Transcription of 2-1 Recausticizing - Principles & Practice
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2-1 Recausticizing - Principles & Practice
1 TAPPI KRAFT RECOVERYSHORT COURSERECAUSTICIZINGCHAPTER - Principles AND PRACTICEBYDALE SANCHEZVECTOR PROCESS EQUIPMENT BASIC CHEMISTRY FLOWSHEET OPTIONS GREEN LIQUOR PREPARATION WHITE LIQUOR PREPARATION LIME MUD WASHING CONTROLS2 LIME KILNLIME MUDWASHINGWEAK WASHLIMEMUDWATERWHITELIQUORCLARIFICATION LIME MUDWHITE LIQUORSMELTDISSOLVINGSMELTFROMRECOVERYBO ILERGREENLIQUORCLARIFICATIONDREGSSLAKER/ CAUSTICIZERSLIMEGREENLIQUORGRITRECAUSTIC IZING CYCLEBASIC CHEMISTRYGREENLIQUOR+LIMEWHITELIQUORLIME MUD=+Na2CO3+ H2O + CaO = 2 NaOH + CaCO33 CHEMICAL REACTIONS SLAKINGCaO + H2O Ca(OH)2+ Heat CAUSTICIZINGCa(OH)2 + Na2CO3 2 NaOH + CaCO3 OVERALL REACTIONNa2CO3 + H2O + CaO 2 NaOH + CaCO3 EQUILIBRIUM REACTION REVERSIBLE INCOMPLETE4 REACTION AT SOLID/ LIQUID INTERFACEUNREACTEDCORENa+CO3=OH-CaOCaCO3 DEFINITIONSTTA = TOTAL TITRATABLE ALKALINaOH + Na2S + Na2CO3AA = ACTIVE ALKALINaOH + Na2S EA = EFFECTIVE ALKALINaOH + Na2S SULFIDITY %Na2S / AA or Na2S / TTA5 DEFINITIONSCE = CAUSTICITY %NaOH x 100 NaOH + Na2CO3 Lime Availability %CaO / Kiln ProductNote: All chemical concentrations are expressed on a Na2O basis TTA = 120 g/l as Na2 OOther units of measure are lb/ft3& lb/galOPERATING CAUSTICIZING EFFICIENCY7580859095100105050100150200 TTA g/l% C ESULFIDITY=0%SULFIDITY=15%SULFIDITY=30%O PERATING CE5%6 FREE CaO vs CAUSTICITY0123456770758085% CAUSTICITY% FREE LIMEFLOWSHEETWITH CLARIFIERSS melt TankGreen LiquorClarifierDregs FilterSlaker /CausticizersWhit
1 tappi kraft recovery short course recausticizing chapter 2.1 - principles and practice by dale sanchez vector process equipment inc. topics • basic chemistry • flowsheet options • green liquor preparation • white liquor preparation • lime mud washing • controls
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