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Air & Gas Purification
CO2 TBF VONEN Tank Breather Filters
-  Hydrogen Purification (& Storage) Systems
-  FRESCO2 Air Purifiers
Activated Carbon Filters
CH-TBF VONEN Tank Breather Filters
Activated Carbon Filters
-  Gas & Chemical Agent Filter Design
-  Particle Filtration Indoor-Air
-  Microbes & Biological Agent Filtration
-  NBC (Nuclear, Biological, Chemical)
      Filtration and Tailor-Made Solutions
Hydrogen Taming & Energy Storage
-  Hydrogen Storage & Purification Systems
-  Fuel Cells
Carbon Dioxide CO2 Control

Industrial CO2 Filtration & Recovery

      - CO2 Tank Breather Filters

-  Automatic CO2 Recovery & Storage

ASCO2 Greenhouse CO2 Enrichment
Heat Transmission
-  HTF Condensers
VonEx Heat Exchangers for
   -  No-Frost Evaporators
   -  Heat Recovery and Heating
Specialty Materials
-  Carbon Nanotubes, Catalyzers,
-  Gas Absorbents and Materials Producing
     Chemical Reactions with Gases


Pekka Savonen. All Rights Reserved.

CA-HTF VONEN Activated Carbon Filters

VONEN Engineering has a unique experience and know-how of gas flows in a large number of HTF Ullage
systems at Solar Thermal Power Plants. We are able to offer you
tested and secure Filtration Systems to
eliminate HTF
degradation vapors (mainly Benzene and Phenol) at the HTF Tank Vents of Ullage Systems.

CA-HTF VONEN - Perfect Security
CA-HTF VONEN Filters eliminate 100% of thermal oil degradation vapors Benzene and Phenol, at the gas/vapor outlet of Heat Transfer Fluid (HTF) Tanks.

ATEX Certified Adsorption Measurement and Control

CA-HTF VONEN Activated Carbon Filters can be equipped with a measuring system to guarantee correct timing of the replacement of activated carbon as well as control of efficient use of the adsorbent.


Photo: CA-HTF VONEN P Filter with an activated carbon Saturation Measurement System.

The Measurement System warns the maintenance personnel of the saturation of the adsorbent.

Filtration Efficiency and Capacity tested at independent laboratories;
Benzene Concentration after filter: < 0.01 ppm;

Capacity: >500 kg VOCs before break-through of vapors;
Pressure Drop: < 0.1 bar at 2.000 m3/h;

ATEX Certificied.


ATEX Certified Lead&Lag Filtration System

CA-HTF VONEN L&L Filtration Systems are designed for a continuous filtration during maintenance and for an efficient use of adsorbent. The Lead&Lag system permits the maintenance personnel to change the filtration order of the two filters of the system, or to shut down one of the filter units for maintenance, while the other unit continues in operation.

Leak Test for
ATEX Certified CA-HTF VONEN Lead&Lag Filtration System.
The filter is designed for elevated quantities of


The CA-HTF VONEN Activated Carbon Filters eliminate 100% of thermal oil degradation vapors (mainly Benzene and Phenol) of the Nitrogen gas flow from the gas/vapor outlet of HTF Tanks. Benzene concentrations are below 0.01 ppm at filter outlet.

The CA-HTF VONEN Filters are CE marked.

For more information, call Spain (+34) 626 961 443  or
E-mail us at



CA-HTF VONEN  Activated Carbon

According to tests of an independent laboratory, the CA-HTF VONEN Activated Carbon eliminates 100% of the benzene vapors. The concentration of benzene in the filtered gas-flow is 0 ppm (parts per million) downstream of the Filter.

CA-HTF VONEN activated carbon is delivered in 500 kg Maxi Bags, which allow easy loading into the filter.




PURECAT HTF Condensers


In order to purify and recover the HTF (Dowtherm-A or Therminol VP1) for reuse, and to eliminate the HTF residuals as well as the HTF degradation vapors, we can offer you Air Cooled as well as Shell & Tube condensers to be installed upstream of the activated carbon filters.



More VONEN Vent Filters


CH-TBF VONEN Tank Breather Filters for gaseous, particulate and microbial contaminants.

Tank Breather Filters for Demineralized Water Tanks

CO2 Filters for Air In-Take of Demineralized Water Tanks

More Information


We are just a phone call away:

Vonen Engineering, S.L., C/ Duque de Sesto, 26, E-28009 MADRID, Spain

Phone: (Spain +34) 626 961 443