CN100441773C - Method of ultrasound in use for producing purified pulp - Google Patents

Method of ultrasound in use for producing purified pulp Download PDF

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Publication number
CN100441773C
CN100441773C CNB2006101236642A CN200610123664A CN100441773C CN 100441773 C CN100441773 C CN 100441773C CN B2006101236642 A CNB2006101236642 A CN B2006101236642A CN 200610123664 A CN200610123664 A CN 200610123664A CN 100441773 C CN100441773 C CN 100441773C
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sonicated
minute
raw material
frequency
power density
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CN1958942A (en
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叶君
熊犍
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The present invention relates to a method for producing refined size mixture by using ultrasonic technique. Said method includes the following steps: preparing raw materials, removing impurity, opening and adding NaOH aqueous solution, heating, cooking, making ultrasonic treatment, centrifugal separating, and ultrasonic treatment and bleaching, dewatering and drying so as to obtain the invented product.

Description

The ultrasonic method that is used to produce refined stock
Technical field
The present invention relates to a kind of technical field of producing of refined stock, specifically relate to a kind of ultrasonic method that is used to produce refined stock.
Background technology
Cellulose is one of the most ancient natural polymer.It is present in the cell of plant, mainly derives from timber, bagasse, bamboo, cotton.The advantage of cellulose maximum is that it is reproducible, and is biodegradable, but biocompatible and derivatization.
Cellulose and derivative thereof are used and are related to many industrial departments, as weaving, and light industry, chemical industry, national defence, oil, medicine, biotechnology, departments such as the environmental protection and the energy have great importance to development and national economy.
Natural plant raw material is through boiling, and the processing of bleaching to main process obtains refined stock (raw material that content of cellulose is high).Refined stock has: 1) removed in the vegetable material various impurity such as hemicellulose, lignin, ash content, grease, wax; 2) improve the respond of starching (cellulose) as far as possible; 3) suitable cellulosic degree of polymerization and degree of polymerization distribution.
The quality of refined stock directly influences the quality of various cellulose derivatives.Iso standard adopts S 10, S 18, and S 10-S 18Characterize the quality of refined stock; S 10, S 18, and S 10-S 18Be worth more for a short time, the quality of refined stock is high more.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, the ultrasonic method that is used to produce refined stock that a kind of cost is low, the quality of efficient high product is high is provided.
The ultrasonic method that is used to produce refined stock of the present invention comprises the steps:
The first step is with the NaOH aqueous solution of pretreated raw material adding 10～22%, and the NaOH aqueous solution and raw material amount ratio are the 2-4 liter: 1 kilogram;
The second step sonicated 0.1～15 minute, the sonicated frequency is 15～104kHz, power density is 0.1～1.5kW/m 3The intensification boiling; 150-170 ℃ is incubated 1-6 hour; Heat up and holding stage sonicated intermittently, each 0.1～5 minute; Not at this parameter area, wayward temperature causes chemical degradation.
The solid bleach that second step of the 3rd step obtains, sonicated 0.1～15 minute, sonicated frequency are 15～104kHz, power density is 0.1～1.5kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
Second goes on foot sonicated at 5-10 minute described intermittence.
Described raw material is general is used to extract cellulosic raw material, plant that the optimum fiber cellulose content is high such as timber, bagasse, bamboo, cotton (suede) or reed etc.;
Preliminary treatment is meant carries out shredding, dedusting and mechanical admixture with raw material.
The solid bleach that obtains comprises chlorination, alkali treatment, bleaching agent bleaching, acid treatment four-stage; The general clorox of bleaching agent, or chlorine dioxide, hydrogen peroxide;
The quality that is applicable to raw material of the present invention with batch, and the stable quality to final products of technology produces considerable influence.
The sonicated technology that the present invention adopts is to utilize the ultrasonic turbulence effect that has, perturbation effect, interfacial effect, Mohaupt effect, and making does not need solution is carried out heat treated.
The present invention compared with prior art has following advantage:
1 obtain batch between the high refined stock of steady quality, quality;
2 because use sonicated technology is energy-conservation, saves time;
3 equipment cleaning and simple, convenient.
The specific embodiment
Embodiment 1
The first step is got one-level velveteen 40.0g, adds 80.0g, 10.0% the NaOH aqueous solution;
The second step sonicated 0.1 minute, the sonicated frequency is 15kHz, power density is 0.1kW/m 3Heat up; 170 ℃ are incubated 6 hours; Heat up and holding stage, 15 minutes per intermittences, sonicated once, each 0.1 minute;
The solid that second step of the 3rd step obtains is transferred pH2, adds chlorine 0.2g, and pH10 adds the 3.0g clorox, bleached 1 hour, temperature 35-40 ℃, at 10 minutes per intermittences, sonicated once, each 0.1 minute, the sonicated frequency was 25kHz, and power density is 0.8kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
Obtain S 10=1.34, S 18=1.16, S 10-S 18=0.18, special excellent product; Do not adopt under the ultrasonic similarity condition, obtain S 10=4.42, S 18=2.81, S 10-S 18=1.61 quality product.
Embodiment 2
The first step is got secondary cotton linter 40.0g, adds 160.0g, 22.0% the NaOH aqueous solution;
The second step sonicated 15 minutes, the sonicated frequency is 75kHz, power density is 1.5kW/m 3Heat up; 150 ℃ are incubated 1 hour; Heat up and holding stage, 15 minutes per intermittences, sonicated once, each 0.5 minute;
The solid that second step of the 3rd step obtains is transferred pH2, adds chlorine 0.2g, and pH10 adds the 3.0g clorox, bleached 1 hour, temperature 35-40 ℃, at 10 minutes per intermittences, sonicated once, each 0.5 minute, the sonicated frequency was 25kHz, and power density is 0.8kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
Obtain S 10=4.30, S 18=2.35, S 10-S 18=1.95, quality product; Do not adopt under the ultrasonic similarity condition, obtain S 10=5.21, S 18=2.81, S 10-S 18=2.40 product.
Embodiment 3
The first step is got leaf wood 40.0g, adds 160.0g, 20.0% the NaOH aqueous solution;
The second step sonicated 3 minutes, the sonicated frequency is 25kHz, power density is 0.8kW/m 3Heat up; 170 ℃ are incubated 4 hours; Heat up and holding stage, 15 minutes per intermittences, sonicated once, each 0.5 minute;
The solid that second step of the 3rd step obtains is transferred pH2, adds chlorine 0.2g, and pH10 adds the 3.0g clorox, bleached 1.5 hours, temperature 35-40 ℃, at 10 minutes per intermittences, sonicated once, each 0.5 minute, the sonicated frequency was 25kHz, and power density is 0.8kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
Obtain S 10=5.35, S 18=3.35, S 10-S 18=2.00, quality product; Do not adopt under the ultrasonic similarity condition, obtain S 10=7.21, S 18=4.81, S 10-S 18=2.40 product.
Embodiment 4
The first step is got bamboo 40.0g, adds 160.0g, 18.0% the NaOH aqueous solution;
The second step sonicated 5 minutes, the sonicated frequency is 104kHz, power density is 0.2kW/m 3Heat up; 170 ℃ are incubated 4 hours; Heat up and holding stage, 15 minutes per intermittences, sonicated once, each 0.5 minute;
The solid that second step of the 3rd step obtains is transferred pH2, adds chlorine 0.2g, and pH10 adds the 3.0g clorox, bleached 1.5 hours, temperature 35-40 ℃, at 10 minutes per intermittences, sonicated once, each 0.5 minute, the sonicated frequency was 25kHz, and power density is 0.8kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
Obtain S 10=5.40, S 18=3.40, S 10-S 18=2.00, quality product; Do not adopt under the ultrasonic similarity condition, obtain S 10=7.80, S 18=5.40, S 10-S 18=2.40 product.
Embodiment 5
The first step is got reed 40.0g, adds 160.0g, 18.0% the NaOH aqueous solution;
The second step sonicated 3 minutes, the sonicated frequency is 25kHz, power density is 0.8kW/m 3Heat up; 170 ℃ are incubated 4 hours; Heat up and holding stage, 15 minutes per intermittences, sonicated once, each 0.5 minute;
The solid that second step of the 3rd step obtains is transferred pH2, adds chlorine 0.2g, and pH10 adds the 3.0g clorox, bleached 1.5 hours, temperature 35-40 ℃, at 10 minutes per intermittences, sonicated once, each 0.5 minute, the sonicated frequency was 25kHz, and power density is 0.8kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
Obtain S 10=5.80, S 18=3.40, S 10-S 18=2.40, quality product; Do not adopt under the ultrasonic similarity condition, obtain S 10=9.70, S 18=6.10, S 10-S 18=3.60 product.

Claims (3)

1, a kind of ultrasonic method that is used to produce refined stock is characterized in that comprising the steps:
The first step is with the NaOH aqueous solution of pretreated raw material adding 10～22%, and the NaOH aqueous solution and raw material amount ratio are the 2-4 liter: 1 kilogram;
The second step sonicated 0.1～15 minute, the sonicated frequency is 15～104kHz, power density is 0.1～1.5kW/m 3The intensification boiling; 150-170 ℃ is incubated 1-6 hour; Heat up and holding stage sonicated intermittently, each 0.1～5 minute;
The solid bleach that second step of the 3rd step obtains, sonicated 0.1～15 minute, sonicated frequency are 15～104kHz, power density is 0.1～1.5kW/m 3
The 4th the step the 3rd the step obtain solid dehydration, dry product.
2, method according to claim 1 is characterized in that second goes on foot sonicated at 5-10 minute described intermittence.
3, method according to claim 1 and 2 is characterized in that described raw material adopts timber, bagasse, bamboo, cotton or reed.
CNB2006101236642A 2006-11-21 2006-11-21 Method of ultrasound in use for producing purified pulp Expired - Fee Related CN100441773C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781862B (en) * 2009-12-09 2011-02-23 刘洁 Process for integrating pulping and bleaching by using ultrasonic wave
CN108301246B (en) * 2017-12-31 2019-02-26 东莞市泰昌纸业有限公司 Long fibre is reduced during using the defibrination of regenerated papermaking to fracture the method for rate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1577664A (en) * 1977-05-10 1980-10-29 Mitsubishi Corp Process for preparing paper from lauan pulp
WO1990005208A1 (en) * 1988-11-10 1990-05-17 Sven Ljungbo Process for reducing the consumption of energy during the mechanical production of paper pulp
DE19524404A1 (en) * 1995-07-04 1997-01-09 Ecco Gleittechnik Gmbh Pulp-making process using ultra-sonic energy - to reduce impregnation time by third and to reduce temp. required for subsequent treatment by 10% or treatment time by third.
JP2004076215A (en) * 2002-08-20 2004-03-11 Kurita Water Ind Ltd Method for preventing scale formation in paper-pulp manufacturing process
WO2006053939A1 (en) * 2004-11-16 2006-05-26 Nanolab Systems Oy Improved methods and devices for the fabrication of cellulose

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1577664A (en) * 1977-05-10 1980-10-29 Mitsubishi Corp Process for preparing paper from lauan pulp
WO1990005208A1 (en) * 1988-11-10 1990-05-17 Sven Ljungbo Process for reducing the consumption of energy during the mechanical production of paper pulp
DE19524404A1 (en) * 1995-07-04 1997-01-09 Ecco Gleittechnik Gmbh Pulp-making process using ultra-sonic energy - to reduce impregnation time by third and to reduce temp. required for subsequent treatment by 10% or treatment time by third.
JP2004076215A (en) * 2002-08-20 2004-03-11 Kurita Water Ind Ltd Method for preventing scale formation in paper-pulp manufacturing process
WO2006053939A1 (en) * 2004-11-16 2006-05-26 Nanolab Systems Oy Improved methods and devices for the fabrication of cellulose

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