公开(公告)号：US3954892A

公开(公告)日：1976-05-04

申请号：US340903

申请日：1973-03-13

Applicant: Andre Perrin

Inventor： Andre Perrin

IPC: C07C205/22 ,  C07C67/00 ,  C07C201/00 ,  C07C201/16 ,  C07C79/26

CPC classification number: C07C201/16 ,  C07C201/08 ,  C07C205/22

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.

Abstract translation: 在用硝酸硝化苯酚的同时，将残余的酸进行硝酸化，并将邻硝基苯酚蒸汽蒸馏除去对硝基苯酚的水蒸馏残余物，通过冷却热蒸馏残渣得到更清洁的纯的对硝基苯酚产物， 它含有至少0.5％的亚硫酸氢钠，pH在5.4至6.4。