Distillation and Purification Systems

Dürr MEGTEC designs, builds and installs distillation systems to separate water and solvent, and solvents from each other. These can be continuous or batch processes, as well as vacuum, atmospheric or pressure, depending on the solvents and purities required.

These systems are suitable to:

  • Treat the effluent from a regenerable carbon adsorption solvent recovery system
  • Separate solvent mixtures into individual solvents in chemical, pharmaceutical, and other specialty industries to make them suitable for recycle, and reuse
  • Remove solvent contaminants from wastewater to make the water suitable for disposal, saving hazardous waste disposal costs or surcharge costs

 Design features and performance advantages:

  • Designs are based on long-term experience and expertise
  • 3D design to maximize operability and maintainability
  • Distillation column internals are optimized for the specific application (random packing, structured packing, floating and fixed valve trays)
  • Heat recovery to minimize operating costs
  • Pre-assembly on skids to minimize installation time and cost

B&W MEGTEC Distillation & Purification Systems

Liquid Purification and Distillation

Water-soluble solvents and multiple-solvent mixtures may need to be separated from the water and/or separated into their individual components prior to reuse. Dürr MEGTEC offers complete extractive and azeotropic multicomponent distillation systems for the separation and purification of solvent mixtures.
Depending on customer and process requirements, our systems can be designed for either continuous or batch operations. 
In applications where the decanted water phase contains solvent levels that cannot be sent directly to drain or existing water treatment facilities, we provide a steam or air stripping column for solvent removal prior to discharge.
In steam stripping, steam is admitted at the base of the column. As the contaminated feed water flows downward, solvents concentrate in the top of the column and are removed overhead in a condenser. The product then may be sent to storage or returned to the decanter.
In an air stripping operation, air is passed through the column counter-current to the flow of liquid. Solvent transfers to the air stream, which may be returned to the inlet of the carbon adsorption unit, and purified water suitable for disposal is discharged.
Typical processes or product applications that use recovered solvents for reuse are:
  • Chemical/petrochemical
  • Pharmaceutical
  • Semiconductor and electronics
  • Membrane production
  • Soil vapor extraction and groundwater remediation
  • Degreasing
  • Foam production
  • Rubber-coated fabric production
  • Paper, film and foil coating
  • Publication and packaging gravure printing