Recycling and recovery
Isopropyl alcohol recycling
A high volume cleanroom and electronics stream with an azeotrope worth understanding.
Isopropyl alcohol recovers by distillation but forms an azeotrope with water at around 87.7 percent IPA, which caps simple distillation at that purity. Higher purity needs azeotropic or extractive distillation or molecular sieve drying.
Source: 40 CFR 261.21 for D001Where spent IPA comes from
- Semiconductor and electronics cleaning
- Cleanroom surface and equipment wipedown
- Pharmaceutical and biotech processing
- Medical device manufacturing and sterilization support
- Optics and precision component cleaning
The azeotrope decides the economics
Simple distillation cannot take IPA past roughly 87.7 percent, because at that composition the vapour and liquid have the same makeup. For a cleaning application that is often perfectly adequate. For a semiconductor process that specifies 99.9 percent it is not.
Where high purity is needed the extra step costs real money, and the honest comparison is against buying virgin. Where 87 percent will do the job, recovery is straightforward and the saving is substantial. The right question is what purity the process actually needs, which is frequently lower than the specification implies.
Common questions
Is spent IPA a listed waste?
Isopropyl alcohol is not on the F list. Spent IPA is usually hazardous by characteristic, D001 ignitable, since the flash point is around 12 C. Contaminants picked up in use can add codes.
Can recovered IPA go back into a cleanroom?
Only if it meets the specification, which usually means going past the azeotrope. Many operations use recovered IPA for non critical cleaning and virgin for cleanroom work, which captures most of the saving.
What about IPA water mixtures?
Dilute aqueous IPA is common from rinsing and often below the ignitability threshold. Whether it is hazardous at all depends on concentration, so it is worth testing rather than assuming.
Related services
Not sure how this applies to your site?
Send a profile, an old manifest, or photographs of the drums. A technical professional will tell you where you stand.
This page summarizes federal requirements and is not legal advice. State programs can be more stringent than the federal baseline. Verify against current federal and state regulations before acting. Last reviewed September 2026.