Volatile Organic Compounds Vapor Recuperation Systems


Vapor recovery objects, their characteristics and features

Installation supervision works

Starting up works

Maintenance Service

VRU in operation


RNA Technology offers a line of vapor recovery units (VRU) to recover volatile organic compounds from the vapors.

The process is based on well-known adsorption techniques in the layer of activated carbon and regeneration of activated carbon using a vacuum. This technology is well proven as the best solution for such objects as: filling storage tanks, road and rail tankers and marine tankers.

The design of our systems and the selection of spare parts for achievement of a lasting, safe and effective process are based on international standards, recognized in the oil and gas industry, such as ASME VIII, ASME B31.3, EN 60079 & EN 1127.



Typical vapors recuperated and recovered by our systems are as follows:


  • Gasoline
  • Diesel
  • E5
  • E10
  • E85
  • E100
  • Methanol
  • Benzene
  • Toluene
  • Xylene
  • MTBE
  • ETBE
  • Naphtha

Our vapor recuperation systems are designed to meet the stringent requirements in the field of health and safety of European directives.

Emission Standards:


  • 150 mg / Nm3
  • 10 mg / Nm3
  • 35  mg / Nm3

The main characteristics:

  • Modular construction
  • Prefabricated frame makes installation easy
  • Energy efficiency

* At 40% vol. hydrocarbon concentration and emission of 10 g / Nm3
** With the use of a rotary vane vacuum pump
*** With the use of a liquid ring vacuum pump


Description of  vapor recuperation process

The process is based on the separation of gases using activated carbon. The mixture of air and vapors of volatile organic compounds (VOCs) are fed to the charcoal filters, where the VOCs are adsorbed in the carbon layer, and the clean air passes through the hole to the atmosphere. Only special granular durable and safe activated carbon is used in our filter.
After a certain period, usually from 10 to 15 minutes, activated carbon, saturated with hydrocarbons and VOC emission slightly increases. The analyzer located at the top of the filter finds it, then the control system switches the mode of the filter from entering the vapor phase to regeneration mode.

The vacuum system evacuates further recovered VOCs from the filter and then sends to the absorption column where VOCs arecondensed in the flow of gasoline or similar products, which are available on the terminal. While one filter is regenerated, the other filter receives a mixture of air and vapors of volatile organic compounds. Then it switches over.
Alternately using the capacitance adsorption and regeneration modes, the system operates continuously.

The vacuum system then pumps the recovered VOC from the Filter and then sends it to the absorption column where VOC condenses in the gasoline stream or similar products that are available at the terminal. While one filter is regenerated, another filter receives a mixture of air and vapors of volatile organic compounds. Then switching takes place.

Alternately using tanks in the modes of adsorption and regeneration, the system operates continuously.


RNA Technology also offers to the Customers a process of


This is the same Carbon-vacuum adsorption, supplemented by a knot of circulation and compression of the absorbent. Used in the absence of the possibility of feeding fresh absorbent from the tank farm. In connection with the absence of absorbent, one unit is added - a unit for circulation and compression of the absorbent inside the unit.


The advantage of this process is that the flow of absorbent from the tank or pipeline is not required. All recovered vapors are compressed and contained in the unit as an absorbent until the reconstituted product is returned to the appropriate storage capacity. The process uses adsorption with activated carbon to remove hydrocarbons in the vapor stream, thus allowing clean air to escape from the carbon filters. After that, the adsorbed hydrocarbons are extracted from the activated carbon layer by the vacuum system. Further, the vapors are compressed and condensed into the circulating absorbent stream inside the VRU.


Schematic diagram of the work of VRU