Low effluent
Calcium-chloride solution is reconcentrated and reused.
Anhydrous HCl Gas Generation — Calcium Chloride Route
Anhydrous HCl gas generation by the calcium-chloride route with reagent recycle, low effluent generation and a 30% turndown ratio.
UD Technologies · Vadodara, India
Dry HCl generation
Release hydrogen chloride while recycling the calcium-chloride solution.
Adding concentrated calcium chloride solution changes the hydrochloric-acid/water vapour equilibrium, allowing hydrogen chloride to be liberated beyond the normal azeotropic limit. Metered hydrochloric acid and calcium chloride enter a stripping column above a steam-heated reboiler.
The bottom calcium-chloride solution is reconcentrated and returned to the process. Overhead vapour is condensed in stages with cooling water and chilled brine; the comparatively dry HCl gas then passes through a mist eliminator to the consuming process. The route is used for hydrochlorination and preparation of IPA–HCl or methanol–HCl where moisture must be controlled.
30% turndown
Operate below nameplate capacity when demand changes.
Dry gas
Staged condensation and mist elimination remove moisture.
API applications
Supports hydrochlorination and solvent-HCl preparation.
Salient features
A recycle-based route designed for practical operation.
Materials, utilities, controls and equipment arrangement are selected around the feed and required product.
Azeotrope suppression
Calcium chloride makes additional HCl available for stripping.
Reagent recovery
Dilute calcium-chloride bottoms are evaporated and reused.
Staged cooling
Cooling water and chilled brine progressively condense water vapour.
Mist elimination
Final entrainment removal protects the consuming process.
Simple operation
The route is designed with fewer pumps and instruments.
Mixed construction
Materials are selected for each corrosive and thermal duty.
Process configuration
Understand the calcium-chloride recycle process.
Final capacity, materials and instrumentation are confirmed against the process data and site utilities.
Calcium-chloride route system
Stripping, staged condensation and reagent recovery
Process sequence
- Feeds
- Commercial hydrochloric acid and concentrated CaCl₂ solution
- Generation
- Metered stripping column with steam-heated reboiler
- Gas conditioning
- Cooling-water and chilled-brine condensation stages
- Final gas step
- Mist eliminator before point of use
- Bottoms handling
- CaCl₂ solution reconcentrated and recycled
- Turndown
- Approximately 30%
Related system
Compare the boiling-route alternative.
Where 20% hydrochloric acid can be reused on site, boiling-route generation may offer a different cost balance.
Discuss your requirements