papr10 - Chemical Recovery Lecture 10 PAPR 1000...

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1 Chemical Recovery Lecture 10 PAPR 1000 Introduction to Pulp and Paper Manufacturer
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3 Recovery of Pulping Liquors Recovery of Pulping Liquors ± Recover chemicals used in the cooking process ± Recover and beneficially use the thermal energy from combustion of the organics ± Removal and sale of any valuable organic by- product chemicals
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5 Chemical Recovery Chemical Recovery ± For each ton of pulp produced, 3000 – 5000 gallons of black liquor produced ± Black liquor contains – Organics – dissolved wood components – Inorganics – cooking chemicals, now in spent (inactive) form ± Solids content of black liquor (weak black liquor) from washer: 12-16%
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6 Chemical Recovery Cont Chemical Recovery Cont d d ± For economic and environment reasons, the black liquor MUST be recovered– hence the Chemical Recovery System ± Goals – Burn organics to generate heat – Convert inactive cooking chemicals back to active form
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7 Chemical Recovery: Evaporators Chemical Recovery: Evaporators
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papr10 - Chemical Recovery Lecture 10 PAPR 1000...

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