Selection Guide for Solvent Recovery Equipment in the Optical Products Industry
I. Key Components and Features of the System
A complete solvent recovery system for the optical industry typically includes:
Pre-treatment unit: Waste solvent storage tank, filter (for removing particulate matter), neutralization tank (if acidic/alkaline impurities are present).
Core recovery unit: Distillation column (usually designed for vacuum), reboiler, condenser, vacuum system, control system.
Post-treatment unit: Molecular sieve adsorption tower, terminal precision filter (0.1 microns or even finer).
Storage and transportation: High-purity recovered solvent storage tanks (typically made of stainless steel 316L, with inner walls electrolytically polished) are pressurized and transported using high-purity nitrogen to prevent contamination.
Advanced control system: Fully automatic PLC/DCS control, real-time monitoring of temperature, pressure, vacuum degree, flow rate, and solvent purity (online moisture meter, purity analyzer) to ensure stable and qualified output.
II. Considerations for Selection and Application
Solvent type and composition: Is it a single solvent or a mixed solvent? What are the main impurities (water, oil, resin, particles)?
Processing capacity and recovery rate: The scale of the equipment is determined based on the average daily generation of waste solvents. The recovery rate requirement (usually > 90%).
Product purity requirements: Clearly specify the standards to be met (such as moisture content, acid value, non-volatile residue, metal ion content, etc.).
Material and Safety: The core components of the system must be made of corrosion-resistant and non-polluting materials such as stainless steel 316L and PTFE. It must have complete safety designs for explosion-proofing, fire prevention, pressure relief, etc.
Energy and operating costs: Assess the consumption of steam, electricity, and cooling water, and select designs with high energy efficiency.
Floor space and integration: The modular and compact design is more suitable for installation in or near cleanrooms.
III. Industry Application Solution Examples
Lens Cleaning IPA Recovery: Waste IPA Liquid → Filtration → Vacuum Distillation → Molecular Sieve Deep Dehydration → 0.1μm Filtration → Obtain Optical Grade IPA.
Coating process mixed solvent recovery: Waste solvents (possibly containing multiple esters and ketones) → Pretreatment separation → Multi-column series precision distillation → Recovery of each high-purity component respectively.
Waste gas condensation pretreatment + distillation: Exhaust gas from the cleaning machine → Low-temperature condensation to recover most of the solvents → Condensate enters the distillation system for purification.
