Method for recovering solvents

Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials

Reexamination Certificate

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C203S069000, C585S867000

Reexamination Certificate

active

07550065

ABSTRACT:
A method for recovering a solvent from its mixture containing oligomers extracted from grafted polyolefins is disclosed. The method includes distilling the solvent from the mixture in the presence of a naphthalene compound. The method of the invention significantly increases the solvent recovering yield without causing the vessel fouling.

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Coulson et al , “Chemical Engineering” vol. Two, Unit Operations , Third Ed. , 1977, p. 412.

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