Separation and recovery of polychlorinated phenols

Details Separation and recovery of polychlorinated phenols Separation and recovery of polychlorinated phenols

1975-03-21

1977-04-05

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

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

203 38, 203 91, 260623H, C07C 3936

Patent

active

040160475

ABSTRACT:
Polychlorinated phenols (e.g., pentachlorophenol) of improved color are made by vacuum distilling polychlorinated phenols containing dark color-forming impurities in the presence of a color inhibitor such as free radical-acting substances (e.g., free radical-acting compounds of the phenol, hydroquinone, organic sulfur derivative, organic phosphite, amine and aldehyde type). In addition, the chlorodioxin content of the impure pentachlorophenol (generally about) 2,000 p.p.m.) is reduced to a residual chlorodioxin content of less than 25 p.p.m. during distillation.

REFERENCES:
patent: 3403186 (1968-09-01), Schlichting et al.
patent: 3454654 (1969-07-01), Hobbs
patent: 3770835 (1973-11-01), Garabedian
patent: 3852160 (1974-12-01), Watson et al.
patent: 3852161 (1974-12-01), Yoshimme et al.
patent: 3909365 (1975-09-01), Christena
Biltz et al., Berichte 37 4017, 4018 (1904).

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