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    Production of cyanuric acid
    1.
    发明专利
    Production of cyanuric acid 未知

    公开(公告)号：GB1042174A

    公开(公告)日：1966-09-14

    申请号：GB2631363

    申请日：1963-07-03

    Applicant: BASF AG

    Inventor： CLAREN OTTO BERND ,  UNTERSTENHOEFER LEO

    IPC: C07D20060101

    Abstract: In the production of cyanuric acid by thermal decomposition of urea, a layer of urea between 0.5 mm. and 5.0 mm. is heated to between 250 DEG and 380 DEG C. and kept at this temperature for 5 to 30 minutes. The urea, in solid or liquid form, may be deposited as a layer on an endless conveyer belt and heated thereon. In an example, molten urea was passed down a shoot heated to a temperature above the melting-point of urea on to a metal conveyer belt heated to 300 DEG C. to form a layer 2 mm. thick. After eleven minutes, flakes of cyanuric acid were collected.

    Production of plasticiser esters
    2.
    发明专利
    Production of plasticiser esters 未知

    公开(公告)号：GB1112868A

    公开(公告)日：1968-05-08

    申请号：GB3970265

    申请日：1965-09-17

    Applicant: BASF AG

    Inventor： CLAREN OTTO BERND ,  BRUNNMUELLER FRIEDRICH ,  SUTER HUBERT

    IPC: C07C67/00 ,  C07C67/08 ,  C07C69/34 ,  C07C69/54 ,  C07C69/60 ,  C07C69/80

    Abstract: In a process for making esters from phthalic acid or anhydride, or an (at least C4) aliphatic saturated or olefinically unsaturated dicarboxylic acid, and an (at least C7) aliphatic alcohol, the product is neutralized with (a) 0.5-10 wt. per cent aq. NaOH or KOH solution to an extent of 80-98%, (b) 1-20% aq. alkali metal carbonate or bicarbonate solution to completion, the residence time in each stage being less than 3 minutes. In examples, phthalic anhydride is reacted with ethylhexanol or isononanol.

    Continuous production of o-phthalic esters
    4.
    发明专利
    Continuous production of o-phthalic esters 未知

    公开(公告)号：GB1086132A

    公开(公告)日：1967-10-04

    申请号：GB286765

    申请日：1965-01-22

    Applicant: BASF AG

    Inventor： SUTER HUBERT ,  POEHLER GUENTHER ,  BRUNMUELLER FRIEDRICH ,  CLAREN OTTO BERND

    IPC: C07C67/08 ,  C07C69/34 ,  C07C69/80

    Abstract: Diesters of phthalic acid are prepared by a continuous process in which liquid phthalic anhydride is first mixed with alcohol in the molar ratio 1:0.8 to 1:1.2, the alcohol having a b.p. 180-250 DEG C. and having been preheated to 3-30 DEG C. below its b.p., the (mainly) monoester so formed is then mixed with excess alcohol, and the mixture heated until formation of the diester is practically complete. In examples, the alcohols used are 2-ethylhexanol, mixed iso-octanols (b.p. 184-189 DEG C.), isononanol and isodecanol (b.p. 212-215 DEG C.).

    A process for the production of cyanuric acid
    6.
    发明专利
    A process for the production of cyanuric acid 未知

    公开(公告)号：GB906231A

    公开(公告)日：1962-09-19

    申请号：GB959661

    申请日：1961-03-16

    Applicant: BASF AG

    Inventor： CLAREN OTTO BERND

    IPC: C07D20060101

    Abstract: Cyanuric acid is prepared by heating urea in the presence of a solvent consisting of a mono- or di-hydric alcohol which contains no ether groups and has a boiling point above 170 DEG C., preferably between 200 DEG C. and 300 DEG C. Suitable alcohols are 1,4-butane-diol, 1,6-hexane-diol, n-octyl alcohol, and n-nonyl alcohol. The cyanuric acid produced as a fine powder may be separated by, for example, suction filtration or centrifugation. In the Example 300 parts of n-octyl alcohol are heated with 200 parts of urea. A homogeneous solution forms at 130 DEG C. and evolution of ammonia begins at 170 DEG C. The boiling point of n-octyl alcohol (usually 194 DEG C.) rises under the reaction conditions to about 235 DEG C. The precipitated acid is suction filtered and washed with a little methanol, and the whole process is then repeated six times, 200 parts of urea being added each time to the same alcohol. The yield of cyanuric acid is 95% of the theoretical yield. The Specification also contains a review of prior art processes in which cyanuric acid is prepared by heating urea in the presence of phenols, ether alcohols, acid amides, sulphuric acid, diphenyl, and fused tin.

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