专利名称：Improved process for the preparation of
(poly-)isocyanates in the gas phase
发明人：FRIEDRICH, MARTIN, DR.,STUTZ, HERBERT,
DR.
申请号：EP02026860.3申请日：20021202公开号：EP1319655A2公开日：20030618
摘要：Preparation of di- and/or triisocyanates by phosgenation of corresponding di-and/or triamines involves heating the gaseous di- and/or triamines and phosgeneseparately to 200-600 degrees C, mixing the two in a static mixer with specific geometryand supplying the mixture continuously to a reaction zone without moving parts.Preparation of di- and/or triisocyanates of formula (I) by phosgenation of correspondingdi- and/or triamines of formula (II) involves heating gaseous (II) (optionally diluted withinert gas or solvent vapor) and phosgene (III) separately to 200-600 degrees C, mixingthe two gaseous starting materials in a static mixer with specific geometry and supplyingthe mixture continuously to a reaction zone without moving parts. (II) and (III) flow inparallel through a reactor, (II) being supplied through a central nozzle into a slower flowof (III) supplied via the annular space around the nozzle. The ratio of the narrowestnozzle diameter (d) to the reactor diameter (D) is 5-45%. R(NCO)n (I) R(NH2)n (II) R =aliphatic, cycloaliphatic or aromatic hydrocarbyl with up to 15C, provided that at least 2Care present between two NCO groups; and n = 2 or 3 (preferably 2).
申请人：BAYER MATERIALSCIENCE AG
地址：51368 Leverkusen DE
国籍：DE
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