| 摘要 |
1385306 Purification of p-nitrophenol RHONE-POULENC SA 13 March 1973 [14 March 1972] 12069/73 Heading C2C p-Nitrophenol is prepared by nitrating phenol with HNO 3 , isolating the crude mixture of nitrophenols thus obtained by decanting the residual aqueous solution of HNO 3 , and steam distilling the o-nitrophenol to obtain a crude aqueous broth of p-nitrophenol, crystallizing the p-nitrophenol by cooling the crude aqueous broth containing dissolved p-nitrophenol, when the broth contains NaHSO 3 in a concentration of at least 0À5% and is at a pH of 5À4 to 6À4, and finally separating the crystals of p-nitrophenol.
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