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二甲苯胺(1)用于磺胺药(磺胺一甲氧嘧啶、磺胺二甲氧嘧啶等)的生产,在用氯氧磷氯化4-氨基-2,6-二羟基嘧啶时作催化剂。工业回收方法是用过量40％的苛性钠处理4-氨基-2,6-二氯嘧啶母液,由于含大量杂质(主要物质不超过94％),重新使用必须真空蒸馏。除分离时损耗1外,在真空蒸馏时由于和有机层中所含无机的与有机杂质作用,相当一部分树脂化。回收率不超过44%。此外,在长时间的真空蒸馏过程中,回收
Dimethylaniline (1) is used in the sulfonamides (sulfamethazine, sulfamethazine, etc.) for the production of 4-amino-2,6-dihydroxypyrimidine when chlorinated with phosphorus oxychloride. The industrial recovery method is to treat the 4-amino-2,6-dichloropyrimidine mother liquor with 40% excess of caustic soda. Due to the large amount of impurities (not more than 94% of the main material), the re-use must be vacuum distilled. In addition to the separation loss 1, due to vacuum organic and organic layer contained in the organic impurities, a considerable part of the resinification. The recovery rate does not exceed 44%. In addition, during long vacuum distillation, recovery