Continuously operating dryer with solvent recovery - uses inert drying medium obtained by combustion of mixt. with low solvent vapour concentration

摘要

The continuously operating dryer is used for removing inflammable or toxic solvents from a material. The dryer is charged with inert drying medium to ensure oxygen free drying. The drying medium is separated from solvent in the drying cycle. The drying agent is circulated in main loop and incompletely stripped of solvent for solvent recovery. The drying medium is drawn from a solvent free source. The inert medium is obtained by burning part of the drying medium drawn from a low solvent containing branch of the main loop. For this purpose the solvent content in the loop is reduced to level suitable for burning.