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    • 5. 发明授权
    • Process for the preparation of aromatic hydroxycarboxylic acids
    • 制备芳族羟基羧酸的方法
    • US4508920A
    • 1985-04-02
    • US472501
    • 1983-03-07
    • Gerhard StoppHorst KarkossaViktor Trescher
    • Gerhard StoppHorst KarkossaViktor Trescher
    • C07C65/03B01J31/00C07C51/15
    • C07C51/15
    • Aromatic hydroxycarboxylic acids are prepared by reacting alkali metal salts of aromatic hydroxy compounds in the solid phase with carbon dioxide in a process in which the alkali metal salt of the aromatic hydroxy compound is reacted at temperatures of 120.degree. to 300.degree. C., in the form of granules, in a fluidized bed with carbon dioxide, if appropriate under elevated pressure and, if appropriate, in the presence of the aromatic hydroxy compound in the form of vapor, with continuous removal, by means of excess carbon dioxide, of the aromatic hydroxy compound which is formed, until at least 40% of the hydroxy compound have been converted into the alkali metal salt of the corresponding hydroxycarboxylic acid, and, if appropriate, the resulting alkali metal salt of the hydroxycarboxylic acid is reacted further in a subsequent stage at temperatures of 150.degree. to 300.degree. C. and under elevated pressure, in the presence of carbon dioxide, with the aromatic hydroxy compound formed, and the resulting reaction product is then converted in a customary manner into the free acid.
    • 芳族羟基羧酸通过在固相中的芳族羟基化合物的碱金属盐与二氧化碳反应制备,其中芳族羟基化合物的碱金属盐在120℃至300℃的温度下反应, 如果合适,在升高的压力下,并且如果合适的话,在蒸气形式的芳香族羟基化合物存在下,用二氧化碳的流化床,通过过量二氧化碳连续除去芳族化合物 形成的羟基化合物,直到至少40%的羟基化合物已经转化为相应的羟基羧酸的碱金属盐,并且如果合适,所得羟基羧酸的碱金属盐在后续阶段进一步反应 在150-300℃的温度和升高的压力下,在二氧化碳的存在下,形成芳香族羟基化合物,并且将res 然后将过量的反应产物以常规方式转化成游离酸。