Olin Corporation

Arco Chemical Technology, L.p.

Lyondell Chemical Company

Robert W Mason

Peter C Imm

Thomas C Parker

Robert T Brooker

Majid N Keyvani

Paul J Craney

Thomas W Offill

Kent J Bordelon

Larry K Butler

Joseph P Bridges

Farhad Fadakar

R K Steely

A phosgene-free process for producing organic isocyanates reacts an organic fomamide with a diorganocarbonate and thermolyzing the reaction product to obtain the corresponding organic isocyanate. Byproducts may be cycled back to the reaction or recycled to produce additional starting materials. The process product organic isocyanates in high yield.

Non-phosgene route to the manufacture of organic isocyanates

The present invention relates to a process for isolating aliphatic isocyanate monomer(s) from a liquid or viscous paste composition comprising polymeric isocyanate residues and the aliphatic isocyanate monomer(s), and for isolating solid polymeric isocyanate residue from said composition. Also disclosed is the aliphatic isocyanate monomer(s) and the solid polymeric isocyanate byproduct produced by this process.

Isocyanate residue purification

Aromatic nitration reactions and, more specifically, a process for nitrating benzene to produce dinitrobenzene or mononitrobenzene in the absence of sulfuric acid and in the absence of any dipolar aprotic solvent.

Process for the production of dinitrobenzene and mononitrobenzene

Aromatic nitration reactions and, more specifically, a process for nitrating toluene to produce dinitrotoluene in the absence of any dipolar aprotic solvent.

Process for the production of dinitrotoluene

The present invention relates to a process for purifying an aromatic nitration product mixture comprising a nitrated aromatic compound, water, and nitric or sulfuric acid which comprises without regard to sequence: (a) removing at least a portion of said water from said product mixture by contacting and reacting said water in said mixture with magnesium nitrate trihydrate to form magnesium nitrate pentahydrate or magnesium nitrate hexahydrate and removing said magnesium nitrate pentahydrate or magnesium nitrate hexahydrate from said nitrated aromatic compound in said product mixture, and (b) removing at least a portion of said acid from said product mixture by contacting and reacting said acid with an ionic or non-ionic absorbent to form a reacted absorbent and removing said reacted absorbent from said nitrated aromatic compound in said product mixture.

Process for purifying aromatic nitration products

The present invention relates to a process for making an isocyanate which comprises the steps of: (a) reacting an amine with dimethyl carbonate in the presence of a hydrolase enzyme catalyst, preferably at a temperature not exceeding 50.degree. C. to form a methyl urethane, and (b) subjecting said methyl urethane to an elevated temperature in order to thermally cleave the urethane to produce an isocyanate.

Enzyme catalyzed synthesis of methyl urethanes

Aromatic nitration reactions and, more specifically, a process for nitrating toluene to dinitrotoluene. The process involves a liquid phase nitration reaction of anhydrous nitric acid and toluene in a molar ratio of between about 5:1 and about 9:1 of nitric acid to toluene in a reactor at a reaction temperature of between about 40.degree. C. and about 70.degree. C., in the absence of sulfuric acid and in the absence of any dipolar organic solvent, to produce a mixture containing dinitrotoluene, and isolating said dinitrotoluene by contacting said mixture with a phase separating effective amount of an alkali or alkaine earth metal nitrate salt to cause phase separation of said dinitrotoluene.

A process for the purification of crude cyanuric acid containing aminotriazine compounds as impurities which comprises digesting the crude cyanuric acid in an aqueous solution containing low concentrations of a mineral acid. The mineral acid is, for example sulfuric acid, nitric acid, hydrochloric acid, or phosphoric acid. The digestion is operated at a temperature in the range of from about 120.degree. C. and about 220.degree. C. and autogenous pressure using a stoichiometric ratio of sulfuric acid to aminotriazine compounds of less than 1, to produce a slurry of purified cyanuric acid in an acid depleted ammonium sulfate solution. Purification of cyanuric acid by the process of the present invention permits a substantial reduction in the amounts of acid used in the digestion and the base required for ammonia stripping and neutralization of the spent acid from the digestion. This provides significant cost savings in the digestion and waste treatment methods.

Purification of cyanuric acid

This invention relates to a process for nitrating toluene to dinitrotoluene and phase separation of the product using an inorganic salt as a phase separation agent.

Process for the production of dinitrotoluene using an inorganic salt as

Nitration of benzene or toluene, and more specifically to such a reaction in a molten nitrate salt medium.

Nitration of benzene or toluene in a molten nitrate salt

A process for producing urea cyanurate which comprises reacting an aqueous solution of urea with cyanuric acid at a temperature below the melting point of urea provides reaction conditions which minimize urea decomposition and are energy efficient. The urea cyanurate product can be used directly in the manufacture of cyanuric acid in a process which minimizes the build up of scale on the reactor walls. The cyanuric acid product has reduced concentrations of by-products such as ammelide and ammeline.

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Lake Charles, LA, United States of America

Robert W Mason