CN1143913C - Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process - Google Patents
Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process Download PDFInfo
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- CN1143913C CN1143913C CNB011362340A CN01136234A CN1143913C CN 1143913 C CN1143913 C CN 1143913C CN B011362340 A CNB011362340 A CN B011362340A CN 01136234 A CN01136234 A CN 01136234A CN 1143913 C CN1143913 C CN 1143913C
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Abstract
The present invention provides a method for continuously producing cotton pulp by using transverse pipe cooking equipment. The cooking and bleaching processes of cotton pulp are finished once in transverse pipe cooking equipment. Cotton fiber in pulp is cut to be short before a cotton fiber raw material used for the present invention enters the transverse pipe cooking equipment, and a wet method is preferably selected to cut a material. The technical difficulties that the fiber pulp can not be uniformly transported or fed, and can not be wound, etc. in a transverse pipe are solved by the determination of technological parameters and the reasonable combination of equipment. The transverse pipe cooking equipment is used for simultaneously finishing the cooking and bleaching processes. The present invention is used as a continuous pulping technique for the cotton pulp, and the innovation of a pulping technique for the cotton pulp is realized by the present invention.
Description
Invention field
The present invention relates to pulping technique in the paper industry, relate in particular to and adopt transverse tube to steam the method that the technology of floating is produced cotton pulp continuously.
Background of invention
Paper technology is divided into slurrying and copies the paper two large divisions, different according to the purposes of paper products and quality requirement, and pulping process divides soda pulping process and acid polishing again.Traditional pulping process mostly is soda pulping process, and its exhaust emission is well-known environmental protection emphasis, and along with the enhancing and the science and technology development of global environmental protection consciousness, technological improvement becomes inexorable trend already.Employing NaOH+H has appearred in the seventies
2O
2Steaming and bleaching process of the cotton pulp slurrying of (alkaline hydrogen peroxide), this Environmentally-sound technology has the enterprise of scale and strength progressively to be adopted with its significant superiority abroad.At present, the cotton pulp steaming and bleaching process of countries in the world has replaced the alkaline cooking technology that traditional slurrying is of poor quality, environmental pollution is serious with the alkaline hydrogen peroxide steaming and bleaching process mostly.
High-grade paper products adopt cotton pulp more, and especially banknote all must adopt cotton pulp with the paper of using of paper and marketable securities.At present, the process of cotton pulp slurrying and equipment mainly contain three kinds:
One, utilize traditional rotary spherical digester or steamer, soda pulping process, digestant is NaOH; Hypochlorite bleaching, bleaching agent are NaClO, Ca (ClO)
2Its half stuff equipment is for washing the machine of kowtowing, and the mode of production is a batch (-type);
Two, a pot slurrying is floated in the cake-steaming of beating of the eighties (being derived from Germany) that begin to adopt mid-term, uses NaOH+H
2O
2Steam and float, half stuff equipment is whirlwind processor (i.e. " TORNADO "), and the mode of production still is a batch (-type);
Three, continuous producing method comprises:
1, the Bivis double spiral tube steams continuously and floats slurrying, and steaming and floating agent is NaOH+H
2O
2, mainly be used in France, Britain;
2, equipment and technology are floated in tower continuous steaming, and steaming and floating agent is NaOH+H
2O
2, the gloomy factory in for example German Louis adopts;
In above technology, first and second kind technology path and equipment are backward step pulping technique, and complex operation can't be realized the programme-control of slurrying overall process, along with social development will progressively be eliminated.
The serialization that slurrying is produced is the direction of each enterprise development in the industry, and two kinds of present continuous slurrying production technologies need expensive equipment investment, and the equipment of for example introducing 10,000 tons of slurrying capacity needs 6,000,000 dollars, and general enterprise does not have such economic strength.In addition, according to the investigation textual criticism, it is the fiber " knot " that double helix causes that the Bivis double spiral tube even steams the problem that is prone in the explained hereafter cotton pulp, is the defective workmanship that this equipment causes.That is to say that explore smaller equipment input, the production technology of producing the cotton pulp product of same quality will have significant Practical Benefit.
Summary of the invention
At the current situation in slurrying field, the present invention proposes the method that adopts the continuous steaming and bleaching process of transverse tube to produce cotton pulp, under the prerequisite that does not increase equipment investment, realize adopting alkaline hydrogen peroxide to make to steam the steaming technology of floating of floating agent and produce cotton pulp continuously.
Continuous steaming and bleaching process of transverse tube and transverse tube continuous steamer equipment are mainly used in traditional soda pulping process at present, are the boiling of the short fibered pulp of raw material with straw and reed fiber especially.The present invention has realized using it for the serialization production of cotton pulp slurrying by technology being studied and corollary equipment being made up and improves.The cotton pulp continuous producing method that the present invention proposes comprises that adopting cotton fiber material to utilize the transverse tube digesting apparatus to realize that disposable continuous steaming is floated finishes boiling and bleaching process, wherein, enter that cotton fiber is prescinded in the slurry of transverse tube digesting apparatus, boiling and bleaching process use NaOH and hydrogen peroxide to float agent as steaming, add wetting agent and stabilizing agent simultaneously.
The enforcement key of the inventive method is to control the cotton fiber length in the slurry that enters the transverse tube boiling vessel, it is prescinded in advance, the preferred wet method blank (promptly to being cut off again after the preimpregnation of slurry elder generation) that adopts has guaranteed that cotton pulp passes through smoothly in continuous steamer inside; Combination by equipment and technological parameter definite guaranteed to float in same steaming and once finished boiling and bleaching in the equipment simultaneously.
Detailed Description Of The Invention
As previously mentioned, the greatest difficulty that adopts the transverse tube continuous digesting apparatus to prepare cotton pulp is exactly the conveying of slurry, because cotton fiber itself is about 29mm, be longer than the pulping fibre length of the 1-2mm of other short stocks such as straw pulp, fiber " knot " is appearring easily by in the transverse tube boiling vessel of helical feed, so one of key feature of realizing technical solution of the present invention is before entering boiling vessel the fiber of slurry to be prescinded, to adapt to the requirement of helical feed, guaranteed that the conveying of slurry in continuous steamer is smooth and easy.
Known have a multiple method and apparatus that can be used for cutting off cotton fiber, for example comprise that artificial cut staple or stock-cutter prescind etc., the blank mode also can comprise dry method blank and wet method blank, the present invention preferably adopts the wet method blank, and promptly raw material first preliminary wetting behind opener is carried out blank then, fibre length is met the demands, the preferred scheme according to the present invention, fibre length should be similar to the fibre length of short stocks such as straw pulp in the slurry of use, promptly generally below 3mm.
As suitability for industrialized production, the present invention preferably adopts stock-cutter to carry out the wet method blank, can adopt known in the industry blank equipment, as hollander, whirlwind processor (i.e. " TORNADO ") etc., general no specific (special) requirements and change for example can be used the TORNADO stock-cutter.These equipment all are to be used for handling half stuff (i.e. the slurry of handling through boiling and bleaching) in present technology, slurry floats its shell of back through steaming and is removed basically, cut off processing this moment is to be relatively easy to, and according to the present invention technology, the cotton pulp that enter stock-cutter this moment is a long fiber, and be the raw material of handling without slurrying, mainly show the more stiff difficult cut-out of living pulp fibres with the half stuff difference, in order to improve the cut-out ability of stock-cutter, when being preferably in blank slurry is stirred, can in the stock-cutter of routine, agitator be set, improve the uniformity coefficient of handling slurry, can certainly adopt any other measure to reach same effect.
When adopting stock-cutter to carry out the wet method blank, in case selected the kind of stock-cutter, concrete operations, for example process conditions such as stock-cutter operating curve, blank time, input concentration determines, can realize that for a person skilled in the art for example can adopt above-mentioned stock-cutter (TORNADO), the slurry concentration that enters stock-cutter can be at 3-5%, this stock-cutter can be provided with agitator, and agitator applies stirring to slurry simultaneously in the blank process.
According to preferred version of the present invention, be admitted to the transverse tube boiling vessel by the slurry after prescinding through the excess pressure mixer, this is one of difference of feed system of the present invention and other feed system, purpose is to be beneficial to slurry and to steam the infiltration that mixes of floating chemical raw materials such as agent.Because connecting, steams in the technology by conventional transverse tube, the raw material that enters Lian Zhengguan is a siccative, the slurry of the relative humidity through the wet method blank of the mixing infiltration of siccative and chemical raw material is much easier, so the present invention has increased the pressure mixing device in feed system, making slurry and steaming float first the interpenetrating of agent in mixing device mixes, enter boiling vessel then, slurry also has been applied in certain pressure when mixing, the pressure basically identical is floated in the size of this pressure and steaming, thereby has guaranteed to steam the quality of floating.The present invention can use known pressure mixing device, and this equipment generally is used to tri-stage bleaching technology in the prior art.
As previously described, creative place of the present invention is exactly to adopt the continuous steaming of the transverse tube digesting apparatus realization cotton pulp that is used for straw pulp in the prior art to float, the inventor is through repeatedly exploratory experiment, determine that used transverse tube boiling vessel itself does not need to be transformed substantially, but proposed feasible operating procedure parameter, wherein, steaming and floating pressure is 2.0-4.0bar, the steaming time of floating is 30-60min, and steaming and floating temperature is 85-140 ℃.
The preferred secondary transverse tube boiling vessel continuously cooking that adopts, the steaming of first order transverse tube boiling vessel is floated temperature at 85-95 ℃, and the steaming of second level transverse tube boiling vessel is floated temperature at 105-140 ℃.
The chemical raw material that uses in the steaming and bleaching process of the present invention comprises that the steaming that is made of NaOH and hydrogen peroxide floats agent and wetting agent, stabilizing agent, with respect to the bone dry fiber raw material, the addition of NaOH and hydrogen peroxide is respectively 2.5-3.5% and 1-3%, and the addition of wetting agent is 0.05-0.2%, and the addition of stabilizing agent is 0.1-0.5%.Wherein, wetting agent can be conventional for example TC-1 (one subsidiary factory of Tianjin synthetic detergent factory production of surfactant, its main active ingredient is sodium alkyl benzene sulfonate), green oxygen (production of road, Zhengzhou City purifying worker technology company) etc., stabilizing agent comprises ethylenediamine tetra-acetic acid (EDTA), diethylene-triamine pentaacetic acid (DTPA) etc.
Pulp washing is an operation essential in all pulp production, and the general slurry washing equipment that adopts is: side pressure thickener, decker, belt rinsing maching etc., and adopt displacement washing technology etc.The present invention preferably makes and is steamed the slurry that floated in the transverse tube boiling vessel in conjunction with the characteristics of cotton pulp, and order is carried out pulp washing by inclined screw thickener and acroll press washer and handled.Described inclined screw adds acroll press washer equipment and generally is used for secondary stock, screenings concentrate or the high dense processing procedure of secondary stock deinking washing, the present invention creatively uses it for the pulping process of cotton pulp, forms the spiral dewater group, has played energy-efficient beneficial effect.
Why be referred to as efficiently is that usually at 30-40%, and the pulp concentration of other washing facility also need be equipped with other concentrator generally less than 10% because the concentration of the slurry that comes out from this washing facility can reach nearly 40%.Can not use this pulp washing technology and even steam the straw pulp that comes from transverse tube, this is that liquid viscosity is big owing to impurity in the straw pulp is many, and fiber is short, causes loss many.The present invention more preferably adopts this dehydration unit to carry out the above multistage pulp washing of one-level, and for example secondary overflow pulp washing technology promptly, makes slurry pass through two groups of washing devices.Certainly, in order to adapt to the processing of long stuff, need suitably to increase the power of washing facility.
Wet slurry after prescinding enters the preceding pulp washing process of feed system of transverse tube boiling vessel and also can use above-mentioned spiral dewater group to finish.
Also comprised the refining process in the conventional pulping process in the production method of the present invention, used conventional tapering jordan, the paper pulp that obtains can be sent into machine hand's preface.
As mentioned above, the present invention creatively is used for the transverse tube continuous digesting apparatus that uses in the straw pulp production serialization production of cotton pulp, has once finished the boiling and the bleaching process of cotton pulp in the transverse tube digesting apparatus.And when utilizing the transverse tube digesting apparatus to produce short stock such as straw pulp, in this equipment, can only finish boiling, before bleaching, also need filtering stock, this is owing to have more impurity in other raw materials such as straw pulp, if carry out the bleaching of slurry in the time of boiling, not only effect is bad, does not reach the requirement of stock quality, and can consume more industrial chemicals, this is well known in the art.And the relative much less of impurity in the cotton fiber material, it is again unique paper making raw material that exists with single fiber at nature, do not need stronger digestion process, and, do not need washing process between boiling and the bleaching, need not miscellaneous equipment, the present invention has utilized these characteristics of cotton pulp just, by determining and the reasonable combination of equipment of technological parameter, solved that fibre stuff is moved is unobstructed in transverse tube, feeding is even, technological difficulties such as does not twine, and utilizes the transverse tube digesting apparatus to finish boiling and bleaching process simultaneously.As another serialization cotton pulp pulping technique, realized the innovation of cotton pulp pulping technique.
Relevant testing result shows that all two kinds of production technologies with on the books are suitable on every quality index for the cotton pulp paper pulp that pulping process of the present invention is produced, but the input of equipment is much lower.
Invention embodiment
Accompanying drawing 1 is the process chart of the embodiment of the invention 1.
Below further specify realization of the present invention by specific embodiment, be intended to help the reader to understand feature of the present invention better, limit but practical range of the present invention is not constituted.
Embodiment 1
The bale of cotton adds the pulping waste liquor of 7 cubic metres/ton (liquid volume addeds (cubic meter)/inventory (ton)) in cyclone separator behind the opener opener, after acroll press washer was extruded, the outlet mass dryness fraction was 33%, and extruding waste liquid amount is 5M
3/ T.Detersive efficiency is 71.4%; After material enters the stock-cutter (TORNADO) that is provided with agitator through conveying worm, when stirring, add 22M
3The useless slurry of/T slurrying, adjusting slurry concentration is 4.0%, steams the preliminary cut-out before floating, and the average length of pulp fiber is below 3mm, and the concrete operations condition of blank is as follows:
-blank concentration: 3～5%
-blank the time: 0.5～1.5h
-blank peak load: 85%
-power of motor: 315kw
-treatment process curve (dividing) with motor load:
50～60％ 5～15min
70～80％ 5～15min
80～90％ 1～1.5h
Material after prescinding is sent into the spiral dewater group that inclined screw thickener and acroll press washer are composed in series by stock tank, wherein,
Inclined screw: 2 * 1.25m
2Two webmaster inclined screws concentrate unit;
Inclined screw advances to starch concentration: 3-4%;
Inclined screw pulp concentration: 10-12%;
Power of motor 11kW.
The model of acroll press washer: Φ 380 acroll press washers;
Acroll press washer advances to starch concentration: 10-12%;
Acroll press washer pulp concentration: 40%;
Power of motor 39kW.
Dehydrating amount is 22.5M
3/ T realizes steaming the washing process that floats preceding slurry.
Slurry after the washing enters the pressure mixer through meter and feeding serew device, adds about 3% NaOH and about 1.2% H through another meter simultaneously
2O
2And about 0.08% green oxygen of wetting agent (production of road, Zhengzhou City purifying worker technology company) and about 0.2% stabilizing agent EDTA (all with respect to the bone dry fiber raw material), enter the transverse tube steaming device after the pressurized mixing of material, carrying out about 30～50 minutes secondary transverse tube steaming under the pressure of 2.0～3.0Mpa floats, the first order is steamed and is floated about 90～95 ℃ of temperature, the second level is steamed and is floated about 105～120 ℃ of temperature, and the slurry that steams after floating enters spraying pot.
Slurry adds 22.5M through the spiral dewater group dehydration identical with the front in the equal pulp grinder of waterpower
3The clear water of/T carries out the tandem dehydration second time (specification of equipment is identical) again, and the concentration of slurry when acroll press washer comes out is 40%, finishes the pulp washing process.
Slurry through big tapering jordan series connection making beating, is finished the slurrying overall process through stock tank.
The half stuff index that the present embodiment pulping process obtains:
Concentration: 3.0-4.5%
Beating degree: 12-16 ° SR
Weight in wet base: 14-18g
Whiteness: 〉=80%
Dust :≤100mm
2/ 500g oven dry stock half stuff intensity: breaking length 〉=3500m
Folding strength 〉=1500 pair time.
Claims (9)
1, the continuous producing method of cotton pulp, it comprises that adopting cotton fiber material to utilize the transverse tube digesting apparatus to float through disposable continuous steaming finishes boiling and bleaching process, wherein, enter in the slurry of transverse tube digesting apparatus cotton fiber prescinded to average fiber length below 3mm, boiling and bleaching process use NaOH and hydrogen peroxide to float agent as steaming, also add wetting agent and stabilizing agent simultaneously, and steaming and floating pressure is 2.0-4.0bar, the steaming time of floating is 30-60min, and steaming and floating temperature is 85-140 ℃.
2, the described production method of claim 1, wherein, cotton fiber material earlier through prescinded behind the preliminary wetting to average fiber length below 3mm.
3, the described production method of claim 2 wherein, adopts stock-cutter that cotton fiber material is implemented the wet method blank.
4, claim 2 or 3 described production methods wherein, are admitted to the transverse tube boiling vessel by the slurry after prescinding through the excess pressure mixer.
5, the described production method of claim 1, wherein, with respect to the bone dry fiber raw material, the addition of NaOH and hydrogen peroxide is respectively 2.5-3.5wt% and 1-3wt%.
6, claim 1 or 5 described production methods wherein, adopt secondary transverse tube boiling vessel continuously cooking, and the steaming of first order transverse tube boiling vessel is floated temperature at 85-95 ℃, and the steaming of second level transverse tube boiling vessel is floated temperature at 105-140 ℃.
7, the described production method of claim 1, wherein, with respect to the bone dry fiber raw material, the addition of wetting agent is 0.05-0.2wt%, the addition of stabilizing agent is 0.1-0.5wt%.
8, the described production method of claim 1 wherein, is steamed the slurry order of floating and is carried out the pulp washing processing by inclined screw thickener and acroll press washer in the transverse tube boiling vessel.
9, the described production method of claim 8, wherein, this pulp washing process comprises and adopts inclined screw thickener connect with the acroll press washer one-level or the above overflow pulp washing of one-level of unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011362340A CN1143913C (en) | 2001-10-11 | 2001-10-11 | Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process |
| HK02105880.0A HK1044357B (en) | 2001-10-11 | 2002-08-12 | Method for producing cotton pulp using process of horizontal continuous digestion and bleaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011362340A CN1143913C (en) | 2001-10-11 | 2001-10-11 | Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1352336A CN1352336A (en) | 2002-06-05 |
| CN1143913C true CN1143913C (en) | 2004-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011362340A Expired - Fee Related CN1143913C (en) | 2001-10-11 | 2001-10-11 | Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1143913C (en) |
| HK (1) | HK1044357B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078185B (en) * | 2006-05-24 | 2012-05-23 | 黄正华 | Application of sodium peroxide mixing solution containing sodium ozonide in preparing paper pulp |
| CN105821701B (en) * | 2016-04-08 | 2017-12-15 | 安徽雪龙纤维科技股份有限公司 | A kind of cotton pulp and preparation method thereof and a kind of carboxymethyl cellulose and preparation method thereof |
| CN111395026A (en) * | 2019-01-03 | 2020-07-10 | 安徽雪龙纤维科技股份有限公司 | Production method of high-viscosity cotton pulp |
| CN114657811A (en) * | 2022-02-18 | 2022-06-24 | 临清市正德短绒纸业有限公司 | Production process of cotton linter pulp |
| CN115262257B (en) * | 2022-06-28 | 2023-09-05 | 轻工业杭州机电设计研究院有限公司 | Continuous cooking preparation method of manila hemp pulp |
-
2001
- 2001-10-11 CN CNB011362340A patent/CN1143913C/en not_active Expired - Fee Related
-
2002
- 2002-08-12 HK HK02105880.0A patent/HK1044357B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1352336A (en) | 2002-06-05 |
| HK1044357B (en) | 2004-07-30 |
| HK1044357A1 (en) | 2002-10-18 |
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