中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

43 records (took 0.02 seconds)

    Process for the production of pure cyclohexanone
    12.
    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.

    A process for the production of formaldehyde
    16.
    发明专利
    A process for the production of formaldehyde 未知

    公开(公告)号：GB941642A

    公开(公告)日：1963-11-13

    申请号：GB448862

    申请日：1962-02-06

    Applicant: BASF AG

    Inventor： GERLOFF ULRICH ,  JAHN JUERGEN ,  GOEHRE OTTO

    IPC: C07C31/04 ,  C07C45/00

    Abstract: In a process for the production of formaldehyde from methanol, crude methanol is submitted to distillation to remove a low-boiling fraction which contains the iron carbonyl contaminants, and the iron-free methanol remaining as residue is subjected to dehydrogenation in the presence of a silver metal catalyst. The distillation is preferably carried out by introducing the crude methanol into the upper part of a fractionating column having a efficiency equivalent to 2 to 20 theoretical plates, a reflux ratio between 1:10 and 1:100 being employed in the fractionation. In general, the amount of distillate, withdrawn from the top of the column, amounts to 0.2 to 0.4% by weight with reference to the crude methanol. In an example, the iron-free methanol, obtained as distillation-residue, is mixed with 45% by weight of water. The solution is evaporated the vapours are mixed with air, and the vapour-mixture is passed over silver crystals at a temperature of about 625 DEG C. whereby the methanol is converted into formaldehyde.

    Improvements in the production of cycloaliphatic alcohols and ketones by oxidation of cycloaliphatic hydrocarbons
    17.
    发明专利
    Improvements in the production of cycloaliphatic alcohols and ketones by oxidation of cycloaliphatic hydrocarbons 未知

    公开(公告)号：GB852523A

    公开(公告)日：1960-10-26

    申请号：GB3046758

    申请日：1958-09-24

    Applicant: BASF AG

    Inventor： WALDMANN HANS JOACHIM ,  PLAUTH ERNST ,  GOEHRE OTTO

    IPC: B01J19/24

    Abstract: In a process for producing cycloaliphatic alcohols and ketones by the oxidation of cycloaliphatic hydrocarbons, such as cyclohexane, methyl cyclohexane or cyclo-octane, in the liquid phase by means of oxygen-containing gas, in the presence or absence of a catalyst, the oxidation is carried out, at temperatures of 100 DEG to 180 DEG C. under a pressure of 3 to 50 atm., in a series of reactors each provided with means for circulating the oxidation-mixture therein; the mixture discharged from the last reactor is washed with water and then wholly or partly decompressed; the decompressed liquid is then passed through heat-exchangers wherein it is heated by the hot compressed mixture leaving each reactor, whereby the unreacted hydrocarbon is partially vaporized from the decompressed liquid; and the unreacted hydrocarbon is finally separated by distillation from the cycloaliphatic alcohol and ketone produced by oxidation. In the apparatus shown, there are two reactors 5 and 18. Cyclohexane is fed through pipe 1 and heat-exchangers 2 and 3, in which it is preheated to 80 DEG C., next through gas-heated preheater 4, where it is raised to 100 DEG C., and then enters reactor 5, which is provided with an insert-tube to cause circulation. Air and a solution of cobalt naphthenate in cyclohexane are pumped through pipe 6 into reactor 5. A temperature of 140 DEG C. and a pressure of 25 atm. are maintained in the reactor. Oxidation-mixture, leaving the top of the reactor, is mixed with water from pipe 11 and then flows through heat-exchanger 9, wherein it gives up heat to washed, decompressed product. The partially-cooled oxidation-mixture now flows through heat-exchanger 3, wherein it gives up further heat to the feed. The oxidation-mixture, now at 80 DEG C. is passed into separator 13 from which the water-layer is withdrawn via pipe 15. The washed oxidation-mixture is reheated to 100 DEG C. in preheater 17, and is then introduced into reactor 18, wherein oxidation takes place in the same manner as in reactor 5. The hot oxidation-mixture is mixed with water from pipe 11 and then passes through heat-exchanger 22, where it gives up heat to the washed, decompressed product which has already passed through heat exchanger 9. The partiallycooled oxidation-mixture then flows through heat-exchanger 2 into separator 25. The mixture is next mixed with fresh water, and passed to separator 30. The washing-water, withdrawn from separator 30, is supplied to line 11. The oxidation-mixture is next washed with 15% caustic soda solution, and finally with water again. The washed oxidation-mixture is withdrawn from separator 36 through pipe 38, decompressed to atmospheric-pressure by valve 39, and then passed via heat-exchangers 9 and 22 to the distillation plant where the unreacted cyclohexane is separated. Cyclohexanone and cyclohexanol are obtained by further distillation. Specification 815,162 is referred to.

    PRODUCTION OF CARBOXYLIC OR DIACARBOXYLIC ACIDS OR ANHYDRIDES
    20.
    发明专利
    PRODUCTION OF CARBOXYLIC OR DIACARBOXYLIC ACIDS OR ANHYDRIDES 未知

    公开(公告)号：CA980788A

    公开(公告)日：1975-12-30

    申请号：CA134472

    申请日：1972-02-10

    Applicant: BASF AG

    Inventor： GOEHRE OTTO ,  FRIEDRICHSEN WILHELM

    IPC: C07C51/25 ,  C07C51/265 ,  C07C51/31

    Abstract: 1369919 Acids and anhydrides by oxidation BADISCHE ANILIN- & SODA-FABRIK AG 10 Feb 1972 [11 Feb 1971] 6200/72 Heading C2C Monocarboxylic acids, dicarboxylic acids or their anhydrides are prepared by the oxidation of an aromatic hydrocarbon or an unsaturated aliphatic hydrocarbon with oxygen or an oxygen-containing gas in the presence of a supported catalyst containing V 2 O 5 , the tube in which oxidation is carried out having a wholly or partly uneven inner surface, e.g. by having projections such as metal rings or spirals, or with a metal powder fused on to the surface, or having depressions in the surface. The process is suitable for the production of phthalic anhydride from o-xylene or naphthalene or of maleic anhydride from benzene or mixtures of butadiene and n-butene.

Patent Agency Ranking