| 摘要 |
PROBLEM TO BE SOLVED: To produce an aromatic diisocyanate by reacting a corresponding primary aromatic diamine with phosgene in a vapor phase. SOLUTION: Phosgene is reacted with the primary aromatic diamine within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains <0.05 mol% overall of aliphatic amine containing no keto groups per mole of primary amino groups. COPYRIGHT: (C)2009,JPO&INPIT
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