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Poplar ultrasonic chemical mechanical pulping technique

A chemical mechanical and ultrasonic technology, applied in multi-stage pulping process, pulping with organic compounds, pulping with cellulose raw materials, etc., can solve the problem of reducing the physical strength of poplar high-yield pulp and the quality of paper products, and restricting poplar high-yield pulp. Production and application range, high lignin content, to achieve the effect of improving physical properties and optical properties, reducing environmental pollution and production cost pressure, and increasing permeability

Active Publication Date: 2016-11-16
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Poplar belongs to the deciduous trees of Salicaceae. It is tall and straight, grows fast, has strong adaptability, contains more cellulose and hemicellulose, has shorter fibers, and has high lignin content, which affects the chemical and mechanical properties of poplar to a certain extent. Pulping performance reduces the physical strength of high-yield poplar pulp and the quality of paper products, and limits the production and application range of high-yield poplar pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Three-year-old poplar wood chips are pulped according to the following steps after steaming the first stage of extrusion and decompression:

[0033](1) Ultrasonic pretreatment, the ultrasonic treatment instrument is JY-98ⅢN, the pretreatment conditions are: slurry concentration 3%, temperature 40-60°C, time 10min, ultrasonic power 120W;

[0034] (2) Xylanase pretreatment, the enzyme used is solid xylanase ZX-SP002, the pretreatment conditions are: temperature 40-60°C, time 30min, pH value 5-6, enzyme dosage 10IU / g dry pulp , pulp concentration 10%;

[0035] (3) Carry out the first stage of chemical pre-impregnation with the slurry treated in the above step (2) with sodium-alkali hydrogen peroxide solution. With respect to the quality of the dry pulp, the amount and process conditions of each chemical component in the impregnation solution are: NaOH 2.0%, H 2 o 2 2.5%, MgSO 4 0.15%, EDTA 0.15%, impregnation temperature 50-60℃, solid-liquid ratio 1:4;

[0036] (4) ...

Embodiment 2

[0044] Three-year-old poplar wood chips are pulped according to the following steps after steaming the first stage of extrusion and decompression:

[0045] (1) Ultrasonic pretreatment, the ultrasonic treatment instrument is JY-98ⅢN, the pretreatment conditions are: slurry concentration 3%, temperature 40-60°C, time 20min, ultrasonic power 120W;

[0046] (2) Xylanase pretreatment, the enzyme used is solid xylanase ZX-SP002, the pretreatment conditions are: temperature 40-60°C, time 30min, pH value 5-6, enzyme dosage 20IU / g dry pulp , pulp concentration 10%;

[0047] (3) Carry out the first stage of chemical pre-impregnation with the slurry treated in the above step (2) with sodium-alkali hydrogen peroxide solution. With respect to the quality of the dry pulp, the amount and process conditions of each chemical component in the impregnation solution are: NaOH 2.5%, H 2 o 2 2.9%, MgSO 4 0.15%, EDTA 0.15%, impregnation temperature 50-60℃, solid-liquid ratio 1:4;

[0048] (4)...

Embodiment 3

[0056] Three-year-old poplar wood chips are pulped according to the following steps after steaming the first stage of extrusion and decompression:

[0057] (1) Ultrasonic pretreatment, the ultrasonic treatment instrument is JY-98ⅢN, the pretreatment conditions are: slurry concentration 3%, temperature 40-60°C, time 30min, ultrasonic power 120W;

[0058] (2) Xylanase pretreatment, the enzyme used is solid xylanase ZX-SP002, the pretreatment conditions are: temperature 40-60°C, time 30min, pH value 5-6, enzyme dosage 30IU / g dry pulp , pulp concentration 10%;

[0059] (3) Carry out the first stage of chemical pre-impregnation with the slurry treated in the above step (2) with sodium-alkali hydrogen peroxide solution. With respect to the quality of the dry pulp, the amount and process conditions of each chemical component in the impregnation solution are: NaOH 2.8%, H 2 o 2 2.8%, MgSO 4 0.15%, EDTA 0.15%, impregnation temperature 50-60℃, solid-liquid ratio 1:4;

[0060] (4)...

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Abstract

The invention relates to a poplar ultrasonic chemical mechanical pulping technique. The pulping technique includes the steps: performing ultrasonic pretreatment on steamed poplar pulp after first stage impressafining; performing xylanase pretreatment on the pulp after the ultrasonic pretreatment; soaking the pulp in soda hydrogen dioxide solution after pretreatment; performing second stage impressafining after soaking; performing second stage soaking on the pulp in the soda hydrogen dioxide solution after the second stage impressafining; performing first stage refining on the pulp with the soaking liquid; performing high concentrated storage and bleaching after the first stage refining; and performing second stage refining to obtain high-brightness high-yield high-strength chemical mechanical pulp. The poplar ultrasonic chemical mechanical pulping technique can improve the mechanical pulping performance of fast-growing poplar, enlarge the application range of poplar high-yield pulp, improve the performance of poplar paper pulp, and improve the use value of the poplar.

Description

technical field [0001] The invention relates to a chemical-mechanical pulping process, in particular to a chemical-mechanical pulping process for poplar wood with ultrasonic wave and enzyme pretreatment. Background technique [0002] The pulp and paper industry has always occupied an important position in the global industrial manufacturing industry. It is one of the important basic raw material industries of the national economy. The production and consumption level of paper and cardboard has become an important symbol to measure a country's economic development level and social progress. At present, the world's paper industry is mainly based on wood resources, and the proportion of wood fiber raw materials in papermaking raw materials has reached 94%. With the development of the world economy and the continuous improvement of people's living standards, the people's requirements for the quality of paper and cardboard are getting higher and higher, while the utilization rate...

Claims

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Application Information

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IPC IPC(8): D21B1/30D21C3/00D21C3/26D21B1/02
CPCD21B1/02D21B1/021D21B1/30D21C3/003D21C3/26
Inventor 杨桂花蒋启蒙王强吉兴香陈嘉川
Owner QILU UNIV OF TECH
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