A method for producing a low ash content biofuel mixture comprising tall oil pitch and lignin and use of the biofuel mixture in a petroleum refinery

The present invention concern a low ash content biofuel mixture comprising tall oil pitch and lignin and optional additives characterized by, providing a stream TOP and providing a stream of lignin purified having an ash content below about 0.1 % preferably below about 0,01 % followed by mixing low ash lignin and TOP in a reactor and discharging a pumpable and substantially homogeneous low ash biofuel mixture comprising TOP and lignin from the reactor and using the biofuel mixture as a renewable feedstock in petroleum refineries, as a biofuel for power and/or heat generation, as a fuel for limekilns or kilns for iron ore processing or as a feedstock for fine chemicals or carbon fiber manufacturing.