>99% HCl recovery
Most feed HCl is released as product gas.
HCl Gas Generation — Sulfuric Acid Route
Anhydrous HCl gas generation by sulfuric-acid stripping, recovering more than 99% of HCl from 30% hydrochloric acid at capacities up to 75 kg/h.
UD Technologies · Vadodara, India
Sulfuric-acid stripping
Strip and dry HCl with concentrated sulfuric acid.
Metered 98% sulfuric acid and 30% hydrochloric acid enter a controlled mixing zone. Sulfuric acid releases hydrogen chloride from solution; heat from dilution, supplemented by a small steam input, supports the evaporation step.
The HCl gas then passes through a sulfuric-acid drying zone and trap before delivery. Hot dilute sulfuric-acid bottoms are cooled for storage, with the system arranged to minimise dissolved HCl remaining in the spent acid.
Up to 75 kg/h
Larger requirements can be reviewed separately.
Few utilities
Cooling water and a small amount of steam.
Simple operation
Controlled mixing, drying and spent-acid cooling.
Salient features
High gas recovery with integrated sulfuric-acid drying.
Materials, utilities, controls and equipment arrangement are selected around the feed and required product.
Controlled feed mixing
Measured acid flows stabilise gas generation.
Dilution heat recovery
Exothermic sulfuric-acid dilution supplies much of the evaporation heat.
Gas enrichment and drying
Sulfuric-acid contact removes residual moisture.
Final acid trap
A polishing stage supports dry-gas delivery.
Cooled spent acid
Bottoms are cooled before transfer to storage.
Low HCl loss
Thermal design limits HCl retained in the sulfuric-acid bottoms.
Process configuration
Review the sulfuric-acid route process.
Final capacity, materials and instrumentation are confirmed against the process data and site utilities.
Sulfuric-acid route system
Mixing, evaporation, drying and spent-acid cooling
Process data
- Feeds
- 98% sulfuric acid and 30% hydrochloric acid
- Gas recovery
- More than 99% of feed HCl
- Capacity
- Available up to 75 kg/h
- Utilities
- Cooling water and a small steam supply
- Bottom product
- Cooled dilute sulfuric acid
Related system
Compare direct boiling of hydrochloric acid.
The boiling route avoids sulfuric acid as a feed and produces reusable 20% hydrochloric acid bottoms.
Discuss your requirements