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    • 3. 发明授权
    • Purification of acid halides
    • 酰卤的纯化
    • US4693851A
    • 1987-09-15
    • US834703
    • 1986-02-28
    • Mark A. BannickGeorge A. Divers, IIIViktors Jansons
    • Mark A. BannickGeorge A. Divers, IIIViktors Jansons
    • C07C51/64
    • C07C51/64
    • A method of purifying an aromatic carboxylic acid halide, for example p-phenoxybenzoyl chloride, comprising the steps of: (a) adding an acidic catalyst, for example a molecular sieve, to the acid halide; (b) heating the resulting mixture of the acidic catalyst and the acid halide to a temperature of about 180.degree. C. to about 250.degree. C. for a period of at least 0.5 hours; (c) distilling the mixture to obtain acid halide substantially free of aldehyde and the halo derivative thereof. Optionally, a reactive aromatic compound may be added to the mixture of the acid halide and the acidic catalyst before the heating step. The process is particularly useful for providing aromatic acid halides of sufficient purity for preparing melt stable aromatic polyketones.
    • 一种纯化芳族羧酸卤化物的方法,例如对苯氧基苯甲酰氯,包括以下步骤:(a)向酸式卤化物中加入酸性催化剂,例如分子筛; (b)将所得酸性催化剂和酰卤的混合物加热至约180℃至约250℃的温度至少0.5小时; (c)蒸馏混合物以获得基本上不含醛的酰卤及其卤代衍生物。 任选地,可以在加热步骤之前将反应性芳族化合物加入到酰卤和酸性催化剂的混合物中。 该方法特别可用于提供足够纯度的用于制备熔融稳定的芳族聚酮的芳族酰卤。