Olin Corporation

Louis C Hirdler

Raymond J Smialek

Michael C Fullington

John A Bartoszek

Concentrated slurries of cyanuric acid are produced in a process which comprises feeding urea to a hot solvent. In the hot solvent, the urea is pyrolyzed to produce a reaction mixture of cyanuric acid particles in the solvent. Agitation of the reaction mixture forms a suspension of cyanuric acid particles. At cyanuric acid concentrations of from about 20 to about 50 percent by weight, the cyanuric acid particles are settled from the suspension to produce a concentrated slurry phase and a supernatent solvent phase. The concentrated slurry phase is then separated from the solvent phase. The process produces concentrated cyanuric acid slurries which minimize the complexity and cost of solvent recovery, reduces energy requirements for heating the reaction mixture and recovering the solvent, and maximizes heat transfer efficiency during the pyrolysis reaction.

Process for the production of concentrated cyanuric acid slurries

A process is provided for solvent recovery from a hot gaseous mixture comprised of ammonia, carbon dioxide, cyanuric acid particles, and solvent vapors. The process comprises scrubbing the hot gaseous mixture with a liquid solvent to remove the cyanuric acid particles and to form a scrubbed gaseous mixture. The scrubbed gaseous mixture is cooled to form condensed liquid solvent and a cooled gaseous mixture containing traces of the solvent. The temperature of the cooled gaseous mixture is kept above that at which ammonium carbamate is formed by the reaction of ammonia with carbon dioxide. Condensed liquid solvent is separated from the cooled gaseous mixture and the cooled gaseous mixture is contacted with additional liquid solvent to form a substantially solvent-free gaseous mixture.

Solvent recovery from gaseous mixtures produced in the manufacture of

A process for recovering chlorine values from an aqueous solution of a chloroisocyanuric acid compound is disclosed. After reacting a mineral acid with the aqueous solution to form an acidified reaction mixture containing dissolved chlorine, the reaction mixture is fed to a stripping column which employs an inert gas to remove the dissolved chlorine. The stripping column is maintained to provide a continuous liquid phase and a non-continuous gas phase. Chlorine gas is readily recovered in a vessel such as a scrubber. Cyanuric acid may be subsequently recovered from the chlorine-depleted solution.

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Lake Charles, LA, United States of America

Louis C Hirdler