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    • 18. 发明公开
    • PRODUCTION OF D,L-ASPARTIC ACID
    • HERSTELLUNG VON D,L-ASPARAGINSÄURE
    • EP0934248A4
    • 2000-02-02
    • EP97927843
    • 1997-05-30
    • DONLAR CORP
    • MAZO GRIGORY YAMAZO JACOBVALLINO BARNEY JRROSS ROBERT J
    • C07C227/08C07C229/24C07C205/00C07C207/00C07C229/00
    • C07C227/08C07C229/24
    • The present invention is directed to a method for the production of D,L-aspartic acid. The method comprises reacting an unsatured dicarboxylic acid or anhydride such as maleic acid, fumaric acid, maleic anhydride or mixtures thereof with excess aqueous ammonia at an elevated temperature and pressure for a time sufficient to produce diammonium D,L aspartate. The diammonium D,L aspartate is then neutralized to D,L-aspartic acid; excess unreacted ammonia and various by-products may be recycled and re-used in the method, thereby minimizing waste and cost; i.e. the process is useful for a continuous production process which may be represented conveniently as a schematic block diagram wherein a pressurized reactor (10) receives a reactant admixture from feed tank (12), the reactants being fed subsequently to flash vessel (14) and then precipitator (16) where D,L-aspartic acid is produced upon neutralization, with dicarboxylic acid salts being recovered in a centrifuge (18) and dried in a drier (20). The D,L-aspartic acid may subsequently be used to make polyaspartic acid.
    • 本发明涉及生产D,L-天冬氨酸的方法。 该方法包括使不饱和二羧酸或酸酐如马来酸,富马酸,马来酸酐或其混合物与过量的氨水在升高的温度和压力下反应足够的时间以产生二铵D,L-天冬氨酸盐。 然后将二铵D,L-天冬氨酸中和成D,L-天冬氨酸; 过量的未反应的氨和各种副产品可以在该方法中再循环和再利用,从而最大限度地减少浪费和成本; 即该过程对于连续生产过程是有用的,其可以简单地表示为其中加压反应器(10)接收来自进料罐(12)的反应物混合物的示意性框图,反应物随后被供给至闪蒸器(14),并且 然后在中和后产生D,L-天冬氨酸的沉淀器(16)与二羧酸盐在离心机(18)中回收并在干燥器(20)中干燥。 D,L-天冬氨酸可随后用于制造聚天冬氨酸。