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    • 33. 发明授权
    • Long-chain ketene dimers
    • 长链烯酮二聚体
    • US5344943A
    • 1994-09-06
    • US998810
    • 1992-12-29
    • Nils Brolund
    • Nils Brolund
    • C07D305/12C07C45/89C07C49/88D21H17/05D21H17/17
    • C07C45/89C07C49/88D21H17/17
    • Long-chain ketene dimers are prepared in a process in which in the absence of an organic solvent, carboxylic acid chloride is fed, with intensive mixing, into a recipient of triethyl amine at a rate of not more than 3 moles/hour per mole of present triethyl amine, and the mixing rate, feed rate, and heat exchange are so attuned to each other that the viscosity of the mixture always is less than 250 mPa.s, measured at 60.degree. C. (rate of shear higher than 100 l/sec). The process is characterized in that the molar ratio of the total amount of carboxylic acid chloride fed in to the recipient amount of amine is 1:1.025 to 1:2, and, after the conversion, the reaction mixture containing the ketene dimer is treated with diluted aqueous hydrochloric acid or an aqueous solution of triethyl amine hydrochloride and hydrochloric acid, and the ketene dimer is separated. The ketenes prepared in accordance with the present invention are highly suitable for use in paper sizing.
    • 在不存在有机溶剂的情况下,将长链烯酮二聚体以不超过3摩尔/小时/摩尔的速率加入到三乙胺的接受者中的方法制备, 存在三乙胺,并且混合速率,进料速率和热交换彼此相适应,混合物的粘度总是小于250mPa.s,在60℃下测量(剪切速率高于100μl /秒)。 该方法的特征在于进料的羧酸氯化物的总量与胺的接收量的摩尔比为1:1.025至1:2,转化后,含有乙烯酮二聚体的反应混合物用 稀盐酸水溶液或盐酸三乙胺水溶液,分离出烯酮二聚体。 根据本发明制备的烯酮非常适合用于纸张施胶。