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Process for improving yields in a disproportionation reaction (high yield Henkel)

机译:在歧化反应中提高收率的方法(高收率汉高)

摘要

Disclosed is a process for disproportionation of potassium naphthoate to the dipotassium salt of 2,6-NDA which gives reproducible improved yields of up to 40% which comprises:;a) reacting naphthoic acid in the presence of excess base to produce a disproportionation feed comprising a finely dispersed disordered salt mixture of excess base salts and naphthoic acid salts, wherein the feed is prepared by the steps of:;(1) Reacting naphthoic acid in the presence of excess base selected from the group consisting of carbonates and bicarbonates to form a sa;(2) Drying said salt mixture by a method which forms a highly mixed disordered salt mixture characterized by a differential scanning calorimeter(DSC) signature characterized by low melting peaks not previously observed in the sa and;b) Disproportionating said solid salts in the presence of a disproportionation catalyst to form the dipotassium salts of 2,6-NDA.
机译:公开了一种使萘甲酸钾歧化为2,6-NDA的二钾盐的方法,其产生高达40%的可再现的提高的产率,其包括:a)在过量碱的存在下使萘甲酸反应以产生歧化进料,其包括过量碱盐和萘甲酸盐的细分散无序盐混合物,其中进料通过以下步骤制备:(1)使萘甲酸在选自碳酸盐和碳酸氢盐的过量碱的存在下反应以形成(2)通过形成高度混合的无序盐混合物的方法来干燥所述盐混合物,所述无序盐混合物的特征在于差示扫描量热仪(DSC)特征在于在盐中先前未观察到的低熔融峰。 b)在歧化催化剂存在下使所述固体盐歧化,形成2,6-NDA的双钾盐。

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