Two-stage crystallization of nitrilotriacetonitrile from a...

Details Two-stage crystallization of nitrilotriacetonitrile from a... Two-stage crystallization of nitrilotriacetonitrile from a...

C - Chemistry, Metallurgy

07

C

260/562.7

C07C 121/43 (1985.01)

Patent

CA 1201727

ABSTRACT TWO-STAGE CRYSTALLIZATION OF NITRILOTRIACETONITRILE FROM A HOT SOLUTION A process is disclosed for producing crystalline nitrilotriacetonitrile from a solution of nitrilotri- acetonitrile and water in excess of 95°C, comprising: a.) cooling the nitrilotriacetonitrile-water solution in a first stage to the range of about 70°C to about 90°C, preferably from about 80°C to about 90°C, and more preferably about 85°C, to produce a nitrilotriacetonitrile water slurry; and b.) further cooling the nitrilotliacetonitrile- water slurry in a second stage to below about 35°C, carried out either continuously or in a batch process. Cooling in the first stage is preferably accomplished by recycling cooled nitrilotriacetonitrile-water slurry from the second stage. Cooling in the second stage is preferably accomplished by vacuum cooling.

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