CN103266517A - Technology for pulping broussonetia papyrifera white barks by using phosphoric acid pretreatment and magnesiumsulfite process - Google Patents
Technology for pulping broussonetia papyrifera white barks by using phosphoric acid pretreatment and magnesiumsulfite process Download PDFInfo
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- CN103266517A CN103266517A CN2013101866971A CN201310186697A CN103266517A CN 103266517 A CN103266517 A CN 103266517A CN 2013101866971 A CN2013101866971 A CN 2013101866971A CN 201310186697 A CN201310186697 A CN 201310186697A CN 103266517 A CN103266517 A CN 103266517A
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- phosphoric acid
- broussonetia
- acid
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- 238000000034 method Methods 0.000 title claims abstract description 54
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 50
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 title claims abstract description 28
- 238000004537 pulping Methods 0.000 title claims abstract description 28
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 25
- 241000705930 Broussonetia papyrifera Species 0.000 title abstract 4
- 235000001459 whitebark Nutrition 0.000 title abstract 4
- 239000002994 raw material Substances 0.000 claims abstract description 66
- 239000002253 acid Substances 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 239000012153 distilled water Substances 0.000 claims description 36
- 241000933832 Broussonetia Species 0.000 claims description 31
- 239000007788 liquid Substances 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 16
- 229920001131 Pulp (paper) Polymers 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 13
- 238000010411 cooking Methods 0.000 claims description 9
- LPHFLPKXBKBHRW-UHFFFAOYSA-L magnesium;hydrogen sulfite Chemical compound [Mg+2].OS([O-])=O.OS([O-])=O LPHFLPKXBKBHRW-UHFFFAOYSA-L 0.000 claims description 9
- 241001460678 Napo <wasp> Species 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 22
- 239000000395 magnesium oxide Substances 0.000 description 11
- 239000001814 pectin Substances 0.000 description 9
- 235000010987 pectin Nutrition 0.000 description 9
- 229920001277 pectin Polymers 0.000 description 9
- 239000003153 chemical reaction reagent Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a technology for pulping broussonetia papyrifera white barks by using phosphoric acid pretreatment and a magnesiumsulfite process. According to the technology, with broussonetia papyrifera white bark bast fiber as a raw material, the raw material is pretreated with (NaPO3)6 and phosphoric acid and then is processed through the magnesiumsulfite process. The broussonetia papyrifera white bark long fibered pulp prepared by using the technology has the characteristics of high whiteness and good strength, the pulping technology is mild in condition and the temperature of the overall process is lower than 100 DEG C.
Description
Technical field
The invention belongs to the chemical pulping technical field of bast class raw material, particularly after the preliminary treatment of a kind of broussonetia white bast phosphoric acid, the magnesium sulfite process pulping technique under temperate condition.
Background technology
Light leaf paper mulberry be Japan in recent years from wild paper mulberry seed selection mutation belong to the Moraceae paper mulberry and belong to, a kind of papermaking new raw material of seed selection in recent years, system's speed is given birth to the broad-leaved assortment, the easy to raise growth, a peeling to be cut every year and its continuous growth could be promoted, its skin belongs to renewable resource, can cut down once every the 2-3 annual ring, can utilize land resource preferably and can not destroy ecological environment.The full skin of light leaf paper mulberry accounts for 12% of full bar, and white skin accounts for 72% of full skin.White skin content of lignin is low, and fiber is elongated, pure white, can make the high-quality chemical pulp that quality is good, economic worth is high, is the raw material of papermaking fiber of high-quality.
If use existing the most frequently used pulping process, namely common soda pulping process and sulfite pulping mostly carry out under high temperature (〉=150 ℃) high pressure, need specific high temperature resistant pressure vessel, can't carry out pulping process under normal pressure.Though the broussonetia white bast lignin content is very low, the content of its pectin is very high, has reached nearly 9%, therefore removes the process of pectin, the part of pulping process just, thus can use the pulping process condition that more relaxes to reach the purpose of pulping.
Summary of the invention
The object of the invention is to provide a kind of phosphoric acid preliminary treatment magnesium sulfite process pulping technique of broussonetia white bast, it is gentle that this method has overall pulping process condition, the slurrying maximum temperature is not higher than 100 ℃, and the bast fiber that makes slurry to have a former pulp brightness higher, intensity is characteristics preferably.
In the pulping process of the present invention, be that bast fiber raw material broussonetia white bast is raw material, adopt (NaPO
3)
6, H
3PO
4, (ortho acid, main component are Mg (HSO to the magnesium bisulfite cooking liquor that provides of MgO medicament and slurrying factory
3)
2, MgSO
3And a certain amount of MgO), carry out slurrying.
The phosphoric acid preliminary treatment magnesium sulfite process pulping technique of broussonetia white bast of the present invention carries out according to following concrete steps, and wherein solid-liquid ratio is solid over dry raw material quality to the ratio of total liquor capacity:
(1) broussonetia white bast is cut into 3cm-5cm, the skin section of width 15mm-25mm is as the chemical pulping raw material;
(2) step (1) raw materials treated is carried out rinsing and boiled: adding distilled water in raw material, to make solid-liquid ratio (solid over dry raw material quality is to the ratio of total liquor capacity) be 1:6-1:10, at room temperature soaks and boil the 6min-10min enzyme that goes out behind the 60min;
(3) raw material after step (2) is handled drains with distilled water washing 6 times;
(4) step (3) washing back raw material is carried out the phosphoric acid preliminary treatment: (the NaPO that adds raw material over dry quality 0.4%-0.6%
3)
6And adding distilled water, to make solid-liquid ratio (solid over dry raw material quality is to the ratio of total liquor capacity) be 1:10-1:20, at room temperature soak 30min, use the phosphorus acid for adjusting pH value to 1.5-2.0 then, back insulation 90min-120mim under 85 ℃-95 ℃ stirs, make in the broussonetia white bast pectin in diluted acid, change into water soluble pectin and be dissolved out, can make follow-up pectin and extract and use;
(5) raw material handled of step (4) is washed with distilled water to pH=6.5-7.5;
(6) step (5) is washed the magnesium sulfite process processing that the back raw material carries out temperate condition;
The slurry of the gained after (7) step (6) is handled is washed with distilled water to pH=6.5-7.5;
(8) step (7) is washed disposed slurry and place pulp screen, use sieve seam to add clear water as the sieve plate of 0.40mm and screen, separate screening reject, namely obtain clean paper pulp.
According to the low permanganate number of final paper pulp and high viscosity requirement, the magnesium sulfite process treatment conditions of step (6) can be regulated, above-mentioned steps (6) is located to calculate required cooked solution volume according to solid-liquid ratio (ratio of solid over dry raw material quality and total liquor capacity) for 1:4-1:6, cooked solution total acid T.A. is that 1.0%-1.2%(is with respect to the quality-percentage by volume of total liquor capacity as requested) the magnesium bisulfite cooking liquor of newly joining that calculates required slurrying factory and provide (is ortho acid, slurrying factory provides, general total acid T.A. is higher, and acid is less than or equal to 1 than F.A.; The T.A. of ortho acid and C.A. can pass through total SO
2, free SO
2Mensuration calculate), cooked solution combined acid C.A. is that 0.7%-0.9%(is with respect to the quality-percentage by volume of total liquor capacity as requested again) calculate and determine the MgO addition, add distilled water at last and mix the pretreated raw material of back adding, feed liquid evenly stirs the back and is incubated 90min-120min down at 85 ℃-95 ℃.
Among the present invention magnesium bisulfite the processing stage the required former acid solution of magnesium bisulfite newly joined by slurrying factory and provide, different slurrying factory provide all can, mainly adopt it to provide the MgO emulsion for oneself and absorb self-produced SO
2Obtain, its main component is all Mg (HSO
3)
2, MgSO
3And a certain amount of MgO, general total acid T.A. is higher, and acid is less than or equal to 1 than F.A.; The T.A. of ortho acid and C.A. can pass through total SO
2, free SO
2Mensuration calculate; Other reagent do not have specified otherwise, are commercially available conventional reagent, and reagent such as the calgon that uses, phosphoric acid, magnesia are AR.
The present invention is with respect to the advantage of prior art:
(1) the light leaf paper mulberry of Shi Yonging is a kind of papermaking new raw material of seed selection in recent years, easily plantation, and growth is fast, will cut a peeling every year and could promote its continuous growth, and its skin belongs to renewable resource, can utilize land resource preferably and can not destroy ecological environment;
(2) broussonetia white bast content of lignin low (＜9%), fiber is pure white, and fibre length long (about average length 6.7mm), and length-width ratio big (about 332) is the raw material of papermaking fiber of high-quality;
(3) rinsing and phosphoric acid preliminary treatment, make at first that pectolysis comes out in the broussonetia white bast, acid treatment can change into the water-insoluble pectin in the plant cell water soluble pectin and be dissolved out in diluted acid, the pectin solution that is dissolved out can be expected further to carry out pectin and be extracted.Though raw material complete pulping after the acid treatment only relies on the subsequent treatment of condition milder, namely the magnesium sulfite process of temperate condition is handled, and can obtain satisfactory paper pulp.And the composition of magnesium sulfite process pulping and digesting soup mainly is Mg (HSO
3)
2, MgSO
3The pH value of cooking liquor is generally 3-6, and the effect that adds MgO is to regulate combined acid.Conventional magnesium sulfite process makes magma, and just to have whiteness higher, and bleachability is characteristics preferably.The use of magnesium base makes it have the cheap of calcium salt base equally in the sulphite, and has improved the sodium base cooking waste liquor and reclaimed difficult problem.And the magnesium sulfite process that re-uses after the preliminary treatment of broussonetia white bast phosphoric acid is handled, and can use the process conditions that more relax, and reduces drug dosage, and maximum temperature is reduced to below 100 ℃, and slurrying whole process can be carried out under normal pressure.
In a word, novel material broussonetia white bast fiber quality is good, content of lignin is low, cooperate suitable phosphoric acid preliminary treatment magnesium sulfite process slurrying again, have the potentiality of preparation high-quality bast long fiber slurry, adopt the inventive method to make broussonetia white bast slurrying temperature not be higher than 100 ℃, and the former pulp brightness that makes is higher, intensity is better, and former pulp brightness can reach 50%ISO-60%ISO, and viscosity can reach 1300-1400mL/g.
The specific embodiment
Be further described explanation below by the present invention of embodiment, but protection domain of the present invention is not limited to described content, method is conventional method if no special instructions in the present embodiment, the reagent that uses reagent to be conventional commercial reagent if no special instructions or to prepare according to a conventional method; Solid-liquid ratio is solid over dry raw material quality to the ratio of total liquor capacity among the embodiment, and total acid T.A. and combined acid C.A. are the quality-percentage by volume with respect to total liquor capacity, and the T.A. of ortho acid and C.A. can pass through total SO
2, free SO
2Mensuration calculate.
Embodiment 1: the phosphoric acid preliminary treatment magnesium sulfite process pulping technique of this broussonetia white bast, and particular content is as follows:
(1) is raw material with the broussonetia white bast, is cut into length 3cm-5cm with chopper, the skin section of width 15mm-25mm;
(2) the skin section is positioned in the distilled water, making solid-liquid ratio is 1:6, boils 6min after at room temperature soaking 60min;
(3) raw material of handling with distilled water washing step (2) washs 6 times, drains;
(4) step (3) washing back raw material is carried out the phosphoric acid preliminary treatment, add (the NaPO of raw material over dry quality 0.4% in the raw material after draining
3)
6, and adding distilled water, to make solid-liquid ratio be 1:10, at room temperature soaks 30min after stirring earlier, and then use phosphorus acid for adjusting pH value to 1.5, the back that stirs is at 85 ℃ of insulation 100mim down;
(5) raw material of handling with distilled water washing step (4) washs to pH=6.5;
(6) step (5) is washed the back raw material and carry out the magnesium sulfite process processing, be that the proportional meter of 1:4 is calculated required liquor capacity according to solid-liquid ratio, cooked solution total acid T.A. is that 1.2% consumption that calculates required magnesium bisulfite cooking liquor (is ortho acid as requested, slurrying factory provides, newly join, general total acid T.A. is higher, acid is less than or equal to 1 than F.A.), be 0.7% by calculate determining the MgO addition according to combined acid C.A. again, add distilled water at last and mix the pretreated raw material of back adding, be incubated 90min down at 95 ℃ after feed liquid stirs;
(7) with the slurry of the gained after distilled water washing step (6) processing, wash to pH=7.5;
(8) step (7) is washed disposed slurry and place pulp screen, use sieve seam to add clear water as the sieve plate of 0.40mm and screen, separate screening reject, namely obtain clean paper pulp.
Result: paper pulp screened yield 54.2%, permanganate number 8.60, viscosity 1350mL/g, whiteness 54.3%ISO.
Embodiment 2: the magnesium sulfite process pulping technique of temperate condition after the phosphoric acid preliminary treatment of this broussonetia white bast, and particular content is as follows:
(1) is raw material with the broussonetia white bast, is cut into length 3cm-5cm with chopper, the skin section of width 15mm-25mm;
(2) the skin section is positioned in the distilled water, making solid-liquid ratio is 1:8, boils 8min after at room temperature soaking 60min;
(3) raw material of handling with distilled water washing step (2) washs 6 times, drains;
(4) step (3) washing back raw material is carried out the phosphoric acid preliminary treatment, add (the NaPO of raw material over dry quality 0.5% in the raw material after draining
3)
6, and add distilled water and make solid-liquid ratio 1:15, at room temperature to soak 30min after stirring earlier, and then use phosphorus acid for adjusting pH value to 2.0, the back that stirs is at 90 ℃ of insulation 100mim down;
(5) raw material of handling with distilled water washing step (4) washs to pH=7.0;
(6) step (5) is washed the back raw material and carry out the magnesium sulfite process processing, be that the proportional meter of 1:5 is calculated required liquor capacity according to solid-liquid ratio, cooked solution total acid T.A. is that the required magnesium bisulfite cooking liquor of 1.2% calculating (is ortho acid as requested, slurrying factory provides, newly join, general total acid T.A. is higher, acid is less than or equal to 1 than F.A.), be 0.8% by calculate determining the MgO addition according to combined acid C.A. again, add distilled water at last and mix the pretreated raw material of back adding, be incubated 120min down at 85 ℃ after feed liquid stirs;
(7) with the slurry of the gained after distilled water washing step (6) processing, wash to pH=7.0;
(8) step (7) is washed disposed slurry and place pulp screen, use sieve seam to add clear water as the sieve plate of 0.40mm and screen, separate screening reject, namely obtain clean paper pulp.
Result: paper pulp screened yield 52.0%, permanganate number 7.65, viscosity 1320mL/g, whiteness 54.0%ISO.
Embodiment 3: the magnesium sulfite process pulping technique of temperate condition after the phosphoric acid preliminary treatment of this broussonetia white bast, and particular content is as follows:
(1) is raw material with the broussonetia white bast, is cut into length 3cm-5cm with chopper, the skin section of width 15mm-25mm;
(2) the skin section is positioned in the distilled water, making solid-liquid ratio is 1:10, boils 10min after at room temperature soaking 60min;
(3) raw material of handling with distilled water washing step (2) washs 6 times, drains;
(4) step (3) washing back raw material is carried out the phosphoric acid preliminary treatment, add (the NaPO of raw material over dry quality 0.6% in the raw material after draining
3)
6, and add distilled water and make solid-liquid ratio 1:20, at room temperature to soak 30min after stirring earlier, and then use phosphorus acid for adjusting pH value to 2.0, the back that stirs is at 95 ℃ of insulation 90mim down;
(5) raw material of handling with distilled water washing step (4) washs to pH=7.5;
(6) step (5) is washed the back raw material and carry out the magnesium sulfite process processing, be that the proportional meter of 1:6 is calculated required liquor capacity according to solid-liquid ratio, cooked solution total acid T.A. is that the required magnesium bisulfite cooking liquor of 1.0% calculating (is ortho acid as requested, slurrying factory provides, newly join, general total acid T.A. is higher, acid is less than or equal to 1 than F.A.), be 0.7% by calculate determining the MgO addition according to combined acid C.A. again, add distilled water at last and mix the pretreated raw material of back adding, be incubated 100min down at 90 ℃ after feed liquid stirs;
(7) with the slurry of the gained after distilled water washing step (6) processing, wash to pH=7;
(8) step (7) is washed disposed slurry and place pulp screen, use sieve seam to add clear water as the sieve plate of 0.40mm and screen, separate screening reject, namely obtain clean paper pulp.
Result: paper pulp screened yield 52.3%, permanganate number 7.84, viscosity 1390mL/g, whiteness 58.2%ISO.
Embodiment 4: the magnesium sulfite process pulping technique of temperate condition after the phosphoric acid preliminary treatment of this broussonetia white bast, and particular content is as follows:
(1) is raw material with the broussonetia white bast, is cut into length 3cm-5cm with chopper, the skin section of width 15mm-25mm;
(2) the skin section is positioned in the distilled water, makes solid-liquid ratio 1:8, boil 9min after at room temperature soaking 60min;
(3) raw material of handling with distilled water washing step (2) washs 6 times, drains;
(4) step (3) washing back raw material is carried out the phosphoric acid preliminary treatment, add (the NaPO of raw material over dry quality 0.5% in the raw material after draining
3)
6, and add distilled water and make solid-liquid ratio 1:12, at room temperature to soak 30min after stirring earlier, and then use phosphorus acid for adjusting pH value to 1.8, the back that stirs is at 85 ℃ of insulation 120mim down;
(5) raw material of handling with distilled water washing step (4) washs to pH=7.5;
(6) step (5) is washed the back raw material and carry out the magnesium sulfite process processing, be that the proportional meter of 1:5 is calculated required liquor capacity according to solid-liquid ratio, cooked solution total acid T.A. is that the required magnesium bisulfite cooking liquor of 1.1% calculating (is ortho acid as requested, slurrying factory provides, newly join, general total acid T.A. is higher, acid is less than or equal to 1 than F.A.), be 0.9% by calculate determining the MgO addition according to combined acid C.A. again, add distilled water at last and mix the pretreated raw material of back adding, be incubated 110min down at 90 ℃ after feed liquid stirs;
(7) with the slurry of the gained after distilled water washing step (6) processing, wash to pH=6.5;
(8) step (7) is washed disposed slurry and place pulp screen, use sieve seam to add clear water as the sieve plate of 0.40mm and screen, separate screening reject, namely obtain clean paper pulp.
Result: paper pulp screened yield 52.6%, permanganate number 7.30, viscosity 1370mL/g, whiteness 53.8%ISO.
Claims (3)
1. broussonetia white bast phosphoric acid preliminary treatment magnesium sulfite process pulping process, carry out slurrying with the broussonetia white bast raw material, it is characterized in that: raw material at first carries out rinsing and boils, then it is carried out the phosphoric acid preliminary treatment, adopt the magnesium sulfite process of temperate condition that it is handled at last and make paper pulp.
2. according to the described broussonetia white bast phosphoric acid of claim 1 preliminary treatment magnesium sulfite process pulping process, it is characterized in that concrete pulping process step is as follows:
(1) broussonetia white bast is cut into long 3cm-5cm, the skin section of width 15mm-25mm is as the chemical pulping raw material;
(2) rinsing is boiled: raw material is positioned in the distilled water, and making solid-liquid ratio is 1:6-1:10, boils 6min-10min after at room temperature soaking 60min;
(3) raw materials treated filtration washing with distilled water washing 6 times, drains;
(4) phosphoric acid the preliminary treatment: (NaPO that adds raw material over dry quality 0.4%-0.6% in the raw material after draining
3)
6, and adding distilled water, to make solid-liquid ratio be 1:10-1:20, uses the phosphorus acid for adjusting pH value to 1.5-2.0 after at room temperature soaking 30min, the back that stirs is at 85 ℃-95 ℃ insulation 90min-120mim down;
(4) to be washed with distilled water to pH be 6.5-7.5 to pretreated raw material;
(5) pretreated raw material carries out the magnesium sulfite process processing of temperate condition, and it is 6.5-7.5 that the back paper pulp of finishing dealing with is washed with distilled water to pH;
(6) gained slurry in washing back places pulp screen, uses the sieve seam to add clear water as the sieve plate of 0.40mm and screens, and the separation screening reject namely obtains clean paper pulp.
3. according to the technology of the described broussonetia white bast phosphoric acid of claim 2 preliminary treatment magnesium sulfite process slurrying, it is characterized in that: the process conditions that the magnesium sulfite process of step (5) temperate condition is handled are: be that 1:4-1:6 calculates required cooked solution volume according to solid-liquid ratio, the cooked solution total acid T.A. consumption of newly joining the magnesium bisulfite cooking liquor that required slurrying factory provides for 1.0%-1.2% calculates as requested, cooked solution combined acid C.A. is that 0.7%-0.9% calculates definite MgO addition as requested again, add distilled water at last and mix the pretreated raw material of back adding, feed liquid evenly stirs the back and is incubated 90min-120min down at 85 ℃-95 ℃.
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|---|---|---|---|---|
| CN1124791A (en) * | 1994-04-14 | 1996-06-19 | 武汉大学 | Fast degumming aid for ramie and Broussonetia papyrifera bark and technique |
| CN101158127A (en) * | 2007-11-01 | 2008-04-09 | 大连工业大学 | Broussonetia white bast biological pulping method |
| JP2012512138A (en) * | 2008-11-28 | 2012-05-31 | 株式會社アモーレパシフィック | Facial pack manufactured using Korean paper cotton for makeup |
-
2013
- 2013-05-20 CN CN201310186697.1A patent/CN103266517B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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