Lehrstuhl für Technische Thermodynamik Logo Energy Systems Engineering

CO2RRECT - CO2-Reaction using Regenerative Energies and Catalytic Technologies

Work package: Overall process analysis

Goal of the project


Within the framework of the CO2RRECT project the use of carbon dioxide as a feedstock for chemical industry in conjunction with mainly renewable energy shall be investigated. The goal is bind the carbon dioxide, which has been captured in power plants, sustainably in plastics. As methane currently is used as the primary feedstock for plastic production, the alternative route presented by use of carbon dioxide would lower the need for fossil primary energy sources.


 Quelle: Bayer Technology Services


For the production of isocyanates (such as MDI), used as a educt for the polyaddition reaction that produces polyurethane, amoung others hydrogen and carbon monoxide are needed. Thus in the CO2RRECT project the three following pathways will be investigated which could yield the needed hydrogen, H2, and carbon monoxide, CO:



  • Reverse Water-Gas-Shift        CO2 + H2 --> CO + H2O
  • Dry Reforming                         CO2 + CH4 --> 2CO + 2H2
  • CO2 Hydrierung                      CO2 + H2 --> HCOOH


As the reaction equations show, carbon dioxide is added as a educt in all of the reaction pathways. The chemical activation of the very stable carbon dioxide is achieved mainly by addition of hydrogen, which is provided by an electrolysis. Part of the produced H2 is also needed directly for the production of isocyanates. As an electrolysis is used to generate the hydrogen, it is possible to produce hydrogen from primarily renewable energy sources. Since these energy sources mainly consists of fluctuating energy carriers (e.g. wind energy), it is necessary to be able to operate the electrolysis on partially load. However the chemical processes are optimized for a constant energy supply, leading to the conclusion that energy has to be stored in form of hydrogen. Thus another important goal of the CO2RRECT project is to identify a suitable hydrogen storage.



Process flowshett of the CO2RRECT process with rWGS

Tasks of the LTT


The task of the LTT is the comparison of different process variations with regard to their eco-efficiency. For the rigorous comparison performed it is necessary to evaluate entire process chains of differing carbon dioxide conversion pathways. The methodical focus lies withing the correct consideration of the dynamical system behavior when determining the relevant mass and energy streams. For this work a semi stationary process model will be developed with the help of the TOP-energy software. This enables quick and easy calculation of initial values for different process needs. Another focus of the work is on the development of a method which can be used to compare the chemical use of carbon dioxide with other options, such as storage etc. Lastly the question shall be answered whether, the processes of the chemical industry are suitable as a storage for the irregularly generated energy of renewable processes.


Project partners


  • Bayer Technology Services GmbH
  • Bayer MaterialScience AG
  • RWE Power AG
  • Siemens AG
  • Invite GmbH
  • CAT Catalytic Center
  • Institut für Technische und Makromolekulare Chemie
  • Lehrstuhl für Technische Thermodynamik
  • Institute for Power Generation and Storage Systems
  • MPI für Dynamik komplexer technischer Systeme
  • Fritz-Haber Institut
  • Leibniz-Institut für Katalyse e.V. an der Universität Rostock
  • Ruhr-Universität Bochum
  • Technische Universität Dortmund
  • Technische Universität Dresden
  • Universität Stuttgart
  • Karlsruhe Institute of Technology
  • Technische Universität Darmstadt




This project is funded by the German Federal Ministry of Education and Research.

Dipl.-Ing. André Sternberg
project duration