Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1982-03-15
1983-11-15
Reamer, James H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5143
Patent
active
044157509
ABSTRACT:
In the carboxylation of 2-alkali metal naphtholates under pressure and at temperatures of above 200.degree. C., apart from the alkali metal salt of 2-naphthol-3-carboxylic acid and free 2-naphthol considerable amounts of resinous by-products are obtained which according to the hitherto known processes have to be separated and removed in a very expensive manner. According to this invention, the alkali-soluble acidic resins are separated from this carboxylation melt after its solution in water during the work-up of the carboxylation product by means of a cationic quaternary ammonium compound. These surface-active compounds precipitate the alkali-soluble acidic resins in such a manner that they can be easily removed from the alkali metal salts of 2-hydroxynaphthalene-3-carboxylic acid dissolved in water.
REFERENCES:
patent: 2723290 (1955-11-01), Klein et al.
patent: 3468942 (1969-09-01), Blum
patent: 3530174 (1970-09-01), Gottisman et al.
patent: 4020102 (1977-04-01), Seiger et al.
patent: 4057576 (1977-11-01), Backmann et al.
Gladilin et al., Chem. Abst., vol. 90, #121, 290m (1978).
Papenfahs Theodor
Volk Heinrich
Hoechst Aktiengesellschaft
Reamer James H.
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