Key technologies of solvent recovery machines in the optical industry
I. Key Technical Requirements for Solvent Recovery Machines in the Optical Industry
Due to the particularity of optical solvents, higher requirements are imposed on their recovery machines:
High-purity recycling:
Precision distillation technology: Utilizing high-efficiency packed towers, multi-stage condensation and other techniques to ensure the purity of the distillate.
Precise temperature control: The distillation temperature must be precisely controlled to prevent solvent decomposition or impurity carryover.
Anti-corrosion materials:
The components that come into contact with solvents (such as the reactor body, condenser, and pipelines) must be made of stainless steel (e.g., 304/316L) or coated with Teflon to prevent metal ion contamination and ensure that the recovered solvents do not affect the surface of optical components.
Safety and explosion-proof design:
Explosion-proof motors, explosion-proof electrical appliances, explosion-proof control cabinets (Ex d IIB T4 or higher grades).
Nitrogen protection system: Nitrogen is introduced during distillation and cooling to prevent the formation of explosive mixtures of solvent vapor and air.
Multiple safety devices: over-temperature and over-pressure protection, pressure relief valve, grounding protection, automatic shutdown, etc.
Special design for optical solvents:
Low-residue design: Reduce the residual liquid at the bottom of the reactor and increase the recovery rate.
Prevent cross-contamination: Easy to clean and maintain, avoiding the mixture of different batches or types of solvents.
Optional features: Multi-solvent separation function (for mixed waste solvents), high-precision filtration system (to remove particulate matter).
II. Typical Workflow (Taking the fully automatic model as an example)
Feeding: Pour the collected waste solvents through the filter device into the distillation pot of the recovery machine.
Set parameters: Set the distillation temperature, time, etc. on the control panel (preset programs are available for different solvents).
Start-up operation: One-click start-up, the device automatically completes:
Heating and distillation → Steam is fractionally distilled through a packed column → Condensation and liquefaction in the condenser → Clean solvent flows into the recovery tank.
Nitrogen protection is fully involved throughout the process.
The security system is under real-time monitoring.
Collection and Cleanup:
After distillation is completed, the recovered solvent can be taken out and reused directly.
The small amount of high-boiling-point impurities (waste liquid) remaining at the bottom of the pot is treated as hazardous waste for centralized disposal, and the quantity has been greatly reduced.
