Abstract: A pulp production process can produce pulp at high yield without using sodium sulfide and high-temperature/high-pressure conditions if compared with the Kraft process and also collect lignin. Pulp is produced by processing wood chips for hydrophlicization at room temperature, using a dilute caustic soda aqueous solution, selectively partially modifying lignin in dilute nitric acid and digesting the wood chips by means of a dilute caustic soda aqueous solution under the atmospheric pressure. Lignin is agglomerated and sorted out from the isolated black liquor.
Type:
Grant
Filed:
January 15, 2008
Date of Patent:
September 18, 2012
Assignees:
Nihon Cellulose Co., Ltd., Kabushiki Kaisha Toa Kogyo
Abstract: A pulp production process can produce pulp at high yield without using sodium sulfide and high-temperature/high-pressure conditions if compared with the Kraft process and also collect lignin. Pulp is produced by processing wood chips for hydrophlicization at room temperature, using a dilute caustic soda aqueous solution, selectively partially modifying lignin in dilute nitric acid and digesting the wood chips by means of a dilute caustic soda aqueous solution under the atmospheric pressure. Lignin is agglomerated and sorted out from the isolated black liquor.
Type:
Application
Filed:
January 15, 2008
Publication date:
July 15, 2010
Applicants:
Nihon Cellulose Co., Ltd., Kabushiki Kaisha Toa Kogyo