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Method for pulping by cooking solid base in plant fiber

A plant fiber and solid alkali technology, which is applied in the pulp beating method, pulping with inorganic alkali, digester, etc., can solve the problems of long processing time and long production cycle, and achieve the effect of improving the utilization rate of raw materials

Inactive Publication Date: 2011-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing time is long, resulting in a long production cycle, and there is still a certain distance from the realization of industrialized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The cellulose raw material is masson pine wood chips, which have a cellulose content of 38%, a hemicellulose content of 20%, and a lignin content of 25% by weight; the size of the wood chips is about 4 to 5 cm 2 . The masson pine wood chips are pretreated into a single root or a single piece of raw material with a length of 1-3cm. Adding solid alkali, O 2 、H 2 o 2 And water, adopt solid alkali type to be MgO; In terms of weight ratio, solid alkali consumption is equivalent to 30% of raw material absolute dry weight; O 2 In terms of oxygen pressure, it is 3MPa; in terms of weight ratio, H 2 o 2 The dosage is equivalent to 2% of the absolute dry weight of raw materials, H 2 o 2 Mix it with water and add it to the raw material 0.5h before cooking to impregnate it; in terms of weight ratio, the amount of water used is equivalent to 10 times the absolute dry weight of the raw material. The solid alkali cooking and pulping reaction is carried out at a temperature of 1...

Embodiment 2

[0035] The raw material of cellulose is rice straw, by weight, 40% of cellulose, 25% of hemicellulose, and 15% of lignin; it is washed before use and cut into about 2cm long. In the solid alkali cooking reaction system, the type of solid alkali used is Mg(OH) 2 ; The cooking reaction system is made of cellulose raw material, solid alkali, O 2 、H 2 o 2 And water composition; In terms of weight ratio, the solid alkali consumption is equivalent to 15% of raw material absolute dry weight; O 2 In terms of oxygen pressure, it is 1MPa; in terms of weight ratio, H 2 o 2 The dosage is equivalent to 15% of the absolute dry weight of raw materials, H 2 o 2 Mix it with water and add it to the raw material 2 hours before cooking to play the role of impregnation; the amount of water used is equivalent to 4 times the dry weight of the raw material. The solid alkali cooking and pulping reaction is carried out at a temperature of 165°C. The reaction time includes a heating time of 1.5h ...

Embodiment 3

[0042] The cellulose raw material is wheat straw, which has a cellulose content of 45%, a hemicellulose content of 30%, and a lignin content of 15% in terms of weight ratio; before use, it is cut into about 1 cm long and washed. The solid base used is CaO / NaY (zeolite); In the reaction system, in terms of weight ratio, the solid base consumption is equivalent to 15% of the absolute dry weight of the raw material; 2 2MPa in terms of oxygen pressure; H 2 o 2 The dosage is equivalent to 13% of the absolute dry weight of raw materials, H 2 o 2 Mix it with water and add it to the raw material for impregnation 1.5 hours before cooking; the amount of water used is equivalent to 6 times the absolute dry weight of the raw material. The solid alkali cooking and pulping reaction is carried out at a temperature of 170°C. The reaction time includes a heating time of 1.5h (from 0°C to 170°C) and a holding time of 2.0h (the temperature is maintained at 170°C); The lignin removal rate>91....

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Abstract

The invention discloses a method for pulping by cooking solid base in a plant fiber, comprising three steps such as pre-processing, cooking pulping and unbleached pulp preparation; in the step of cooking pulping, the pre-processed plant fiber raw material is added with solid base, O2, H2O2 and water, the temperature is raised to 125-175 DEG C within 1-2.5h and then maintained, and mixed slurry isobtained after reaction; the solid base is the solid base which is slightly soluble in water or the solid base which is resistant to wash load; in the step of unbleached pulp preparation, the mixed slurry is filtered by a pressurized screen with aperture not more than 40 meshes or squeezed to obtain unbleached pulp and suspension of solid products of cellulose containing hemicellulose. In the cooking reaction process of the invention, the environment-friendly solid base containing Ca and Mg, O2, H2O2 and other clean chemicals are used. The solid base can be recycled by simple methods without producing pollution, thus conducing to technology industrialization of clean production of cooking pulping, cellulose energy ethanol and conversion of high-value chemicals.

Description

technical field [0001] The invention relates to the application of plant fibers, in particular to a method for pulping by solid alkali cooking of plant fibers. Background technique [0002] Cellulose raw materials generally contain 35% to 45% of cellulose, 20% to 30% of hemicellulose, and 15% to 25% of lignin. Cooking pulping is the use of chemical methods to remove the lignin components of plant fiber raw materials, and to separate cellulose and part of hemicellulose. Cooking and pulping is an important process in the paper industry, and it is also an important pretreatment method in cellulosic ethanol and future biomass energy and chemical industry systems. [0003] At present, the cooking and pulping of plant fiber raw materials generally use sulfur-containing and caustic soda chemicals such as Na 2 S, Na 2 SO 4 、Na 2 SO 3 , CaSO 3 , NaOH and Na 2 CO 3 etc. The waste liquid produced by cooking, such as black liquor, has a large pollution load and is difficult to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C7/00D21B1/06D21D1/02
Inventor 林鹿庞春生
Owner SOUTH CHINA UNIV OF TECH
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