Methods to decrease scaling in digester systems
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United States of America Patent
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Jul 10, 2007
Grant Date -
Dec 29, 2005
app pub date -
Jun 26, 2004
filing date -
Jun 26, 2004
priority date (Note) -
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Abstract
One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second quantities of cooking liquor having respective first and second calcium concentrations, treating the extracted cooking liquors to produce a cooking liquor having a calcium concentration less that the calcium concentration of the either of the first and second extracted cooking liquors, and, reintroducing the treated cooking liquor to the digester. Another aspect of this invention relates to a method and digester in which through put through the digester is increased by the continuous addition of process liquor into the digester preferably at an upper region of the digester.
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