TERPENE RECOVERY PROCESS INCLUDING CONTROL OF A DIGESTER RELIEF OUTLET
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Abstract
IMPROVED BATCH KRAFT DIGESTION OF WOOD CHIPS IS OBTAINED BY VENTING DIGESTER VAPORS THROUGH A VALVE AT MAXIMUM OPENING SHORTLY AFTER DIGESTER HEATING IS INITIATED, THEN GRADUALLY REDUCING THE VALVE APERTURE WHILE MAINTAINING DIGESTER PRESSURE ASCENDING GRADUALLY TO A VALUE BETWEEN ABOUT 80 AND ABOUT 120 P.S.I.G., AND THEREAFTER MAINTAINING SUBSTANTIALLY CONSTANT RELEIF FLOW THROUGH THE VALVE
AND SUBSTANTIALLY CONSTANT DIGESTER PRESSURE UNTIL TERPENES ARE SUBSTANTIALLY DEPLETED FROM THE RESULTING PULP.
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