Noun
entrainer (plural entrainers)
(chemistry) A substance used for entraining.
By adding ethyl acetate as an entrainer, it is possible to distill away the azeotrope and leave nearly pure acetic acid as the residue. Source: Internet
Extractive distillation Extractive distillation is similar to azeotropic distillation, except in this case the entrainer is less volatile than any of the azeotrope's constituents. Source: Internet
Chemical action separation Another type of entrainer is one that has a strong chemical affinity for one of the constituents. Source: Internet