阅读说明：本技术 异氰酸苯酯转化方法 (Phenyl isocyanate conversion process ) 是由 R·E·赫夫纳 H·布劳恩 B·克拉姆 A·科斯塔 于 2020-01-23 设计创作，主要内容包括：通过在碳二亚胺化催化剂存在下反应以形成对应的N,N’-二苯基碳二亚胺而从获自MDI和/或PMDI制造方法的溶剂流中去除异氰酸苯酯。所述N,N’-二苯基碳二亚胺可以再循环到所述MDI和/或PMDI制造方法中,其中它们可以与MDI和/或PMDI反应以形成脲酮亚胺。所述脲酮亚胺对所述MDI和/或PMDI产物的特性和有用性的影响至多最小,并且因此可以留在所述MDI和/或PMDI产物中。(Phenyl isocyanate is removed from a solvent stream obtained from an MDI and/or PMDI manufacturing process by reaction in the presence of a carbodiimidization catalyst to form the corresponding N, N' -diphenylcarbodiimide. The N, N' -diphenylcarbodiimides may be recycled to the MDI and/or PMDI manufacturing process where they may be reacted with MDI and/or PMDI to form uretonimines. The uretonimine has at most minimal effect on the properties and usefulness of the MDI and/or PMDI product and therefore may remain in the MDI and/or PMDI product.)