Generation of syngas and sodium hydroxide by self-steam gasification of black liquor and catalyzed with calcium oxide derived from white mud

In order to achieve the resource utilization of black liquor and white mud. The new method which the self-steam gasification of black liquor and catalyzed with calcium oxide process is proposed for effectively treating the black liquor and obtaining the syngas and alkali. As results, 1.0 kg of SS can generate 0.714 kg-0.892 kg of syngas with its lower heating value ranging from 15.62 MJ/Nm³ to 10.10 MJ/Nm³. The solid products produce the regenerated alkaline solution with the causticizing efficiencies in the range of 50.48% to 80.45% after dissolved in water. Meanwhile, this new method can simplify the traditional pulping process. Therefore, it not only enables the resource utilization of the by-products from the pulping production process, but also reduces the energy consumption of alkali recovery and CO₂ emissions.