Method for recovery of a phenolic polymerization inhibitor

Details Method for recovery of a phenolic polymerization inhibitor Method for recovery of a phenolic polymerization inhibitor

1988-03-21

1989-09-05

Caldarola, Glenn

Mineral oils: processes and products

Refining

Organic acid or phenol contaminant removal

208321, 208333, 203 9, 203 56, 585835, C07C 3768, C10G 1700

Patent

active

048635871

ABSTRACT:
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.

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patent: 4406780 (1983-09-01), Gould et al.

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