CN101418470A - Method for preparing pulp for chemical fabrics - Google Patents
Method for preparing pulp for chemical fabrics Download PDFInfo
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- CN101418470A CN101418470A CNA2008101604639A CN200810160463A CN101418470A CN 101418470 A CN101418470 A CN 101418470A CN A2008101604639 A CNA2008101604639 A CN A2008101604639A CN 200810160463 A CN200810160463 A CN 200810160463A CN 101418470 A CN101418470 A CN 101418470A
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- ionic liquid
- cation
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- 239000000126 substance Substances 0.000 title claims abstract description 22
- 239000004744 fabric Substances 0.000 title claims description 14
- 238000000034 method Methods 0.000 title abstract description 19
- 229920002678 cellulose Polymers 0.000 claims abstract description 59
- 239000001913 cellulose Substances 0.000 claims abstract description 54
- 239000002608 ionic liquid Substances 0.000 claims abstract description 30
- 239000008234 soft water Substances 0.000 claims abstract description 19
- 239000010902 straw Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims description 23
- 238000002360 preparation method Methods 0.000 claims description 16
- 150000001768 cations Chemical class 0.000 claims description 14
- 230000008929 regeneration Effects 0.000 claims description 13
- 238000011069 regeneration method Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 150000001450 anions Chemical class 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 4
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 4
- 125000005210 alkyl ammonium group Chemical group 0.000 claims description 3
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 claims description 3
- 206010033546 Pallor Diseases 0.000 claims description 2
- 239000004627 regenerated cellulose Substances 0.000 claims description 2
- 238000004061 bleaching Methods 0.000 abstract description 14
- 239000000835 fiber Substances 0.000 abstract description 11
- 238000004090 dissolution Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000001172 regenerating effect Effects 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract 2
- 238000004537 pulping Methods 0.000 abstract 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000004513 sizing Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 17
- 244000068988 Glycine max Species 0.000 description 10
- 235000010469 Glycine max Nutrition 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229920000742 Cotton Polymers 0.000 description 9
- 241000219146 Gossypium Species 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229920005610 lignin Polymers 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- YRGNNOABGRMUKR-UHFFFAOYSA-N Cl(=O)(=O)O.C(CCC)N1CN(C=C1)C Chemical compound Cl(=O)(=O)O.C(CCC)N1CN(C=C1)C YRGNNOABGRMUKR-UHFFFAOYSA-N 0.000 description 3
- 229920000875 Dissolving pulp Polymers 0.000 description 3
- 240000008042 Zea mays Species 0.000 description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- -1 quaternary ammonium alkyl CATION Chemical class 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 235000009973 maize Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 240000006394 Sorghum bicolor Species 0.000 description 1
- 235000015505 Sorghum bicolor subsp. bicolor Nutrition 0.000 description 1
- 235000011684 Sorghum saccharatum Nutrition 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001449 anionic compounds Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000021050 feed intake Nutrition 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001412 inorganic anion Inorganic materials 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002892 organic cations Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention discloses a method for preparing chemical fiber pulp. The method adopts ionic liquid to dissolve cellulose in plant straw, and prepares the chemical fiber pulp through a regenerating-cleaning mode of regenerating the dissolved cellulose to be cellulose and then clean the cellulose. The method comprises the following: a step of preparing materials, which is to grind and dry the materials; a step of dissolving, which is to mix raw materials with ionic liquid and dip the raw materials in the ionic liquid; a step of regenerating and cleaning the cellulose washed with soft water; a step of bleaching sizing agents; and a steps of pulping. The method changes high temperature, high pressure and drastic chemical changes in the prior digesting-pulping art into a moderate physical dissolution, thereby greatly reducing energy consumption and ensuring that a whole production process is more friendly to environment, safe and controllable. In addition, as drastic digesting reaction does not exist in the method, the generation of black liquor is thoroughly avoided, thereby ensuring that the production which is green, friendly to environment and sustainable becomes possible.
Description
Technical field
The present invention relates to a kind ofly prepare chemical fibre with the new method of dissolving pulp, be meant that especially a kind of novel dissolvent ionic liquid that utilizes comes dissolving cellulos to prepare the technology of pulp with straw.
Background technology
Cellulose is the abundantest in the world natural organic matter, accounts for more than 50% of plant kingdom's carbon content.The content of cellulose of cotton is near 100%, is natural pure cellulose source.In the general timber, cellulose comprises 40-50% also has the hemicellulose of 10-30% and the lignin of 20-30%.Content of cellulose about 41.23% in the cotton stalk, lignin content about 23.16%, ash content about 9.47%.In addition, fiber crops, straw, straw, bagasse, maize straw, broomcorn straw, cotton stalk, soybean stalk etc. all are cellulosic abundant sources.
Estimate that according to scientist nature can produce several hundred billion tons cellulose by photosynthesis every year, yet, still have only about 6,000,000,000 tons cellulose to be used by people.In today of petroleum resources worsening shortages, make full use of the abundant cellulose resource development cellulose industry of nature and have profound significance.
At present, the flow process that people utilize native cellulose to prepare dissolving pulp mainly is: the material → making beating of getting the raw materials ready → feed intake → boiling → wash → selected → chlorination → bleaching → selected → copy several big steps of slurry produces a large amount of black liquor and can produce very big pollution and destruction to water body and environment in the middle of this.Therefore, the pulp production new technique of energy-saving and environmental protection is the target that people seek assiduously always.
Ionic liquid claims ionic liquid at room temperature (RTILs) again, is promptly formed, do not had the liquid of electroneutral molecule near room temperature or room temperature fully by ion.Common ion liquid is made up of organic cation and inorganic anion.Compare with electrolyte with conventional organic solvents, ionic liquid has following characteristics: (1) ionic liquid vapour pressure approaches zero, non-volatile, nonflammable, still can keep stable under the high temperature; (2) ionic liquid has the electrochemical window greater than 3V, good conductivity; (3) ionic liquid is stable to water and air, is convenient to operation and is easy to reclaim; (4) ionic liquid has very wide liquid temperature scope, helps dynamics Controlling; (5) the ionic liquid cellulose is the abundantest natural macromolecular material of occurring in nature, and they are renewable, biodegradable, and its development and utilization is subjected to paying close attention to widely always.But because native cellulose has higher degree of crystallinity, intermolecular and molecular memory is at a large amount of hydrogen bonds, it is not dissolved in water and most of organic solvent, this becomes the biggest obstacle of cellulose in application and development, directly dissolving cellulos can keep the characteristic of native cellulose to greatest extent, and the dicyandiamide solution of the directly effective dissolving cellulos of exploitation is the key that solves this difficult problem.Ionic liquid have broad the liquid temperature scope, stable to water and air, dissolubility is good, non-volatile and characteristics such as easy recovery, is considered to replace the green molten toner of volatile chemical solvent.
Inorganic matter, organic matter and macromolecular material are shown good dissolving ability, can substitute the new technology of original organic solvent as the exploitation of the solvent in chemical reaction medium and process cleaner production.Ionic liquid more and more is applied to fields such as organic synthesis, separation, electrochemistry and materials processing now, and has obtained good effect.
Ionic liquid is of a great variety, changes CATION and anionic various combination, can design to synthesize different ionic liquids.General CATION is an organic principle, and classifies according to cationic difference.Common cation type has quaternary ammonium alkyl CATION, alkyl quaternary phosphonium cations, N-alkyl pyridine CATION and N in the ionic liquid, N-dialkylimidazolium CATION etc., and wherein modal is N, N-dialkylimidazolium CATION.
Alkyl ammonium cation Wan Ji phosphonium cation N, N '-dialkylimidazolium CATION N-alkyl pyridine CATION
General anion has CI
-, BF
4 -, PF
4 -, SCN
-, CF
3SO
3 -, CF
3COO
-, (CF
3SO
2)
2N
-, (CF
3SO
2)
2C
-
Cellulose is the abundantest natural macromolecular material of occurring in nature, and they are renewable, biodegradable, and its development and utilization is subjected to paying close attention to widely always.But because native cellulose has higher degree of crystallinity, intermolecular and molecular memory is at a large amount of hydrogen bonds, it is not dissolved in water and most of organic solvent, this becomes the biggest obstacle of cellulose in application and development, directly dissolving cellulos can keep the characteristic of native cellulose to greatest extent, and the dicyandiamide solution of the directly effective dissolving cellulos of exploitation is the key that solves this difficult problem.Ionic liquid have broad the liquid temperature scope, stable to water and air, dissolubility is good, non-volatile and characteristics such as easy recovery, is considered to replace the green solvent of volatile chemical solvent.
Summary of the invention
Technical problem to be solved by this invention has provided a kind of to water body and environmental nonpollution and destruction, and the preparation method of the pulp for chemical fabrics of energy-saving and environmental protection.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of preparation method of pulp for chemical fabrics, comprise the cellulosic dissolving step that adopts in the ionic liquid dissolving straw, with will dissolve cellulose regeneratedly carry out selected regeneration and selected step after becoming cellulose.
Described dissolving step is to adopt the straw smalls to mix with the mass ratio of relative ionic liquid 4%-18%, soak 30-120min down at 90 ℃-98 ℃, stir also afterwards and be warming up to 105-115 ℃ gradually, be evacuated to simultaneously vacuum-0.085--0.1MPa, with the air in the continuous removal solution and cellulose is constantly dissolved, generating viscosity is the no bubble solution of 160-1200Pa.S, and can keep this temperature and vacuum a period of time such as 2-6h, the bubble so that cellulose is dissolved fully in the solution has also obtained removing.And adopt earlier and mix with the straw smalls again with the ionic liquid purification and after being heated to 90 ℃.Can adopt during dissolving stalk smalls and ionic liquid are slowly added common dissolution kettle or to fall in poly-jar and mix all usefulness fully, and the rotating speed that stirs agitator when heating up adopts 200-1100r/min.
Described regeneration and selected step be will dissolving after the slow batch turning of no bubble solution that makes to soft water and stir the regeneration cellulose, then regenerated cellulose is adopted after the soft water washing the slurry of cellulose content 〉=90%.Can adopt with the slow batch turning of solution to the soft water pond, batch turning limit, limit stirs, stalk cellulose is suspended in the soft water pond with regard to the regeneration cellulose like this, other lignin, ash, iron etc. are not tolerant then to be sunken at the bottom of the pond.The two is separated, and just the stalk cellulose that can obtain choosing carries out the soft water washing with it, as adopting the soft water washing just can obtain cellulose content at the slurry more than 90% 4-6 time to it.Ionic liquid in the pulp washing waste liquid is purified and just can be used repeatedly.
Need to carry out earlier material preparation step before the described dissolving step, material preparation step is that to select the degree of polymerization for use be the smalls that the straw of 400-2000 is ground into 50-200 order size, then at 100-110 ℃ of oven dry 8-12h down, oven dry back stalk moisture content≤2%.Straw can adopt the stalk of plants such as cotton stalk, maize straw.And can screen straw, to remove the miscellaneous material that contains wherein.
Ionic liquid is made up of CATION and anion, and CATION is one or more in the following CATION:
Alkyl ammonium cation Wan Ji phosphonium cation N, N '-dialkylimidazolium CATION N-alkyl pyridine CATION
Anion is CI
-, BF
4 -, PF
4 -, SCN
-, CF
3SO
3 -, CF
3COO
-, (CF
3SO
2)
2N
-(CF
3SO
2)
2C
-In one or more.
For improving the quality of pulp, can be to bleaching through the cellulose of regenerating and selected step obtains, blanching step can adopt in the slurry of stalk cellulose that to add mass concentration be about 5% bleaching liquid, under 50 ℃, bleaching 90min, during can carry out suitable adjustment to the addition of bleaching liquid and bleaching temperature and time according to the actual conditions of producing.Bleaching liquid can adopt chlorine liquid or liquor natrii hypochloritis.
Then the slurries after the bleaching are copied slurry and handle, and oven dry, cellulose pulp obtained.
Straw through above-mentioned get the raw materials ready, dissolve, regeneration and selected, can make the chemical fibre dissolving pulp after bleaching, copy slurry and baking step.
The preparation method's of this pulp for chemical fabrics advantage is that it becomes high temperature, high pressure, violent chemical change in the digestion process into comparatively the physical dissolution process that relaxes, and cuts down the consumption of energy on can be largely.Make more environmental protection of whole process of production, safe, controlled.Simultaneously, because there is not violent cooking reaction in this method in implementation process,, make green, environmental protection, the sustainable possibility that becomes in the production so avoided the generation of black liquor completely.In addition, differ greatly, be difficult to guarantee the characteristics of finished product pulp stable polymerization degree, homogeneous, can make it to carry out suitable falling and gather the homogeneous that guarantees the degree of polymerization by adjust time that the stalk smalls dissolves in ionic liquid for the straw degree of polymerization.The stalk cellulose that experiment showed, higher degrees of polymerization is dissolved in the ionic liquid, and its degree of polymerization can reduce along with the prolongation of constant temperature dissolution time.
Embodiment
Below in conjunction with the specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1: earlier cotton stalk is crushed to the smalls of 50-200 order size, then these smalls is dried 10h down at 105 ℃, the moisture content of stalk is dropped to below 1%.
Purify the relatively mass ratio that is warming up to the lyate ion liquid 1-butyl 3-methylimidazole chlorate 5.2% after 90 ℃ of the cotton stalk smalls of above-mentioned oven dry is added to fall in poly-jar and mixes fully, and, make its sufficient swelling at 95 ℃ of dipping 80min down.Start agitator then and stir material and elevated temperature to 110 ℃ gradually with the rotating speed of 660r/min, being evacuated to vacuum simultaneously reaches-0.085--0.1MPa, keep this temperature and vacuum, can constantly remove the air in the cotton stalk smalls and cellulose is constantly dissolved, behind the 5h, cellulose in the stalk dissolves fully, and to have generated viscosity thus be the bubble-free solution of 160Pa.S.
Batch turning is to the soft water pond poly-jar from falling with the no bubble solution that makes, and stalk cellulose is suspended in the soft water pond with regard to the regeneration cellulose like this, and other lignin, ash, iron etc. are not tolerant then to be sunken at the bottom of the pond.The two is separated, just the slurry of the cotton stalk cellulose that can obtain choosing.Slurry with soft water washing six times, is thoroughly removed lyate ion liquid.
Add mass concentration 7% bleaching liquid in cotton stalk cellulose slurry, whole slurry temperature is 50 ℃, and bleaching time 90min gets final product.Copy slurry then and handle and dry, obtain the stalk pulp.Index sees the following form:
| Sequence number | Project name | Unit | Grade A | The sample index |
| 1 | Alpha cellulose | ％，≥ | 90 | 91 |
| 2 | Ash content | ％，≤ | 0.30 | 0.21 |
| 3 | The iron branch | mg/kg，≤ | 180 | 143 |
| 4 | Viscosity | mpa.s | 10.5±1.0 | 10.1 |
| 5 | Whiteness | ％，≥ | 68 | 70 |
| 6 | Reactivity worth | s，≤ | 250 | 24 |
Embodiment 2: earlier the soybean bar is crushed to the smalls of 50-200 order size, then these smalls is dried 9h down at 105 ℃, the moisture content of soybean bar is dropped to below 1%.
The mass ratio that the soybean bar smalls of above-mentioned oven dry is warming up to the lyate ion liquid 1-butyl 3-methylimidazole chlorate 7.5% after 90 ℃ with relative purification adds in the common dissolution kettle and mixes fully, and under 95 ℃, soak 30min, make its sufficient swelling.Start agitator then and stir material and elevated temperature to 105 ℃ gradually with the rotating speed of 300r/min, being evacuated to vacuum simultaneously reaches-0.085--0.1MPa, keep this temperature and vacuum, can constantly remove the air in the soybean bar smalls and cellulose is constantly dissolved, cellulose behind the 4h in the soybean bar dissolves fully, and to have generated viscosity thus be the bubble-free solution of 350Pa.S.
Slowly batch turning is to the soft water pond from dissolution kettle with the no bubble solution that makes, and the limit edged stirs such soybean rod fibers element and is suspended in the soft water pond with regard to the regeneration cellulose, and its ash, iron etc. are not tolerant then to be sunken at the bottom of the pond.The two is separated the slurry of the soybean rod fibers element that just can obtain choosing.Slurry is cleaned the influence of removing survivor ion liquid to subsequent technique five times with soft water.
Slurry to soybean rod fibers element carries out just can copying the slurry processing then after the common process bleaching, obtains soybean bar pulp eventually.
Embodiment 3: earlier corn stalk is crushed to the smalls of 50-200 order size, then these smalls is dried 8h down at 105 ℃, the moisture content of cornstalk is dropped to below 2%.
The mass ratio that the cornstalk smalls of above-mentioned oven dry is warming up to the lyate ion liquid 1-butyl 3-methylimidazole chlorate 11% after 90 ℃ with relative purification adds in the common dissolution kettle and mixes fully, and under 95 ℃, soak 30min, make its sufficient swelling.Start agitator then and stir material and elevated temperature to 115 ℃ gradually with the rotating speed of 200r/min, being evacuated to vacuum simultaneously reaches-0.085--0.1MPa, keep this temperature and vacuum, can constantly remove the air in the cornstalk smalls and cellulose is constantly dissolved, cellulose behind the 4h in the cornstalk dissolves fully, and to have generated viscosity thus be the bubble-free solution of 320Pa.S.
Slowly batch turning is to the soft water pond from dissolution kettle with the no bubble that makes, and the limit edged stirs such cornstalk fiber element and is suspended in the soft water pond with regard to the regeneration cellulose, and its ash, iron etc. are not tolerant then to be sunken at the bottom of the pond.The two is separated the slurry of the cornstalk fiber element that just can obtain choosing.Slurry is cleaned the influence of removing survivor ion liquid to subsequent technique four times with soft water.
Slurry to the cornstalk fiber element carries out just can copying the slurry processing then after the common process bleaching, obtains the cornstalk pulp eventually.
Claims (8)
1. the preparation method of a pulp for chemical fabrics is characterized in that: comprise the cellulosic dissolving step that adopts in the ionic liquid dissolving straw, with will dissolve cellulose regeneratedly carry out selected regeneration and selected step after becoming cellulose.
2. the preparation method of pulp for chemical fabrics according to claim 1, it is characterized in that: described dissolving step is to adopt the straw smalls to mix with the mass ratio of relative ionic liquid 4%-18%, soak 30-120min down at 90 ℃-98 ℃, stir also afterwards and be warming up to 105-115 ℃ gradually, vacuumize simultaneously, obtaining viscosity is the no bubble solution of 160-1200Pa.S.
3. as the preparation method of pulp for chemical fabrics as described in the claim 2, it is characterized in that: adopt earlier ionic liquid is purified and be heated to 90 ℃ after mixes with the straw smalls again.
4. as the preparation method of pulp for chemical fabrics as described in the claim 2, it is characterized in that: described regeneration and selected step be with the slow batch turning of no bubble solution to soft water and stir the regeneration cellulose, then the regenerated cellulose that will obtain adopt after the soft water washing the slurry of cellulose content 〉=90%.
5. as the preparation method of pulp for chemical fabrics as described in the claim 4, it is characterized in that: the cellulose to regeneration adopts soft water washing 4-6 time.
6. the preparation method of pulp for chemical fabrics according to claim 1, it is characterized in that: need to carry out earlier material preparation step before the described dissolving step, material preparation step is that to select the degree of polymerization for use be the smalls that the straw of 400-2000 is ground into 50-200 order size, dry 8-12h down at 100-110 ℃ then, oven dry back stalk moisture content≤2%.
7. the preparation method of pulp for chemical fabrics according to claim 1, it is characterized in that: described ionic liquid is made up of CATION and anion, and CATION is one or more in the following CATION:
Alkyl ammonium cation Wan Ji phosphonium cation N, N '-dialkylimidazolium CATION N-alkyl pyridine CATION
Anion is CI
-, BF
4 -, PF
4 -, SCN
-, CF
3SO
3 -, CF
3COO
-, (CF
3SO
2)
2N
-(CF
3SO
2)
2C
-In one or more.
8. as the preparation method of each pulp for chemical fabrics in the claim 1 to 7, it is characterized in that: through regeneration and selected step slurry is carried out blanching step, copy slurry then and handle, make pulp for chemical fabrics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101604639A CN101418470A (en) | 2008-11-15 | 2008-11-15 | Method for preparing pulp for chemical fabrics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101604639A CN101418470A (en) | 2008-11-15 | 2008-11-15 | Method for preparing pulp for chemical fabrics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101418470A true CN101418470A (en) | 2009-04-29 |
Family
ID=40629463
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|---|---|---|---|
| CNA2008101604639A Pending CN101418470A (en) | 2008-11-15 | 2008-11-15 | Method for preparing pulp for chemical fabrics |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105392929A (en) * | 2013-04-04 | 2016-03-09 | 阿尔托大学基金会 | Process for the production of shaped cellulose articles |
-
2008
- 2008-11-15 CN CNA2008101604639A patent/CN101418470A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105392929A (en) * | 2013-04-04 | 2016-03-09 | 阿尔托大学基金会 | Process for the production of shaped cellulose articles |
| CN105392929B (en) * | 2013-04-04 | 2020-09-11 | 阿尔托大学基金会 | Method for producing shaped cellulose articles |
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