Catalytic carbonylation of nitro compounds to prepare isocyanates

Abstract

Abstract THE PROCESS FOR PREPARING AN ORGANIC ISOCYANATE BY REACTING AN ORGANIC NITRO COMPOUND WITH CARBON MONOXIDE IN THE PRESENCE OF A CATALYST SYSTEM COMPRISED OF A MIXTURE OF AN OXYGEN-CONTAINING SULFUR COMPOUND AND A HALIDE OF A NOBLE METAL. THE OXYGEN-CONTAINING SULFUR COMPOUNDS INCLUDE ORGANIC SULFITES, ORGANIC SULFOXIDES, ORGANIC SULFONES, AND ALKALI METAL SULFITES, AND DERIVATIVES THEROF. TETRAMETHYLENE SULFOXIDE, SODIUM SULFITE, AND DIBENZOTHIOPHENE SULFONE REPRESENT SOME OF THE PREFERRED OXYGEN-CONTAINING SULFUR COMPOUNDS. THE NOBLE METAL HALIDE IS PREFERABLY A HALIDE OF PALLADIUM, RHODIUM, IRIDIUM, PLATINUM, OR MIXTURES THEREOF. THE CATALYST SYSTEM MAY ALSO INCLUDE A THIRD COMPONENT SUCH AS MOLYBDENUM TRIOXIDE OR ANOTHER METAL OXIDE.

Inventors

• 👤 Eric Smith

Bibliographic Details