CN102888773B - Technique for preparing bamboo pulp by cooking to two-grade full-liquid-phase sulphate - Google Patents
Technique for preparing bamboo pulp by cooking to two-grade full-liquid-phase sulphate Download PDFInfo
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- CN102888773B CN102888773B CN201210393598.6A CN201210393598A CN102888773B CN 102888773 B CN102888773 B CN 102888773B CN 201210393598 A CN201210393598 A CN 201210393598A CN 102888773 B CN102888773 B CN 102888773B
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Abstract
The invention provides a preparation technique of bamboo pulp by a bamboo material, and belongs to the technical field of chemical fibers. The preparation technique of the bamboo pump comprises the following steps of: cutting the bamboo material into bamboo chips which are 20-50mm in length and 10-20mm in width; washing, and putting the bamboo chips into a pot; finishing the cooking to first-grade full-liquid-phase (i.e., the bamboo chips in the cooking pot are just immersed by the cooking liquid in the cooking pot) sulphate, wherein the cooking liquid is high-alkali-concentration black liquid discharged in the cooking of the second-grade full-liquid-phase sulphate; exchanging the black liquid of the first-grade cooking by pumping the fresh alkali liquid to perform the second-grade full-liquid-phase cooking; recovering the heat energy of the black liquid discharged in the first-grade full-liquid-phase cooking, and then sending the black liquid for alkali recovery; fully recovering the black liquid discharged in the cooking to the second-grade full-liquid-phase sulphate; after the two-grade cooking is finished, dressing by washing, and then performing O-D0-EOP-D1 bleaching and acid treatment; and finally, making the bamboo pulp. By the preparation technique, the bamboo pulp is uniform and stable in mass, and low in lignin content; the black liquid is high in Baume degree and small in erosion to equipment; waste water and water gas are easy to treat; and the investment cost is saved. The prepared bamboo pulp is used for producing viscose.
Description
Technical field
The present invention relates to the full liquid phase sulphate cook of a kind of two-stage and prepare the technique of bamboo pulp, belong to chemical fiber field.
Background technology
Due to the Devoting Major Efforts To Developing of people's recent years to environmental protection, renewable resource, the utilization rate of bamboo resource is constantly improved, as the bamboo pulp of high added value, so unique moisture-absorbing sweat-removing after spinning, antibacterial, anti-ultraviolet function and occurred fierce market competition situation.People constantly repay the new explained hereafter bamboo pulp of examination and have also obtained many progress.Except traditional sulphite process, prehydrolytic sulfate process, developed again alkaline-heating method twice, this technology investment is low, carrying capacity of environment is light, is quite applicable to small business and adopts.Specifically, mainly contain four large class techniques, the one, adopt bleached bamboo pulp plate to carry out secondary boiled degenerative treatments; The 2nd, adopt and do not float true qualities bamboo pulp plate and after preimpregnation mixes, carry out secondary boiledly, then carry out bleaching; The 3rd, adopt bamboo chip to copy well-thought-out plan pulpboard through the after bleaching of a sulphate cook pulping, then carry out secondary soda cooking; The 4th, adopt bamboo chip first through micro-caustic soda, to precook, then carry out soda cooking for the second time, then carry out bleaching.In above four class techniques, first three plants technique carrying out when secondary boiled all must using rotary spherical digester, has limited its production capacity, and the cooking liquor of this four classes technique is lower than all, and the uniformity of reaction is not good enough, and products obtained therefrom first fibre content is generally in 90% left and right, and the degree of polymerization is lower.
Summary of the invention
The object of this invention is to provide the full liquid phase sulphate cook of a kind of two-stage and prepare the technique of bamboo pulp.The full liquid phase cooking of this process using two-stage, adverse current boiling technology, not only greatly improved bamboo pulp quality uniformity, improved and sent evaporation black liquid wave hairdressing, but also saved the heating-up time, the object that reached energy-saving and emission-reduction, increases production and improves productivity; The present invention, owing to not adopting pre-hydrolysis technique, does not have acid solution to produce, and digesting apparatus is not had to specific (special) requirements, does not need to design stainless steel digester, can save most of investment.
The present invention adopts D0-EOP-D1 bleaching process, makes to float disposed slurry and has the advantages that whiteness is high, intensity is suitable, the fine content of first is high, and the content of alphacellulose of bamboo pulp can reach 95%, and yield reaches 33%, has good reactivity worth.
Technique of the present invention comprises following processing step:
(1) get the raw materials ready: bamboo wood is cut into long 20-50mm, the rectangle bamboo chip of wide 10-20 mm, qualification rate reaches more than 80%.
(2) wash material: bamboo chip removes surperficial impurity after washing material, the clarity that improves pulp for rear operation creates conditions.
(3) the full liquid phase sulphate cook of the first order: carry out in digester, cooking liquor used is all that the second level full liquid phase sulphate cook terminal discharges high-alkali concentrated black liquid.Technological parameter is: this section of total alkali is with Na
2o meter is 12-18% to over dry bamboo chip weight, and sulphidity is with Na
2o counts 15-25%, and 0.65-0.75MPa protects 90-180 minute.
(4) the full liquid phase sulphate cook in the second level: carry out in digester, cooking liquor used is all fresh alkali lye, pumps into after the full liquid phase sulphate cook of the first order finishes; Meanwhile, the first order boiling high temperature black liquor displacing send corresponding storagetank, after recovery heat energy, send alkali to reclaim.The black liquor that the full liquid phase sulphate cook in the second level finishes to discharge all carries out reuse, as the full liquid phase sulphate cook of first order boiling alkali lye.Technological parameter is: this section of total alkali is with Na
2o meter is 22-30% to exhausted bamboo chip weight, and sulphidity is with Na
2o counts 15-25%, and 0.65-0.75 MPa protects 90-180 minute.
(5) after second level boiling completes, reclaim and put pot operation, gained slurry is copied into pulp after acid treatment is floated in washing.By this technique gained bamboo pulp for cellulose viscose, content of alphacellulose >=94%, pentosan≤4.5%, whiteness >=82%, iron part≤20ppm, ash content≤0.12%.
The specific embodiment
The specific embodiment of being prepared bamboo pulp by bamboo wood is as follows:
Embodiment 1
Bamboo wood is washed after material through getting the raw materials ready, by 200kg/m
3dress pot density install after pot, carry out the full liquid phase sulphate cook of the first order.Cooking liquor used is that the second level full liquid phase sulphate cook terminal discharges high concentrated base black liquor, the digester inner cooking liquid complete bamboo chip in submergence digester just during boiling.Technological parameter is: alkali charge is with Na
2o meter is to over dry bamboo chip weight 12%, and sulphidity is with Na
2o meter 17%, 0.65MPa protects 120 minutes.First order boiling finishes to discharge black liquor, by the alkali charge that over dry bamboo chip is weighed to 26%, adds fresh alkali lye, and alkali lye sulphidity 17% carries out the full liquid phase sulphate cook in the second level, and 0.65MPa protects blowing after 120 minutes.Gained slurry carries out acid treatment after washing, screening and ClO 2 bleaching, finally copies into pulpboard, obtains the bleached bamboo pulp dregs of rice, content of alphacellulose 94%, whiteness 82%, iron part 18ppm, ash content 0.10%.
Embodiment 2
Bamboo wood is washed after material through getting the raw materials ready, and by the dress pot density of 200kg/m3, installs after pot, carries out the full liquid phase sulphate cook of the first order.Cooking liquor used is that the second level full liquid phase sulphate cook terminal discharges high-alkali concentrated black liquid, the digester inner cooking liquid complete bamboo chip in submergence digester just during boiling.Technological parameter is: alkali charge is with Na
2o meter is to over dry bamboo chip weight 18%, and sulphidity is with Na
2o meter 20%, 0.7MPa protects 120 minutes.Then by the alkali charge that over dry bamboo chip is weighed to 22%, add fresh alkali lye, alkali lye sulphidity 20%, carries out the full liquid phase sulphate cook in the second level, and 0.70MPa protects blowing after 120 minutes.Gained slurry carries out acid treatment after washing, screening and ClO 2 bleaching, finally copies into pulpboard, obtains the bleached bamboo pulp dregs of rice, content of alphacellulose 94.5%, whiteness 88%, iron part 15ppm, ash content 0.09%.
Embodiment 3
Bamboo wood is washed after material through getting the raw materials ready, and by the dress pot density of 200kg/m3, installs after pot, carries out the full liquid phase sulphate cook of the first order.Cooking liquor used is that the second level full liquid phase sulphate cook terminal discharges high-alkali concentrated black liquid, the digester inner cooking liquid complete bamboo chip in submergence digester just during boiling.Technological parameter is: alkali charge is with Na
2o meter is to over dry bamboo chip weight 16%, and sulphidity is with Na
2o meter 20%, 0.75MPa protects 90 minutes.Then by the alkali charge that over dry bamboo chip is weighed to 24%, add fresh alkali lye, alkali lye sulphidity 20%, carries out the full liquid phase sulphate cook in the second level, and 0.75MPa protects blowing after 90 minutes.Gained slurry carries out acid treatment after washing, screening and ClO 2 bleaching, finally copies into pulpboard, obtains the bleached bamboo pulp dregs of rice, content of alphacellulose 95.2%, whiteness 86%, iron part 11ppm, ash content 0.1%.
Claims (3)
1. the full liquid phase sulphate cook of two-stage is prepared a technique for bamboo pulp, it is characterized in that: according to following steps, complete: bamboo wood is washed after material through getting the raw materials ready, by 200kg/m
3dress pot density install after pot, carry out the full liquid phase sulphate cook of the first order; Cooking liquor used is that the second level full liquid phase sulphate cook terminal discharges high concentrated base black liquor, the digester inner cooking liquid complete bamboo chip in submergence digester just during boiling; Technological parameter is: alkali charge is with Na
2o meter is to over dry bamboo chip weight 12%, and sulphidity is with Na
2o meter 17%, 0.65MPa protects 120 minutes; First order boiling finishes to discharge black liquor, by the alkali charge that over dry bamboo chip is weighed to 26%, adds fresh alkali lye, and alkali lye sulphidity 17% carries out the full liquid phase sulphate cook in the second level, and 0.65MPa protects blowing after 120 minutes; Gained slurry carries out acid treatment after washing, screening and ClO 2 bleaching, finally copies into pulpboard, obtains the bleached bamboo pulp dregs of rice, content of alphacellulose 94%, whiteness 82%, iron part 18ppm, ash content 0.10%.
2. the full liquid phase sulphate cook of two-stage is prepared a technique for bamboo pulp, it is characterized in that: according to following steps, complete: bamboo wood is washed after material through getting the raw materials ready, by 200kg/m
3dress pot density install after pot, carry out the full liquid phase sulphate cook of the first order; Cooking liquor used is that the second level full liquid phase sulphate cook terminal discharges high-alkali concentrated black liquid, the digester inner cooking liquid complete bamboo chip in submergence digester just during boiling; Technological parameter is: alkali charge is with Na
2o meter is to over dry bamboo chip weight 18%, and sulphidity is with Na
2o meter 20%, 0.7MPa protects 120 minutes; Then by the alkali charge that over dry bamboo chip is weighed to 22%, add fresh alkali lye, alkali lye sulphidity 20%, carries out the full liquid phase sulphate cook in the second level, and 0.70MPa protects blowing after 120 minutes; Gained slurry carries out acid treatment after washing, screening and ClO 2 bleaching, finally copies into pulpboard, obtains the bleached bamboo pulp dregs of rice, content of alphacellulose 94.5%, whiteness 88%, iron part 15ppm, ash content 0.09%.
3. the full liquid phase sulphate cook of two-stage is prepared a technique for bamboo pulp, it is characterized in that: according to following steps, complete: bamboo wood is washed after material through getting the raw materials ready, by 200kg/m
3dress pot density install after pot, carry out the full liquid phase sulphate cook of the first order; Cooking liquor used is that the second level full liquid phase sulphate cook terminal discharges high-alkali concentrated black liquid, the digester inner cooking liquid complete bamboo chip in submergence digester just during boiling; Technological parameter is: alkali charge is with Na
2o meter is to over dry bamboo chip weight 16%, and sulphidity is with Na
2o meter 20%, 0.75MPa protects 90 minutes; Then by the alkali charge that over dry bamboo chip is weighed to 24%, add fresh alkali lye, alkali lye sulphidity 20%, carries out the full liquid phase sulphate cook in the second level, and 0.75MPa protects blowing after 90 minutes; Gained slurry carries out acid treatment after washing, screening and ClO 2 bleaching, finally copies into pulpboard, obtains the bleached bamboo pulp dregs of rice, content of alphacellulose 95.2%, whiteness 86%, iron part 11ppm, ash content 0.1%.
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Effective date of registration: 20200724 Address after: Group 2, Guangzhao village, Jiangmen Town, Xuyong County, Luzhou City, Sichuan Province, 646400 Patentee after: Luzhou Yongfeng pulp and Paper Co., Ltd Address before: 614500, Yongfu street, Muchuan County, Leshan, Sichuan Patentee before: SICHUAN YONGFENG PAPER-MAKING JOINT-STOCK Co.,Ltd. |