Solvent Recovery

An alternative to solvent replacement, as a mechanism to reduce cost and waste, is in–process solvent recovery utilizing vacuum technology. The usage of solvent vapor recovery equipment incorporating vacuum pumps and condensate receivers is economically preferable to raw materials substitution.

Industries such as chemical, pharmaceutical, metal powders, flavor and fragrance, and PET solid-state manufacturing use solvent recovery vacuum systems. The solvent recovery process is typically as follows.

  1. solvent recovery condenser/receiver tank, liquid ring vacuum systemFilter / Dryers
  2. A solvent is oftentimes present in a liquid state mixed with the desired product.
  3. The solvent is then vaporized by applying vacuum and/or heat.
  4. The solvent is then condensed and stored in a vacuum receiver or drained directly in a liquid ring vacuum pump.
  5. Accumulated solvent is pumped or drained to a solvent storage tank.

Solvent recycling vacuum systems are regularly used in conjunction with the following types of process equipment:

  • Vacuum Dryers
  • Batch Reactors
  • Granulators

Wintek generally utilizes liquid ring vacuum pumps sealed with one of solvents in incoming process stream to maximize recovery and reduce potential contamination/environmental concerns.

The complexity associated with utilizing a solvent-sealed vacuum system is the calculation of the size of the liquid ring vacuum pump, as well as understanding how different solvent’s properties affect a pump’s performance. Liquid ring vacuum pumps sealed with a solvent other than water require advanced sizing calculations that most organizations are unable to perform. Wintek utilizes proprietary internally-developed liquid ring vacuum pump sizing software to size and design solvent-sealed process vacuum systems.

Wintek has experience designing for and helping customers recover the following solvents:

AnilineDiMethyl-CarbonateMethyl Ester-Soy
BenzeneD-LimoneneMethyl Methacrylate
ButaneDMS LHC FTMethylene Chloride
ButanolFurfuralMethyl Isobutyl Ketone (MIBK)
Butyl AcetateGlycerolMineral Spirits
Carbon TetrachlorideHeptanePropanol
ChlorobenzeneHexanePropylene Oxide
Dethylamine (DEA)HexeneStyrene
Dibutylamine (DBA)IsoPar CTetrahydrofuran
DiChloroMethane (DCM)Isopropyl Alcohol (IPA)Therminol
Dimethyl AcetamideMethyl Ethyl Ketone (MEK)Toluene
Dimethyl Formamide (DMF)MethanolVinyl Acetate
Dimethyl Sulfoxide (DMSO)Methyl AcrylateWater
Dimethylamine (DMA)Methyl ChlorideXylene