Lanxess inaugurates nitrous oxide reduction plant in Antwerp

Lanxess has taken another major step on the road to climate neutrality: the speciality chemicals company inaugurated a nitrous oxide reduction plant at its site in Antwerp on February 10, Belgium.

The plant breaks down around 500t/yr of nitrous oxide, which is equivalent to the climate impact of 150,000t of CO₂. Lanxesshas invested around €10M in its construction. A second plant is scheduled to start up in 2023 and is expected to eliminate a further 300,000ts of CO₂ equivalents (CO₂e).

"We are committed to the Paris Agreement to limit global warming to less than two degrees Celsius. The new nitrous oxide reduction plant in Antwerp is a key building block in Lanxess becoming climate-neutral by 2040,” explained Lanxess Board of Management member Hubert Fink. At the same time, he highlighted the economic benefits of the climate protection measures, saying that, "Climate protection is a business case for us. On the one hand, we are becoming an even more sustainable partner for our customers. On the other, we are reducing our costs because we need fewer certificates from the European Emissions Trading System and use less energy thanks to innovative technologies.”

Innovative technology with efficient heat utilization

Nitrous oxide (N₂O), also known as laughing gas, is generated at the Antwerp site during the production of the plastic intermediate caprolactam. It is harmless to humans but 300 times more harmful to the environment than carbon dioxide. At temperatures of around 1000 degrees Celsius, Lanxess breaks down the nitrous oxide into its harmless components nitrogen and oxygen in the new plant, thus neutralising it completely.

In a second process step, the plant breaks down further nitrogen oxides (NO_x). Ammonia is used as a reducing agent for this. At temperatures between 250 and 450 degrees Celsius, the nitrogen oxides are broken down and produce nitrogen and water.

Thanks to the innovative combination of these processes the plant is highly thermally efficient. This is ensured by specially developed ceramic heat exchangers. These capture and store the heat used in the thermal oxidation process and generated during the breakdown of nitrous oxide and nitrogen oxides. When the heat exchangers have stored the heat from the clean gas, the process flow changes direction and the heat exchangers now preheat the incoming exhaust gas. This change of direction then takes place recurrently. This means that significantly less external energy has to be supplied to keep the process running.

Ambitious plans for climate protection

In addition to the Antwerp plant, the Group is currently implementing further climate protection projects with the aim of becoming climate neutral by 2040. Lanxess is also switching the entire energy supply at its Indian sites to renewable energy sources. There, the company is massively expanding its supply of biomass and solar power and will no longer use coal or gas in the future. This will cut CO₂e emissions by a further 150,000t starting from 2024. The Group also plans to phase out coal-based energy use at its major production sites in Germany. In 2019, Lanxess announced to invest a total of up to €100M in its climate protection projects by 2025.

Lanxess is also revising many of its existing production processes. For example, the Group will continue to improve its "Verbund” structures, e.g. when it comes to heat exchange between plants and air purification. Other procedures must first be developed on a large industrial scale. The Group is therefore turning the focus of its research more closely towards climate neutral process and technological innovation.

Since Lanxess was founded in 2004, the Group has more than halved its emissions from 6.4Mt of CO₂e to around 3.06Mt of CO₂e in 2019.

Lanxess in Belgium

Lanxess has two production sites in the Antwerp port area. They are at the heart of the global high-performance plastics business. The intermediates caprolactam and polyamide are produced in Lillo/Antwerp. In Kallo/Antwerp, Lanxess produces glass fibres, also for use in plastics, and rubber chemicals. In total, Lanxess employs around 1000 people in Belgium.