Purification of triazoles

Details Purification of triazoles Purification of triazoles

1978-05-22

1979-10-09

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

203 38, 203 62, 203 91, 548257, B01D 334, C07D24904

Patent

active

041705211

ABSTRACT:
A method for purifying benzotriazole, tolyl-triazole or mixtures of the two is disclosed. The method includes the steps of vacuum distillation of crude triazole and collection of the condensate. The crude triazole contains color bodies, diazotizable impurities which are color body precursors, or both. The color of the distilled triazole is improved by adding to the crude triazole, prior to vacuum distillation, an amount of formaldehyde sufficient for reaction with an appreciable proportion of the color bodies, the color body precursors, or both.

REFERENCES:
patent: 2388499 (1945-11-01), Riethof
patent: 2744857 (1956-05-01), Kemp
patent: 2861078 (1958-11-01), Miller
patent: 3227726 (1966-01-01), Levy
patent: 3334054 (1967-08-01), Howard et al.
patent: 3564001 (1971-02-01), Long

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