Cryogenic Solvent Recovery
Cryogenic Condensation for Solvent Recovery & Abatement
Cryogenic Solvent Recovery separates condensable vapours from an effluent vent stream coming from production process equipment in order to reduce pollution and recover the solvents for reuse or disposal.
Safer, flexible, and economical, this is ideal for high-solvent concentration in vent gases, especially where liquid nitrogen is available as a utility. Adsorption or carbon beds are difficult to handle safely with high solvent concentrations. Cryogenic condensation is safer than thermal oxidizers and is non-destructive, which means high-value product in the chemical, pharma, and petrochemical industries can be recovered.
Cryogenic condensation is a reliable solution for treating vent gases with Volatile Organic Compounds (VOC) or Hazardous Air Pollutants (HAP). Cryogenic Solvent Recovery and Adsorption with Dry Regeneration can work together. If the gas flow rate is too large for only a cryogenic solvent recovery, then adsorption can be used. When an adsorption abatement system is used, the media must be regenerated after a period of time. That regeneration step can be via cryogenic recovery which allows for dry regeneration.
The separation process by condensation and partial solidification of VOCs is based on:
- The decrease of the vapor pressure of the compounds at lower temperatures, in vapor/liquid and vapor/solid equilibrium
- Using liquid nitrogen as the cooling fluid in a condenser
- Emission limit levels (ppm) and/or yield of recovery (%) corresponds to the condenser outlet temperature
- Control of the condenser outlet temperature is by automatic injection of liquid nitrogen in the condenser coils
- The liquid nitrogen used in the system is not put in contact with the process circuit and is in a separate circuit under pressure, and therefore the nitrogen can be reused in gas form.