Project meeting of STEP at the site of the company ATS - Agro Trading & Solutions in Hardegsen (Photo: DBFZ)

Biogas Biomethane strategy

Project ID 03KB104

BGA-IL - Biogas upgrading with ionic liquids

Synthesis of ionic liquids (Photo: IoLiTec GmbH)


  • 01.10.2014 – 31.03.2018


DVGW test laboratory at the Engler-Bunte-Institute of the Karlsruhe Institute of Technology (KIT)
Engler-Bunte-Ring 1
76131 Karlsruhe

Dr. Frank Graf – project manager
Telephone: +49 (0)721 96402-20


03KB104B - IoLiTec – Ionic Liquids Technologies GmbH
03KB104C - Powerfarm Holding GmbH
  • Address:
  • Powerfarm Holding GmbH
    Haldenstraße 9
    78166 Donaueschingen
  • Contact:
  • Dr. Rainer Gottschalk – project leader
    Telephone: +49 (0)771 83790-10

Associated partners

Cooperation partners



The report is only available in German.


BGA-IL deals with the development of an upgrading process for raw biogas, applying task specific ionic liquids for intensification of the biogas purification process. The consortium consists of the DVGW research center at EBI, IoLiTec GmbH, an expert for ionic liquids and Powerfarm Holding GmbH, a specialist for construction and operation of biogas plants. The work scope of the project contains experimental work in lab as well as a field test at an upgrading plant of a participating project partner for demonstration purpose. The experimental results will allow for a direct comparison of the ionic liquids-based process with state-of-the-art upgrading technology. Thus, the potentials of the new upgrading process can be evaluated under realistic conditions.


The project focusses on increasing energy efficiency and reducing operating costs of biogas upgrading in comparison to state-of-the-art technologies. These targets shall be reached by developing and introducing task specific ionic liquids for biogas upgrading, simplifying process technology and adapting operating parameters of the purification process in order to gain benefits out of the special physical and chemical properties of the applied liquids.


Appropriate ionic liquids for application in the biogas upgrading process will be developed and characterized in close cooperation between the project partners. Relevant physical and chemical data will then be determined experimentally and implemented into the process modelling tool, which provides a basis for optimization of mechanical configuration as well as operating parameters. The most promising liquids will then be applied into the existing lab scale upgrading plant and tested with model gas mixtures as well as in field and finally assessed regarding realization of energetic and economic improvements in the biogas upgrading process.


  • Process development 
  • Biogas upgrading
  • Task specific ionic liquids
  • Process modelling
  • Lab and field test
  • Economic evaluation



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