20–70%
Recover weak sulfuric acid to reusable strength.
Sulfuric Acid Concentration Plants
Sulfuric-acid concentration plants for recovering weak or spent acid from approximately 20% to 70% using single- or multi-stage evaporation.
UD Technologies · Vadodara, India
Spent-acid recovery
Remove water from weak sulfuric acid for reuse.
Chemical processes often dilute or contaminate concentrated sulfuric acid, creating a large spent-acid stream. Concentration from roughly 20 to 70 wt% removes water by evaporation and can return the acid to useful service.
Single- or multi-stage natural-circulation, thermosiphon or forced-circulation evaporators are selected around feed strength and available heating media. Multi-stage plants reuse vapour and boiling-point differences to reduce steam demand, while design also accounts for foaming, gas release and precipitation.
Single or multi-stage
Balance simplicity against steam economy.
Multiple circulation types
Natural, thermosiphon or forced circulation.
Low acid volatility
Sulfuric-acid vapour is minimal up to about 70% concentration.
Salient features
Recover acid while managing steam, fouling and gas release.
Materials, utilities, controls and equipment arrangement are selected around the feed and required product.
Water evaporation
Concentrate dilute acid without consuming additional sulfuric acid.
Vapour reuse
Multi-stage arrangements reduce fresh heating-steam demand.
Circulation selection
Match natural, thermosiphon or forced circulation to feed behaviour.
Foam and gas allowance
Design considers gases released during concentration.
Solids management
Precipitation and contaminant behaviour influence equipment selection.
Reuse-oriented product
Recover up to approximately 70% acid for suitable plant duties.
Process configuration
Select evaporation staging around energy and feed behaviour.
Final capacity, materials and instrumentation are confirmed against the process data and site utilities.
Single-stage concentration
A direct evaporation route for simpler recovery duties
Selection factors
- Feed
- Weak or spent sulfuric acid
- Product
- Up to approximately 70 wt% sulfuric acid
- Circulation
- Natural, thermosiphon or forced circulation
- Best fit
- Simpler duties where steam economy is secondary
Multi-stage concentration
Reuse vapour energy across multiple evaporator stages
Selection factors
- Energy strategy
- Reuse vapour through pressure and boiling-point differences
- Stage count
- Governed by feed strength and available heating media
- Process checks
- Foaming, gas generation and precipitation
- Best fit
- Larger duties where reduced steam use justifies staging
Related system
Prepare acid at a lower controlled strength.
Dilution skids combine accurate proportioning and cooling for ready-to-use sulfuric acid.
Discuss your requirements