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    • 29. 发明授权
    • Process for purifying terephthalic acid
    • 对苯二甲酸纯化方法
    • US4263452A
    • 1981-04-21
    • US147283
    • 1980-05-06
    • Makoto KomatsuRyoichi Oda
    • Makoto KomatsuRyoichi Oda
    • C07C51/487C07C51/42
    • C07C51/487
    • Crude terephthalic acid obtained by oxidation of p-tolualdehyde in a liquid phase with molecular oxygen in the presence of a bromine compound as a catalyst, using water as a solvent is purified by dissolving the crude terephthalic acid in water, hydrogenating the aqueous solution of terephthalic acid with molecular hydrogen in the presence of a hydrogenating catalyst, and recrystallizing the terephthalic acid from the hydrogenated aqueous solution, where an alkaline material such as a hydroxide, a carbonate, or a bicarbonate of sodium, potassium, calcium or barium is added to the aqueous solution of terephthalic acid to be purified before the hydrogenation.The purified terephthalic acid has a very low 4-CBA content, and no hydrogenation catalyst activity is lowered by the addition of the alkaline material.
    • 通过在溴化合物作为催化剂的存在下,用分子氧在液相中通过使用水作为溶剂氧化对甲苯甲醛得到的粗对苯二甲酸通过将粗对苯二甲酸溶解在水中来氢化对苯二甲酸的水溶液 在氢化催化剂存在下与分子氢反应,并从氢化水溶液中重结晶对苯二甲酸,其中将碱性物质如氢氧化物,碳酸盐或碳酸氢钠,钠,钾,钙或钡加入到 在氢化之前要纯化的对苯二甲酸水溶液。 纯化的对苯二甲酸具有非常低的4-CBA含量,并且通过加入碱性材料不会降低氢化催化剂活性。