Process for the purification of para-nitrophenol

Details Process for the purification of para-nitrophenol Process for the purification of para-nitrophenol

1973-03-13

1976-05-04

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 7926

Patent

active

039548929

ABSTRACT:
In the nitration of phenol with nitric acid, decantation of the residual acid, and steam distillation of ortho-nitrophenol to leave an aqueous distillation residue of para-nitrophenol, a cleaner purer crystalline para-nitrophenol product is obtained by cooling the hot distillation residue when it contains at least 0.5% of sodium bisulphite and is at pH 5.4 to 6.4.

REFERENCES:
patent: 2802883 (1957-08-01), Dietzler
patent: 2811565 (1957-10-01), Alexander et al.
patent: 2868844 (1959-01-01), Coffield et al.

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