There is disclosed herein improved processes for the preparation of mixtures of alkali metal salts of 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylate and alkali metal salts of 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylate wherein by-product calcium carbonate produced by the process of making such mixtures is employed in a recycle pattern to prepare additional amounts of mixtures of said compounds.
本文公开了制备 1-羟基-3-氧杂-1,2,4,5-
戊烷四
羧酸碱
金属盐混合物和 3,6-二氧杂-1,2,4,5,7,8-
辛烷六
羧酸碱
金属盐混合物的改进工艺,其中制备此类混合物的工艺所产生的副产品
碳酸钙以循环模式用于制备更多数量的上述化合物混合物。