Recovery of 1,3-butadiene

Recovery of 2-pyrrolidone from dilute alkaline solutions

Recovery of 4-methyl-2-pentanone from acetic acid by distillatio

Recovery of alkylene glycols by distillation with aqueous organi

Recovery of caprolactam from oligomers and/or polymers of caprol

Recovery of carboxylic acids from oxo residues

Recovery of isoprene from a C.sub.5 -hydrocarbon mixture

Recovery of metal chlorides from their complexes by molten salt

Recovery of products from toluenediisocyanate residues

Refining tetrahydrofuran

Removal of aldehydes from .alpha., .beta.-olefinically unsaturat

Removal of chloroprenes from ethylene dichloride

Removal of cyanides from acetonitrile

Removal of iodine or iodide impurities

Removal of iodine or ioidide impurities

Removal of trace aldehydes from carboxylic acids

Selective hydrogenation of vinyltoluene

Separation of a C.sub.4 -hydrocarbon mixture essentially contain

Separation of aliphatic diacids from adipic acid admixtures ther

Separation of heteropoly compounds from polyethers, polyesters a