Coal made from grass

Coal made from grass in just 3 hours.

Source: Der Spiegel

In order to convert biomass into charcoal, nature needs millions of years. However, scientists from the Karlsruhe Institute of Technology (KIT) have developed a new technique that in three hours converts plant remains into a new type of coal called BioChar. This BioChar has the same properties as brown coal, plus the advantage that it is CO2 neutral.

First, the water from the plants is removed by heating at 200 degrees under a pressure of 20 bar, which is 20 times higher than atmospheric pressure at sea level. As a result remains a black slurry with almost all the carbon of the prime material. Next, it comes to further dewatering in a press and is then dried even with heat.

The pilot plant located in Ludwigsfelder can convert 200 Kg of grass and green waste into about 70 Kg of BioChar.

Complete article (In german)

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