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Technique for preparing bamboo pulp by cooking to two-grade full-liquid-phase sulphate

A technology of sulfate and bamboo pulp, applied in the direction of pulping with inorganic alkali, can solve the problems of poor reaction uniformity, low cooking liquor ratio, low degree of polymerization, etc., and achieve suitable strength, high whiteness, good The effect of reactivity

Active Publication Date: 2013-01-23
泸州永丰浆纸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above four types of processes, the first three processes must use steaming balls for secondary cooking, which limits their production capacity. The cooking liquid ratio of these four types of processes is relatively low, and the uniformity of the reaction is not good. The content is generally about 90%, and the degree of polymerization is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Bamboo after material preparation and washing, according to 200kg / m 3 After filling the pot with the density of the pot, carry out the first stage full liquid phase sulfate cooking. The cooking liquid used is the high-concentration alkali black liquor discharged at the end of the second-stage full-liquid-phase sulfate cooking. When cooking, the cooking liquid in the cooking pot just completely submerges the bamboo chips in the cooking pot. The process parameters are: the amount of alkali used is based on Na 2 O is 12% relative to the weight of absolute dry bamboo chips, and the degree of sulfidation is based on Na 2 O is 17%, and 0.65MPa is guaranteed for 120 minutes. After the first stage of cooking, the black liquor is discharged, and the fresh lye is added according to the amount of alkali used for 26% of the weight of the absolute dry bamboo chips. After feeding. The obtained slurry is washed, screened, bleached with chlorine dioxide, acid-treated, and finally m...

Embodiment 2

[0015] After the bamboo material is prepared and washed, the pot is packed according to the packing density of 200kg / m3, and then the first stage full-liquid phase sulfate cooking is carried out. The cooking liquid used is the high-alkaline concentrated black liquor discharged at the end of the second-stage full-liquid phase sulfate cooking. When cooking, the cooking liquid in the cooking pot just completely submerges the bamboo slices in the cooking pot. The process parameters are: the amount of alkali used is based on Na 2 O is 18% relative to the weight of absolute dry bamboo chips, and the degree of sulfidation is based on Na 2 O is 20%, and 0.7MPa is guaranteed for 120 minutes. Then add fresh lye according to the amount of alkali that is 22% of the weight of the absolute dry bamboo chips, the degree of sulfide of the lye is 20%, and carry out the second-stage full-liquid phase sulfate cooking, and discharge after 120 minutes at 0.70MPa. The obtained slurry is washed, sc...

Embodiment 3

[0017] After the bamboo material is prepared and washed, the pot is packed according to the packing density of 200kg / m3, and then the first stage full-liquid phase sulfate cooking is carried out. The cooking liquid used is the high-alkaline concentrated black liquor discharged at the end of the second-stage full-liquid phase sulfate cooking. When cooking, the cooking liquid in the cooking pot just completely submerges the bamboo slices in the cooking pot. The process parameters are: the amount of alkali used is based on Na 2 O is 16% to the absolute dry bamboo weight, and the degree of sulfidation is based on Na 2 O is 20%, and 0.75MPa is guaranteed for 90 minutes. Then add fresh lye according to the amount of alkali that is 24% of the weight of the absolute dry bamboo chips, the degree of sulfide of the lye is 20%, and carry out the second-stage full-liquid phase sulfate cooking, and discharge after 90 minutes at 0.75MPa. The obtained pulp is washed, screened, bleached with...

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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 [0001] The invention relates to a process for preparing bamboo pulp by two-stage full-liquid-phase kraft cooking, which belongs to the technical field of chemical fibers. Background technique [0002] Due to the vigorous development of green environmental protection and renewable resources in recent years, the utilization rate of bamboo resources has been continuously improved. As a high-value-added bamboo pulp, it has unique functions of moisture absorption and perspiration, antibacterial and anti-ultraviolet rays after spinning. And there is fierce market competition. People constantly try new techniques to produce bamboo pulp and have made many progresses. In addition to the traditional sulfite method and pre-hydrolysis sulfate method, a two-time alkaline cooking method has been developed. This process has low investment and light environmental load, and is quite suitable for small enterprises to adopt. Specifically, there are four main types of processe...

Claims

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Application Information

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IPC IPC(8): D21C3/02
CPCY02P70/10
Inventor 吴和均曾自银吴和岭陈丙才
Owner 泸州永丰浆纸有限责任公司
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