METHOD OF PRODUCING SEMI-CELLULOSE
收藏国家林业和草原科学数据中心2023-02-12 更新2024-03-07 收录
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FIELD: paper. SUBSTANCE: invention relates to pulp and paper industry and can be used in production of fibrous semi-products， in particular， semi-pulp for paper making. Initial raw material for production of semi-cellulose is represented by wood wastes - birch sawdust formed when birch wood is produced from standard chips - basic (traditional) raw material for production of fibrous semi-finished products of pulp-and-paper production. Birch sawdust is loaded into autoclave and filled with neutral sulphite cooking solution heated to temperature of 70–75??°C. Boiling solution contains boiling solution represented by NaOH. Then semi-cellulose is brewed at temperature of 156–165??°C and total duration of 95–115 minutes. Produced semi-cellulose is dissolved in a disintegrator into fibres and bundles of fibres and washed with cold water. Then， sorting is carried out on a laboratory scale and grinding is performed on a centrifugal grinder to 27–32??°SR. EFFECT: invention simplifies and reduces the cost of the method of producing semi-cellulose， as well as increases environmental friendliness of the process while maintaining quality parameters of the semi-cellulose， which are not inferior to those of the prototype. 1 cl， 1 tbl
提供机构：
国家林业和草原科学数据中心
创建时间：
2023-02-12
