Process for producing fibrous material from wood
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United States of America Patent
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Jun 24, 2014
Grant Date -
Feb 11, 2010
app pub date -
Apr 4, 2007
filing date -
Jun 8, 2006
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Abstract
A process for producing fibrous material which includes the following: preparing a solution of chemicals that includes less than 25% of sulphite (calculated as Na2SO3), based on the oven-dry amount of the lignocellulosic raw material; mixing the solution of chemicals with wood in a specified liquor material; heating the solution of chemicals and the wood to a temperature above room temperature; and then either of the following alternatives: (1) removing the free-flowing solution of chemicals and digestion of the wood in the vapor phase; (2) having the wood digested in the liquid phase and separating the free-flowing solution of chemicals and the wood.
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