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    • 5. 发明公开
    • Process For Converting A Hydroxy Carboxylic Acid Or Salts Thereof, To An Unsaturated Carboxylic Acid And/Or Its Esters
    • 一种用于在不饱和羧酸和/或其酯转化羟基羧酸或其盐处理
    • EP2036879A1
    • 2009-03-18
    • EP08164021.1
    • 2008-09-10
    • Rohm and Haas Company
    • Bogan, JR, Leonard EdwardSilvano, Mark AnthonyZolotorofe, Donald Lee
    • C07C51/02C07C59/01C07C59/10C07C59/08C07C57/065C07C67/08C07C69/54
    • C07C51/02C07C51/377C07C59/08C07C59/01C07C59/10C07C57/04
    • A process for converting a salt of a hydroxycarboxylic acid to an unsaturated carboxylic acid, or esters thereof. The process involves converting an ammonium salt of a hydroxycarboxylic acid in aqueous solution to a corresponding hydroxycarboxylic acid and ammonium cation in aqueous solution; and separating the ammonium cation from the aqueous solution, leaving the hydroxycarboxylic acid in aqueous solution. The converting and separating steps may be accomplished by employing a hydrophobic acid or an acid ion exchange resin, each of which must have an acid dissociation constant, i.e., pK a , at least 0.5 less that that of the salt of the hydroxycarboxylic acid. Where a hydrophobic acid is used, it must be immiscible in water, and its salt must also be immiscible in water, and the resulting multi-phase solution comprises an aqueous phase comprising the corresponding hydroxycarboxylic acid, as well as a non-aqueous phase comprising a neutralized acid. Alternatively, where the ion exchange resin is used, the aqueous solution of the ammonium salt of a hydroxycarboxylic acid is contacted with the resin, thereby converting the salt to a hydroxycarboxylic acid and capturing the ammonium cations on the resin. In either case, the aqueous solution is treated, such as by heating, to separate and recover the hydroxycarboxylic acid. The non-aqueous phase or resin is treated to separate and recover ammonia useful for preparing additional ammonium salt of a hydroxycarboxylic acid.
    • 一种用于在不饱和羧酸的羟基羧酸的盐转化为或其酯的方法。 该过程涉及转换成在wässrige溶液的羟基羧酸的铵盐在wässrige溶液中的相应的羟基羧酸和铵阳离子; 和分离从wässrige溶液中的铵阳离子,留下wässrige溶液中的羟基羧酸。 转换和分离步骤可通过采用疏水性酸或酸离子交换树脂来实现,其每一个必须具有酸离解常数,即,pK a的,小至少0.5 thatthat的羟基羧酸的盐。 当使用疏水性酸,它必须是在水不混溶的,因此,其盐必须在与水不混溶,并且wässrige相包含相应的羟基羧酸的所得多相溶液包含,以及非水相包含 中和的酸。 可替代地,使用离子交换树脂,其中,羟基羧酸的铵盐的wässrige溶液与树脂接触,从而将盐转化为羟基羧酸和捕获在树脂上的铵阳离子。 在任一种情况下,溶液是wässrige治疗,:例如通过加热,以分离​​和回收羟基羧酸。 非水相或树脂经处理以分离和回收氨用于制备羟基羧酸的附加铵盐是有用的。