Process for the purification of p-nitrophenol

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

1973-05-14

1976-01-20

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260622R, C07C 3722, C07C 3740

Patent

active

039339297

ABSTRACT:
In a purification process for p-nitrophenol obtained by nitration of phenol, separation of crude nitrophenols, steam distillation to remove o-nitrophenol, and cooling the broth obtained when it contains more than 0.5% sodium bisulphite and is at pH 5.4 to 6.4 to deposit crystals of p-nitrophenol, an improvement consists in stirring the crystals with water at 55.degree.-85.degree.C to give a mixture containing 10-40% excess of p-nitrophenol over the solubility at that temperature, separating the upper layer of p-nitrophenol in water obtained, cooling it to 40.degree.-50.degree.C and separating the layer of water in p-nitrophenol, cooling the latter to below 30.degree.C and collecting the crystals deposited.

REFERENCES:
patent: 2868844 (1959-01-01), Coffield
patent: 3510527 (1970-05-01), Prosser
patent: 3752858 (1973-08-01), Odenweller
Journal Chemical Society (1921) pp. 1003-1004, London.
Berichte (1902) Band I pp. 455-456, Vol. 35.
Guttermann "Manuel Practique Chimie Organique" (1946), pp. 247-249.

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