Pulping technique for straw fibre
A grass and fiber technology, which is applied in the field of pulping process of grass fiber raw materials, can solve the problems of high viscosity of black liquor, difficult recovery, and papermaking hazards.
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preparation example Construction
[0072] Preparation of the raw material sample: The air-dried wheat straw raw material sample was pulverized with a pulverizer (Willey mill), and the obtained powder was screened through a sample sieve, and the part between 40 and 60 mesh was taken, and the water was balanced for analysis.
[0073] Preparation of pulp samples: After dispersing the wet pulp samples, use a copper net covered with a clean white cloth to make a thin pulp sheet on a hand paper machine. After air-drying, tear it into small pieces of 5mm×5mm, and balance the moisture for later use.
Embodiment 1
[0075] In the present embodiment, for the dipping treatment process used in alkaline pulping, 25 cubic meters of steamed balls are used as the cooking vessel. After analysis, the weight percentage of cellulose in the dry wheat straw is 69.96%, and the weight percentage of polypentose is 69.96%. The content is 25.41%, the ash content is 7.35%, the benzene-alcohol extract is 2.35%, and the total lignin is 19.85%. The length of the preliminarily treated wheat straw is 2-3 cm, and 4.8 tons of dry wheat straw are placed in a cooking vessel and heated soaking liquid is added. , The impregnation solution is composed of liquid caustic soda and black liquor. The concentration of adding alkali is the NaOH (sodium hydroxide) solution of the percentage of 14% absolute dry grass weight, the content of sodium hydroxide in the steeping liquid is 28 g / liter, the weight of the dry wheat straw amount (T) and the total liquid amount of the steeping liquid The ratio is 1:2.8. After adding the imp...
Embodiment 2
[0079] With embodiment 1, difference is that the composition of rice straw fiber raw material is: the weight percentage of cellulose is 67.6%, the weight percentage of pentosaccharide is 26.8%, ash content 10.21%, benzene-alcohol extract 2.32%, Total lignin 18.96%.
[0080] In the impregnated wheat straw fiber raw material, the weight percentage of cellulose is 66%, the weight percentage of total lignin is 16.03%, and the weight percentage of pentosaccharide is 20%, all of which are absolute dry raw materials.
[0081] The weight percentage of cellulose in the fiber after one-time cooking is 69.52%, the weight percentage of total lignin is 9.74%, and the weight percentage of pentosaccharide is 19.75%, all of which are relative to absolute dry raw materials.
[0082] The composition of the pulp obtained by secondary cooking is as follows: 75.73% by weight of cellulose, 1.46% by weight of total lignin, and 22.45% by weight of polypentose, all of which are absolute dry raw materi...
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