Solvent Recovery and DMF Recycling Systems
topic
DMF recovery from PU wet coagulation washing water uses vacuum distillation or multi-effect evaporation to concentrate the dilute DMF-water mixture discharged from washing baths, recovering DMF at 85 to 95 percent efficiency for reuse in coating solution preparation, with purified DMF meeting purity specifications for reuse and residual DMF in treated process water below 0.01 percent before discharge to comply with wastewater DMF concentration limits.
Role
Reduces the production cost and environmental impact of DMF-based PU wet coagulation by recovering and recycling the major solvent component whose cost and regulatory restrictions would make single-use consumption economically and environmentally unacceptable, with DMF recovery system efficiency being a critical economic factor in the viability of solvent-based PU coagulation production that increasingly faces competitive pressure from water-based PU alternatives.