4746 NO 35 12017 TECHNOLOGIES ech Talkfor Lignin Recovery and sulfuric The most quanti31 able bene31 ts to a kraft mill for installing a Lignin Recovery system are the ability to debottlene ID: 831901
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4746NO. 35 / 1-2017NEW TECHNOLOGIES T
4746NO. 35 / 1-2017NEW TECHNOLOGIES TECHNOLOGIES ech Talkfor Lignin Recovery and sulfuric The most quanti able bene ts to a kraft mill for installing a Lignin Recovery system are the ability to debottleneck a recovery boiler to in-crease pulp production and to have a sustain-able biofuel to replace fossil fuels in the lime kiln. The enhanced revenue from increasing pulp production and the cost savings from substituting purchased fossil fuels, in addi-tion to the environmental impact of reducing greenhouse gas emissions, can be readily cal-Today, with the increased knowledge and em-Figure 4. The Wet gas Sulfuric Acid (WSA) process enables in-mill production of concentrated commercial-grade H CONTACTLauri Pehu-Lehtonenlauri.pehu-lehtonen@andritz.coming, the dry solids content of lignin is typically 60-62% before the drying stage, and 95% after. In its most complete form, the Lignin Recovery process consists of these sub-processes:1) PRECIPITATION. The pH of black liquor from the evaporation plant is decreased with ) in the acidi cation reac-tor to precipitate the lignin from the black li-quor. The resulting slurry is fed to a Membrane Filter Press that ef ciently separates the pre-cipitated lignin and lignin-lean black liquor.2) ACID WASH. Impurities (mostly sodium) are leached from the compressed precipitat-ed lignin in a dilution wash with sulfuric acid. Displacement washing is used to remove the sodium sulfate formed during the acid