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    发明专利
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    公开(公告)号：DE1185590B

    公开(公告)日：1965-01-21

    申请号：DEB0070019

    申请日：1962-12-18

    Applicant: BASF AG

    Inventor： POEHLER DR GUENTER ,  WEGERICH DR ANTON ,  GOEHRE DR OTTO ,  GIEHNE DIPL-ING HELLMUT

    IPC: B01J8/06 ,  B01J19/24 ,  C07C45/00

    Abstract: A catalytic dehydrogenation reactor, e.g. for dehydrogenating paraffins and naphthenes comprises a plurality of tubes each having a diameter of at least 70 mm. arranged in a reactor so as to leave a central free space and baffles arranged perpendicularly to the tubes and alternately at the reactor wall and in the central space to deflect a gaseous heating medium which is passed between the tubes in the same direction as reactants are passed through the tubes. The ratio of diameter to length of the tubes may be 12-17 : 1000 with a diameter of 70-120 mm. and a length of 5-12 m. The free space in the centre of the reactor may be 7-25% of the total cross-sectional area. The baffles are alternate central circular baffles occupying 25-60% of the total cross-sectional area extending into the section containing tubes and outer annular baffles occupying 50-75% of the total area. The baffles, particularly in the tubed area, may have perforations, e.g. 3-10 mm. in diameter. The tubes may be spaced 15-60 mm. from each other. Heating medium is preferably introduced by an annular duct 2 surrounding the reactor. The medium is divided into two streams by a baffle 9 which flow in opposite directions round the reactor and enter the reactor through slots which increase in size in the direction of flow. The heating medium is withdrawn by a similar duct 5 and is reheated and re-used. The ducts 2 and 5 may have a cross-sectional area 5-20% that of the reactor.ALSO: A catalytic dehydrogenation reactor e.g. for converting alcohols to ketones comprises a plurality of tubes each having a diameter of at least 70 mm. arranged in a reactor so as to leave a central free space and baffles arranged perpendicularly to the tubes and alternately at the reactor wall and in the central space to deflect a gaseous heating medium which is passed between the tubes in the same direction as reactants are passed through the tubes. The ratio of diameter to length of the tubes may be 12-17 : 1,000 with a diameter of 70-120 mm. and a length of 5-12 cm. The free space in the centre of the reactor may be 7-25% of the total cross sectional area. In Fig. 1 the baffles 4 are alternate central circular baffles occupying 25-60% of the total cross-sectional area extending into the section containing tubes and outer annular baffles occupying 50-75% of the total area. The baffles, particularly in the tubed area, may have perforations, e.g. 3-10 mm. in diameter. The tubes may be spaced 15-60 mm. from each other. Heating medium is preferably introduced by an annular duct 2 surrounding the reactor. The medium is divided into two streams by a baffle 9 which flow in opposite directions round the reactor and enter the reactor through slots which increase in size in the direction of flow. The heating medium is withdrawn by a similar duct 5 and is reheated and reused. The ducts 2 and 5 may have a cross-sectional area 5-20% that of the reactor. In examples cyclohexanol is converted to cyclohexanone and sec.-butanol to methyl ethyl ketone.

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