Method and apparatus for producing nanofibrillated cellulose
A nano-fibrillation and nano-fibril technology, which is applied in the fields of cellulose pulp post-treatment modification, fiber raw material treatment, pulp beating/refining method, etc., can solve high energy consumption, high friction of refiner blade components, High apparent viscosity and other issues, to achieve the effect of low energy consumption
Active Publication Date: 2021-09-28
VALMET TECH OY
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Problems solved by technology
As mentioned above, nanofibrillated cellulose is a gel-like material and thus has a high apparent viscosity, so the frictional forces affecting the blade elements of the refiner are very high, resulting in high energy in the production of nanofibrillated cellulose. consumption
High energy consumption increases the production cost of nanofibrillated cellulose, thus limiting the economically viable applications of nanofibrillated cellulose, for example
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[0018] figure 1 A device 1 for producing nanofibrillated cellulose is schematically shown. Nanofibrillated cellulose refers to cellulose microfibrils or bundles of microfibrils isolated from lignocellulose-containing fibrous raw materials, such as wood. Common synonyms for nanofibrillated cellulose are, for example, nanofibrillated cellulose (NFC), nanocellulose, microfibrillar cellulose, cellulose nanofibers, nanoscale cellulose, microfibrillated cellulose (MFC) or fibers Prime microfibrils. In this context, the term nanofibrillated cellulose refers to cellulose having a particle size in one or more dimensions, i.e. microfibrils or bundles of microfibrils, usually but not limited to less than 100 nm (ISO / TC 229 nm technology, date of creation: 2005).
[0019] The plant 1 for producing nanofibrillated cellulose comprises a pretreatment stage 2 , a refining stage 3 and a posttreatment stage 4 .
[0020] Pretreatment stage 2 consists in the preparation of a fiber suspension,...
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Abstract
A method and an apparatus (1) for producing nanofibrillated cellulose are provided. A fibrous material containing lignocellulose is refined to separate nanofibrils. The method comprises: refining a lignocellulose-containing fibrous material in at least one refining zone (20) in one or more refiners (5) to separate nanofibrils; supplying the fibrous material to be refined through at least one opening (12, 19) in a refining surface (11, 18) of at least one refining element (7, 13) to at least one refining region of at least one refining machine, and / or discharging the fibrous material refined in at least one refining region of at least one refining machine from the at least one refining region through at least one opening (12, 19) in the refining surface (11, 18) of at least one refining element (7, 13), and operating the at least one refining machine to produce a specific edge load (SEL) of less than 3 J / m during refining.
Description
technical field [0001] The present invention relates to a method for producing nanofibrillar cellulose, wherein a fibrous material containing lignocellulose is refined to separate nanofibrils. [0002] The invention also relates to a plant for producing nanofibrillated cellulose comprising one or more refiners for refining lignocellulose-containing fibrous material to separate nanofibrils. Background technique [0003] Nanofibrillated cellulose refers to cellulose microfibrils or bundles of microfibrils isolated from lignocellulose-containing fibrous raw materials, such as wood. Nanofibrillated cellulose is characterized by a large specific surface area and strong hydrogen bond forming ability. In aqueous dispersion, nanofibrillated cellulose is a colorless gel-like material. Nanofibrillated cellulose can be used, for example, as an additive in the manufacture of new bio-based products. [0004] In general, the production of nanofibrillated cellulose by refining requires ...
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IPC IPC(8): D21C5/00D21D1/20D21D1/22D21D1/24
CPCD21C1/02D21D1/004D21D1/20D21C5/00D21D1/22D21D1/24C08B15/08D21C9/007D21H11/18C08L1/02D21D1/00D21H11/16B02C7/12
Inventor 尤哈-佩卡·胡赫塔宁P·索科
Owner VALMET TECH OY