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    Production of pure-n-dimethylacylamides
    1.
    发明授权
    Production of pure-n-dimethylacylamides 失效
    纯N-二甲基酰胺的生产

    公开(公告)号：US3627830A

    公开(公告)日：1971-12-14

    申请号：US3627830D

    申请日：1969-02-03

    Applicant: BASF AG

    Inventor： KERBER HORST ,  HOHENSCHUTZ HEINZ ,  RAUCH KONRAD

    IPC: C08K5/20 ,  C07C103/00

    CPC classification number: C08K5/20

    Abstract: Production of pure N-dimethylacylamides having from two to four carbon atoms in the acyl radical by reaction of an excess of dimethylamine with an aliphatic carboxylic acid having two to four carbon atoms at elevated temperature and distillation of the N-dimethylacylamide formed, the distillation being carried out continuously in a column. Dimethylamine and the carboxylic acid in the molar ratio from 1.1:1 to 5:1 are introduced at from 80* to 220* C. and from 0.1 to 2 atmospheres in the absence of any catalyst into a mixture of N-dimethylacylamide and its carboxylic acid, the carboxylic acid content of the mixture corresponding at least to the amount of carboxylic acid present in the azeotropic mixture of the N-dimethylacylamide and its carboxylic acid. Ndimethylacylamides are used as solvents for polymers.

    Production of Elastomers Containing Urethane Groups.
    7.
    发明专利
    Production of Elastomers Containing Urethane Groups. 未知

    公开(公告)号：GB1158270A

    公开(公告)日：1969-07-16

    申请号：GB5407866

    申请日：1966-12-02

    Applicant: BASF AG

    Inventor： KUNDE JOACHIM ,  WILHELM HANS ,  DOERFEL HELMUT ,  RAUCH KONRAD

    IPC: C08G18/10 ,  C08G18/42

    Abstract: 1,158,270. Polyesterurethanes. BADISCHE ANILIN- & SODA-FABRIK A.G. 2 Dec., 1966 [4 Dec., 1965], No. 54078/66. Heading C3R. Polyesterurethanes are prepared by reacting an hydroxyl group containing polyester of M.W. 500 to 5,000 which has been prepared by reacting adipic acid with a mixture of 45 to 90% by weight of 1,6-hexanediol and 10 to 55% by weight of 2,2,4-trimethylpentanediol -1,3, first with a stoichiometric excess of an organic polyisocyanate followed by reaction with a chain extender which is preferably a diamine, hydrazine, a hydrazide or a glycol. If desired the reactions are carried out in the presence of an inert polar solvent such as dimethylformamide, dimethylacetamide, tetramethylurea or dimethyl sulphoxide. Up to 50% by weight of 2,2,4-trimethylpentanediol-1,3 may be replaced by 2,2-dimethylhexanediol-1,3. Suitable polyisocyanates are 4,4 1 -diphenylmethane diisocyanate; 2,4-toluylene diisocyanate; p-phenylene diisocyanate; 1,5-naphthylene diisocyanate; 1,6-hexane diisocyanate and 4,4 1 -diphenyl (thio) ether diisocyanates. The chain extenders may be ethylene diamine; propylene diamine; n-xylylene diamine; hydrazine; carbodihydrazide; adipodihydrazide; ethylene glycol and 1,4-butane diol. The resulting polymers may be used in the production of fibres or films. The preparation of polyesters from adipic acid and a diol mixture of 45 to 90% by weight of hexanediol-1,6 and 10 to 55% by weight of 2,2,4-trimethylpentanediol- 1,3 is described in the examples. In Example 1, the ratio of hexanediol-1,6 to 2,2,4-trimethylpentanediol-1,3 is 76À4: 23À6 and in Example 2 86À6: 13À4.

    9.
    发明专利
    未知

    公开(公告)号：FI750372A

    公开(公告)日：1975-08-16

    申请号：FI750372

    申请日：1975-02-12

    Applicant: BASF AG

    Inventor： RAUCH KONRAD ,  KIEFER HANS ,  HESSE DIETER ,  STROHMEYER MAX ,  HOHENSCHUTZ HEINZ

    IPC: C07C53/02 ,  C07C51/00 ,  C07C51/44 ,  C07C67/00 ,  C07C

    Abstract: Formic acid is isolated from mixtures containing formic acid, methyl formate, methanol and water by fractional distillation, the mixture being fed into the upper half of the distillation column and 5 to 15 theoretical plates being maintained above the feed point and 10 to 25 theoretical plates below the feed point. The formic acid is withdrawn at the bottom end of the column as an azeotrope with water, the azeotrope being in the liquid state or preferably in the vapor state.

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