申请人:THE DOW CHEMICAL COMPANY
公开号:EP0228643A2
公开(公告)日:1987-07-15
Ferric chloride is removed from mixtures with chlorinated and/or fluorinated pyridines and methylpyridines by extraction with diol solvents. For example, the ferric chloride in halopyridine mixtures containing 2,3,5,6-tetrachloropyridine was removed by extraction with ethylene glycol. The purified halopyridines are useful intermediates for the production of insecticides, herbicides, and fungicides.
用二元醇溶剂萃取可从含氯和/或含氟吡啶和甲基吡啶的混合物中去除氯化铁。 例如,用乙二醇萃取可去除含 2,3,5,6-四氯吡啶的卤代吡啶混合物中的氯化铁。 纯化的卤代吡啶是生产杀虫剂、除草剂和杀真菌剂的有用中间体。