摘要:
A process for the recovery of bisphenol-A from a bisphenol-A effluent stream utilizes a series of steps to remove, in sequence (1.) isomers of bisphenol-A, (2) acidic contaminants, (3) particulate contaminants, (4) phenol (5) colored by-products and co-products of the bisphenol-A process and (6) tars and colored contaminants.
摘要:
A method of separating a polymer-solvent mixture is described wherein a polymer-solvent mixture is heated prior to its introduction into an extruder comprising an upstream vent and/or a side feeder vent to allow flash evaporation of the solvent, and downstream vents for removal of remaining solvent. The one-step method is highly efficient having very high throughput rates while at the same time providing a polymer product containing low levels of residual solvent.