In the process for preparing a urethane, particularly an aromatic urethane, by the reaction of an organic nitro compound, particularly an aromatic nitro compound, carbon monoxide, and an organic hydroxy compound in the presence of a catalyst, the improvement which comprises employing as said catalyst rhodium oxide, particularly substantially amorphous rhodium oxide, and optionally conducting the reaction in a nitrilic solvent.

Process for producing urethane from nitro compounds, hydroxyl compounds and carbon monoxide using rhodium oxide catalysts

In the process for preparing a diurethane, particularly an aromatic diurethane, by the reaction of an organic dinitro compound, particularly an aromatic dinitro compound, carbon monoxide, and an organic hydroxyl compound in the presence of a catalyst, the improvement which comprises employing as said catalyst rhodium oxide, particularly substantially amorphous rhodium oxide, and carrying out the reaction in two stages, the first stage being carried out at a first temperature and pressure and the second stage being carried out at a higher temperature and pressure, and optionally conducting the reaction in a nitrilic solvent.

Process for producing diurethane from dinitro compounds, hydroxyl compounds and carbon monoxide

In the process for preparing isocyanate, particularly aromatic isocyanate, by the reaction of an organic nitro compound, particularly an aromatic dinitro compound with carbon monoxide in the presence of a catalyst, the improvement which comprises employing as said catalyst rhodium oxide, particularly substantially amorphous rhodium oxide, and conducting the reaction in the presence of a promoter quantity of a nitrilic solvent, such as acetonitrile.

Process for producing isocyanate from nitro compounds and carbon monoxide using rhodium oxide catalysts

A process for production of aromatic isocyanates by the reaction of an aromatic nitro compound with carbon monoxide at an elevated temperature under an elevated pressure in the presence of a catalyst, which is characterized in that the catalyst is a product obtained by contacting a halogen-containing platinum group metal compound with a high molecular weight compound having a nitrogen-containing heteroaromatic ring in the molecule and is advantageous in that the objective aromatic isocyanates can be produced in excellent yields and the catalyst can be readily separated and used repeatedly.

Process for production of aromatic isocyanates

In the process for providing an organic isocyanate by the reaction of an organic nitro compound with carbon monoxide in the presence of a noble metal based catalyst, the improvement which comprises performing the reaction in the presence of an unsaturated organic compound having at least one multiple bond conjugated to another multiple bond in selected aliphatic or cycloaliphatic systems or in the presence of an unsaturated organic compound having at least one multiple bond conjugated to an aromatic hydrocarbon nucleus.

E Smith

Papers

Catalytic process for converting aromatic nitro compounds to aromatic isocyanates