Waste pulping liquors, organic residue, lignin compounds, regenerated pulping chemicals, pulping chemicals recovery, biomass conversion, metal-organic substances, residue treatment reactor, metal oxide precursor
Pulp and paper chemistry and recovery, biomass conversion
Conversion efficiency of organic residues to fuels or chemical feedstocks while concurrently recovering inorganic pulping chemicals
This invention is a new process chemistry to convert the organic residues of lignocellulosic pulping, including lignin, to value-added products (i.e. acetylene, other hydrocarbons, CO and H2) and to simultaneously recycle pulping chemicals including NaOH, Na2S, Mg(HSO3)2, Ca(HSO3)2 and Na2SO3. The elevated temperatures are supplied by direct heating with thermal plasma, or by combustion of suitable fuels in air or O2-enriched air, with or without oxidant pre-heat. Organic, inorganic, and metal-organic substances within the pulping residue react with each other to form metal carbides, CO, H2, H2S, and/or SO2.
UUS Patent Number 7,494,637; issued February 24, 2009
Last revised: November 5, 2010
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