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    Decolorizing aqueous dipotassium terephthalate solutions
    12.
    发明专利
    Decolorizing aqueous dipotassium terephthalate solutions 未知

    公开(公告)号：GB1038816A

    公开(公告)日：1966-08-10

    申请号：GB2581265

    申请日：1965-06-18

    Applicant: BASF AG

    Inventor： WALZ HELMUT ,  WALLIS ALBRECHT ,  SINN RICHARD ,  NIENBURG HANS

    IPC: C07C51/47

    Abstract: Aqueous solutions of crude dipotassium terephthalate are decolorized by treatment with active carbon in 2-5 stages in apparatus wherein the crude solution is treated with carbon that has already been used in a subsequent stage and the solution is treated with fresh carbon in the final stage. The process is applied to crude dipotassium terephthalate solutions obtained by thermal rearrangement of potassium salts of other benzenecarboxylic acids in the presence of catalysts in known manner, and the catalyst and carbonaceous material formed in the rearrangement are not separated before the treatment with active carbon. Apparatus is described and comparative experimental results are given.

    Process for the continuous production of alkali metal terephthalates
    17.
    发明专利
    Process for the continuous production of alkali metal terephthalates 未知

    公开(公告)号：GB990611A

    公开(公告)日：1965-04-28

    申请号：GB3591763

    申请日：1963-09-12

    Applicant: BASF AG

    Inventor： SINN RICHARD ,  HAUSOERFER BERTHOLD ,  WALLIS ALBRECHT

    IPC: C07C51/41 ,  C07C63/28

    Abstract: Alkali metal terephthalates are produced by passing a mixture heated to 200-320 DEG C. of an alkali metal benzene carboxylate and a known catalyst through a reaction zone whose free space is practically completely filled with reaction mixture, heating the latter to 340-550 DEG C., continually moving it by means of shearing forces and discharging it, if necessary through an air lock, after a residence period of 5-60 minutes. The product may be thereafter kept in a retention vessel for 10 minutes-5 hours at 380-450 DEG C. and then discharged e.g. through an air lock.

    Continuous oxidation of aromatic compounds with nitric acid
    18.
    发明专利
    Continuous oxidation of aromatic compounds with nitric acid 未知

    公开(公告)号：GB974068A

    公开(公告)日：1964-11-04

    申请号：GB1589263

    申请日：1963-04-23

    Applicant: BASF AG

    Inventor： BORTHOLOME ERNST ,  NIENBURG HANS ,  SCHENK WALTER ,  SCHERF KARL ,  LOESCH NORBERT ,  WALLIS ALBRECHT ,  VOGEL LUDWIG

    IPC: B01J14/00 ,  B01J19/00 ,  B01J19/24 ,  C07C51/275 ,  C07C205/57 ,  C07D213/79 ,  C07D213/803 ,  C07D215/48 ,  C07D215/50

    Abstract: The parent Specification describes a process in which aromatic mononuclear compounds containing oxidizable side chains are oxidized to the corresponding carboxylic acids with nitric acid at a raised temperature and pressure, the reaction being effected in a vertical reactor through which the reagents flow upwardly and the reagents being mixed, at a temperature below the reaction temperature, before they enter the reactor, the arrangement being such that the speed of the mixture is decreased to at least one third as it enters the reactor. This process is now modified in that only 30-60% of the required nitric acid is supplied to the mixer, the remainder being supplied directly to the reactor at about the middle third. As in the parent Specification, the reaction may be effected at 150-400 DEG C. at 10-150 atm. pressure and optionally in the presence of the catalysts named in the parent Specification. Specified materials which may be oxidized are toluene, xylenes, cymene, diisopropylbenzenes, chlorotoluenes, nitrotoluenes, chloroxylenes, nitroxylenes, mesitylene, durene, toluic acids, benzyl chloride, xylylene dichlororide, chloromethylated xylenes, picolines and ethylpyridines. An example is given of the oxidation of p-xylene to terephthalic acid.

    Recovery of alkali metal salts of benzenecarboxylic acids
    19.
    发明专利
    Recovery of alkali metal salts of benzenecarboxylic acids 未知

    公开(公告)号：GB973589A

    公开(公告)日：1964-10-28

    申请号：GB2821962

    申请日：1962-07-23

    Applicant: BASF AG

    Inventor： SCHENK WALTER ,  WALLIS ALBRECHT ,  VOGEL LUDWIG

    IPC: C07C51/41 ,  C07C51/42 ,  C07C63/20

    Abstract: Dry neutral alkali metal benzenecarboxylates, which may be thermally converted into other alkali metal benzenecarboxylates, are recovered from their aqueous solutions by adjusting the latter to a pH 0.05-0.9 unit above the point of equivalence by addition of alkali metal hydroxide and dividing the solutions thus obtained into two streams, of which one is led into a conventional evaporator and the other is sprayed into a wash tower through which a CO2-containing gas passes in countercurrent. The sodium and potassium salts of benzoic, phthalic and isophthalic acids are specifically mentioned as recoverable salts. Specification 840,040 and U.S.A. Specification 2,930,813 are referred to.

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