Recovery of polymerization inhibitor

Details Recovery of polymerization inhibitor Recovery of polymerization inhibitor

1974-12-26

1976-05-25

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260621A, 260627R, 260669A, C07C 7924, C07C 3728

Patent

active

039593959

ABSTRACT:
A process is provided for recovery and re-use of dinitrophenols employed as inhibitors of polymerization in the distillation and purification of styrene. The styrene still residues commonly referred to as tar or tars are treated with an aqueous hydroxide at a controlled pH, the phases are separated, the aqueous phase is treated with an acid and an organic solvent at a controlled pH and the resulting organic phase is recycled to a suitable point in the styrene purification system. The recycled solution is a more effective inhibitor than the dinitrophenol originally employed.

REFERENCES:
patent: 3335185 (1967-08-01), Dykes

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