Greenhouse Gases Avoided by Using Evonik Products
Evonik markets a variety of products whose use makes a positive contribution to reducing greenhouse gas emissions compared to conventional alternatives. The avoidance of greenhouse gases shown here results from applications for the following four products: “green” tire technology, amino acids for animal nutrition, foam stabilizers for insulating materials, and oil additives for hydraulic fluids.
The amounts stated are avoided over the usage life cycle of the products, based on volume sales of the products manufactured by Evonik in the year given. The method used to compile the data is the WBCSD Avoided Emissions Guidance published in October 2013.
This section presents certain selected “beacon products” which, compared to their established alternatives, save the greenhouse gas emissions shown in the table.
GREENHOUSE GAS EMISSION REDUCTIONS FROM OPTIMIZED INSULATION MATERIALS
How does the technology reduce greenhouse Gas Emissions?
Evonik develops additives, and particularly foam stabilizers (TEGOSTAB®), which are essential for producing and optimizing foam properties. These polyurethane (PU)-based foams are used, for example, in building insulation or for insulating electrical appliances such as refrigerators. The improvement of insulation properties reduces energy consumption and therefore makes a contribution to reducing greenhouse gas emissions.
The stabilizers used for the production of polyurethane foam consist of polyether-modified polysiloxanes. In these surface-active substances, the siloxane chain represents the hydrophobic part of the molecule that bonds to the surface of the foam cells, lowers the surface tension, and thereby stabilizes the foam. The polyether groups as the hydrophilic part of the molecule are responsible for compatibilization with the PU matrix, which makes the surface activity possible. To achieve maximum foam stabilization and the resulting particularly fine foam structure, the molecule structure has to be adapted to an individual foam formulation. Custom-tailored foam stabilizers therefore create particularly good insulating properties in the finished foam product. In addition to the microfine foam structure, customized foam stabilizers also serve to optimize the processing properties of a foam system. This minimizes irregularities in the foam such as cavities (undesirable hollow spaces in the foam) and achieves a more homogeneous density distribution, which contributes to a further improvement of insulating properties as well.
Development of greenhouse gas savings over the life cycle of applications of the products by Evonik that were sold in the specified year
CO2eq savings [Millions of metric tons]