Method for producing isocyanates

Details Method for producing isocyanates Method for producing isocyanates

2006-09-26

2006-09-26

Zucker, Paul A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C422S186220

Reexamination Certificate

active

07112694

ABSTRACT:
The present invention relates to a continuous process for preparing isocyanates by reacting primary amines with phosgene, wherein the reaction is carried out in a cascade of at least two tube reactors and the gas phase formed in the reaction is separated off in a phase separator after each reactor and only the liquid phase is passed to the next reactor or to product purification and the reaction volume of the first tube reactor is only a fraction of the total reaction volume.

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