A process for the pyrolysis of carbonaceous material is carried out in a
cyclone reactor which is fitted with enhanced filtering equipment. In
addition the invention relates to the use of a cyclone fitted with a
rotating filter as a pyrolysis reactor. By using a cyclone of the
rotating separator type as a pyrolysis reactor, carbonaceous material,
such as biomass, can effectively be converted in a product having
excellent chemical properties and which product is free from particulate
matter.