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Energies 2016, 9(1), 13; doi:10.3390/en9010013

Generation of Hydrogen, Lignin and Sodium Hydroxide from Pulping Black Liquor by Electrolysis

Institute of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
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Academic Editor: Animesh Dutta
Received: 26 September 2015 / Revised: 6 November 2015 / Accepted: 14 December 2015 / Published: 25 December 2015
(This article belongs to the Special Issue Organic Waste/Resources to Energy and Value added Product)
View Full-Text   |   Download PDF [1887 KB, uploaded 25 December 2015]   |  

Abstract

Black liquor is generated in Kraft pulping of wood or non-wood raw material in pulp mills, and regarded as a renewable resource. The objective of this paper was to develop an effective means to remove the water pollutants by recovery of both lignin and sodium hydroxide from black liquor, based on electrolysis. The treatment of a 1000 mL of black liquor (122 g/L solid contents) consumed 345.6 kJ of electric energy, and led to the generation of 30.7 g of sodium hydroxide, 0.82 g of hydrogen gas and 52.1 g of biomass solids. Therefore, the recovery ratios of elemental sodium and biomass solids are 80.4% and 76%, respectively. Treating black liquor by electrolysis is an environmentally friendly technology that can, in particular, be an alternative process in addressing the environmental issues of pulping waste liquor to the small-scale mills without black liquor recovery. View Full-Text
Keywords: black liquor; electrolysis; energy; lignin; hydrogen black liquor; electrolysis; energy; lignin; hydrogen
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Nong, G.; Zhou, Z.; Wang, S. Generation of Hydrogen, Lignin and Sodium Hydroxide from Pulping Black Liquor by Electrolysis. Energies 2016, 9, 13.

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