公开(公告)号：US4863587A

公开(公告)日：1989-09-05

申请号：US171372

申请日：1988-03-21

申请人： Takashi Tonari ,  Yasuhiko Ikeda

发明人： Takashi Tonari ,  Yasuhiko Ikeda

IPC分类号： C07C7/04 ,  C07C1/00 ,  C07C7/20 ,  C07C15/46 ,  C07C67/00 ,  C07C201/00 ,  C07C201/16 ,  C07C205/23 ,  C07C251/46

CPC分类号： C07C201/16 ,  C07C7/20

摘要： A phenolic polymerization inhibitor is recovered from a styrene distillation residue containing the phenolic polymerization inhibitor by a method which comprises extracting the inhibitor from the styrene distillation residue with an oxygen-containing organic solvent having not more than 6 carbon atoms, adding an aromatic hydrocarbon solvent to the oxygen-containing organic solvent phase consequently obtained, and subjecting the resultant mixture to distillation thereby separating the mixture into a solution of the phenolic polymerization inhibitor in the aromatic hydrocarbon solvent and the oxygen-containing organic solvent. The recovered solution is put to use as a polymerization inhibitor either in the unmodified form or in a form separated from the aromatic hydrocarbon solvent.