公开(公告)号：US06469212B1

公开(公告)日：2002-10-22

申请号：US09531210

申请日：2000-03-20

申请人： John C. Prindle, Jr. ,  Michael W. Easson ,  James Dee Palmer ,  Jason G. Jones ,  Max K. Mortensen ,  James E. Boone

发明人： John C. Prindle, Jr. ,  Michael W. Easson ,  James Dee Palmer ,  Jason G. Jones ,  Max K. Mortensen ,  James E. Boone

IPC分类号： C07C20900

CPC分类号： C07C209/86 ,  C07C211/50

摘要： A mixture comprised of about 60-85% of 2,4-toluenediamine (2,4-TDA) and about 15-40% of 2,6-toluenediamine (2,6-TDA) is melted, the temperature of the mixture is lowered to a 2,4-TDA nucleation temperature, and the temperature of the mixture is gradually reduced from the nucleation temperature to about 65 to about 70° C. The resultant mixture is in the form of a solids phase enriched in 2,4-TDA, and a novel and useful liquid phase enriched in 2,6-TDA. These phases are separated. Preferably the solids are further purified by “sweating” them and removing the sweated liquid impurities. The sweated liquid can be recycled together with another charge of a mixture comprised of 2,4-TDA and 2,6-TDA. 2,4-TDA can be produced with a purity of 96-99%.

摘要翻译： 将由约60-85％的2,4-甲苯二胺（2,4-TDA）和约15-40％的2,6-甲苯二胺（2,6-TDA）组成的混合物熔化，混合物的温度为 降低至2,4-TDA成核温度，并且混合物的温度从成核温度逐渐降低至约65至约70℃。所得混合物为富含2,4-二甲酸的固体相的形式， TDA，以及富含2,6-TDA的新型有用的液相。 这些阶段是分开的。 优选地，通过将​​它们“出汗”并除去出汗的液体杂质来进一步纯化固体。 可以将出汗的液体与另一种由2,4-TDA和2,6-TDA组成的混合物一起再循环。 可以生产纯度为96-99％的2,4-TDA。