中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

6 records (took 0.018 seconds)

    Improvements in the separation of liquid mixtures into their components
    1.
    发明专利
    Improvements in the separation of liquid mixtures into their components 未知

    公开(公告)号：GB900457A

    公开(公告)日：1962-07-04

    申请号：GB4199358

    申请日：1958-12-30

    Applicant: BASF AG

    Inventor： POEHLER GUENTER ,  GIEHNE HELLMUT ,  WEGERICH ANTON ,  GOEHRE OTTO

    IPC: B01D1/06 ,  B01D3/14 ,  B01D3/32

    Abstract: A liquid mixture, which contains material of low volatility, is separated into fractions by introducing it through pipe 1 into distillation column 3 the base of which is connected, by pipes 7 and 9, to a tubular evaporator 8; the base of the column and/or the tubular evaporator being also connected to a film-evaporator 12. Non-volatile material is withdrawn from the film-evaporator via pipe 13; and the volatile fraction is removed from the head of the column via dephlegmator 6 and pipe 10. In the embodiment shown, the vapour withdrawn from the film-evaporator via pipe 14 is condensed; and the condensate is introduced via pipe 22 into the column with fresh feed. The film-evaporator may be maintained at low pressure by a vacuum pump connected to pipe 19. The level of the liquid in the base of the column is maintained constant by valve 15. The operation is preferably conducted so that the bottoms product contains 40 to 60% of the low-volatile material. The process is suitable for fractionating the crude products of organic syntheses; and the heat of reaction may be used to preheat in heat-exchanger 2 the feed to the column. There are five examples, which relate to the production of cyclohexanol, dicyclohexylamine, dichlorbutane, adiponitrile, and beta-naphthol.

    Process for the production of pure cyclohexanone
    3.
    发明专利
    Process for the production of pure cyclohexanone 未知

    公开(公告)号：GB914425A

    公开(公告)日：1963-01-02

    申请号：GB4421960

    申请日：1960-12-23

    Applicant: BASF AG

    Inventor： POEHLER GUENTER ,  WEGERICH ANTON ,  GIEHNE HELLMUT ,  GOEHRE OTTO

    Abstract: Cyclohexanone is obtained from crude cyclohexanol by evaporating the bulk of the latter in a first vaporization zone at 140-180 DEG C., supplying the liquid residue to a second vaporization zone wherein it is vaporized as far as possible by a suitably correlated adjustment of temperature and pressure, returning the vapours from the second to the first zone (alternatively having condensed the vapours to liquid and returning this to the first zone), the vapours preheated to 250-400 DEG C. being then passed over a dehydrogenation catalyst at a velocity of 50-100 cm./sec., the residence period at the catalyst being 4-12 seconds. The catalyst is a heavy metal of Group Ib, IIb, VIa or VIII or an oxide or carbonate or mixtures thereof; copper supported on pumice or ferric oxide is specified.

    Tube reactors
    5.
    发明专利
    Tube reactors 未知

    公开(公告)号：GB1004234A

    公开(公告)日：1965-09-15

    申请号：GB4888263

    申请日：1963-12-11

    Applicant: BASF AG

    Inventor： POEHLER GUENTER ,  WEGERICH ANTON ,  GOEHRE OTTO ,  GIEHNE 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.

Patent Agency Ranking