Assertion: simple distillation | /r/HasProperty | combined with countercurrent fractionation
Facets:
value: often
type: TEMPORAL
Source sentences:
text: To improve mixture separation, simple distillation is often combined with countercurrent fractionation; here the vapors formed in the still are partly condensed in a fractionating column, the condensate (reflux) is continuously returned to the still, and the vapors remaining after the fractionating column go to a condenser, from which the distillate drops into the collector.