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Bamboo pulping method

A technology of bamboo and production method, applied in the field of pulping and papermaking, can solve the problems of high equipment requirements and difficult implementation, and achieve the effects of improving cooking efficiency, improving production efficiency, and reducing cooking alkali consumption

Active Publication Date: 2011-08-17
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bamboo EMCC cooking with this optimal process condition can obtain bamboo pulp with a Kappa value of 12.5, a fine pulp yield of 44.8% and a viscosity of 1031g / mL. This method requires high equipment and is difficult for most domestic enterprises to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The bamboo is cut with a drum chipper, broken and cut to make bamboo chips; the bamboo chips obtained in the previous step are accumulated and stored for 3 months; 3 In a vertical cooking pot, add 28m 3 Cooking liquid, the degree of sulfide in the cooking liquid is 22%, and the alkali content in terms of NaOH is 2500kg. After the pot is installed, it is cooked. The heating process of cooking is as follows: the initial temperature is raised to 130°C for 30 minutes, and the temperature is 125°C after a small steam release. 3. It takes 35 minutes to raise the temperature to 165°C, and it takes 50 minutes to continue to heat up to 175°C, and it takes 30 minutes to keep warm at 175°C. , after depressurization, it is sprayed and discharged, and the temperature is raised by directly passing steam into the cooking pot to raise the temperature. The steam discharged during the depressurization and exhaust process enters another digester for heating at the initial stage of cooking...

Embodiment 2

[0019] The bamboo is cut with a drum chipper, broken and cut to make bamboo chips; the bamboo chips obtained in the previous step are accumulated and stored for 2 months; 3 In a vertical cooking pot, add 28m 3 Cooking liquid, the degree of sulfidation in the cooking liquid is 24%, and the alkali content in terms of NaOH is 2900kg. After the pot is installed, the cooking is carried out. The heating process of cooking is as follows: the initial temperature is raised to 135°C for 35 minutes, and the temperature is 130°C after a small release of steam. 1. It takes 25 minutes to raise the temperature to 160°C, continue to heat up to 173°C, and take 40 minutes to keep warm at 175°C for 25 minutes. Minutes, spray after depressurization, heat up by directly passing steam into the cooking pot, and the steam discharged during the depressurization and exhaust process enters another digester, which is used for heating up in the initial stage of cooking.

[0020] After cooking, the coarse...

Embodiment 3

[0022] The bamboo is cut with a drum chipper, broken and cut to make bamboo chips; the bamboo chips obtained in the previous step are accumulated and stored for 75 days; 3 In a vertical cooking pot, add 28m 3 Cooking liquid, the degree of sulfidation in the cooking liquid is 23%, and the alkali content in terms of NaOH is 2900kg. After the pot is installed, it is cooked. The heating process of cooking is as follows: the initial temperature rises to 140°C for 40 minutes, and the temperature after a small release of steam is 135°C 1. Raise the temperature to 163°C for 30 minutes, continue to heat up to 170°C for 45 minutes, and keep warm at 170°C for 20 minutes. Minutes, spray after depressurization, and heat up by directly passing steam into the cooking pot to raise the temperature. The steam discharged during the depressurization and exhaust process enters the condenser, and is discharged after heat exchange and condensation. The hot water obtained by heat exchange is used for...

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Abstract

The invention discloses a bamboo pulping method, which comprises the following steps of: cutting and crushing bamboos to form bamboo chips; stacking and storing the bamboo chips obtained in the last step for 2 to 3 months; and washing the bamboo chips obtained in the last step, filling the bamboo chips into a digester, and then performing digestion under the conditions that: the alkali consumption amount (based on NaOH) of the digestion solution is 20 to 25 percent of the weight of the absolute dry bamboo chips, and the vulcanization degree of the digestion solution is 22 to 24 percent; in the temperature rise process, the initial temperature is raised to 130 to 140 DEG C for 30 to 40 minutes; the temperature is 125 to 135 DEG C after low exhaust and raised to 160 to 165 DEG C for 25 to 35 minutes; the temperature is raised to 170 to 175 DEG C for 40 to 50 minutes; the temperature of 170 to 175 DEG C is preserved for 20 to 30 minutes; and after the temperature preservation is finished, steam is exhausted through an exhaust port on the upper part of the digester, the pressure is reduced to 0.5 to 0.6MPa for 5 to 10 minutes, and the steam is blown after the pressure is reduced.

Description

Technical field [0001] The present invention is the field of pulp and papermaking, involving a kind of production method of pulp, especially the production method that uses bamboo to produce sulfate noodles. Background technique [0002] With the rapid development of the national economy, the demand for paper and paper products has increased sharply, and my country's papermaking wood raw materials are extremely short, which leads to a huge gap in the papermaking industry in my country. It also made my country's paper industry pollution serious, and the pressure of environmental protection was increasing.On the other hand, my country's bamboo resources are abundant, and bamboo slurry papermaking performance is good.In order to make up for the lack of wood slurry raw materials, reduce the pollution of pulp and paper on the environment, promote the sustainable development of the paper industry in my country, and the development of bamboo resources is of great significance.However, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21C3/02D21C1/02D21B1/38
Inventor 胥端祥苏德良刘便初李忠德梁少峰李勋潘贞叶
Owner YUEYANG FOREST & PAPER CO LTD
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