Method for inhibiting polymerization of conjugated dienes

Details Method for inhibiting polymerization of conjugated dienes Method for inhibiting polymerization of conjugated dienes

1980-11-25

1982-09-07

Sever, Frank

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For inhibiting or preventing a polymerization reaction

585810, 585833, 585865, B01D 340

Patent

active

043482600

ABSTRACT:
In a process for separating a conjugated diene from a hydrocarbon mixture containing the conjugated diene by extractive distillation using dimethyl formamide as an extractive solvent, a method for inhibiting polymerization of the conjugated diene in the dimethyl formamide at a high temperature which comprises using furfural and furfural polycondensates as polymerization inhibitors, and controlling the amounts of the polymerization inhibitors such that about 0.01 to about 2% by weight, based on the solvent, of furfural and about 0.5 to about 10% by weight, based on the solvent, of the furfural polycondensates are present in a total amount of about 1 to about 12% by weight, based on the solvent, throughout the entire separating process.

REFERENCES:
patent: 3405189 (1968-10-01), Sakuragi et al.
patent: 3436438 (1969-04-01), Takao et al.

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