Molecular still, brush-type

Distillation from a brush-type molecular still separated the isolated lignins into three fractions containing alkyl-substituted monomeric phenols in the most volatile fraction, a mixture of monomeric phenolic alcohols and alkyl-substituted dimeric phenols in the intermediate fraction, and nonvolatiles which presumably contained dimeric phenolic alcohols and higher molecular weight material. Unfortunately, separation of monomeric alcohols and alkyl-sbustituted dimers was not complete, and this greatly hampered separation of the alkyl-substituted dimers in later chromatographic separations. 

Residue drain Fig. 1-40. Brush-type molecular still. (Consolidated Electrodynamics Corp.)... 

---