Читать книгу Encyclopedia of Renewable Energy - James Speight G., James G. Speight - Страница 238

Black liquor is the solution of lignin-residue and the pulping chemicals from the Kraft process which is used to extract lignin during the manufacture of paper. The black liquor is an aqueous solution of lignin residues, hemicellulose, and the inorganic chemicals used in the process and contains more than half of the energy content of the wood fed into the digester. Black liquor (Table B-19) is typically concentrated to 65 to 80% by multi-effect evaporators and burned in a recovery boiler to produce energy and recover the cooking chemicals.

The gasification of black liquor has the potential to achieve higher overall energy efficiency while generating an energy-rich synthesis gas. The synthesis gas can be burned in a gas turbine combined cycle system or converted through Fischer-Tropsch chemistry into chemicals or fuels such as methanol, dimethyl ether (DME), gasoline, or diesel.

See also: Dimethyl Ether, Fischer-Tropsch, Methanol.