What is black liquor?
Black liquor is a liquid by-product of chemical pulping. It is routinely burned in recovery boilers, both to recover pulping chemicals for further use and to generate renewable heat and power. It is known as black liquor in the kraft pulping process, and red or brown liquor in the sulfite pulping processes. For the purposes of the program, black liquor includes all liquid by-products of a chemical pulping process that have a positive caloric value and are burned in a recovery boiler for the purpose of energy production.
