow, the gas is brought into contact with an aqueous absorbent containing methyl-diethanolamine and piperazine. The total amine content is in the range 20-70% by weight of the absorption agent. The ratio by weight of methyl-diethanolamine to piperazine is in the range 9-15. The process uses an absorbent in which the total amine content is in the range of 45-55% by weight. The ratio of methyl-diethanolamine to piperazine is in the range of 13-15. The absorption process is conducted in two sequential stages. The process further incorporates a regeneration phase consisting of one or more expansion phases in which acid is expelled from the absorbent and the absorbent re-used. An Independent claim is included for an aqueous absorption agent containing methyl-diethanolamine and piperazine.

公开(公告)号：DE102005058417A1

公开(公告)日：2007-06-14

申请号：DE102005058417

申请日：2005-12-07

Applicant: BASF AG

Inventor： RANDOLF HUGO ,  DAHMEN KIRSTEN ,  HUBER SABINE

IPC: C07C209/48 ,  C07C211/51

Abstract: Preparation of xylylenediamine by continuously hydrogenating phthalodinitrile over a heterogeneous catalyst in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor inlet, comprises mixing phthalodinitrile by a mixing device with a stream of liquid ammonia (stream a) and a further stream that is removed at least as a sub-stream from the circulation stream around the hydrogenation reactor (stream b), or mixing of streams a and b, and conducting the resulting liquid mixture into the hydrogenation reactor. Preparation of xylylenediamine by continuously hydrogenating phthalodinitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor inlet (circulation mode), comprises mixing phthalodinitrile, as melt or in solid form, by a mixing device with a stream of liquid ammonia (stream a) and a further stream that is drawn off at least as a sub-stream from the circulation stream around the hydrogenation reactor (stream b), or mixing of streams a and b, and conducting the resulting liquid mixture into the hydrogenation reactor.