CN1445412A - Pulping method of non-wood fibers with no black liquor drained off as well as its boiler - Google Patents
Pulping method of non-wood fibers with no black liquor drained off as well as its boiler Download PDFInfo
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Abstract
A process for preparing the pulp of non-woven fibres without black liquid drainage includes such steps as adding raw fibres and acetic acid into the enclosed digester, heating, holding the temp for a certain time, filtering to obtain waste acidic liquid, pumping it to waste acid tank, adding the washing alcohol solution, heating, holding the temp for a certain time, filtering the waste acid-alcohol solution, pumping it to waste acid-alcohol tank, washing fibres with clean alcohol, draining the washing liquid to waste liquid tank, stripping alcohol from fibres by low-pressure steam, adding hot water to digester, and discharging raw pulp. Said digester has a jacket with steam inlet and condensed water outlet and a filter net at the discharge port.
Description
One, technical field
The present invention relates to a kind of pulping and papermaking method and equipment thereof, particularly, make lignin and part hemicellulose be dissolved in cooking liquor, and separate with cellulose about acetate and ethanol associating boiling non-wood fibrous raw material.Utilize the characteristics that these solvents are easy to volatilize in the black liquor again, can reclaim and recycle through distillation, lignin and hemicellulose are then collected with the form of solid, thereby have realized cleaning pulping process and corresponding boiling vessel that foul gass such as no black liquor and hydrogen sulfide, mercaptan discharge.
Two, background technology
Two existing big chemical pulping methods: sulfate process and sulphite process were developed so far before more than 100 years, did not have much variations basically.With regard to the sulfate process of representational chemical pulping, roughly process is: add the aqueous solution of fibrous raw material, caustic soda, vulcanized sodium in autoclave, control certain liquor ratio, at 170-190 ℃ of high temperature, 7-9kg/cm
2Under the pressure boiling 3-4 hour, obtain paper pulp.Black liquor in the paper pulp through the extraction of a series of complex processes, concentrate, burning, causticization and reclaim steaming preparation.There is following problem in such pulping process: owing to used the vulcanized sodium medicament, can produce foul gass such as hydrogen sulfide, mercaptan, sulfur dioxide in boiling, generation has a strong impact on to atmospheric environment; Owing to adopt the High Temperature High Pressure boiling, lignin produces rotten, causes the bleaching difficulty, for obtaining the paper pulp of high whiteness, needs to carry out multistage bleaching with chlorine bleaches, can generate the harmful substance organic chloride in this process, water environment is caused have a strong impact on; Used a large amount of medicaments such as alkali in the boiling, needed from black liquor, to be reclaimed, need for this reason with black liquor concentrate, burning, causticization etc., this must use complexity, huge equipment, causes the equipment investment expense to increase; Simultaneously, the concentrated a large amount of water of evaporation that needs of black liquor, energy consumption is very high; Precious resources such as the lignin in the black liquor only are used with the form of heat energy in this process, and added value is not high.And alkali recovery equipment is not then established in most of middle-size and small-size paper mills, particularly straw pulp class paper mill, and whole black liquor are emitted, and causes the severe contamination in waters.
For solving the problem that above-mentioned chemical pulping exists, countries in the world have been carried out the exploitation of solvent pulping technique actively, be characterized in utilizing some organic solvents feature of dissolved lignin and part hemicellulose selectively, thereby lignin is separated with cellulose, solvent reclaims and recycles through distillation, remaining solid shape lignin and hemicellulose or as industrial chemicals and agricultural goods, materials and equipments, or send boiler combustion, utilize its heat energy.The organic solvent latent heat of vaporization is than water much lower (for example, the acetate latent heat of vaporization is 97.1cal/g, and water is 540cal/g), and the energy consumption of solvent distillation is well below the concentrated energy consumption of black liquor vaporizing.Just realized nuisanceless slurrying by solvent boiling mode.Present representational solvent pulp-making method has pulping process, pulping process that uses phenols that uses alcohols and the pulp-making method that uses the organic acid medicament etc.The having of using of having put into production be Canadian uses pure ALCELL method as steaming preparation etc.The alcohols pulp-making method makes a large amount of fresh ethanol contact with raw material, and energy consumption is very high.In addition, slurrying is to carry out under High Temperature High Pressure, and is quite tight to the requirements such as sealing of equipment; When phenols slurrying is used, might cause the toxicity problem of phenol in large-scale production.
Japanese patent laid-open 4-300379 employing (0.05-0.2%) hydrochloric acid is that the 80-97% concentration propionic acid solution of catalyst carries out the delignification slurrying of coniferous tree wood chip and broad leaf tree wood chip under normal pressure.With decantation separation solution layer, use aqueous acetone (90%) earlier through the wood chip that boiling is handled after the boiling, the reusable heat water washing dissociates into paper pulp through making beating.
Cooking waste liquor reclaims propionic acid through decompression distillation, is injected in the water of 20 times of amounts when being concentrated to 1/10 volume, lignin precipitation, hemicellulose are dissolved in the liquid and are separated from each other.Thereby realized being separated from each other of nuisanceless slurrying and cellulose, lignin, hemicellulose.Used a large amount of acetone solns in the washing that this method weak point is a paper pulp, reclaimed trouble, and will consume more energy, cooking waste liquor injects 20 times of water precipitate and separate lignins after being concentrated into finite concentration, has produced a large amount of rare propionic acid liquid.The recovery energy consumption height of this part rare propionic acid.Therefore the cost of method medicament recovery is higher; Use hydrochloric acid to be catalyst, increased the content of organic chloride in the corrosion of equipment and the washes, environment has been caused harmful effect.
Three, summary of the invention:
The objective of the invention is to overcome the deficiencies in the prior art, design a kind of non-wood-fiber and do not have black liquor discharging pulping process and corresponding boiling vessel thereof.
The present invention is achieved in that
A kind of non-wood-fiber does not have black liquor discharging pulping process, it is characterized in that:
1. in the airtight boiling vessel of band charging aperture and discharging opening, after charging aperture adds fibrous raw material, add the acetate that concentration is 50-99% again, contain the H of 0.05-0.7% in the acetate
2SO
4Catalyst, the mass ratio of fibrous raw material and acetate is 1: 2-17, then boiling vessel is carried out airtight heating, make the interior temperature of boiling vessel rise to 90-150 ℃ fast, pressure is to stop heating behind the 0-0.8MPa, be incubated 30-180 minute, after temperature retention time finishes, with acid pickle filtration pressure in the boiling vessel to the spent acid groove;
2. then adding concentration in boiling vessel is the front-wheel ethanol cleaning solution of 50-99%, the ratio 1 of fibrous raw material and front-wheel ethanol cleaning solution quality: 2-17, then boiling vessel is heated, make the interior temperature of boiling vessel rise to 60-150 ℃ fast, pressure is to stop heating behind the 0-0.8MPa, be incubated 30-120 minute, after temperature retention time finishes, with acid alcohol waste liquid filtration pressure in the boiling vessel to spent acid alcohol groove;
3. will clean ethanol then sends in the boiling vessel, fiber is fully washed, cleaning solution is displaced into pure scrub raffinate groove, after washing finishes, low-pressure steam is added boiling vessel, and gas is carried the ethanol that adheres on the fiber, and the ethanol that gas proposes is delivered to destilling tower, gas is carried and is finished the back adds 60-86 ℃ in boiling vessel hot water, opens discharging opening and will slightly starch and put into thick stock tank and send next procedure.
Further scheme is: the spent acid in the spent acid groove send evaporimeter, is evaporated to solid content 40-60% and send drier to be dried to thick lignin powder again, and the acetate gas that evaporates at evaporimeter and drier send the acetate groove to use in order to lower whorl after condenser liquefaction.
Further scheme is again: the spent acid alcohol liquid in the spent acid alcohol groove send evaporator evaporation to go out acetate, ethanol, water and enters last destilling tower, the water that last destilling tower steams, ethanol enter back one destilling tower, acetate in the last destilling tower still send the acetate groove, the alcohol gas that back one destilling tower steams send pure groove after condenser liquefaction, discharge of wastewater in the one destilling tower still of back, the dense raffinate that contains solid content 40-60% in the evaporimeter send drier to reclaim acetate and thick lignin powder.
A kind of boiling vessel comprises the closed shell of being with top charging aperture and bottom discharging opening, it is characterized in that: be provided with filter screen at the inner walls periphery that is positioned at discharging opening place, bottom.
The mode of heating of boiling vessel can be multiple modes such as electrical heating, but with the chuck that is provided with band heating steam import and condensation-water drain at housing outer wall periphery to realize that steam heated is for well.
Advantage of the present invention is, uses the acetate and the ethanol associating boiling fiber essence that contain catalyst sulfuric acid to produce chemical pulp, and technical process is simple.Vitriolated acetate carries out removing of lignin by the reaction that depolymerizes of lignin.And the ethyl acetate that ethanol and acetate form under sulfuric acid catalysis has dissolubility preferably to lignin and to the protectiveness of fiber.Therefore, acetate and ethanol associating boiling help removing of lignin and reduce cellulosic degraded very much.Guaranteed that paper pulp has higher yield and high physical strength, bleachability might as well.Contain acetate and ethanol in the associating boiling waste gas.Facilitate a water-ethanol azeotropic point.Be convenient to easier separation of acetate and dehydration.Use pure filtering stock, carry out stripping then, obviously reduced the solvent loss of taking away in the slurry.
The heat of vaporization of acetate and ethanol is more much lower than water: acetate is 97cal/g, and ethanol is 204cal/g, and water is 540cal/g.Therefore the energy loss-rate sulfate process on medicament reclaims is low.On the drying of lignin of the present invention, equipment investment is lacked than combustion furnace and the causticization equipment that the alkali of sulfate process reclaims, and does not have huge waste residue such as causticization white clay and produce, and operates also much easier.The present invention does not use medicaments such as sulfide, so does not have hydrogen sulfide in the digestion process, and foul gass such as mercaptan are thrown into atmosphere.Cooking waste liquor is after evaporative distillation reclaims organic solvent, and thick lignin is collected for utilizing with solid form, no longer includes black liquor and is thrown into water environment.Boiling and washing under the acetate acid condition generally can not form foam, can improve the water filtering performance of paper pulp, and this is for the extraction of black liquor, and evaporation and concentration is very favourable, also helps reducing the pulp washing water consumption.In the associating boiling of acetate and ethanol, silicon is insoluble to acid and remaines in the paper pulp in the fibrous raw material, metal ion then is dissolved in the cooking liquor to be removed from paper pulp, and this is very favourable for peroxide bleaching subsequently: need not use expensive chelating agent to eliminate the adverse effect of metal ion in the bleaching; The silicon that remaines in the paper pulp forms sodium metasilicate in the alkaline peroxide bleaching, do not need to add this bleaching stibilizer during bleaching again.These 2 to reducing bleaching cost, and the yield and the quality that improve bleached pulp all are very useful.Therefore, adopt the associating boiling of acetate and ethanol, be particularly suitable for siliceous high grass as raw material.
Four, accompanying drawing and explanation
Fig. 1 is the process chart of method of the present invention.
Fig. 2 is the generalized section of boiling vessel of the present invention.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the I district amplification view of Fig. 3.
In Fig. 2, Fig. 3 and Fig. 4: 1-charging aperture, 2-alcohol gas outlet, 3-import, 4-leakage fluid dram, 5-discharging opening, the import of 6-low-pressure steam, 7-condensation-water drain, 8, the 9-interface, the import of 10-heating steam, 11-screen cloth, 12-chuck.
Five, implementation
The present invention will be further described below in conjunction with accompanying drawing:
Such as Fig. 1, Fig. 2, Fig. 3 and Fig. 4, add again the acetic acid that concentration is 50-99% from import 3 after 1. in the charging aperture 1 of the special boiling vessel 13 of screen cloth 11 and chuck 12, adding the fibrous raw material that is preset in fibrous raw material storehouse 14, contain the H of 0.05-0.7% in the acetic acid2SO
4Catalyst. The mass ratio of fibrous raw material and acetic acid is 1: 2-17, then add steam to chuck 12 from steam-gas inlet 10, condensation-water drain 7 is discharged steam condensing water, make boiling vessel 13 interior temperature rise to fast 90-150 ℃, pressure is the 0-0.8MPa stopped heating, be incubated 30-180 minute, temperature retention time utilizes boiling vessel 13 internal pressures and outer ftercompction contracting air that boiling vessel 13 interior spent acid are depressed into spent acid groove 18 by screen cloth 11 through leakage fluid dram 4 after finishing.
2. the front-wheel ethanol cleaning solution that then 13 interior adding concentration are 50-99% from import 3 to boiling vessel, fibrous raw material and front-wheel ethanol cleaning solution mass ratio 1: 2-17, add steam from steam-gas inlet 10 and enter chuck 12, steam condensing water is discharged in outlet 7, make temperature rise to fast 150 ℃ of 60-, pressure is the 0-0.8MPa stopped heating, be incubated 30-120 minute, after temperature retention time finishes, utilize pressure and outer ftercompction contracting air in the boiling vessel 13 that the acid alcohol waste liquid is depressed into spent acid alcohol groove 21 by screen cloth 11 through leakage fluid dram 4.
3. send in the boiling vessel 13 from leakage fluid dram 4 with cleaning ethanol, fiber is carried out three countercurrent washings, cleaning solution is discharged from upper inlet 3, delivers to alcohol washing waste liquid tank 16, then with compressed air residual ethanol is delivered to alcohol washing waste liquid tank 16 by screen cloth 11 through leakage fluid dram 4. The purpose one of washing is the residual lignin that adheres to on the flush away fiber, the 2nd, and in order to displace the acetic acid that remains in the fiber with ethanol. After washing finishes, add boiling vessel with low-pressure steam from steam-gas inlet 6, the ethanol that adheres on the air lift fiber, the ethanol that air lift goes out is delivered to destilling tower 24 Recycled ethanols through alcohol gas outlet 2. By the hot water of import 3 86 ℃ of adding 60-in the boiling vessel, open discharging opening 5 and will slightly starch and put into thick stock tank 25 and send next procedure after air lift finishes.
4. the spent acid in the spent acid groove 18 send evaporimeter 19, is evaporated to solid content 40-60% and send drier 20 to be dried to thick lignin powder again. After condenser 27 liquefaction, send acetic acid groove 15 to use in order to lower whorl at the acetic acid gas that evaporimeter 19 and drier 20 evaporate.
5. the spent acid alcohol liquid in the spent acid alcohol groove 21 send evaporimeter 22 to evaporate acetic acid, ethanol, water and enters destilling tower 23, the water that destilling tower 23 steams, ethanol enter destilling tower 24, acetic acid in destilling tower 23 stills send the acetic acid groove 15 reuses, the alcohol gas that destilling tower 24 steams send pure groove 17 reuses after condenser 26 liquefaction, water discharging in destilling tower 22 stills, the dense raffinate that contains solid content 40-60% in the evaporimeter 22 send drier 20 to reclaim acetic acid and lignins, the wherein lignin use that acts as a fuel.
Provide four groups of specific embodiments below again:
Embodiment one:
The cizu bamboo chip (moisture 15.80%) that adds 5.9 kilograms of 20-30 millimeters long in the stainless steel boiling vessel of band screen cloth and chuck, the acetate (being added with the 90ml concentrated sulfuric acid in interior in advance) that to add 25 kilograms of concentration be 911g/L was 120-130 ℃ of boiling 150 minutes.Utilize the pressure in the boiling vessel that black liquor is pressed into the spent acid storage tank.Then in boiling vessel, add 17 kilogram of 90% ethanol, carry out acid alcohol boiling in 60 minutes, utilize the pressure in the boiling vessel that black liquor is pressed in the spent acid alcohol liquid storage tank at 110-120 ℃., carry out altogether three times at 80 ℃ of following adverse current washing pulps with 90% ethanol, each with 17 kilograms of alcohol, scrub raffinate uses when putting into separately storage tank for lower whorl slurrying: one washes waste liquid makes the acid alcohol cooking liquor, and two, three wash waste liquid work one, two washing lotions.Feed the alcohol that adheres on the steam stripped paper pulp in boiling vessel, the alcohol that stripping goes out reclaims through condensation.With the 60-80 ℃ of abundant washing pulp of water, emit boiling vessel then behind the stripping.It is 2.94 kilograms (over dry is heavy) that the paper pulp sampling survey moisture of cleaning is calculated the brown stock amount, and paper pulp yield is 58.8%.The quality testing result such as the following table of paper pulp are listed:
Embodiment two:
| Index name | Unit | Measured value | Test method |
| Quantitatively | ????g/m 2 | ????58.5 | ??QB/T?3704-1999 |
| Tensile index | ????N·m/g | ????66.3 | ??QB/T?3704-1999 |
| Fracture length | ????M | ????6760 | ??QB/T?3704-1999 |
| Burst index | ????KPa·m 2/g | ????4.89 | ??QB/T?3704-1999 |
| Tear index | ????mN·m 2/g | ????10.6 | ??QB/T?3704-1999 |
| Folding strength | Inferior | ????＞500 | ??QB/T?3704-1999 |
Add 3.6 kilograms of Jilin and produce reeds (moisture 13.63%) in the stainless steel boiling vessel of band screen cloth and chuck, the acetate (being added with the 50ml concentrated sulfuric acid in interior in advance) that to add 32 kilograms of concentration be 906g/L was 120-130 ℃ of boiling 120 minutes.Utilize the pressure in the boiling vessel that black liquor is pressed into the spent acid storage tank.Then in boiling vessel, add 12 kilogram of 90% ethanol, carry out acid alcohol boiling in 60 minutes, utilize the pressure in the boiling vessel that black liquor is pressed in the spent acid alcohol liquid storage tank at 110-120 ℃.Follow with hot pure liquid, reusable heat water washing paper pulp, the situation when mode of washing prepares with bamboo pulp is identical, and just the consumption of each alcohol is 12 kilograms.
Paper pulp after the washing, moisture is surveyed in sampling, and calculating slurry-outlet quantity is 1.72 kilograms (over dry is heavy); The brown stock yield is 55.3%.Then brown stock is carried out two sections hydrogen peroxide bleachings, the total consumption of hydrogen peroxide is 69.3g, and being equivalent to the end, to float slurry heavy by 4%.It is heavy to float the back slurry: 1.53 kilograms (over dry is heavy), floating damage is 11.1%, and bleached pulp is 49.2% to the yield of raw material reed, and the quality testing result such as the following table of bleached pulp are listed:
Embodiment three:
| Index name | Unit | Measured value | Test method |
| Quantitatively | ????g/m 2 | ??61.1 | ??QB/T?3704-1999 |
| Tensile index | ????N·m/g | ??34.9 | ??QB/T?3704-1999 |
| Fracture length | ????M | ??3560 | ??QB/T?3704-1999 |
| Burst index | ????KPa·m 2/g | ??2.17 | ??QB/T?3704-1999 |
| Tear index | ????mN·m 2/g | ??4.09 | ??QB/T?3704-1999 |
| Whiteness | ????％ | ??74.1 | ??QB/T?8940.2-1988 |
| Folding strength | Inferior | ??10 | ??QB/T?3704-1999 |
The slurrying of wheat straw, same with reed, the quality testing result of bleached pulp is as follows:
Embodiment four:
| Index name | Unit | Measured value | Test method |
| Quantitatively | ????g/m 2 | ????61.1 | ????QB/T?3704-1999 |
| Tensile index | ????N·m/g | ????41.5 | ????QB/T?3704-1999 |
| Fracture length | ????M | ????4230 | ????QB/T?3704-1999 |
| Burst index | ????KPa·m 2/g | ????2.40 | ????QB/T?3704-1999 |
| Tear index | ????mN·m 2/g | ????3.45 | ????QB/T?3704-1999 |
| Whiteness | ????％ | ????66.2 | ????QB/T?8940.2-1988 |
| Folding strength | Inferior | ????14 | ????QB/T?3704-1999 |
The slurrying of straw and bleaching, same with reed, the result is as follows for the bleached pulp quality testing:
| Index name | Unit | Measured value | Test method |
| Quantitatively | ????g/m 2 | ????58.9 | ????QB/T?3704-1999 |
| Tensile index | ????N·m/g | ????33.7 | ????QB/T?3704-1999 |
| Fracture length | ????M | ????3440 | ????QB/T?3704-1999 |
| Burst index | ????KPa·m 2/g | ????2.01 | ????QB/T?3704-1999 |
| Tear index | ????mN·m 2/g | ????3.46 | ????QB/T?3704-1999 |
| Whiteness | ????％ | ????70.1 | ????QB/T?8940.2-1988 |
| Folding strength | Inferior | ????5 | ????QB/T?3704-1999 |
Claims (5)
1, a kind of non-wood-fiber does not have black liquor discharging pulping process, it is characterized in that:
1. in the airtight boiling vessel (13) of band charging aperture (1) and discharging opening (5), after charging aperture (1) adds fibrous raw material, add the acetate that concentration is 50-99% again, contain the H of 0.05-0.7% in the acetate
2SO
4Catalyst, the mass ratio of fibrous raw material and acetate is 1: 2-17, then boiling vessel (13) is carried out airtight heating, make the interior temperature of boiling vessel (13) rise to 90-150 ℃ fast, pressure is to stop heating behind the 0-0.8MPa, be incubated 30-180 minute, after temperature retention time finishes, with the interior acid pickle filtration pressure of boiling vessel (13) to spent acid groove (18);
2. then adding concentration in boiling vessel (13) is the front-wheel ethanol cleaning solution of 50-99%, the ratio 1 of fibrous raw material and front-wheel ethanol cleaning solution quality: 2-17, then boiling vessel (13) is heated, make the interior temperature of boiling vessel (13) rise to 60-150 ℃ fast, pressure is to stop heating behind the 0-0.8MPa, be incubated 30-120 minute, after temperature retention time finishes, with interior the acid alcohol waste liquid of boiling vessel (13) filtration pressure to the pure groove (21) of spent acid;
3. will clean ethanol then sends in the boiling vessel (13), fiber is fully washed, cleaning solution is displaced into pure scrub raffinate groove (16), after washing finishes, low-pressure steam is added boiling vessel (13), and gas is carried the ethanol that adheres on the fiber, and the ethanol that gas proposes is delivered to destilling tower (24), gas is carried the hot water that finishes back 60-86 ℃ of adding to boiling vessel (13) in, opens discharging opening (5) and will slightly starch and put into thick stock tank (25) and send next procedure.
2, non-wood-fiber according to claim 1 does not have black liquor discharging pulping process, it is characterized in that:
Spent acid in the spent acid groove (18) send evaporimeter (19), be evaporated to solid content 40-60% and send drier (20) to be dried to thick lignin powder again, after condenser (27) liquefaction, send acetate groove (15) to use in order to lower whorl at the acetate gas that evaporimeter (19) and drier (20) evaporate.
3, non-wood-fiber according to claim 1 does not have black liquor discharging pulping process, it is characterized in that: the spent acid alcohol liquid in the spent acid alcohol groove (21) send evaporimeter (22) to evaporate acetate, ethanol, water enters destilling tower (23), the water that destilling tower (23) steams, ethanol enters destilling tower (24), acetate in destilling tower (23) still send acetate groove (15), the alcohol gas that destilling tower (24) steams send pure groove (17) after condenser (26) liquefaction, discharge of wastewater in destilling tower (24) still, the dense raffinate that contains solid content 40-60% in the evaporimeter (22) send drier (20) to reclaim acetate and thick lignin powder.
4, a kind of boiling vessel comprises it is characterized in that the closed shell of band top charging aperture (1) and bottom discharging opening (5): be provided with filter screen (11) being positioned at the inner walls periphery that bottom discharging opening (5) locates.
5, boiling vessel according to claim 4 is characterized in that: the chuck (12) that also is provided with band heating steam import (10) and condensation-water drain (7) at housing outer wall periphery.
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| CN 03117752 CN1214151C (en) | 2003-04-23 | 2003-04-23 | Pulping method of non-wood fibers with no black liquor drained off as well as its boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277760A (en) * | 2011-08-30 | 2011-12-14 | 内蒙古科技大学 | Pre-processing method in process of producing paper pulp |
| CN108221432A (en) * | 2017-12-28 | 2018-06-29 | 潍坊友容实业有限公司 | A kind of process that cellulose is extracted from Suaeda salsa |
| CN108277672A (en) * | 2017-12-28 | 2018-07-13 | 潍坊友容实业有限公司 | A kind of process for extracting plant salt and cellulose from Suaeda salsa |
-
2003
- 2003-04-23 CN CN 03117752 patent/CN1214151C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277760A (en) * | 2011-08-30 | 2011-12-14 | 内蒙古科技大学 | Pre-processing method in process of producing paper pulp |
| CN102277760B (en) * | 2011-08-30 | 2014-05-14 | 内蒙古科技大学 | Pre-processing method in process of producing paper pulp |
| CN108221432A (en) * | 2017-12-28 | 2018-06-29 | 潍坊友容实业有限公司 | A kind of process that cellulose is extracted from Suaeda salsa |
| CN108277672A (en) * | 2017-12-28 | 2018-07-13 | 潍坊友容实业有限公司 | A kind of process for extracting plant salt and cellulose from Suaeda salsa |
| CN108277672B (en) * | 2017-12-28 | 2020-07-07 | 潍坊友容实业有限公司 | Process method for extracting plant salt and cellulose from suaeda salsa |
| CN108221432B (en) * | 2017-12-28 | 2020-07-07 | 潍坊友容实业有限公司 | Process method for extracting cellulose from suaeda salsa |
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