10–900 kg/h
Falling-film systems across a broad incoming HCl range.
Hydrogen Chloride Gas Absorbers
Adiabatic, isothermal and falling-film HCl gas absorbers for emission control and hydrochloric-acid recovery from 10 to 900 kg/h gas feed.
UD Technologies · Vadodara, India
HCl emission control and recovery
Turn a corrosive waste gas into recoverable hydrochloric acid.
Hydrogen chloride is highly soluble in water, but absorption releases substantial heat. The achievable acid concentration therefore depends on gas partial pressure, temperature and how effectively heat is removed. Mixed gases containing chlorine, sulfur dioxide, inerts or organic vapours can require additional separation and scrubbing stages.
Borosilicate glass is well suited to HCl gas and hydrochloric acid service, excluding glass-attacking contaminants such as hydrofluoric acid. UD Technologies selects batch, adiabatic packed-column or isothermal falling-film arrangements around feed composition and product-acid target.
Up to 30% HCl
Achievable in suitable absorber conditions.
High absorption efficiency
Cooled film and secondary scrubbing recover residual gas.
Mixed-gas engineering
Design accounts for chlorine, SO₂, inerts and organics.
Salient features
Control absorption heat and residual gas together.
Materials, utilities, controls and equipment arrangement are selected around the feed and required product.
Corrosion-resistant glass
Borosilicate construction suits HCl gas and acid service.
Absorption-heat removal
Cooling stabilises temperature and increases acid concentration.
Wide gas-loading range
Film wetting and circulation accommodate changing flow.
Secondary scrubbing
Recover residual HCl from gases leaving the primary absorber.
Acid recovery
Produce a reusable hydrochloric-acid stream instead of only neutralising gas.
Impurity-aware design
Organic vapours and co-contaminants influence process selection.
Process configuration
Choose adiabatic packed-column or isothermal film absorption.
Final capacity, materials and instrumentation are confirmed against the process data and site utilities.
Adiabatic HCl absorber
Continuously operated packed-column absorption
Gas enters the column base while water descends through glass or ceramic packing.
Configuration
- Absorber
- Vertically mounted packed glass column
- Heat handling
- Top condenser/cooler returns condensed water
- Acid withdrawal
- Bottom product cooled before discharge
- Typical product
- Up to approximately 30% HCl under suitable conditions
- Useful duty
- Gas streams containing recoverable organic impurities
Falling-film HCl absorber
Isothermal absorption with point-of-source cooling
Configuration
- Incoming gas
- 10–900 kg/h HCl
- Absorber
- Vertical shell-and-tube unit with film distributor
- Cooling
- Shell-side cooling water
- Polishing
- Secondary and tail scrubber for remaining gas
- Strengths
- High efficiency, acid concentration and operating stability
Related system
Generate HCl gas for the consuming process.
Compare dry-gas generation routes where hydrogen chloride is required as a reactant rather than removed as a vent gas.
Discuss your requirements