Hydrochloric acid recovery

Hydrochloric acid recovery

Hydrochloric acid recovery and anhydrous hydrochloric acid generation units enable the abortion of any HCl gaseous stream and then its later desorption to produce highly concentrated HCl. If required the water content of the produced acid can be reduced to only a few ppm. A HCl acid recovery and anhydrous HCl generation unit includes at least an absorber, a fractioning graphite column, a graphite reboiler and one graphite condenser. Depending on the expected water content additional graphite condensers might be added.


3D Renderings


  • Impervious graphite: GAB GPX1, GPX1T or GPX2
  • Pressure plates and flanges: carbon steel or stainless steel
  • Tie rods, nuts, bolts, washers, springs: stainless steel
  • PTFE lined steel, glass lined steel or FRP piping


  • Modular design: the different pieces of equipment (absorber, columns, reboiler, primary, secondary and tertiary condensers) of the system can be adapted (height, diameter, heat transfer surfaces, columns internals) to the process requirements
  • Graphite nozzles on product and utility sides
  • Thermal expansion compensation ensured by tie rods and helical springs
  • Carbon-fiber reinforcement (optional)

Key Features:

  • Recovery of hydrochloric acid
  • Generation of up to 2000 kg/h of gaseous pure dry HCl
  • Design pressure: -1 barg (full vacuum) to +10 barg (145 psig)
  • Design temperature: -60 to +200°C (-76 to 392°F)
  • Design:  according to European PED, ASME code, Chinese Pressure Vessel code or any other national pressure vessel code

Key Benefits:

  • Recovery and beneficiation of hydrochloric acid
  • Generation of dry HCl
  • Outstanding corrosion resistance
  • Superior heat transfer and mass transfer performances
  • Superior process equipment (absorber, fractioning column, reboiler and condensers) efficiency
  • Reboiler and condenser integrated in the graphite column
  • High operational safety
  • Sturdy and modular design
  • Short lead time
  • Long lifetime

Optional features:

  • Detail engineering with control and regulation
  • On-site erection and start-up
  • Carbon fiber reinforcement

Main applications:

  • Hydrochloric acid recovery
  • Generation of highly concentrated HCl
  • Generation of dry HCl

Hydrochloric acid recovery and generation of dry hydrochloric acid

A hydrochloric acid recovery and dry hydrochloric acid generation unit includes at least an absorber, a fractioning column, a reboiler and one head condenser. Depending on the expected water content additional vent condensers might be added.

First of all, a falling film absorber ensures the absorption of the HCl gas by diluted hydrochloric acid or water. An intimate contact is created between the gas to be absorbed and the absorption liquid that flow co-currently downward with extraction of the enthalpy heat by circulation of coolant on the service side. Isothermal absorbers are vertically mounted. They include a liquid distribution plate in their upper section as well as an abortion section with simultaneous cooling. Simultaneous cooling increases absorption efficiency and enables the production of stronger acid.

The absorbed acid enters a fractioning column. A reboiler at the bottom of the column evaporates the liquid diluted hydrochloric acid while a condenser at the top of the column condenses the concentrated gaseous HCl vapors.

A series of condensers, first cooled by water, then chilled water and then brine enable the progressive reduction of the water content in the concentrated HCl vapors. 

GAB Neumann’s hydrochloric acid recovery and dry hydrochloric acid generation units

GAB Neumann’s graphite hydrochloric acid recovery and dry hydrochloric acid generation units include an annular groove graphite falling film absorber, a fractioning graphite column with a packing section, a graphite bottom reboiler, and one graphite head condenser. Depending of the expected water content in the HCl an additional graphite vent condenser cooled by chilled water and another graphite vent condenser cooled by brine might be added.

GAB Neumann’s graphite isothermal absorbers are designed to distribute the absorption liquid into the absorption, to ensure the proper absorption of the gas by the liquid and to efficiently cool down the progressively formed acidic liquid (removal of the absorption enthalpy).

Safety, reliability, availability, and performance on the long-term are our primary considerations when we size, design, manufacture and assemble our HCl recovery and dry HCl generation units.

Our extended and highly customizable graphite equipment portfolio enables us to provide customized solutions to the recovery of HCl and the generation of dry HCl. Our systems can be adapted to best meet the flowrates, velocities, pressure drops, and specific process requirements such as the removal of impurities if ever necessary.

All our graphite pieces of process equipment are machined after phenolic resin impregnation thus guarantying a heat transfer surface totally free of resin and ensuring therefore the highest possible heat transfer rate.

Industrial processes:

  • Crop protection
  • Fumed silica
  • Silicones
  • Titanium dioxide
  • Fine chemicals
  • Active pharmaceutical ingredients
  • Epichlorohydrin
  • Vinyl chloride monomer
  • Flavors and fragrances
  • Vitamins
  • Isocyanates
  • Polycarbonate
  • Coagulants
  • Treatment, purification and concentration of spent acids
  • and many more…

GAB Neumann GmbH

Alemannenstrasse 29

79689 Maulburg


Tel: +49 (7622) 6751 0

Fax: +49 (7622) 6751 20


GAB Neumann GmbH | Alemannenstrasse 29 | D-79689 Maulburg | Phone +49 (7622) 6751 0 | Fax +49 (7622) 6751 20 | E-Mail info@gab-neumann.de | www.gab-neumann.com

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