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    11.
    发明专利
    未知

    公开(公告)号：DE10344283A1

    公开(公告)日：2005-04-21

    申请号：DE10344283

    申请日：2003-09-24

    Applicant: BASF AG

    Inventor： REUTEMANN WERNER ,  WAMBSGANS ROLF ,  POPLOW FRANK ,  WEBER THEODOR ,  ROS KARL-HEINZ ,  JULIUS MANFRED

    IPC: C07C209/16 ,  C07C211/04 ,  C07C209/24

    Abstract: The invention relates to a process for preparing methylamines by gas-phase reaction of methanol and ammonia as starting materials at a pressure in the range from 15 to 30 bar in the presence of heterogeneous catalyst. The starting materials are vaporized in one or more heat exchangers (1, 2, 3), superheated to produce a feed gas stream and subsequently fed into a reactor (4), with the mixing of the starting materials being able to be carried out in the feed stream to one of the heat exchangers (1, 2, 3) or at any desired position in a heat exchanger (1, 2, 3). A product gas stream comprising monomethylamine, dimethylamine and trimethylamine and also reaction by-products is taken off from the reactor (4). To control the reactor inlet temperature of the starting materials to a temperature in the range from 360° C. to 370° C., all or some of the feed gas stream or the product gas stream is passed through an adjustable valve (5) in order to vary the pressure and thus the condensation temperature.

    13.
    发明专利
    未知

    公开(公告)号：DE502004004109D1

    公开(公告)日：2007-07-26

    申请号：DE502004004109

    申请日：2004-09-24

    Applicant: BASF AG

    Inventor： REUTEMANN WERNER ,  WEBER THEODOR ,  ROSS KARL-HEINZ ,  JULIUS MANFRED

    IPC: C07C209/86 ,  C07C209/16 ,  C07C209/90 ,  C07C211/04

    Abstract: The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream ( 10 ) which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine, trimethylamine, ammonia and methanol as components, where ammonia is separated off by pure distillation in a first column ( 1 ), the remaining components of the product stream obtained as bottoms ( 12 ) are fed to a second column ( 2 ). Trimethylamine ( 14 ) is separated off in the second column ( 2 ) by extractive distillation with introduction of water. The further components of the product stream obtained as bottoms ( 15 ) from the second column ( 2 ) are fed to a third column ( 3 ), in which monomethylamine and dimethylamine are separated off at the top. The monomethylamine and dimethylamine are separated by distillation in a fourth column ( 4 ). To avoid corrosion alkali metal hydroxide is added to the second or third column ( 3 ).

    14.
    发明专利
    未知

    公开(公告)号：BRPI0413792A

    公开(公告)日：2006-11-07

    申请号：BRPI0413792

    申请日：2004-09-24

    Applicant: BASF AG

    Inventor： REUTEMANN WERNER ,  WAMBSGANSS ROLF ,  POPLOW FRANK ,  WEBER THEODOR ,  ROSS KARL-HEINZ ,  JULIUS MANFRED

    IPC: C07C209/16 ,  C07C211/04

    Abstract: The invention relates to a process for preparing methylamines by gas-phase reaction of methanol and ammonia as starting materials at a pressure in the range from 15 to 30 bar in the presence of heterogeneous catalyst. The starting materials are vaporized in one or more heat exchangers (1, 2, 3), superheated to produce a feed gas stream and subsequently fed into a reactor (4), with the mixing of the starting materials being able to be carried out in the feed stream to one of the heat exchangers (1, 2, 3) or at any desired position in a heat exchanger (1, 2, 3). A product gas stream comprising monomethylamine, dimethylamine and trimethylamine and also reaction by-products is taken off from the reactor (4). To control the reactor inlet temperature of the starting materials to a temperature in the range from 360° C. to 370° C., all or some of the feed gas stream or the product gas stream is passed through an adjustable valve (5) in order to vary the pressure and thus the condensation temperature.

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