CN102154887A - Method for producing high-whiteness bleached ramulus mori pulp by caustic soda-anthraquinone continuous stewing technology - Google Patents
Method for producing high-whiteness bleached ramulus mori pulp by caustic soda-anthraquinone continuous stewing technology Download PDFInfo
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Abstract
The invention provides a method for producing high-whiteness bleached ramulus mori pulp by a caustic soda-anthraquinone continuous stewing technology. The method comprises the steps of: treating the raw material ramulus mori, continuously stewing by a caustic soda-anthraquinone method, stewing coarse pulp and screening, washing, and bleaching by CEpH or DEpD or DEpDD technology to obtain the pulp. The treatment of the raw material comprises the steps of naturally cooling, oxidizing, cracking, slicing and washing, so that the influence of the epidermis and medulla cybrid cell to the paper quality is basically and thoroughly solved, and the problem of even stewing is solved; the traditional stewing ball is replaced by continuous stewing equipment for stewing, so that the energy of an unit product can be saved by more than 40%; the step of stewing can be performed without the sodium sulphide, and the step of stewing can be performed without peculiar smell such as the hydrogen sulfide and the like, so that the method is more environment-friendly; the pulping whiteness is more than 80%; and the method is stable for industrial production on a large scale.
Description
Technical field
The present invention relates to the pulp and paper technology field, specifically is to be the method for raw material employing caustic soda-anthraquinone continuous steaming-boiling technology, C EpH (or DEpD, DEpDD) bleaching process industrialized production with the full bar of ramulus mori.
Background technology
The existing ramulus mori total-bar slurry making technology of report is as follows at present:
1, cold soda pulping paper technology: it is to adopt caustic soda that material piece is flooded under the normal temperature and pressure, washs routinely behind the pulping etc., and dip time is long, is unfavorable for industrialized production.
2, chemical machinery sizing process: its handles back screening purification process through section, decatize, washing, squeezing, dipping, defibrination, because of it is a chemi-mechanical pulp, thereby can't effectively handles ramulus mori epidermis and marrow core heteroproteose cell and influences quality of finished paper.
3, sulfate pulping technology: use the rotary spherical digester boiling, digestion process has adopted akali sulphide, leaks as gas, and the existence of foul smell does not meet environmental protection requirement, and rotary spherical digester is decided to be obsolete product because of energy consumption is too high simultaneously.
4, ramulus mori material treatment process: have the report ramulus mori to tear into the humidification compacting storage of thread back through section.
Still do not have at present the industrialized production process (containing the thick pulp screen choosing of processing, boiling, boiling, washing, the bleaching of raw material) of environmental protection odorless flavor, the full bar soda pulping process of ramulus mori energy-conservation, high degree of bleaching, do not have the technical research report that adopts continuous steaming-boiling technology and C EpH (or DEpD, DEpDD) bleaching process industrialized production simultaneously yet.
Summary of the invention
The present invention research also provides a cover to adopt the environmental protection of continuous steaming-boiling technology and C EpH or DEpD, DEpDD bleaching process industrialized production technology not have the industrialized production process of stink, the full bar soda pulping process of ramulus mori energy-conservation, high degree of bleaching.
Mention in the literary composition:
C EpH bleaching process: be exactly to use the liquid chlorine chlorination earlier, alkali extracting then, and subsidy hydrogen peroxide add hypochlorite bleaching at last.
The DEpD bleaching process: be exactly to use chlorine dioxide as first section bleaching earlier, the chlorine dioxide post-bleach is used in alkali extracting then, and subsidy hydrogen peroxide at last again.
The DEpDD bleaching process: be exactly to use chlorine dioxide as first section bleaching earlier, alkali extracting then, and subsidy hydrogen peroxide are done second section bleaching with chlorine dioxide again, make tri-stage bleaching with chlorine dioxide more at last.
The technical solution used in the present invention is:
The raw material ramulus mori is handled, adopted soda-aq cooking continuously cooking, the thick pulp screen choosing of boiling, washing, uses C EpH or DEpD or the bleaching of DEpDD technology, get the finished product slurry.
Described raw material is handled and is meant the section specification standards: length 20 ± 5mm, thick 2-3mm, qualification rate 〉=80%, percentage of impurity≤5%.
The technological parameter of described soda-aq cooking continuously cooking: join alkali concn 145-155g/l, alkali charge 20%, digestion time 55min, digesting assistant consumption 0.3-0.5%.
Digesting assistant is the anthraquinone analog assistant.
Described C EpH bleaching process parameter: C section chlorine dosage 70%, Ep section alkali charge 4%, Ep section hydrogen peroxide consumption 1.5%, alkalization tower concentration 8-10%, tower pH10-13 is gone in alkalization, and tower pH9-11 alkalizes out, bleaching concentration 25-30g/L, H section chlorine dosage 30%, bleaching tower concentration 8-10%.
Described DEpD bleaching process parameter: D0 section chlorine dosage 65%, Ep section alkali charge 2%, Ep section hydrogen peroxide consumption 0.5%, alkalization tower concentration 8-10%, tower pH10-13, the tower pH9-11 that alkalizes out, D1 section chlorine dosage 35%, bleaching tower concentration 8-10% are gone in alkalization.
Described DEpDD bleaching process parameter: D0 section chlorine dosage 65%, Ep section alkali charge 2%, Ep section hydrogen peroxide consumption 0.5%, alkalization tower concentration 8-10%, tower pH10-13 is gone in alkalization, and tower pH9-11 alkalizes out, D1 section chlorine dosage 20%, D2 section chlorine dosage 15%, bleaching tower concentration 8-10%.
The technological process of ramulus mori total-bar slurry making is as follows:
Ramulus mori-fragmentation-section-belt conveyor-sieve-weigh-belt conveyor-drum-type washery slag machine-waterpower washery slag machine-helical feed dewaterer-pin drum meter-feeder-transverse tube type continuous-tube-spraying pot-vacuum pulp washing machine group-wash Hou Ta-double plate mill-screening-middle stock tank-pressurized screen-decker-sieve after-bay-chlorination tower-vacuum pulp washing machine-alkalization tower-vacuum pulp washing machine-bleaching tower-vacuum pulp washing machine-float rear storage tower-Double-screen filter press-finished pulp.
Concrete technical parameter and require as follows:
One, raw material purchase and preparation
1, during purchase ramulus mori raw material,, carries out insect protected, waterproof measure, deposit and reach more than three months, carry out successively sending boiling after fragmentation, section, screening, the washing according to 50 * 15 * 4.5 meters specification stackings.
2, raw material crushing
Raw material is through the disintegrating apparatus fragmentation, and section shape ramulus mori is lower than 5%.
3, raw material section
Slicing parameter: length 20 ± 5mm, thick 2-3mm.
4, material screening
Screening parameter: qualification rate 〉=80%, percentage of impurity≤5%.
5, raw material washing
Further epidermis and marrow heteroproteose cell are removed, allowed the abundant swollen of ramulus mori simultaneously, it is even to be beneficial to boiling.
Two, boiling
Ramulus mori after the washing enters continuous digesting apparatus and carries out boiling behind equipment such as dehydration, metering, feeding.
1, the feeding compression ratio 1: 2.5-2.7.
2, boiling control parameter:
| Digesting technoloy | Employing caustic soda-anthraquinone |
| Join alkali concn | 145-155g/l |
| Alkali charge | 20％ |
| Digesting assistant consumption (anthraquinone analog assistant) | 0.3-0.5％ |
| Steam parameter | ≥0.80MPa，200℃ |
| Cooking pressure, temperature | ≥0.65MPa，170℃ |
| Digestion time | 55min |
| The residual alkali of boiling | 10-15g/L |
| Boiling hardness | 13-15K |
Three, thick pulp screen choosing
Boiling is slightly starched through entering bleaching process after screening, the washing.
For making the thick pulp fibres length of ramulus mori even, use the suitable cut-off parts long fiber of grinding machine.
Four, bleaching control parameter
1, C EpH technology
| Bleaching process | C EpH technology |
| C section chlorine dosage | 70％ |
| Ep section alkali charge | 4％ |
| Ep section hydrogen peroxide consumption | 1.5％ |
| Alkalization tower concentration | 8-10％ |
| Residual alkali alkalizes | 0.6-1.2g/L |
| Tower pH is gone in alkalization | 10-13 |
| Tower pH alkalizes out | 9-11 |
| Bleaching concentration | 25-30g/L |
| H section chlorine dosage | 30％ |
| Bleaching tower concentration | 8-10％ |
2, DEpD technology
| Bleaching process | DEpD technology |
| D0 section chlorine dosage | 65％ |
| Ep section alkali charge | 2％ |
| Ep section hydrogen peroxide consumption | 0.5％ |
| Alkalization tower concentration | 8-10％ |
| Residual alkali alkalizes | 0.6-1.2g/L |
| Tower pH is gone in alkalization | 10-13 |
| Tower pH alkalizes out | 9-11 |
| D1 section chlorine dosage | 35％ |
| Bleaching tower concentration | 8-10％ |
3, DEpDD technology
| Bleaching process | DEpDD technology |
| D0 section chlorine dosage | 65％ |
| Ep section alkali charge | 2％ |
| Ep section hydrogen peroxide consumption | 0.5％ |
| Alkalization tower concentration | 8-10％ |
| Residual alkali alkalizes | 0.6-1.2g/L |
| Tower pH is gone in alkalization | 10-13 |
| Tower pH alkalizes out | 9-11 |
| D1 section chlorine dosage | 20％ |
| D2 section chlorine dosage | 15％ |
| Bleaching tower concentration | 8-10％ |
Ramulus mori slurry after the bleaching becomes finished product after compressing moisture content through mud jacking equipment.
Advantage of the present invention:
1, substantially thoroughly solves epidermis and marrow heteroproteose cell to the influence of quality of finished paper by natural air drying, oxidation, fragmentation, section, washing process during raw material is handled, solved the even problem of boiling.
2, the company's of utilization steaming equipment replaces traditional rotary spherical digester boiling, and unit product is energy-conservation to be reached more than 40%.
3, need not use akali sulphide in the boiling, digestion process does not have peculiar smell existence such as hydrogen sulfide, more environmental protection.
4, become pulp brightness to reach more than 80%, solved prior art and become pulp brightness to be lower than 75% problem.
5, be fit to industrialized production.
The specific embodiment
Below in conjunction with embodiment the present invention is described in detail.% is percetage by weight described in the literary composition.
Embodiment 1
Raw material: the raw material of this pilot scale--ramulus mori is Heng County, Guangxi local half a year of a living ramulus mori, the about 84400kg of ramulus mori quantity.
The production operation process: ramulus mori is through broken the cutting of slicer extrusion, screen out big specification ramulus mori sheet and mulberry powder marrow through waving again, be transported to pulping and digesting workshop section with automobile, through the drum-type rinsing machine, after the washing of waterpower rinsing maching, being transported to boiling four building spiral dewaters through the tablet pump dewaters, selling bulging meter measures, enter four tubular continuous digesters through scroll feeder again, through the High Temperature High Pressure boiling nearly one hour, spurt the 500m3 spraying pot behind the pulping, slurry is transported to slurrying the 3rd buildings and washs, and adopts pressurized screen to screen, good slurry is delivered to bleachery, adopts the CEpH bleaching process; The extraction black liquor send between the alkali recovery vehicle to be handled; The slurrying middle-stage wastewater send Sewage Disposal to handle.
The apparatus adaptability transformation of ramulus mori slurry production: increase by a cover ramulus mori feed preparing device (contain chipping machine, wave sieve, belt conveyor etc.), transform one of the feeding serew, transformation waterpower washery slag machine sieve plate one cover that are fit to ramulus mori characteristic compression ratio
The implementation case manufacturing parameter condition is as follows:
Boiling control parameter:
| Digesting technoloy | Adopt caustic soda-aq method |
| Join alkali concn | 145-155g/l |
| Alkali charge (caustic soda) | 20% (percentage of raw material weight relatively) |
| Digesting assistant consumption (anthraquinone CT-3) | 0.3% (raw material weight ratio relatively) |
| Steam parameter | ≥0.80MPa，200℃ |
| Cooking pressure, temperature | ≥0.65MPa，170℃ |
| Digestion time | 55min |
| The residual alkali of boiling | 10-15g/L |
| Boiling hardness | 13-15K |
Adopt C EpH technological parameter:
| Bleaching process | C EpH technology |
| C section chlorine dosage (chlorine) | 54kg |
| Ep section alkali charge (caustic soda) | 40kg |
| Ep section hydrogen peroxide consumption | 16kg |
| Alkalization tower concentration | 8-10％ |
| Residual alkali alkalizes | 0.6-1.2g/L |
| Tower pH is gone in alkalization | 10-13 |
| Tower pH alkalizes out | 9-11 |
| Bleaching concentration | 25-30g/L |
| H section chlorine dosage | 27kg |
| Bleaching tower concentration | 8-10％ |
The result of the test that adopts the CEpH bleaching process to obtain is as follows:
Table 1 cooking characteristic index
Table 2 bleachability index
Illustrate:
BOD (Biochemical Oxygen Demand writes a Chinese character in simplified form): biochemical oxygen demand (BOD) or bod.One of aerobic pollution matter content such as organic matter comprehensive indication in the expression water.Organic matter is owing to the biochemical action of microorganism carries out in its explanation water.
Oxidation Decomposition, the total quantity of the oxygen in water that consumes when making it inorganicization or aerification.The ppm of its unit becomes mg/litre (mg/L) expression.Organic pollution materials is many more in the high more explanation water of its value, pollutes also just serious more.
COD (Chemical Oxygen Demand writes a Chinese character in simplified form): COD.Be under certain conditions, when adopting certain strong oxidizer to handle water sample, the oxidant content that is consumed.It is what a index of reducing substances in the expression water.Reducing substances in the water has various organic matters, nitrite, sulfide, ferrous salt etc.But main is organic matter.Therefore, COD (COD) is again often as weighing what index of organic matter content in the water.COD is big more, illustrates that water body is subjected to organic pollution serious more.
Embodiment 2
Raw material: the raw material of this pilot scale--ramulus mori is Heng County, Guangxi local half a year of a living ramulus mori, the about 47300kg of ramulus mori quantity.
The production operation process: ramulus mori is through broken the cutting of slicer extrusion, screen out big specification ramulus mori sheet and mulberry powder marrow through waving again, be transported to pulping and digesting with automobile, through the drum-type rinsing machine, after the washing of waterpower rinsing maching, being transported to boiling four building spiral dewaters through the tablet pump dewaters, selling bulging meter measures, enter four tubular continuous digesters through scroll feeder again, through the High Temperature High Pressure boiling nearly one hour, spurt the 500m3 spraying pot behind the pulping, slurry is transported to slurrying the 3rd buildings and washs, and adopts pressurized screen to screen, good slurry is delivered to bleachery, adopts the DEpD bleaching process; The extraction black liquor send between the alkali recovery vehicle to be handled; The slurrying middle-stage wastewater send Sewage Disposal to handle.
The apparatus adaptability transformation of ramulus mori slurry production: increase by a cover ramulus mori feed preparing device (contain chipping machine, wave sieve, belt conveyor etc.), transform one of the feeding serew, transformation waterpower washery slag machine sieve plate one cover that are fit to ramulus mori characteristic compression ratio.
The implementation case manufacturing parameter condition is as follows:
Boiling control parameter:
| Digesting technoloy | Adopt caustic soda-aq method |
| Join alkali concn | 145-155g/l |
| Alkali charge | 20% (percentage of raw material weight relatively) |
| Digesting assistant consumption (anthraquinone CT-3) | 0.3% (raw material weight ratio relatively) |
| Steam parameter | ≥0.80MPa，200℃ |
| Cooking pressure, temperature | ≥0.65MPa，170℃ |
| Digestion time | 55min |
| The residual alkali of boiling | 10-15g/L |
| Boiling hardness | 13-15K |
Adopt the DEpD technological parameter:
| Bleaching process | DEpD technology |
| D0 section chlorine dosage | 62kg (total available chlorine is 9.5%, and wherein this section accounts for 65%) |
| Ep section alkali charge | 26kg |
| Ep section hydrogen peroxide consumption | 45kg |
| Alkalization tower concentration | 8-10％ |
| Residual alkali alkalizes | 0.6-1.2g/L |
| Tower pH is gone in alkalization | 10-13 |
| Tower pH alkalizes out | 9-11 |
| D1 section chlorine dosage | 33kg |
| Bleaching tower concentration | 8-10％ |
Carry out the processing of ramulus mori raw material, boiling, thick pulp screen choosing according to technique scheme, adopt the DEpD bleaching process, the result of the test that obtains is as follows:
Table 1 cooking characteristic index
Table 2 bleachability index
| Bleaching process | Total available chlorine % | Whiteness %ISO | Yield % | CODkg/ ton slurry | BOD 5Kg/ ton slurry |
| DEpD | 7.0 | 80.14 | 94.95 | 77.65 | 33.65 |
Embodiment 3
Raw material: the raw material of this pilot scale--ramulus mori is Heng County, Guangxi local half a year of a living ramulus mori, the about 35600kg of ramulus mori quantity.
The production operation process: ramulus mori is through broken the cutting of slicer extrusion, screen out big specification ramulus mori sheet and mulberry powder marrow through waving again, be transported to pulping and digesting with automobile, through the drum-type rinsing machine, after the washing of waterpower rinsing maching, being transported to boiling four building spiral dewaters through the tablet pump dewaters, selling bulging meter measures, enter four tubular continuous digesters through scroll feeder again, through the High Temperature High Pressure boiling nearly one hour, spurt the 500m3 spraying pot behind the pulping, slurry is transported to slurrying the 3rd buildings and washs, and adopts pressurized screen to screen, good slurry is delivered to bleachery, adopts the DEpDD bleaching process; The extraction black liquor send between the alkali recovery vehicle to be handled; The slurrying middle-stage wastewater send Sewage Disposal to handle.
The apparatus adaptability transformation of ramulus mori slurry production: increase by a cover ramulus mori feed preparing device (contain chipping machine, wave sieve, belt conveyor etc.), transform one of the feeding serew, transformation waterpower washery slag machine sieve plate one cover that are fit to ramulus mori characteristic compression ratio.
The implementation case manufacturing parameter condition is as follows:
Boiling control parameter:
| Digesting technoloy | Adopt caustic soda-aq method |
| Join alkali concn | 145-155g/l |
| Alkali charge | 20% (percentage of raw material weight relatively) |
| Digesting assistant consumption (anthraquinone CT-1) | 0.3-0.5% (percentage of raw material weight relatively) |
| Steam parameter | ≥0.80MPa，200℃ |
| Cooking pressure, temperature | ≥0.65MPa，170℃ |
| Digestion time | 55min |
| The residual alkali of boiling | 10-15g/L |
| Boiling hardness | 13-15K |
Adopt the DEpDD technological parameter:
| Bleaching process | DEpDD technology |
| D0 section chlorine dosage | 65kg |
| Ep section alkali charge | 25kg |
| Ep section hydrogen peroxide consumption | 50kg |
| Alkalization tower concentration | 8-10％ |
| Residual alkali alkalizes | 0.6-1.2g/L |
| Tower pH is gone in alkalization | 10-13 |
| Tower pH alkalizes out | 9-11 |
| D1 section chlorine dosage | 20kg |
| D2 section chlorine dosage | 15kg |
| Bleaching tower concentration | 8-10％ |
Carry out the processing of ramulus mori raw material, boiling, thick pulp screen choosing according to technique scheme, adopt the DEpDD bleaching process, the result of the test that obtains is as follows:
Table 1 cooking characteristic index
Table 2 bleachability index
| Bleaching process | Total available chlorine % | Whiteness %ISO | Yield % | CODkg/ ton slurry | BOD 5Kg/ ton slurry |
| DEpDD | 7.0 | 82.65 | 95.17 | 77.08 | 31.36 |
Comprehensive above three embodiment carry out the full bar soda pulping process of ramulus mori, boiling unscreened yield about 49% according to technical solution of the present invention, bleaching screened yield about 46%, whiteness is higher than 80%ISO, and slurrying middle-stage wastewater BC ratio is greater than 40%, and the treatment process of available biochemistry+materialization is handled up to standard; Utilize advanced energy-conservation digesting apparatus simultaneously, in big the production than traditional rotary spherical digester cooking energy conservation more than 40%, and in the boiling without akali sulphide, do not produce foul smell, reduced the generation of the phenomenon that disturbs residents.
Technological parameter provided by the invention, technological process are fit to industrialized production and use.
Claims (8)
1. one kind is adopted the caustic soda-anthraquinone method continuous steaming-boiling technology to produce the method that high whiteness bleaching ramulus mori is starched, it is characterized in that: the raw material ramulus mori is handled, adopted soda-aq cooking continuously cooking, the thick pulp screen choosing of boiling, washing, uses C EpH or DEpD or the bleaching of DEpDD technology, get the finished product slurry.
2. caustic soda-anthraquinone method continuous steaming-boiling technology according to claim 1 is produced the method for high whiteness bleaching ramulus mori slurry, it is characterized in that: raw material is handled and is meant the section specification standards: length 20 ± 5mm, thick 2-3mm, qualification rate 〉=80%, percentage of impurity≤5%.
3. caustic soda-anthraquinone method continuous steaming-boiling technology according to claim 1 is produced the method for high whiteness bleaching ramulus mori slurry, the technological parameter that it is characterized in that described soda-aq cooking continuously cooking: join alkali concn 145-155g/l, alkali charge 20%, digestion time 55min, digesting assistant consumption 0.3-0.5%.
4. caustic soda-anthraquinone method continuous steaming-boiling technology according to claim 3 is produced the method for high whiteness bleaching ramulus mori slurry, and it is characterized in that: digesting assistant is the anthraquinone analog assistant.
5. caustic soda-anthraquinone method continuous steaming-boiling technology according to claim 1 is produced the method for high whiteness bleaching ramulus mori slurry, it is characterized in that described C EpH bleaching process parameter: C section chlorine dosage 70%, Ep section alkali charge 4%, Ep section hydrogen peroxide consumption 1.5%, alkalization tower concentration 8-10%, tower pH10-13 is gone in alkalization, tower pH9-11 alkalizes out, bleaching concentration 25-30g/L, H section chlorine dosage 30%, bleaching tower concentration 8-10%.
6. caustic soda-anthraquinone method continuous steaming-boiling technology according to claim 1 is produced the method for high whiteness bleaching ramulus mori slurry, it is characterized in that described DEpD bleaching process parameter: D0 section chlorine dosage 65%, Ep section alkali charge 2%, Ep section hydrogen peroxide consumption 0.5%, alkalization tower concentration 8-10%, tower pH10-13 is gone in alkalization, and tower pH9-11 alkalizes out, D1 section chlorine dosage 35%, bleaching tower concentration 8-10%.
7. caustic soda-anthraquinone method continuous steaming-boiling technology according to claim 1 is produced the method for high whiteness bleaching ramulus mori slurry, it is characterized in that described DEpDD bleaching process parameter: D0 section chlorine dosage 65%, Ep section alkali charge 2%, Ep section hydrogen peroxide consumption 0.5%, alkalization tower concentration 8-10%, tower pH10-13 is gone in alkalization, tower pH9-11 alkalizes out, D1 section chlorine dosage 20%, D2 section chlorine dosage 15%, bleaching tower concentration 8-10%.
8. the method for producing high-whiteness bleached ramulus mori pulp by caustic soda-anthraquinone continuous stewing technology according to claim 1 is characterized in that technological process is: ramulus mori-fragmentation-section-belt conveyor-sieve-weigh-belt conveyor-drum-type washery slag machine-waterpower washery slag machine-helical feed dewaterer-pin drum meter-feeder-transverse tube type continuous-tube-spraying pot-vacuum pulp washing machine group-wash Hou Ta-double plate mill-screening-middle stock tank-pressurized screen-decker-sieve after-bay-chlorination tower-vacuum pulp washing machine-alkalization tower-vacuum pulp washing machine-bleaching tower-vacuum pulp washing machine-float rear storage tower-Double-screen filter press-finished pulp.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104391078A (en) * | 2014-09-23 | 2015-03-04 | 王朝辉 | Method for rapidly evaluating poplar soda-AQ pulping process |
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Application publication date: 20110817 |