Clean pulping technology for high-polymerization-degree bamboo pulp
A technology of clean pulping and high degree of polymerization, applied in pulping with inorganic alkali, pulp dehydration, pulp bleaching, etc., can solve problems such as backward technology, pollution, and insufficient raw materials for high-polymerization dissolving pulp production, and solve the difficulty of governance Larger, the effect of reducing impact and harm
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Embodiment 1
[0064] (1) Cut the bamboo directly into lengths of 10-50mm and widths of 5-20mm, and use a dry method to remove impurities such as mud sand, knots, and chips through a dust collector. After dust removal, send it to a cooking pot for pre-hydrolysis treatment. : 0.5, the temperature is 150°C, and the holding time is 80 minutes;
[0065] (2) After hydrolysis, the slurry is subjected to hot alkali extraction, and the amount of alkali used is 6% (Na 2 O meter), lye concentration 85g / L (Na 2 O meter), time 100min, temperature 140℃;
[0066] (3) The pulp after extraction is cooked by kraft method, and the amount of alkali used is 30% (Na 2 O meter), the holding time is 30min, the temperature is 130℃, the liquid ratio is 1:4, and the vulcanization degree is 15%;
[0067] (4) O P D. 0 E. OP (P ax D. 1 ) A bleaching, bleaching technical conditions are: O P Bleaching means that after being preheated by the double-roller mixer, it enters the medium-consistency pump standpipe, the...
Embodiment 2
[0070] (1) Cut bamboo directly into lengths of 10-50mm and widths of 5-20mm, using a wet method, wash off surface impurities and remove excess water after a grass washer, and then enter a digester for pre-hydrolysis treatment, with a liquid ratio of 1: 1.3, the temperature is 130°C, and the holding time is 180min;
[0071] (2) After hydrolysis, the slurry is subjected to hot alkali extraction, and the amount of alkali used is 15% (Na 2 O meter), lye concentration 80g / L (Na 2 O gauge), time 40min, temperature 100℃;
[0072] (3) The extracted slurry is cooked by caustic soda method, and the amount of alkali used is 15% (Na 2 O meter), holding time 120min, temperature 160℃, liquid ratio 1:3;
[0073] (4) O P D. 0 E. OP (P ax D. 1 ) A bleaching, the bleaching process is as embodiment 1, and the bleaching technical conditions are respectively: O P Bleaching technical conditions, slurry concentration 16%, tower top pressure 0.4MPa, temperature 80°C, time 90min, relative to ...
Embodiment 3
[0076] (1) Cut the bamboo directly into 10-50mm long and 5-20mm wide, and use dry-wet combination method to prepare materials. Firstly, after dedusting by dust collector, then wash by grass washing machine and remove excess water, then enter the digester for pre-processing. Hydrolysis treatment, the liquid ratio is 1:1.0, the temperature is 100°C, and the holding time is 120min;
[0077] (2) After hydrolysis, the slurry is subjected to cooking hot alkali extraction, relative to the quality of the absolute dry material, the amount of alkali used is 12% (Na 2 O meter), lye concentration 50g / L (Na 2 O gauge), time 60min, temperature 120℃;
[0078] (3) The pulp after extraction is cooked by kraft method, relative to the quality of absolute dry material, the amount of alkali used is 10% (Na 2 O meter), the holding time is 120min, the temperature is 170℃, the liquid ratio is 1:6, and the vulcanization degree is 30%;
[0079] (4) O P D. 0 E. OP (P ax D. 1 ) A bleaching, the b...
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