CN101067287A - Producing technology for microcrystalline cellulose with waste acid cotton linter - Google Patents
Producing technology for microcrystalline cellulose with waste acid cotton linter Download PDFInfo
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- CN101067287A CN101067287A CN 200710111711 CN200710111711A CN101067287A CN 101067287 A CN101067287 A CN 101067287A CN 200710111711 CN200710111711 CN 200710111711 CN 200710111711 A CN200710111711 A CN 200710111711A CN 101067287 A CN101067287 A CN 101067287A
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Abstract
The process of producing microcrystalline cellulose with waste acid lint includes the steps of: soaking, eliminating residue, bleaching, washing, eliminating residue for the second time, concentrating and dewatering, drying, and sieving. The bleaching procedure is one three section one, and uses one of chlorine dioxide, ozone and hydrogen peroxide as the bleaching agent and alkali as the neutralizing agent. The bleaching procedure has low water consumption, less waste drainage, selective elimination of pigment and impurity in fiber and less damage to fiber, and the bleached product has low viscosity, high whiteness, high cellulose content, raised chemical reaction activity, high product quality and wide application range.
Description
Technical field:
The present invention relates to a kind of production technology of making microcrystalline cellulose with waste acid cotton linter.
Background technology:
At present in the cotton seed process, have a large amount of pulverulent waste acid cotton linters to produce since in the waste acid cotton linter residual effect of sulfuric acid not only smell is pungent but also be easy to fly away with the wind contaminated environment everywhere.Be taken as the buried or burning disposal of discarded object for a long time, to the growths of crops, all can produce totally unfavorable influence to atmospheric environment.In recent years, the development and use of waste acid cotton linter have caused that people pay close attention to more, in the development and use waste acid cotton linter, how effectively control and reduce waste acid cotton linter significantly and process the secondary pollution that environment is caused should be familiar with this problem from recycling economy STRATEGIES OF SUSTAINABLE DEVELOPMENT height.
Chinese patent publication number CN1081185A, name is called: " using technology for producing microcrystalline cellulose with sulfated waste cotton velvet ", introduced a kind of process of bleaching, drying, pulverize, sieve with neutralization, degraded; Chinese patent publication number CN1220271A, name is called: " making the production method of microcrystalline cellulose with sulfated waste cotton velvet ", introduced a kind of process with ageing, washing, bleaching, dechlorination, oven dry, crushing screening, test package.Wherein the bleaching agent of bleaching process use is chlorine-containing compound, and as clorox or calcium hypochlorite, bleaching effluent can produce serious pollution to environment and water source.
In the waste acid cotton linter process, a very important link is bleached exactly and is cleaned, above-mentioned bleaching process is many chlorine bleachs, bleaching agent is elemental chlorine or chlorine-containing compound, as hypochlorite, comprise clorox, calcium hypochlorite, contain extremely toxic substance in its bleaching effluent, and contain a large amount of adsorbable organic halogenes, will produce serious pollution to environment especially water source.
As far back as late 1980s, developed country just begins to replace chlorine as bleaching agent with chlorine dioxide, be called element chlorine free bleaching, be called for short ECF, progressively adopt ozone, hydrogen peroxide as bleaching agent on this basis again, be called total chlorine free bleaching, be called for short TCF, the discharge capacity of strict restriction organohalogen compounds.
China also payes attention to the harm of organohalogen compounds since calendar year 2001, and with the discharging of limiting the quantity of of organohalogen compounds as with reference to index, and progressively excessively be controlling index.The clearer production technology of bleaching process requires that cancellation as far as possible is low densely bleaches under 3.5%～6% condition, dense 7%～15% and high dense in 25%～30% bleaching in the realization; Realizing few chlorine or chlorine-free bleaching, is to reduce the consumption of water, to reduce the pollution of bleaching effluent; Reduce bleaching agent, auxiliary agent consumption, improving the quality of products is final purpose.
Summary of the invention:
The object of the present invention is to provide a kind of, to contain few chlorine or bleaching process is carried out in the chlorine-free bleaching agent, can reduce the consumption of water significantly, reduce bleaching effluent, and can process the production technology with waste acid cotton linter manufacturing microcrystalline cellulose of better quality product environment and pollution of waterhead.
Processing step of the present invention is as follows:
A, immersion: waste acid cotton linter sent into add water in the fermentation vat and carry out immersion treatment, fully stir then, concentration of slurry is done pre-bleaching to waste acid cotton linter and is handled 30～60 minutes time below 7%;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopt slag remover to be not less than 0.3MPa at inlet pressure and carry out the eddy flow removal of impurities, the impurity in the waste acid cotton linter is removed in the screen centrifuge removal of impurities of also available 0.8～2mm aperture;
C, bleaching: use a kind of in chlorine dioxide, ozone, the hydrogen peroxide as bleaching agent, alkali is as neutralizer, and to adopt chlorine dioxide stage+alkali section+chlorine dioxide stage be that DED, chlorine dioxide stage+alkali section+ozone stage are that DEZ, hydrogen peroxide section+alkali section+ozone stage are that wherein a kind of of PEZ carries out the syllogic bleaching
Described bleaching agent concentration: 0.5%～10%, consumption: 2～30kg/t slurry; Alkali consumption: 1～5kg/t slurry; Temperature: 40～100 ℃,
Described waste acid cotton linter slurry concentration: 7%～30%, be preferably: 25%～30%,
The described tri-stage bleaching processing time is:
DED: chlorine dioxide stage: 30～60 minutes, the alkali section: 5～15 minutes, chlorine dioxide stage: 60～120 minutes,
DEZ: chlorine dioxide stage: 30～60 minutes, the alkali section: 5～15 minutes, ozone stage: 60～120 minutes,
PEZ: hydrogen peroxide section: 30～60 minutes, the alkali section: 5～15 minutes, ozone stage: 60～120 minutes,
Fully stir in the described bleaching process,
D, rinsing: the slurry after the dilute with water bleaching, rinsing is 2 times in rinsing bath, and water consumption is 10～20 times of waste acid cotton linter weight;
E, secondary slagging-off: adopt scummer to be not less than 0.3MPa and carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure;
F, thickening: use Water Extraction Machinery, make the slurry moisture content less than 40%;
G, drying: adopt drying equipment, 50～200 ℃ of bake out temperatures are to extremely moisture≤5% of slurry continuous drying that dewaters;
H, classification are sieved: with the microcrystalline cellulose of drying, sieve by different product requirement classifications, mesh size is: 50～300 microns, and quantitative package then.
The waste liquid of the discharge among above-mentioned bleaching process c, the rinsing process d preferably adds next round and soaks that the soak as next round recycles among the operation a.
Alkali in the above-mentioned bleaching process can be a kind of in NaOH, sodium carbonate, the sodium bicarbonate.
Adopt scummer to be preferably difunctional high-efficiency cyclone scummer in the above-mentioned secondary deslagging process.
Water Extraction Machinery in the above-mentioned thickening technology is preferably vacuum hydroextractor.
Above-mentioned drying equipment is preferably the hot air circulation pneumatic conveying dryer.
Compared with prior art, this technology of the present invention is used for reference the modern bleaching technology of paper industry, bleaching is dense or high dense fiber bleached in being under the dense condition of step-down, adopt few chlorine or chlorine-free bleaching, this technology has reduced the consumption of rinse water, reduce the consumption of bleaching agent and auxiliary agent, energy-saving and emission-reduction, the generation that reduces even stop the AOX nuisance significantly, whole technical process water, take countercurrent washing to recycle, not only bleaching agent consumption is few, and product whiteness is also higher, but also has reduced the difficulty of subsequent wash, also reduce discharged waste water when having significantly reduced the consumption of water, helped qualified discharge.Simultaneously, the bleaching agent of this process using, can remove pigment and impurity on the fiber selectively, and it is very little to the fiber itself injury, the product of bleaching is viscosity height, whiteness height, content of cellulose height not only, and chemical reactivity also is improved the also corresponding raising of product specification, widened the Application Areas of product, the economic benefit social benefit is very remarkable.
The specific embodiment:
Embodiment 1:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 10 changes, make in the pond concentration of slurry 6%, waste acid cotton linter is done pre-bleaching handle 60 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopting slag remover is that 0.3MPa carries out the eddy flow removal of impurities at inlet pressure, with centrifugal de-burring machine 0.8mm aperture screen centrifuge, removes the impurity in the waste acid cotton linter;
C, bleaching: waste acid cotton linter slurry concentration: 8%, use chlorine dioxide as bleaching agent, NaOH is as neutralizer, and employing DED (chlorine dioxide stage+alkali section+chlorine dioxide stage) carries out tri-stage bleaching, bleaching agent concentration: 0.6%, consumption: 5kg/t slurry; Sodium hydroxide concentration: 2kg/t slurry; Temperature: 50 ℃, mixing speed per minute 10 changes;
Above-mentioned tri-stage bleaching is treated to:
DED: chlorine dioxide stage: 30 minutes, the alkali section: 5 minutes, chlorine dioxide stage: 60 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing is 2 times in rinsing bath, and water consumption is 12 times of waste acid cotton linter weight;
E, secondary slagging-off:
Adopt difunctional high-efficiency cyclone scummer, adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.3MPa;
F, thickening: use vacuum hydroextractor under 0.07MPa pressure, to dewater, make slurry moisture content 35%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 200 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 5%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 60 microns, quantitative package then.
Embodiment 2:
A, immersion: waste acid cotton linter sent into carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, and stir then, mixing speed per minute 15 changes, make concentration of slurry 5%, waste acid cotton linter is done pre-bleaching handle 30 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopt slag remover to carry out the eddy flow removal of impurities,, remove the impurity in the waste acid cotton linter with centrifugal de-burring machine 1mm aperture screen centrifuge at inlet pressure 0.5MPa;
C, bleaching: waste acid cotton linter slurry concentration: 10%, use ozone as bleaching agent, sodium carbonate is as neutralizer, and employing DEZ (chlorine dioxide stage+alkali section+ozone stage) carries out tri-stage bleaching, bleaching agent concentration: 0.7%, consumption: 10kg/t slurry; Sodium carbonate amount: 1kg/t slurry; Temperature: 70 ℃, stir, mixing speed per minute 20 changes,
Above-mentioned tri-stage bleaching is treated to:
DEZ: chlorine dioxide stage: 50 minutes, the alkali section: 10 minutes, ozone stage: 80 minutes
D, rinsing: the slurry after the dilute with water bleaching, rinsing is 2 times in rinsing bath, and water consumption is 10 times of waste acid cotton linter weight;
E, secondary slagging-off: adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.6MPa;
F, thickening: use Water Extraction Machinery, make slurry moisture content 20%;
G, drying: adopt drying equipment, 60 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%;
H, classification are sieved: with the microcrystalline cellulose of drying, sieve by different product requirement classifications, mesh size is: 80 microns, and quantitative package then.
Embodiment 3:
A, immersion: waste acid cotton linter sent into carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, and stir then, mixing speed per minute 30 changes, make concentration of slurry 4%, waste acid cotton linter is done pre-bleaching handle 40 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopt slag remover to be not less than 0.4MPa and carry out the eddy flow removal of impurities,, remove the impurity in the waste acid cotton linter with centrifugal de-burring machine 1.5mm aperture screen centrifuge at inlet pressure;
C, bleaching: waste acid cotton linter slurry concentration: 15%, use hydrogen peroxide as bleaching agent, sodium bicarbonate is as neutralizer, and adopt PEZ (hydrogen peroxide section+alkali section+ozone stage) to carry out tri-stage bleaching, bleaching agent concentration: 20%, use hydrogen peroxide as bleaching agent, sodium bicarbonate is as neutralizer, and adopt PEZ (hydrogen peroxide section+alkali section+ozone stage) to carry out tri-stage bleaching, bleaching agent concentration: 1%, consumption: 15kg/t slurry; Sodium bicarbonate consumption: 3kg/t slurry; Temperature: 80 ℃, stir, mixing speed per minute 30 changes;
Above-mentioned tri-stage bleaching is treated to:
PEZ: hydrogen peroxide section: 60 minutes, the alkali section: 15 minutes, ozone stage: 100 minutes
D, rinsing: the slurry after the dilute with water bleaching, rinsing is 2 times in rinsing bath, and water consumption is 15 times of waste acid cotton linter weight;
E, secondary slagging-off: adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.5MPa;
F, thickening: use vacuum hydroextractor under 0.065MPa pressure, to dewater, make slurry moisture content 25%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 100 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 80 microns, quantitative package then.
Embodiment 4:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 50 changes, make in the pond concentration of slurry 3%, waste acid cotton linter is done pre-bleaching handle 50 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopt slag remover to carry out the eddy flow removal of impurities,, remove the impurity in the waste acid cotton linter with centrifugal de-burring machine 2mm aperture screen centrifuge at inlet pressure 0.6MPa;
C, bleaching: waste acid cotton linter slurry concentration: 20%, as bleaching agent, sodium bicarbonate is as neutralizer, and employing PEZ (hydrogen peroxide section+alkali section+ozone stage) carries out tri-stage bleaching, bleaching agent concentration in the use hydrogen peroxide: 5%, consumption: 20kg/t slurry; Sodium bicarbonate consumption: 5kg/t slurry; Temperature: 60 ℃, stir, mixing speed per minute 70 changes;
Above-mentioned tri-stage bleaching is treated to:
PEZ: hydrogen peroxide section: 30 minutes, the alkali section: 5 minutes, ozone stage: 80 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing is 2 times in rinsing bath, and water consumption is 18 times of waste acid cotton linter weight;
E, secondary slagging-off: adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.35MPa;
F, thickening: use vacuum hydroextractor under 0.055MPa pressure, to dewater, make slurry moisture content 25%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 170 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 2%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 250 microns, quantitative package then.
Embodiment 5:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 70 changes, make in the pond concentration of slurry 2%, waste acid cotton linter is done pre-bleaching handle 60 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopting slag remover is that 0.4MPa carries out the eddy flow removal of impurities at inlet pressure, with centrifugal de-burring machine 1.2mm aperture screen centrifuge, removes the impurity in the waste acid cotton linter;
C, bleaching: waste acid cotton linter slurry concentration: 25%, as bleaching agent, sodium bicarbonate is as neutralizer, and employing PEZ (hydrogen peroxide section+alkali section+ozone stage) carries out tri-stage bleaching, bleaching agent concentration in the use hydrogen peroxide: 6%, consumption: 25kg/t slurry; Sodium bicarbonate consumption: 4kg/t slurry; Temperature: 40 ℃, stir, mixing speed per minute 50 changes;
Above-mentioned tri-stage bleaching is treated to:
PEZ: hydrogen peroxide section: 40 minutes, the alkali section: 12 minutes, ozone stage: 100 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing twice in rinsing bath, and water consumption is 11 times of waste acid cotton linter weight;
E, secondary slagging-off:
Adopt difunctional high-efficiency cyclone scummer, adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.45MPa;
F, thickening: use vacuum hydroextractor under 0.035MPa pressure, to dewater, make slurry moisture content 10%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 120 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 300 microns, quantitative package then.
Embodiment 6:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 20 changes, make in the pond concentration of slurry 1%, waste acid cotton linter is done pre-bleaching handle 45 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopting slag remover is that 0.25MPa carries out the eddy flow removal of impurities at inlet pressure, with centrifugal de-burring machine 1.8mm aperture screen centrifuge, removes the impurity in the waste acid cotton linter;
C, bleaching: waste acid cotton linter slurry concentration: 28%, use chlorine dioxide as bleaching agent, NaOH is as neutralizer, and employing DED (chlorine dioxide stage+alkali section+chlorine dioxide stage) carries out tri-stage bleaching, bleaching agent concentration: 9%, consumption: 3kg/t slurry; Sodium hydroxide concentration: 3kg/t slurry; Temperature: 90 ℃, mixing speed per minute 60 changes;
Above-mentioned tri-stage bleaching is treated to:
DED: chlorine dioxide stage: 40 minutes, the alkali section: 10 minutes, chlorine dioxide stage: 90 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing twice in rinsing bath, and water consumption is 12 times of waste acid cotton linter weight;
E, secondary slagging-off:
Adopt difunctional high-efficiency cyclone scummer, adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.5MPa;
F, thickening: use vacuum hydroextractor under 0.05MPa pressure, to dewater, make slurry moisture content 10%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 120 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 250 microns, quantitative package then.
Embodiment 7:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 35 changes, make in the pond concentration of slurry 4%, waste acid cotton linter is done pre-bleaching handle 55 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopting slag remover is that 0.35MPa carries out the eddy flow removal of impurities at inlet pressure, with centrifugal de-burring machine 1.5mm aperture screen centrifuge, removes the impurity in the waste acid cotton linter;
C, bleaching: waste acid cotton linter slurry concentration: 26%, use chlorine dioxide as bleaching agent, NaOH is as neutralizer, and employing DED (chlorine dioxide stage+alkali section+chlorine dioxide stage) carries out tri-stage bleaching, bleaching agent concentration: 8%, consumption: 28kg/t slurry; Sodium hydroxide concentration: 4kg/t slurry; Temperature: 70 ℃, mixing speed per minute 40 changes;
Above-mentioned tri-stage bleaching is treated to:
DED: chlorine dioxide stage: 45 minutes, the alkali section: 12 minutes, chlorine dioxide stage: 120 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing twice in rinsing bath, and water consumption is 16 times of waste acid cotton linter weight;
E, secondary slagging-off:
Adopt difunctional high-efficiency cyclone scummer, adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.7MPa;
F, thickening: use vacuum hydroextractor under 0.07MPa pressure, to dewater, make slurry moisture content 15%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 80 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%:
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 200 microns, quantitative package then.
Embodiment 8:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 15 changes, make in the pond concentration of slurry 4%, waste acid cotton linter is done pre-bleaching handle 35 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopting slag remover is that 0.55MPa carries out the eddy flow removal of impurities at inlet pressure, with centrifugal de-burring machine 1.6mm aperture screen centrifuge, removes the impurity in the waste acid cotton linter;
C, bleaching: waste acid cotton linter slurry concentration: 27%, use ozone as bleaching agent, NaOH is as neutralizer, and employing DEZ (chlorine dioxide stage+alkali section+ozone stage) carries out tri-stage bleaching, bleaching agent concentration: 0.7%, consumption: 10kg/t slurry; Sodium hydroxide concentration: 1kg/t slurry; Temperature: 70 ℃, stir, mixing speed per minute 20 changes,
Above-mentioned tri-stage bleaching is treated to:
DEZ: chlorine dioxide stage: 60 minutes, the alkali section: 12 minutes, ozone stage: 120 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing twice in rinsing bath, and water consumption is 16 times of waste acid cotton linter weight;
E, secondary slagging-off:
Adopt difunctional high-efficiency cyclone scummer, adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.7MPa;
F, thickening: use vacuum hydroextractor under 0.04MPa pressure, to dewater, make slurry moisture content 20%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 180 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 70 microns, quantitative package then.
Embodiment 9:
A, immersion: waste acid cotton linter sent into by the positive feed device carry out immersion treatment in the fermentation vat, bleaching liquid that bleaching process is discharged and poaching wastewater add in the fermentation vat and recycle, stir then, mixing speed per minute 35 changes, make in the pond concentration of slurry 2%, waste acid cotton linter is done pre-bleaching handle 40 minutes time;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopting slag remover is that 0.35MPa carries out the eddy flow removal of impurities at inlet pressure, with centrifugal de-burring machine 1.4mm aperture screen centrifuge, removes the impurity in the waste acid cotton linter;
C, bleaching: waste acid cotton linter slurry concentration: 30%, use ozone as bleaching agent, sodium bicarbonate is as neutralizer, and employing DEZ (chlorine dioxide stage+alkali section+ozone stage) carries out tri-stage bleaching, bleaching agent concentration: 0.7%, consumption: 10kg/t slurry; Sodium bicarbonate consumption: 1kg/t slurry; Temperature: 70 ℃, stir, mixing speed per minute 20 changes,
Above-mentioned tri-stage bleaching is treated to:
DEZ: chlorine dioxide stage: 40 minutes, the alkali section: 8 minutes, ozone stage: 100 minutes
D, cleaning: the slurry after the dilute with water bleaching, rinsing twice in rinsing bath, and water consumption is 16 times of waste acid cotton linter weight;
E, secondary slagging-off:
Adopt difunctional high-efficiency cyclone scummer, adopt scummer to carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure 0.7MPa;
F, thickening: use vacuum hydroextractor under 0.06MPa pressure, to dewater, make slurry moisture content 25%;
G, drying: adopt the hot air circulation pneumatic conveying dryer, 110 ℃ of bake out temperatures, to dehydration slurry continuous drying to moisture 4%;
H, classification are sieved: the microcrystalline cellulose classification of drying is sieved, and mesh size is 220 microns, quantitative package then.
Claims (9)
1, a kind of production technology with waste acid cotton linter manufacturing microcrystalline cellulose is characterized in that processing step is as follows:
A, immersion: waste acid cotton linter sent into add water in the fermentation vat and carry out immersion treatment, fully stir then, concentration of slurry is done pre-bleaching to waste acid cotton linter and is handled 30～60 minutes time below 7%;
B, slagging-off: through the waste acid cotton linter that soaks, peel off with all kinds of impurity after the imbibition, adopt slag remover to be not less than 0.3MPa at inlet pressure and carry out the eddy flow removal of impurities, the impurity in the waste acid cotton linter is removed in the screen centrifuge removal of impurities of also available 0.8～2mm aperture;
C, bleaching: use a kind of in chlorine dioxide, ozone, the hydrogen peroxide as bleaching agent, alkali is as neutralizer, and to adopt chlorine dioxide stage+alkali section+chlorine dioxide stage be that DED, chlorine dioxide stage+alkali section+ozone stage are that DEZ, hydrogen peroxide section+alkali section+ozone stage are that wherein a kind of of PEZ carries out the syllogic bleaching
Described bleaching agent concentration: 0.5%～10%, consumption: 2～30kg/t slurry; Alkali consumption: 1～5kg/t slurry; Temperature: 40～100 ℃,
Described waste acid cotton linter slurry concentration: 7%～30%,
The described tri-stage bleaching processing time is:
DED: chlorine dioxide stage: 30～60 minutes, the alkali section: 5～15 minutes, chlorine dioxide stage: 60～120 minutes,
DEZ: chlorine dioxide stage: 30～60 minutes, the alkali section: 5～15 minutes, ozone stage: 60～120 minutes,
PEZ: hydrogen peroxide section: 30～60 minutes, the alkali section: 5～15 minutes, ozone stage: 60～120 minutes,
Fully stir in the described bleaching process,
D, rinsing: the slurry after the dilute with water bleaching, rinsing is 2 times in rinsing bath, and water consumption is 10～20 times of waste acid cotton linter weight;
E, secondary slagging-off: adopt scummer to be not less than 0.3MPa and carry out the eddy flow removal of impurities, further purify the tiny weight impurity of removing in the slurry at inlet pressure;
F, thickening: use Water Extraction Machinery, make the slurry moisture content less than 40%;
G, drying: adopt drying equipment, 50～200 ℃ of bake out temperatures are to extremely moisture≤5% of slurry continuous drying that dewaters;
H, classification are sieved: with the microcrystalline cellulose of drying, sieve by different product requirement classifications, mesh size is: 50～300 microns, and quantitative package then.
2, the production technology with waste acid cotton linter manufacturing microcrystalline cellulose as claimed in claim 1 is characterized in that described soaking technology a: the bleaching waste liquor adding that will discharge among the last round of bleaching process c is soaked among the operation a and is recycled.
3, the production technology with waste acid cotton linter manufacturing microcrystalline cellulose as claimed in claim 1 is characterized in that described soaking technology a: the waste water adding that will discharge in the last round of rinsing process is soaked among the operation a and is recycled.
4, as claim 1 or 2 or 3 described production technologies with waste acid cotton linter manufacturing microcrystalline cellulose, it is characterized in that described bleaching process: the waste acid cotton linter slurry concentration is: 25%～30%.
5, describedly make the production technologies of microcrystalline cellulose as claim 1 or 2 or 3, it is characterized in that a kind of for in NaOH, sodium carbonate, the sodium bicarbonate of alkali in the described bleaching process with waste acid cotton linter.
6, as claimed in claim 4ly make the production technology of microcrystalline cellulose, it is characterized in that a kind of for in NaOH, sodium carbonate, the sodium bicarbonate of alkali in the described bleaching process with waste acid cotton linter.
7, as claim 1 or the 2 or 3 described production technologies of making microcrystalline cellulose with waste acid cotton linter, it is characterized in that adopting scummer in the described secondary deslagging process is multifunctional efficient eddy flow scummer, Water Extraction Machinery in the thickening technology is a vacuum hydroextractor, and drying equipment is the hot air circulation pneumatic conveying dryer.
8, the production technology of making microcrystalline cellulose with waste acid cotton linter as claimed in claim 4, it is characterized in that adopting scummer in the described secondary deslagging process is multifunctional efficient eddy flow scummer, Water Extraction Machinery in the thickening technology is a vacuum hydroextractor, and drying equipment is the hot air circulation pneumatic conveying dryer.
9, the production technology of making microcrystalline cellulose with waste acid cotton linter as claimed in claim 5, it is characterized in that adopting scummer in the described secondary deslagging process is multifunctional efficient eddy flow scummer, Water Extraction Machinery in the thickening technology is a vacuum hydroextractor, and drying equipment is the hot air circulation pneumatic conveying dryer.
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| CN2007101117116A CN101067287B (en) | 2007-05-31 | 2007-05-31 | Producing technology for microcrystalline cellulose with waste acid cotton linter |
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| CN2007101117116A CN101067287B (en) | 2007-05-31 | 2007-05-31 | Producing technology for microcrystalline cellulose with waste acid cotton linter |
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| CN101067287B CN101067287B (en) | 2011-07-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368347B (en) * | 2008-09-12 | 2010-12-15 | 王跃成 | Technique for producing mlcrocrystalline cellulose by sulfated waste velveteen |
| CN101649569B (en) * | 2009-09-01 | 2011-05-18 | 陕西科技大学 | Process for preparing low-pollution wheatgrass microcrystalline cellulose |
| CN102808347A (en) * | 2012-08-16 | 2012-12-05 | 杜俊琪 | Preparation method for microcrystalline cellulose |
| CN103087204A (en) * | 2011-10-28 | 2013-05-08 | 上海同化新材料科技有限公司 | Micro-powder cellulose preparation method |
| CN102027167B (en) * | 2008-05-13 | 2013-06-12 | 美佐纸业股份有限公司 | Method of bleaching pulp with ozone, chlorine dioxide and peroxide |
| CN115121382A (en) * | 2022-05-06 | 2022-09-30 | 浙江上方生物科技有限公司 | Impurity removing device for natural seaweed microcrystalline cellulose |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4035813A1 (en) * | 1990-11-10 | 1992-05-14 | Akzo Gmbh | OXYGEN BLEACHING |
| CN1037846C (en) * | 1992-07-04 | 1998-03-25 | 苏志刚 | Technology for producing microcrystalline cellulose with sulfated waste cotton velvet |
| CN1075514C (en) * | 1997-10-13 | 2001-11-28 | 徐旗开 | Method for producing microcrystalline cellulose by sulfating waste cotton velvet |
| EP1263792A1 (en) * | 2000-03-09 | 2002-12-11 | Hercules Incorporated | Stabilized microfibrillar cellulose |
| CN1754891A (en) * | 2004-09-30 | 2006-04-05 | 井明辉 | Raw material for producing low-viscosity carboxymethyl cellulose and its production method |
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2007
- 2007-05-31 CN CN2007101117116A patent/CN101067287B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102027167B (en) * | 2008-05-13 | 2013-06-12 | 美佐纸业股份有限公司 | Method of bleaching pulp with ozone, chlorine dioxide and peroxide |
| CN101368347B (en) * | 2008-09-12 | 2010-12-15 | 王跃成 | Technique for producing mlcrocrystalline cellulose by sulfated waste velveteen |
| CN101649569B (en) * | 2009-09-01 | 2011-05-18 | 陕西科技大学 | Process for preparing low-pollution wheatgrass microcrystalline cellulose |
| CN103087204A (en) * | 2011-10-28 | 2013-05-08 | 上海同化新材料科技有限公司 | Micro-powder cellulose preparation method |
| CN103087204B (en) * | 2011-10-28 | 2015-07-01 | 上海同化新材料科技有限公司 | Micro-powder cellulose preparation method |
| CN102808347A (en) * | 2012-08-16 | 2012-12-05 | 杜俊琪 | Preparation method for microcrystalline cellulose |
| CN115121382A (en) * | 2022-05-06 | 2022-09-30 | 浙江上方生物科技有限公司 | Impurity removing device for natural seaweed microcrystalline cellulose |
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