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Method of cooking pulping by preimpregnation of dendrocalamus giganteus in propylene glycol organic solvent

A technology of organic solvent and propylene glycol is applied in the field of cooking and pulping of Dalong bamboo pre-impregnated with propylene glycol organic solvent. The effect of cooking time

Active Publication Date: 2015-12-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low boiling point, high volatility and flammability of this type of low boiling point organic solvents, the pulping and cooking must be carried out under high pressure, and there are potential safety hazards of flammability, explosion and related accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The Dalong bamboo pre-impregnated propylene glycol organic solvent cooking pulping method, the steps include:

[0019] (1) First, split the Dalong bamboo into bamboo sections with a length of 2cm~3cm and a width of less than 3cm, and use them as raw materials for pulping;

[0020] (2) Add the pulping raw material obtained in step (1) into the propylene glycol analytical pure reagent according to the liquid-solid ratio of 1:15g / ml, pre-impregnate at 60°C for 36 hours, and separate to obtain the impregnated material after pre-impregnation;

[0021] (3) Add the impregnated material into the pulping agent according to the liquid-solid ratio of the pulping raw material and the pulping agent at 1:5.5g / ml, then put it into the chain oil bath cooking pot, and idle for 30 minutes to make the impregnated material in the tank and the pulping agent The slurrying agent is further mixed evenly, and the pulping agent is propylene glycol analytical reagent and citric acid-sulfuric acid...

Embodiment 2

[0026] The Dalong bamboo pre-impregnated propylene glycol organic solvent cooking pulping method, the steps include:

[0027] (1) First, split the Dalong bamboo into bamboo sections with a length of 2cm~3cm and a width of less than 3cm, and use them as raw materials for pulping;

[0028] (2) Add the raw material for pulping obtained in step (1) to the propylene glycol solution that has been treated in step (5) in Example 1 to remove moisture according to the liquid-solid ratio of 1:17g / ml. Immerse for 24 hours, and separate the impregnated material after the pre-impregnation is completed;

[0029] (3) Add the impregnated material into the pulping agent according to the liquid-solid ratio of the pulping raw material and the pulping agent at 1:4.5g / ml, then put it into the chain oil bath cooking pot, and run it idle for 30 minutes to make the impregnated material in the tank and the pulping agent The slurrying agent is further mixed evenly, and the pulping agent is propylene gl...

Embodiment 3

[0034] The Dalong bamboo pre-impregnated propylene glycol organic solvent cooking pulping method, the steps include:

[0035] (1) First, split the Dalong bamboo into bamboo sections with a length of 2cm~3cm and a width of less than 3cm, and use them as raw materials for pulping;

[0036](2) Add the pulping raw material obtained in step (1) to the propylene glycol solution that has been treated in step (5) in Example 2 at a liquid-solid ratio of 1:10 g / ml, and pre-heat at 80°C. Dipping for 36 hours, after the pre-dipping is completed, the impregnated material is separated;

[0037] (3) Add the impregnated material into the pulping agent according to the liquid-solid ratio of the pulping raw material and the pulping agent at 1:8g / ml, then put it into the chain oil bath cooking pot, and run it idle for 30 minutes to make the impregnated material and the pulping agent in the tank Further mix evenly, pulping agent is propylene glycol analytical pure reagent and citric acid-sulfuri...

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Abstract

Belonging to the technical field of pulping, the invention relates to a method of cooking pulping by preimpregnation of dendrocalamus giganteus in a propylene glycol organic solvent. The method includes: firstly splitting dendrocalamus giganteus into bamboo segments that are 2cm-3cm long and have a width of less than 3cm to serve as the pulping raw materials; adding the pulping raw materials into a propylene glycol analytically pure reagent to conduct preimpregnation, and then performing separation to obtain an impregnated material; adding a pulping agent into the impregnated material, then putting the mixture into a chain oil bath cooking pan, and separating the slurry and the waste liquid at the end of cooking; washing the separated slurry and then subjecting the slurry to screening in a pulp screener to obtain clean dendrocalamus giganteus paper pulp; adding cold water into the waste liquid to carry out dilution standing and centrifugal separation, performing microfiltration with a microfiltration membrane, conducting ultrafiltration with an ultrafiltration membrane, implementing reduced pressure distillation to remove water, and then using the obtained solution to replace the propylene glycol analytically pure reagent to serve as the preimpregnation reagent. The paper pulp prepared by the method has the advantages of high yield, high viscosity, high whiteness and good strength.

Description

technical field [0001] The invention relates to a pulping method of bamboo pre-impregnated with propylene glycol organic solvent and belongs to the technical field of pulping. Background technique [0002] Dalong bamboo has an average fiber length of 2.72mm, an average width of 26.37μm, and an aspect ratio of 103.2. It is one of the bamboo species with the largest cultivation area, the widest range of uses, and the highest economic value in Yunnan Province. It has broad development and utilization prospects . [0003] Moreover, since the development of the pulp and paper industry, kraft pulping and caustic soda pulping have become the mainstream of the pulping industry, but the main disadvantages of this type of pulping are serious pollution and high investment costs. The purpose of organic solvent pulping is to replace the traditional pulping process and seek new methods to improve paper quality and output. At present, in the widely recognized organic solvent pulping meth...

Claims

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Application Information

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IPC IPC(8): D21C3/20D21H11/12
Inventor 何洁吴云进潘琦玮陈克利
Owner KUNMING UNIV OF SCI & TECH
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