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    16.
    发明专利
    未知

    公开(公告)号：DE1266748B

    公开(公告)日：1968-04-25

    申请号：DEB0087234

    申请日：1966-05-21

    Applicant: BASF AG

    Inventor： SCHAEFER DIPL-ING GERHARD ,  SUTER DR HUBERT ,  WIRTH DR FRIEDRICH ,  MANN DIPL-ING WALTER

    IPC: C07C51/573

    Abstract: 1,180,117. Distillation columns; purification of phthalic anhydride. BADISCHE ANILIN-& SODA-FABRIK A.G. 19 May, 1967 [21 May, 1966; 15 April, 1967], No. 23398/67. Heading BIB. [Also in Division. C2] Phthalic anhydride is purified by distillation in a plant comprising two fractionating columns 1, 5 of the tray-type connected as shown to two evaporators 2, 8 each containing a vertically-disposed bundle of tubes, the arrangement being such that the distilland flows down as a thin film on the inside of the tubes. The material to be purified is introduced about half-way up column 1, which is maintained under reduced pressure. Vapours comprising about 37% of the feed, including all the low-boiling impurities, leave the head of column 1, and are condensed; and part of the condensate is refluxed to the column. Highboiling impurities are withdrawn from the system through line 9. Purified phthalic anhydride is obtained at the head of column 5.

    19.
    发明专利
    未知

    公开(公告)号：DE1234211B

    公开(公告)日：1967-02-16

    申请号：DEB0073159

    申请日：1963-08-17

    Applicant: BASF AG

    Inventor： SUTER DR HUBERT

    IPC: C08G59/42 ,  C08G63/553

    Abstract: In a process for the production of bicylic carboxylic acid derivatives trans - cyclohexadiene -(3,5) - dicarboxylic acid - (1,2) is reacted at elevated temperature with a dienophilic compound in the presence of an anhydride of an aliphatic carboxylic acid containing two to six carbon atoms. In examples: the dimer of cyclohexadiene-(3,5)-trans-dicarboxylic acid (1,2)-anhydride is obtained by heating the monomer with acetic anhydride or propionic anhydride (1); bicyclo-(2,2,2)-7-octene-2,3,5-tricarboxylic acid anhydride is obtained by heating cyclohexadiene-(3,5)-GAMMA-trans - dicarboxylic acid - (1,2), acrylic acid and acetic anhydride (2); bicyclo - (2,2,2) - 7 - octene - 5 - carbobutoxy - 2,3 - dicarboxylic anydride is obtained in a similar process using butyl acrylate instead of acrylic acid and other acrylic esters including the methanol, ethanol 2-ethyl-hexanol and lauryl alcohol esters are specified (3); bicylo-(2,2,2)- 7 - octene-5-cyano2,3-dicarboxylic acid is obtained similarly using acrylonitrile instead of acrylic acid (4); and bicyclo - (2,2,2) - 7 - octene - 2,3,5,6-tetracarboxylic acid anhydride is obtained similarly using maleic anhydride instead of acrylic acid.

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