Solvent traps are devices used to capture and recover volatile organic compounds (VOCs) and other harmful chemicals, and are widely used in chemical, pharmaceutical, printing and other industrial processes. According to different designs and functions, solvent traps can be divided into the following categories:
1. Condensation solvent trap: suitable for the recovery of high boiling point solvents.
2. Adsorption solvent trap: suitable for the recovery of low concentration solvents.
3. Absorption solvent trap: suitable for the recovery of solvents with specific chemical properties.
4. Membrane separation solvent trap: suitable for the separation and recovery of molecules of specific sizes.
5. Biofilter bed solvent trap: an environmentally friendly solvent trap.
6. Thermal oxidation solvent trap: usually used to treat difficult-to-recover solvents.
The working principle of the solvent trap mainly involves physical and chemical methods, including condensation, adsorption and other processes to capture and recover solvents. The following are the working principles of common solvent traps:
Cryogenic condensation principle
1. Lowering the temperature: Cool the organic solvent vapor in the exhaust gas to below its condensation point through the refrigeration system.
2. Condensation and liquefaction: The vapor condenses into liquid after being cooled and is separated from the airflow.
3. Recovering the solvent: The condensed liquid solvent is collected in a storage container for recycling and reuse.
Adsorption principle
1. Physical adsorption
– Porous materials: Use porous materials such as activated carbon and silica gel to adsorb solvent molecules by using their high specific surface area.
– Gas contact: The exhaust gas passes through the adsorbent bed and the solvent molecules are adsorbed on the solid surface.
2. Chemical adsorption
– Catalytic reaction: Use a catalyst to react chemically with the solvent molecules to convert them into stable substances.
– Capture gas: The reacted substance is fixed on the adsorbent and removed from the airflow.
Absorption principle
1. Physical absorption
– Absorbent: Use a liquid absorbent that has an affinity with the solvent, such as oil or water.
– Contact mass transfer: the waste gas and the absorbent are fully contacted in the packed tower, and the solvent is dissolved in the absorbent.
2. Chemical absorption
– Chemical reaction: the absorbent and the solvent react chemically to form a stable compound.
– Separation and recovery: the solvent is separated from the absorbent by distillation and other methods to achieve recovery.
The solvent trap effectively recovers organic solvents in the waste gas through the above principles, reduces environmental pollution, saves resources, and improves economic benefits.
The following factors need to be considered when choosing a suitable solvent trap:
– Chemical properties and concentration of the solvent
– Flow rate and temperature of the waste gas
– Recovery efficiency and cost
– Environmental regulations and emission standards
The wix solvent trap of OSIAS is not only of high quality, but also easy to install, so you can buy it with confidence.
