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20.06.2013Siemens and LanzaTech partner to transform steel mill off-gases into bioethanol
Siemens Metals Technologies and LanzaTech have signed a ten-year co-operation agreement to develop and market integrated environmental solutions for the steel industry worldwide. The collaboration will utilize the ground-breaking fermentation technology developed by LanzaTech transforming carbon-rich off-gases generated by the steel industry into low carbon bioethanol and other platform chemicals.

Siemens and LanzaTech will work together on process integration and optimization, and on the marketing and realization of customer projects. Off-gases from the production of iron and steel contain significant amounts of carbon monoxide (CO) and carbon dioxide (CO2). Globally, the iron and steel industry contributes 6.7 percent to the worldwide CO2 emissions. To produce one metric ton of steel, an average of 1.8 metric tons of carbon dioxide (CO2) is emitted. Up to now, these gases have been flared or used to create process heat and electrical energy within the plant.

LanzaTech’s innovative technology, instead, re-uses the off-gases from converter, coking plant or blast furnace processes as nutrients and a source of energy. The patented biological fermentation process allows steel plant operators to make use of the chemical energy contained in off-gases in the form of CO, CO2 and H2 (hydrogen) for the eco-friendly production of bioethanol or other basic chemicals such as acetic acid, acetone, isopropanol, n-butanol or 2,3-butanediol.