CN102535217A - Improved new bleached chemithermomechanical pulp (BCTMP) process - Google Patents
Improved new bleached chemithermomechanical pulp (BCTMP) process Download PDFInfo
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- CN102535217A CN102535217A CN2012100643755A CN201210064375A CN102535217A CN 102535217 A CN102535217 A CN 102535217A CN 2012100643755 A CN2012100643755 A CN 2012100643755A CN 201210064375 A CN201210064375 A CN 201210064375A CN 102535217 A CN102535217 A CN 102535217A
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Abstract
The invention relates to an improved new bleached chemithermomechanical pulp (BCTMP) making process, which is characterized in that: three or four serially-connected double-screw pulp extruders are additionally arranged behind a bleaching tower in the traditional BCTMP process and used for extracting bleaching waste liquid; the total extraction rate of the waste liquid is 80 to 95 percent; water consumption is low in the extraction process; the solid content of the extracted waste liquid is high and is 4.0 to 6.0 percent; and the extracted waste liquid is subjected to alkali recovery treatment, so that steam consumption in the alkali recovery and concentration processes of the waste liquid can be reduced, and the negative influence of anionic trash in pulp on a wet part of a paper machine on a papermaking section is reduced.
Description
One, technical field:
The present invention relates to a kind of improved BCTMP slurrying new technological process.
Two, background technology:
BCTMP is one of classical slurrying flow process in the chemi-mechanical pulp, and the BCTMP pulping process flow is: length 15～20mm, thickness 3～5mm, width are removed silt less than the wood chip of 10mm through water washing; Wood chip washing back uses the inclined screw Water Extraction Machinery to make the wood chip mass dryness fraction reach 30～40%; Utilizing compression ratio is that 1: 4.0～1: 6.0 extruding and tearing machine is squeezed into the wood wool shape with wood chip; To push back wood chip pre-preg, the dipping medicine is DTPA and sodium sulfite, gets into reaction warehouse reaction 30min; In preheater, carry out preheating with steam; Under 35～40% concentration, carry out high consistency refining one time; Diluted concentration to 4～5% gets into the latent pond that disappears; Low dense defibrination under 3～4% concentration; Three sections screenings under 2～4% concentration; Process polydisc wash engine filtering stock under 1～2% concentration; The washing disposed slurry uses two roller Water Extraction Machinerys to dewater and is concentrated into 30～35% concentration; In the dense blender of height, mix with the alkaline hydrogen peroxide that contains DTPA; React 1.5～2.0h in the bleaching tower, bleaching concentration is 30～35%; It is subsequent use to add plain boiled water adjusting concentration to 4.5～10%.
Use hydrogen peroxide as bleaching agent in the bleaching tower, alkaline hydrogen peroxide bleaching is the bleaching that keeps lignin, is accompanied by bleaching process and can produces bleaching waste liquor.The oxidation lignin and the polygalacturonic acid that contain hydrogen peroxide and lignin, pectin reaction generation in the waste liquid; And disperse in defibrination and the bleaching process or anionic trash such as the resin acid of stripping and aliphatic acid colloid; These anionic trashes are trapped in the slurry, and these electronegative polygalacturonic acids, the dispersion micelle of lignin macromolecule and extract can get into slurry and copy paper system; Can in the white-water system of paper machine, accumulate; Reduce the effect of retention and drainage aid agent, increase the consumption of wet end system anionic trash trapping agent, operation brings unstability to wet end.
Three, summary of the invention:
The present invention provides a kind of improved BCTMP new technological process; Can 80%～95% bleaching waste liquor that produce in the bleaching tower be extracted and send the alkali recycling; The leaching process water consumption is few, and the waste liquid solid content that extracts is high, 4.0%～6.0%; Can reduce waste liquid alkali and reclaim the steam consumption in the concentration process, can reduce anionic trash again at the negatively influencing of machine hand's section to wet end of machine.
Specific embodiments is following:
1, wood chip washing: length 15～20mm, thickness 3～5mm, width are removed silt less than the wood chip of 10mm through water washing;
2, wood chip dehydration: use the inclined screw Water Extraction Machinery to make the wood chip mass dryness fraction reach 30～40%;
3, extruding and tearing: utilizing compression ratio is that 1: 4.0～1: 6.0 extruding and tearing machine is squeezed into the wood wool shape with wood chip;
4, pre-preg: will push the back wood chip and impregnated in the sodium sulfite solution that contains DTPA, and get into reaction warehouse reaction 30min;
5, preheating: in preheater, carry out preheating with steam;
6, high consistency refining: under 35～40% concentration, carry out high consistency refining one time;
7, disappear latent: mill back slurry diluted concentration to 4～5% disappears latent;
8, low dense defibrination: the disposed slurry low dense defibrination under 3～4% concentration of diving disappears;
9, screening: three sections screenings under 2～4% concentration;
10, washing: the screening disposed slurry under 1～2% concentration through the washing of polydisc wash engine, the washing back use two roller Water Extraction Machinerys dewater to concentration be 30～35%;
11, high dense blender: mix with the alkaline hydrogen peroxide that contains DTPA;
12, bleaching tower: in bleaching tower, react 1.5～2.0h, bleaching concentration is 30～35%;
13, three or four series connection Double screw pulp extruders extraction waste liquids: bleaching back slurry uses the Double screw pulp extruder extraction waste liquid of three or four series connection; The inlet concentration of every Double screw pulp extruder is 15%～25%; Exit concentration adds clear water 35%～40% from last, and the total recovery rate of waste liquid is 80～95%; The waste liquid solid content that extracts is 4.0～6.0%, and waste liquid send the alkali recycling;
14, the storage slurry is subsequent use: it is subsequent use that adding plain boiled water is regulated concentration to 4.5～10%.
Four, description of drawings
Fig. 1, Fig. 2 are improved BCTMP technology new technological process sketch.
Five, the specific embodiment
Embodiment one: the improved BCTMP technology of the present invention new technological process combines Fig. 1 to explain as follows:
1, wood chip washing: length 15～20mm, thickness 3～5mm, width are removed silt less than the wood chip of 10mm through water washing;
2, wood chip dehydration: use the inclined screw Water Extraction Machinery to make the wood chip mass dryness fraction reach 30～40%;
3, extruding and tearing: utilizing compression ratio is that 1: 4.0～1: 6.0 extruding and tearing machine is squeezed into the wood wool shape with wood chip;
4, pre-preg: will push the back wood chip and impregnated in the sodium sulfite solution that contains DTPA, and get into reaction warehouse reaction 30min;
5, preheating: in preheater, carry out preheating with steam;
6, high consistency refining: under 35～40% concentration, carry out high consistency refining one time;
7, disappear latent: mill back slurry diluted concentration to 4～5% disappears latent;
8, low dense defibrination: the disposed slurry low dense defibrination under 3～4% concentration of diving disappears;
9, screening: three sections screenings under 2～4% concentration;
10, washing: the screening disposed slurry under 1～2% concentration through the washing of polydisc wash engine, the washing back use two roller Water Extraction Machinerys dewater to concentration be 30～35%;
11, high dense blender: mix with the alkaline hydrogen peroxide that contains DTPA;
12, bleaching tower: in bleaching tower, react 1.5～2.0h, bleaching concentration is 30～35%;
13, four series connection Double screw pulp extruders extract waste liquid: bleaching back slurry uses the Double screw pulp extruder of four series connection to extract waste liquid; The inlet concentration of every Double screw pulp extruder is 15%～25%; Exit concentration is 35%～40%, and from the 4th adding clear water, the total recovery rate of waste liquid is 85～95%; The waste liquid solid content that extracts is 4.0～6.0%, and waste liquid send the alkali recycling;
14, the storage slurry is subsequent use: it is subsequent use that adding plain boiled water is regulated concentration to 4.5～10%.
Embodiment two: the improved BCTMP technology of the present invention new technological process combines Fig. 2 to explain as follows:
1, wood chip washing: length 15～20mm, thickness 3～5mm, width are removed silt less than the wood chip of 10mm through water washing;
2, wood chip dehydration: use the inclined screw Water Extraction Machinery to make the wood chip mass dryness fraction reach 30～40%;
3, extruding and tearing: utilizing compression ratio is that 1: 4.0～1: 6.0 extruding and tearing machine is squeezed into the wood wool shape with wood chip;
4, pre-preg: will push the back wood chip and impregnated in the sodium sulfite solution that contains DTPA, and get into reaction warehouse reaction 30min;
5, preheating: in preheater, carry out preheating with steam;
6, high consistency refining: under 35～40% concentration, carry out high consistency refining one time;
7, disappear latent: mill back slurry diluted concentration to 4～5% disappears latent;
8, low dense defibrination: the disposed slurry low dense defibrination under 3～4% concentration of diving disappears;
9, screening: three sections screenings under 2～4% concentration;
10, washing: the screening disposed slurry under 1～2% concentration through the washing of polydisc wash engine, the washing back use two roller Water Extraction Machinerys dewater to concentration be 30～35%;
11, high dense blender: mix with the alkaline hydrogen peroxide that contains DTPA;
12, bleaching tower: in bleaching tower, react 1.5～2.0h, bleaching concentration is 30～35%;
13, three series connection Double screw pulp extruders extract waste liquid: bleaching back slurry uses the Double screw pulp extruder of three series connection to extract waste liquid; The inlet concentration of every Double screw pulp extruder is 15%～25%; Exit concentration is 35%～40%, and from the 3rd adding clear water, the total recovery rate of waste liquid is 80～90%; The waste liquid solid content that extracts is 4.0～6.0%, and waste liquid send the alkali recycling;
14, the storage slurry is subsequent use: it is subsequent use that adding plain boiled water is regulated concentration to 4.5～10%.
Claims (1)
1. improved BCTMP new technological process, its new technological process characteristic is carried out as follows:
1) wood chip washing: length 15～20mm, thickness 3～5mm, width are removed silt less than the wood chip of 10mm through water washing;
2) wood chip dehydration: use the inclined screw Water Extraction Machinery to make the wood chip mass dryness fraction reach 30～40%;
3) extruding and tearing: utilizing compression ratio is that 1: 4.0～1: 6.0 extruding and tearing machine is squeezed into the wood wool shape with wood chip;
4) pre-preg: will push the back wood chip and impregnated in the sodium sulfite solution that contains DTPA, and get into reaction warehouse reaction 30min;
5) preheating: in preheater, carry out preheating with steam;
6) high consistency refining: under 35～40% concentration, carry out high consistency refining one time;
7) disappear latent: mill back slurry diluted concentration to 4～5% disappears latent;
8) low dense defibrination: the disposed slurry low dense defibrination under 3～4% concentration of diving disappears;
9) screening: three sections screenings under 2～4% concentration;
10) washing: the screening disposed slurry under 1～2% concentration through the washing of polydisc wash engine, the washing back use two roller Water Extraction Machinerys dewater to concentration be 30～35%;
11) high dense blender: mix with the alkaline hydrogen peroxide that contains DTPA;
12) bleaching tower: in bleaching tower, react 1.5～2.0h, bleaching concentration is 30～35%;
13) three or four series connection Double screw pulp extruders extraction waste liquids: bleaching back slurry uses the Double screw pulp extruder extraction waste liquid of three or four series connection; The inlet concentration of every Double screw pulp extruder is 15%～25%; Exit concentration adds clear water 35%～40% from last, and the total recovery rate of waste liquid is 80～95%; The waste liquid solid content that extracts is 4.0～6.0%, and waste liquid send the alkali recycling;
14) the storage slurry is subsequent use: it is subsequent use that adding plain boiled water is regulated concentration to 4.5～10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100643755A CN102535217A (en) | 2012-03-13 | 2012-03-13 | Improved new bleached chemithermomechanical pulp (BCTMP) process |
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| CN2012100643755A CN102535217A (en) | 2012-03-13 | 2012-03-13 | Improved new bleached chemithermomechanical pulp (BCTMP) process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109208365A (en) * | 2018-10-22 | 2019-01-15 | 北京华浩荣创科技有限公司 | A kind of pulp production plant, pulping process and paper pulp manufacturing technique |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587502A (en) * | 2004-09-14 | 2005-03-02 | 天津科技大学 | New process for producing alkaline hydrogen peroxide mechanical pulp by double scrwe extruding method |
| CN101718048A (en) * | 2009-11-09 | 2010-06-02 | 天津科技大学 | Pretreatment process for producing bleaching thermo mechanical pulp by using mixed broad-leaved wood material |
| MY144559A (en) * | 2008-12-26 | 2011-10-05 | Green Patent Technologies Sdn Bhd | Pulp making technology using empty fruit bunches (efb) of oil palm by a method of high-density extruding recycling system |
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2012
- 2012-03-13 CN CN2012100643755A patent/CN102535217A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587502A (en) * | 2004-09-14 | 2005-03-02 | 天津科技大学 | New process for producing alkaline hydrogen peroxide mechanical pulp by double scrwe extruding method |
| MY144559A (en) * | 2008-12-26 | 2011-10-05 | Green Patent Technologies Sdn Bhd | Pulp making technology using empty fruit bunches (efb) of oil palm by a method of high-density extruding recycling system |
| CN101718048A (en) * | 2009-11-09 | 2010-06-02 | 天津科技大学 | Pretreatment process for producing bleaching thermo mechanical pulp by using mixed broad-leaved wood material |
Non-Patent Citations (2)
| Title |
|---|
| 梁实梅: ""浅谈用双螺旋挤浆机提取草浆黑液的设备选型"", 《中华纸业》 * |
| 田治鼎 贺廷福 等: "Andritz的备料***和Metso的磨浆***在华泰速生杨BCTMP生产线上的选用", 《中华纸业》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109208365A (en) * | 2018-10-22 | 2019-01-15 | 北京华浩荣创科技有限公司 | A kind of pulp production plant, pulping process and paper pulp manufacturing technique |
| CN109208365B (en) * | 2018-10-22 | 2024-03-29 | 北京华浩荣创科技有限公司 | Pulp production equipment, pulping process and pulp production process |
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Application publication date: 20120704 |