Recovery of pulp mill chemicals

Patent · Tue Nov 10 00:00:00 EST 1981

OSTI ID:5062302

Masuno, K; Nakayama, J; Mizoguchi, Y; Kaneko, M

Oxidation of green liquor, weak white liquor, or the combination of green liquor with waste gases from recovery boilers in pulp mills with air in the presence of Fe salts at 20-95/sup 0/ and pH 8.3-9.0 and causticization with lime gave white liquor for use in digestion of wood chips. Thus, introduction of green liquor and air in a flow rate of 2.5 L/H and 5.7 L/min, respectively, into a vessel containing aqueous alkaline solution having a pH of 8.7, Na concentration of 0.65 mol/L at 70/sup 0/ and 30 mg/L of FeSO/sub 4/ in terms of Fe resulted in almost complete oxidation of Na/sub 2/S in green liquor.

• Assignee: Ebara Mfg. Co., Ltd.
• Patent Number(s): US 4299652
• OSTI ID: 5062302
• Resource Relation: Patent File Date: Filed date 31 Jul 1978
• Country of Publication: United States
• Language: English

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