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    Production of dialkyl esters of naphthalene-2,6-dicarboxylic acid
    1.
    发明专利
    Production of dialkyl esters of naphthalene-2,6-dicarboxylic acid 未知

    公开(公告)号：GB1118425A

    公开(公告)日：1968-07-03

    申请号：GB2231066

    申请日：1966-05-19

    Applicant: BASF AG

    Inventor： WALLIS ALBRECHT ,  NIENBURG HANS ,  WALZ HELMUT ,  LUDWIG WINFRIED

    IPC: C07C63/38 ,  C07C69/76

    Abstract: The invention relates to the production of dialkyl esters of naphthalene-2,6-dicarboxylic acid in which an acid alkali metal, e.g. potassium salt of naphthalene-2,6-dicarboxylic acid is heated with a primary alkanol, e.g. containing 1 to 4 carbon atoms to a temperature of from 200 DEG to 350 DEG C. and the reaction mixture is separated into the neutral ester of naphthalene-2,6-dicarboxylic acid and the neutral alkali salt of naphthalene-2,6-dicarboxylic acid.

    Production of alkali metal terephthalates
    5.
    发明专利
    Production of alkali metal terephthalates 未知

    公开(公告)号：GB973591A

    公开(公告)日：1964-10-28

    申请号：GB3013962

    申请日：1962-08-07

    Applicant: BASF AG

    Inventor： SCHENK WALTER ,  WALLIS ALBRECHT

    IPC: C07C51/41

    Abstract: In a process for the production of terephthalic acid salts by catalytic thermal treatment of potassium salts (or a mixture of sodium salts and 30-100% potassium salts) of other benzenecarboxylic acids, the aqueous solution of conversion mixture obtained is brought to a pH value between 7 and 9 by leading in carbon dioxide; the solution is filtered and the residue is added as catalyst to a starting material for the thermal conversion. The residue may be dried and suspended as a finely-divided powder in a solution of the starting benzenecarboxylic acid salt prior to atomization of the latter to give dry starting mixture for the conversion. In examples, cadmium and zinc catalysts are thus recirculated; iron catalysts are also mentioned. Specification 816,248 is referred to.

    Separation of aromatic or pyridine dicarboxylic acids
    7.
    发明专利
    Separation of aromatic or pyridine dicarboxylic acids 未知

    公开(公告)号：GB979280A

    公开(公告)日：1965-01-01

    申请号：GB2822062

    申请日：1962-07-23

    Applicant: BASF AG

    Inventor： SCHENK WALTER ,  VOGEL LUDWIG ,  WALLIS ALBRECHT

    IPC: C07C51/41 ,  C07C51/42 ,  C07C51/43 ,  C07D213/78

    Abstract: Aromatic or pyridine dicarboxylic acids which have two carboxylic groups in the least hindered position and have been obtained by the thermal rearrangement or disproportionation of other carboxylic acids and/or salts, are separated by dissolving the reaction mixture in water or a mixture thereof with low molecular weight water-soluble alcohols or ethers, heating the solution to 80-250 DEG C., acidifying by adding an aromatic monocarboxylic acid or an acid thallium or alkali metal salt (of higher acidity than the corresponding salt of the dicarboxylic acid to be separated) of an aromatic or pyridine dicarboxylic acid, an aromatic polycarboxylic acid, a pyridine carboxylic acid or mixtures thereof to pH 4.1-6.5, the acid salt of the dicarboxylic acid to be separated being completely formed, cooling to 20-30 DEG C., separating the solids and mixing with water to form a slurry which is heated at 105-250 DEG C. at up to 5 atmospheres; acidifying to pH 2.1-4.5 and so that the desired dicarboxylic acid is formed using an aromatic monocarboxylic acid, an aromatic or pyridine di- or poly-carboxylic acid or mixtures thereof or an anhydride of said dicarboxylic acid; cooling to 100-115 DEG C. and separating the crystallized solids. Examples describe the separation of terephthalic acid and pyridine-2, 5-dicarboxylic acid. Naphthalene-2,6-dicarboxylic acid and 4,41-diphenyl dicarboxylic acid are also mentioned. Specification 816,691 is referred to.

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