Purifying lactams - by treating vapours with active carbon
摘要
<p>Method for purifying lactams by passing their vapours at temps. higher than their condensation point over or through activated carbon. Residence time is pref. 1-5 (esp. 2-3) sec. For epsilon-caprolactam, temp. used is 180-300 degrees C. Inert gas is opt. present. The carbon can be regenerated by solvent-extraction or superheated steam.</p>
