Replacing Trichloroethylene (TCE)
Replacing TCE is the work Roovel Solutions has been doing in Indian plants since 2000. It is rarely a chemical swap: the aqueous route changes the process, and choosing between the two routes is really a question of whether the line can be rebuilt.
The short answer
There are two honest routes off trichloroethylene. Convert to an aqueous line — wash, rinse, dry at 55–65 °C instead of the 90–100 °C a vapour zone needs — which is cheaper to run and far simpler to comply with. Or drop in a high-flash non-chlorinated solvent where the existing equipment must be kept.
- TCE vapour zone
- 90–100 °C
- Aqueous wash
- 55–65 °C
- Aqueous concentration
- 1–5%
- Drop-in solvent
- PC-S 342, n-propyl bromide
- Rust protection after wash
- 7–15 days indoors
Solvent replacement in practice
TCE earned its place because it dissolves mineral oil on contact and evaporates without residue, so parts leave dry and need no rinse. The costs caught up with it: it is classified as carcinogenic to humans, the vapour zone must be held near boiling, and exposure monitoring, effluent handling and disposal all carry real cost and real liability. A single regulatory action can stop a line.
The aqueous route is the better destination where it is affordable. You gain a rinse and a drying stage, and you lose the 90–100 °C energy load, the exposure controls and the hazardous solvent waste stream. The chemistry runs at 1–5% and 55–65 °C, and carries an inhibitor giving 7–15 days of indoor rust protection so parts survive the gap between wash and assembly.
The drop-in route exists for plants that cannot rebuild the line yet. A high-flash, non-chlorinated solvent runs in the same equipment and removes the carcinogen and the chlorinated waste stream without a capital project. It is a real improvement rather than a final destination.
The Failure Modes
These are the problems we are called in for most often on this method — and what causes each one.
Treating it as a chemical swap
An aqueous conversion adds rinse and dry stages. Bath sizing, cycle time, drainage and drying capacity all have to be planned, or the line runs slower than the one it replaced.
Forgetting the flash-rust window
TCE left parts dry and oily-clean. Aqueous leaves them wet and chemically bare, and steel flash-rusts within minutes. Inhibition in the cleaner or the final rinse is not optional.
No agreed effluent route
The spent bath carries the oil taken off your parts. Settle where it goes and what it costs before the trial, not after — this is what usually delays a changeover.
Skipping the trial
Cleaning performance depends on your soil, your metal and your equipment. Agree pass/fail criteria up front and prove them on your own line.
Running It Properly
- 1Audit the current processRecord soils, substrates, cycle time, throughput and the cleanliness standard the line has to meet today.
- 2Choose the routeAqueous where the line can take a rinse and dry stage; a high-flash non-chlorinated solvent where the existing equipment must be kept.
- 3Match chemistry in the labSend a sample part. The formulation is matched to your actual soil and metal before anything ships in volume.
- 4Agree the effluent routeConfirm where the spent bath goes and what it costs, and whether the receiving party needs the safety data sheet.
- 5Run a supervised trialAgree pass/fail criteria up front, run on your own equipment, and only move forward if the numbers clear the bar.
Solvent replacement — FAQ
Prove It on Your Own Line
Send a sample part with your soil and equipment details. The lab matches a formulation and returns a dosing and trial plan before anything ships in volume.
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