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发明公开
CN106916070A 制备二苯基甲烷系列的二胺和多胺的方法 无效 - 驳回

制备二苯基甲烷系列的二胺和多胺的方法
摘要：
本发明涉及制备二苯基甲烷系列的二胺和多胺的方法，和涉及从这些二胺和多胺制备二苯基甲烷系列的二异氰酸酯和多异氰酸酯的方法。二苯基甲烷系列的二胺和多胺是通过苯胺和甲醛在盐酸存在下的反应制得。在本发明中所使用的甲醛是作为含有低于0.001 wt%的二价和/或大于二价的金属离子的水溶液来使用的。
摘要（英）：

The present invention relates to a process for the preparation of di-and polyamines of the diphenylmethane series, and to the preparation of di-and polyisocyanates of the diphenylmethane series from these di-and polyamines. The di-and polyamines of the diphenylmethane series are prepared by the reaction of aniline and formaldehyde in the presence of hydrochloric acid. In the present invention, the formaldehyde employed is used as an aqueous solution which contains less than 0.001 wt% of metal ions which are divalent and/or more than divalent.

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