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US 7,064,233 B2Granted
Method for producing isocyanates
AssigneeBASF SE
InventorsThorsten Rohde, Armin Stamm, Jochem Henkelmann
Life of this patent
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Abstract
In a process for preparing isocyanates by reacting the corresponding primary amines with phosgene in an inert solvent, use is made of from 0.01 to 50 mol % of a sulfoxide, a sulfone or a mixture thereof, based on the total amount of primary amine and isocyanate formed in the reaction solution.
Claims9
A process for preparing isocyanates which comprises reacting the corresponding primary amines with phosgene in an inert solvent in the presence of from 0.01 to 50 mol % of a sulfoxide, a sulfone or a mixture thereof, based on the total amount of primary amine and isocyanate formed in the reaction solution.
Dependencies are inferred from the claim text.