CN102154873A - Method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor - Google Patents
Method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor Download PDFInfo
- Publication number
- CN102154873A CN102154873A CN 201110089180 CN201110089180A CN102154873A CN 102154873 A CN102154873 A CN 102154873A CN 201110089180 CN201110089180 CN 201110089180 CN 201110089180 A CN201110089180 A CN 201110089180A CN 102154873 A CN102154873 A CN 102154873A
- Authority
- CN
- China
- Prior art keywords
- boiling
- black liquor
- cooking
- section
- liquor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Paper (AREA)
Abstract
The invention discloses a method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor. According to the characteristic of quick delignifying of the grass raw materials by adopting alkaline cooking, low temperature and normal pressure are adopted in a first stage, and black liquor is added for cooking at the two stages. A cooking result indicates that the Kappa number of paper pulp, the yield of screened pulp, the residual alkali in the black liquor and the like are uniform and stable, and stable operation can be realized. Compared with the conventional soda anthraquinone cooking method, the two-stage cooking method disclosed by the invention has the advantages: operation can be performed under low temperature condition, and the alkali amount is reduced, the yield of screened pulp is increased and the residue sieving rate is low under the condition that the Kappa number is basically the same. Moreover, O-DQ-P and O-Q-P-P bleaching are performed on pulp obtained by using the two-stage cooking method and the conventional soda anthraquinone cooking method, and the physical property of the pulp is detected. A result indicates that the whiteness and the viscosity of bleach pulp obtained by the two-stage cooking are higher than those of bleach pulp obtained by the conventional cooking, and the bleach pulp has better bleachability and higher mechanical intensity, and can be used for making writing paper, offset printing book paper and the like.
Description
Technical field
The invention belongs to the pulp and paper technology field, particularly relate to a kind of two sections boiling methods of grass as raw material caustic soda anthraquinone that add black liquor.
Background technology
World today's paper industry all be with timber as main raw material, but since China be the country of a forest reserves relative shortage, so wood pulp for paper is seriously under-supply for a long time, a large amount of commercial wood pulp of import of having to every year.In order to develop the paper industry of China better, must face the particularity of China's papermaking material structure, strive making good use of straw pulp, rationally make good use of the straw resource that China's quantity is huge, price is comparatively cheap by every possible means, this development to China's paper industry has very important effect.Wheat straw, bagasse and reed reed all are resourceful non-wood papermaking raw materials, also are the very big paper making raw materials of China's consumption simultaneously.Grass as raw material slurrying not only can be alleviated the paper making raw material contradiction of shortage day by day, but also can protect human ecological environment.At present, actual production medium-height grass class raw pulp mainly adopts traditional soda-aq cooking to carry out boiling.This method is that boiling is just all added when boiling begins with alkali, because the alkali of early stage of cooking is dense higher, therefore easily causes the degraded of hemicellulose, so become pulp yield lower; Along with the carrying out of boiling, because the continuous consumption of alkali, the alkali of final stage of cooking is dense lower, therefore is unfavorable for removing of lignin, and the hardness of pulping is higher as a result.The then most digesting technoloys with reference to timber of two sections boiling methods of grass as raw material caustic soda anthraquinone of existing interpolation black liquor carry out boiling in the scientific research, promptly under the temperature more than 120 ℃, carry out first section boiling or black liquor preliminary treatment, because the pretreated temperature of black liquor is higher, all more than 100 ℃, so the boiling energy consumption is higher.In addition, well-known, because the delignification speed of grass as raw material is very fast, the bulk delignification stage is to be warming up to below 100 ℃, so carry out the black liquor preliminary treatment or first section boiling is not too reasonable with the temperature that surpasses 100 ℃.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide and a kind ofly can reduce alkali charge, and two sections boiling methods of grass as raw material caustic soda anthraquinone of the good interpolation black liquor of pulp quality.
In order to achieve the above object, two sections boiling methods of grass as raw material caustic soda anthraquinone of interpolation black liquor provided by the invention comprise the following step that carries out in order:
1) grass as raw material is cut into the long blade of 30-50mm, uses for boiling after the screening dedusting; Or with through the bagasse that removes marrow directly as the boiling raw material; Or with the blade of wet feed preparation as the boiling raw material;
2) will be made into I section cooking liquor after white liquid and the black liquor mixing;
3) I section boiling: above-mentioned raw materials and I section cooking liquor are packed in the boiling vessel, perhaps blade is mixed earlier with I section cooking liquor and afterwards reinstall in the boiling vessel, be warming up to 60～90 ℃ afterwards, alkali charge is 8%～10% (NaOH meter), liquor ratio 1: 7～1: 8, anthraquinone consumption are 0.02%～0.05%, and the heating-up time is 1～20min, be incubated 10～30min then, to make the half stuff material;
4) II section boiling: the black liquor in the above-mentioned half stuff material is extruded, directly add the II section cooking liquor that is mixed with by white liquid and black liquor without washing, be warming up to 140 ℃～150 ℃ then, alkali charge is 5%～7% (NaOH meter), liquor ratio 1: 5, anthraquinone consumption are 0.02%～0.05%, and the heating-up time is 40～60min, be incubated 50min～70min then, last blowing promptly can be made into the caustic soda anthraquinone straw pulp of described interpolation black liquor.
The mixed liquor of I section and II section black liquor when used black liquor is preceding once boiling described step 2), residual alkali is 5～8g/L.
The black liquor of II section when used black liquor is preceding once boiling in the described step 4), residual alkali is 6～9g/L.
Two sections boiling methods of grass as raw material caustic soda anthraquinone of interpolation black liquor provided by the invention are according to the fast characteristics of grass as raw material alkaline cooking delignification, and first section is adopted low-temperature atmosphere-pressure, and two sections are all added the black liquor boiling.Boiling is the result show, paper pulp kappa number, screened yield, residual alkali etc. are uniform and stable, can stably move.By comparing with traditional caustic soda anthraquinone boiling method, find that these two sections boiling methods can carry out under cryogenic conditions, and under the essentially identical prerequisite of Kappa number, alkali charge reduces, screened yield increases, and the screening reject rate is less.In addition, these two sections boiling methods and traditional caustic soda anthraquinone boiling method gained slurry O-DQ-P, O-Q-P-P bleaching and the detection of bleached pulp physical property have been carried out respectively, the result shows, whiteness, the viscosity of these two sections boiling and bleaching slurries all is higher than traditional boiling and bleaching slurry, has bleachability preferably, and have mechanical strength preferably, can join and copy writing paper, offset paper etc.
The specific embodiment
Be elaborated below in conjunction with specific embodiment two sections boiling methods of grass as raw material caustic soda anthraquinone to interpolation black liquor provided by the invention.
Embodiment 1:
Two sections boiling methods of the wheat straw soda anthraquinone of the interpolation black liquor that present embodiment provides comprise the following step that carries out in order:
1) wheat straw is cut into the long blade of 30-50mm, uses for boiling after the screening dedusting;
2) be to be made into I section cooking liquor after the black liquor of 5.6g/L mixes with white liquid and residual alkali;
3) I section boiling: with in above-mentioned blade and the boiling vessel of packing into after I section cooking liquor mixes, (between when) is warming up to 75 ℃ afterwards, and alkali charge is 9% (NaOH meter), liquor ratio 1: 7, and the anthraquinone consumption is 0.03%, is incubated 10min then, to make wheat straw half stuff material;
3) II section boiling: the black liquor in the above-mentioned wheat straw half stuff material is extruded, directly adding by white liquid and residual alkali without washing is the II section cooking liquor of the black liquor preparation of 6.3g/L, in the time of 60min, be warming up to 145 ℃ then, alkali charge is 5% (NaOH meter), liquor ratio 1: 5, the anthraquinone consumption is 0.02%, is incubated 50min then, and last blowing promptly can be made into the caustic soda anthraquinone Straw Pulp of described interpolation black liquor.
Embodiment 2:
Two sections boiling methods of bagasse caustic soda anthraquinone of the interpolation black liquor that present embodiment provides comprise the following step that carries out in order:
1) stores and removes the bagasse of marrow with dry method directly as the boiling raw material;
2) be to be made into I section cooking liquor after the black liquor of 5.6g/L mixes with white liquid and residual alkali;
3) I section boiling: with in above-mentioned bagasse and the boiling vessel of packing into after I section cooking liquor mixes, be warming up to 70 ℃ afterwards in the time of 10min, alkali charge is 9.5% (NaOH meter), liquor ratio 1: 7, the anthraquinone consumption is 0.04%, is incubated 20min then, to make bagasse half stuff material;
3) II section boiling: the black liquor in the above-mentioned bagasse half stuff material is extruded, directly adding by white liquid and residual alkali without washing is the II section cooking liquor of the black liquor preparation of 7g/L, in the time of 50min, be warming up to 150 ℃ then, alkali charge is 5.5% (NaOH meter), liquor ratio 1: 5, the anthraquinone consumption is 0.03%, is incubated 45min then, and last blowing promptly can be made into the caustic soda anthraquinone bagasse pulp of described interpolation black liquor.
Embodiment 3:
Two sections boiling methods of reed caustic soda anthraquinone of the interpolation black liquor that present embodiment provides comprise the following step that carries out in order:
1) reed is cut into the long reed sheet of 30-50mm, sieves, use for boiling to remove dust and chip;
2) be to be made into I section cooking liquor after the black liquor of 8g/L mixes with white liquid and residual alkali;
3) I section boiling: above-mentioned reed sheet and I section cooking liquor are joined in the boiling vessel simultaneously, be warming up to 80 ℃ afterwards in the time of 20min, alkali charge is 10%, liquor ratio 1: 7, and the anthraquinone consumption is 0.05%, is incubated 10min then, to make reed half stuff material;
4) II section boiling: the black liquor in above-mentioned reed half stuff material is extruded, directly adding by white liquid and residual alkali without washing is the II section cooking liquor of the black liquor preparation of 8.2g/L, in the time of 40min, be warming up to 145 ℃ then, alkali charge is 6%, liquor ratio 1: 5, the anthraquinone consumption is 0.03%, is incubated 60min then, and last blowing promptly can be made into caustic soda anthraquinone reed slurry of described interpolation black liquor.
One, boiling
Effect for two sections boiling methods of grass as raw material caustic soda anthraquinone of verifying interpolation black liquor provided by the invention, the present patent application people is to having carried out quality testing by the Straw Pulp of preparing in the foregoing description 1, and with the Straw Pulp quality prepared according to traditional caustic soda anthraquinone boiling method as a comparison, boiling the results are shown in Table 1:
Table 1 two sections boiling methods and traditional caustic soda anthraquinone boiling method
Annotate: traditional conditions of cooking: liquor ratio 1: 5, anthraquinone be with heavy by 0.05%, heating-up time 90min, 160 ℃ of maximum temperatures, temperature retention time 5min.
The data on B-1, B-2, B-3 hurdle as can be seen from table 1, when wheat straw being carried out boiling according to these two sections boiling methods, the Kappa number fluctuation range of Straw Pulp little (18.0～18.5), screened yield is about 50%, the screening reject rate is stable (1.5%～1.6%), and two sections residual alkali fluctuations are less, as seen, two sections digesting technoloys provided by the invention can stable operation, and effect is better.
The data on B-1, B-2, B-3 and A-64, A-65, A-66 hurdle as can be seen from table 1, (the former Kappa number was 18.0～18.5 when the prepared Straw Pulp Kappa number that goes out of these two sections boiling methods and traditional caustic soda anthraquinone boiling method was close, the latter's Kappa number is 18.4), total alkali charge of two sections is that 13% (the I section is 8% in these two sections boiling methods, the II section is 5%), the alkali charge of traditional caustic soda anthraquinone boiling method then is 14%, therefore can save 1% chemicals consumption, this can reduce production costs to a certain extent; The screened yield of these two sections boiling methods is 49.9%～50.1% (shown in B-1, B-2, B-3 in the table 1), and the screened yield of traditional caustic soda anthraquinone boiling method is 48.8% (shown in A-65 in the table 1), and screened yield has improved about 1.1%～1.3%;
In addition, the Straw Pulp screening reject rate that these two sections boiling methods are prepared is also than traditional caustic soda anthraquinone boiling method decrease (the former screening reject rate is 1.5%～1.6%, and the latter's screening reject rate is 1.9%).
As seen, the effect of two sections boiling methods of wheat straw soda anthraquinone of the interpolation black liquor that provides of the present patent application is better than traditional wheat straw soda anthraquinone boiling method.Simultaneously, also the selectivity that black liquor can improve delignification is added in explanation, accelerates delignification reaction speed.
Two, bleaching
The present patent application people bleaches according to identical conditions of bleaching with the Straw Pulp that two kinds of bleaching methods of O-DQ-P, O-Q-P-P are prepared these two sections boiling methods and traditional caustic soda anthraquinone boiling method respectively.
Be bleaching magma with traditional wheat straw soda anthraquinone boiling method (liquor ratio 1: 5, anthraquinone consumption 0.05%, heating-up time 90min, 160 ℃ of maximum temperatures, temperature retention time 5min) gained slurry, the technology of its oxygen delignification section (O) is: the NaOH consumption is 2.5%, MgSO
4Consumption is 0.5%, starch dense 10%, temperature i00 ℃, temperature retention time 60min, oxygen is pressed 0.6MPa.The oxygen delignification result is: endpoint pH is 11.2, and Kappa number is 11.8, and viscosity is 1056mg/L.
With these two sections boiling methods (I section, liquor ratio 1: 7, anthraquinone consumption 0.03%, temperature retention time 10min, 75 ℃ of maximum temperatures, alkali charge 8%; The II section, liquor ratio 1: 5, anthraquinone consumption 0.02%, 145 ℃ of maximum temperatures, temperature retention time 45min) the gained slurry is for bleaching magma, and the bleaching process of its oxygen delignification section (O) is: the NaOH consumption is 2.5%, MgSO
4Consumption is 0.5-%, starch dense 10%, 100 ℃ of temperature, temperature retention time 60min, oxygen is pressed 0.6MPa.The oxygen delignification result is: endpoint pH is 11.6, and Kappa number is 10.5, and viscosity is 1040mg/L.
(1) DQ-P bleaching
Respectively above two kinds of oxygen delignification section bleached pulps are bleached according to following process conditions: the slurry of DQ bleaching section is dense to be 10%; DQ section: ClO
2Consumption 1.0%, 75 ℃ of temperature, time 45min, DTPA consumption 0.35%; P section: 90 ℃ of temperature, time 120min, NaOH consumption 1.2%, MgSO
4Consumption 0.05%, DTPA consumption 0.3%, H
2O
2Consumption 2.0%.In thermostat water bath, carry out the DQ-P bleaching with plastic bag.The bleaching results of two kinds of slurries is as shown in table 2.
The bleaching results of table 2 DQ section and P section
As can be seen from Table 2, when respectively two kinds of slurries being bleached according to above-mentioned process conditions, Straw Pulp that these two sections boiling methods are prepared is through O-DQ bleaching back (in the table 21
#), Kappa number is lower than traditional Straw Pulp (in the table 22
#), viscosity then is higher than traditional Straw Pulp (exceeding about 25mg/L); After the bleaching of P section, Straw Pulp whiteness, the viscosity that these two sections boiling methods are prepared all is higher than traditional Straw Pulp (whiteness exceeds about 1.6%, and viscosity exceeds about 15mg/L).As seen, under the conditions of bleaching of identical O-DQ-P, compare with traditional Straw Pulp, the Straw Pulp that these two sections boiling methods are prepared has bleachability preferably.
(2) Q-P-P bleaching
The present patent application people carries out oxygen delignification (O) respectively in the Straw Pulp that these two sections boiling methods and traditional caustic soda anthraquinone boiling method are prepared and proceeds chelation treatment afterwards, treatment conditions are: the DTPA consumption is 0.3%, temperature is 70 ℃, temperature retention time is 45min, starching dense is 4%, the Straw Pulp original ph that these two sections boiling methods are prepared is 3.3, and endpoint pH is 4.8; The Straw Pulp original ph that tradition caustic soda anthraquinone boiling method is prepared is 3.4, and endpoint pH is 4.6.
To bleach by following process conditions in thermostat water bath through the slurry after the chelation treatment: the slurry of two sections P bleachings is dense to be 10%, and temperature all is 90 ℃; P
1Section: NaOH consumption 1.1%, MgSO
4Consumption 0.05%, H
2O
2Consumption 2.5%, time 120min; P
2Section: NaOH consumption 1.0%, MgSO
4Consumption 0.05%, H
2O
2Consumption 2%, time 120min.Carry out the P-P bleaching experiment with plastic bag respectively, two sections P section bleaching results are as shown in table 3:
Table 3 P-P section bleaching results
As can be seen from Table 3, when respectively two kinds of slurries being bleached according to above-mentioned bleaching conditions, these two sections boiling Straw Pulp are through O-Q-P
1Bleaching back is (in the table 33
#), Kappa number is lower than traditional caustic soda anthraquinone Straw Pulp (in the table 34
#), numerical value differs about 2, and viscosity is then suitable with traditional caustic soda anthraquinone Straw Pulp; Through P
2After the section bleaching, the whiteness of these two sections boiling Straw Pulp, viscosity all are higher than traditional caustic soda anthraquinone Straw Pulp (whiteness exceeds about 1.5%ISO, and viscosity exceeds about 11mg/L).As seen, under identical O-Q-P-P conditions of bleaching, compare with traditional caustic soda anthraquinone Straw Pulp, these two sections boiling Straw Pulp have bleachability preferably.
Three, the physical property of paper
The present patent application people discongests these two sections boiling Straw Pulp and the traditional caustic soda anthraquinone Straw Pulp bleached pulp after O-DQ-P or O-Q-P-P float preface respectively on the standard fluffer, and copying paper on the sheet former fast, the gained handsheet is surveyed its physical performance index respectively behind the constant temperature and humidity equilibrium water conten, and analyzed relatively, the results are shown in Table 4 and table 5.
Table 4 O-DQ-P bleached pulp physical property
Annotate: during folding test, spring tension is 14.72N.
As can be seen from Table 4, after O-DQ-P bleaching, in these two sections boiling Straw Pulp (in the table 41
#) and traditional caustic soda anthraquinone Straw Pulp (in the table 42
#) physical property detect in the data, the former tightness performance is a little less than the latter; Optical property such as whiteness, opacity be the former higher (wherein, whiteness exceeds about 1.7%ISO); In the strength character, except that burst index for the former a little less than the latter, tensile index, tear index, folding strength etc. are that the former is higher.
On the whole, the physical property of these two sections boiling Straw Pulp is better than traditional caustic soda anthraquinone Straw Pulp, and better performances such as its whiteness, intensity, can join and copy writing paper, offset paper etc.
Table 5 O-Q-P-P bleached pulp physical property
Annotate: during folding test, spring tension is 14.72N.
As can be seen from Table 5, after O-Q-P-P bleaching, in these two sections boiling Straw Pulp (in the table 53
#) and traditional caustic soda anthraquinone Straw Pulp (in the table 54
#) physical property detect in the data, the former tightness and the latter are suitable; Optical property such as whiteness, opacity be the former higher (wherein, whiteness exceeds 1.3%ISO approximately); In the strength character, except that burst index for the former a little less than the latter, tensile index, tear index, folding strength etc. are that the former is higher.On the whole, the physical property of these two sections boiling Straw Pulp is better than traditional caustic soda anthraquinone Straw Pulp, and better performances such as its whiteness, intensity, can join and copy writing paper, offset paper etc.
Claims (3)
1. two sections boiling methods of grass as raw material caustic soda anthraquinone that add black liquor is characterized in that: two sections boiling methods of grass as raw material caustic soda anthraquinone of described interpolation black liquor comprise the following step that carries out in order:
1) grass as raw material is cut into the long blade of 30-50mm, uses for boiling after the screening dedusting; Or with through the bagasse that removes marrow directly as the boiling raw material; Or with the blade of wet feed preparation as the boiling raw material;
2) will be made into I section cooking liquor after white liquid and the black liquor mixing;
3) I section boiling: above-mentioned raw materials and I section cooking liquor are packed in the boiling vessel, perhaps blade is mixed earlier with I section cooking liquor and afterwards reinstall in the boiling vessel, be warming up to 60～90 ℃ afterwards, alkali charge is 8%～10% (NaOH meter), liquor ratio 1: 7～1: 8, anthraquinone consumption are 0.02%～0.05%, and the heating-up time is 1～20min, be incubated 10～30min then, to make the half stuff material;
4) II section boiling: the black liquor in the above-mentioned half stuff material is extruded, directly add the II section cooking liquor that is mixed with by white liquid and black liquor without washing, be warming up to 140 ℃～150 ℃ then, alkali charge is 5%～7% (NaOH meter), liquor ratio 1: 5, anthraquinone consumption are 0.02%～0.05%, and the heating-up time is 40～60min, be incubated 50min～70min then, last blowing promptly can be made into the caustic soda anthraquinone straw pulp of described interpolation black liquor.
2. two sections boiling methods of grass as raw material caustic soda anthraquinone of interpolation black liquor according to claim 1 is characterized in that: the mixed liquor of I section and II section black liquor when used black liquor is preceding once boiling described step 2), residual alkali is 5～8g/L.
3. two sections boiling methods of grass as raw material caustic soda anthraquinone of interpolation black liquor according to claim 1 is characterized in that: the black liquor of II section when used black liquor is preceding once boiling in the described step 4), residual alkali is 6～9g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110089180 CN102154873A (en) | 2011-04-11 | 2011-04-11 | Method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110089180 CN102154873A (en) | 2011-04-11 | 2011-04-11 | Method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102154873A true CN102154873A (en) | 2011-08-17 |
Family
ID=44436531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110089180 Pending CN102154873A (en) | 2011-04-11 | 2011-04-11 | Method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102154873A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330525A (en) * | 2014-09-24 | 2015-02-04 | 朱琳 | Method for rapid evaluation of caustic soda- anthraquinone process pulping process of eucalyptus |
| CN104391078A (en) * | 2014-09-23 | 2015-03-04 | 王朝辉 | Method for rapidly evaluating poplar soda-AQ pulping process |
| CN104407098A (en) * | 2014-09-23 | 2015-03-11 | 王朝辉 | Rapid method for evaluation of birch caustic soda anthraquinone pulping process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590639A (en) * | 2003-08-26 | 2005-03-09 | 山东泉林纸业有限责任公司 | Impregnation pretreatment technology of raw material used in soda process pulp making |
-
2011
- 2011-04-11 CN CN 201110089180 patent/CN102154873A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590639A (en) * | 2003-08-26 | 2005-03-09 | 山东泉林纸业有限责任公司 | Impregnation pretreatment technology of raw material used in soda process pulp making |
Non-Patent Citations (1)
| Title |
|---|
| 《国际造纸》 20011231 文琼菊等 麦草置换蒸煮的小试研究 39-41 1-3 第20卷, 第1期 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391078A (en) * | 2014-09-23 | 2015-03-04 | 王朝辉 | Method for rapidly evaluating poplar soda-AQ pulping process |
| CN104407098A (en) * | 2014-09-23 | 2015-03-11 | 王朝辉 | Rapid method for evaluation of birch caustic soda anthraquinone pulping process |
| CN104407098B (en) * | 2014-09-23 | 2016-04-20 | 黄伟洪 | A kind of method of Fast Evaluation birch soda anthraquinone process technique |
| CN104330525A (en) * | 2014-09-24 | 2015-02-04 | 朱琳 | Method for rapid evaluation of caustic soda- anthraquinone process pulping process of eucalyptus |
| CN104330525B (en) * | 2014-09-24 | 2016-03-23 | 梁朔 | A kind of method of Fast Evaluation Eucalyptus soda anthraquinone process technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101451320B (en) | Grass type low brightness pulp, preparation method and use thereof | |
| CN106381741A (en) | Bamboo chemimechanical pulp bioenzyme pretreatment method | |
| US20090266500A1 (en) | Process for producing tissue paper | |
| Danielewicz et al. | Selected grass plants as biomass fuels and raw materials for papermaking, part II. Pulp and paper properties | |
| CA2297586A1 (en) | Method and apparatus for pulp yield enhancement | |
| Aklilu | Optimization and modeling of ethanol–alkali pulping process of bamboo (Yushania alpina) by response surface methodology | |
| CN102154873A (en) | Method for cooking grass raw materials at two stages with soda anthraquinone by adding black liquor | |
| US3919041A (en) | Multi-stage chlorine dioxide delignification of wood pulp | |
| CN113481741A (en) | Bacterial grass chemical mechanical pulp and preparation method and application thereof | |
| Latibari et al. | Application of alkaline sulfite pulping on corn stalks | |
| CN100398745C (en) | Chemical and machinery pulping process using complete white mulberry branch as raw material | |
| Bhardwaj et al. | Soda and soda-anthraquinone pulping of rice straw | |
| US3737369A (en) | Alkaline digestion of a mixture of cotton linters and fibrous vegetable material and product thereof | |
| Erisir et al. | Alkaline sulphite anthraquinone pulping of caucasian spruce (Picea orientalis L.) chips with added sodium borohydride and ethanol | |
| Erişir et al. | Alkaline sulphite pulping of Caucasian spruce (Picea orientalis L.) chips with additions of NaBH4 and ethanol | |
| CN102493260A (en) | Mixed paper pulp of reed and poplar as well as its production method | |
| Richard et al. | Steam Explosion pulping of bagasse for fine paper production | |
| CN101691708B (en) | Natural-color straw pulp with improved color phase, opacity and freeness, and stable performance | |
| CN101942777B (en) | Natural color straw pulp with improved and stable properties | |
| CN101684627B (en) | Natural-color straw pulp with improved color phase, freeness and bulk and stable performance | |
| CN101691703B (en) | Natural-color straw pulp with improved tearing index, freeness and tensile index, and stable performance | |
| CN101451319B (en) | Low brightness pulp prepared by ammonium sulfite steam cooking straw raw material, preparation method thereof and use thereof | |
| Wu et al. | Preparation of Dissolving Pulp Made from Poplar Residual Slabs and Effect of Xylanase Post-treatment on Its Reactivity. | |
| CN101691709B (en) | Natural-color straw pulp with improved freeness, air permeability and tensile index, and stable performance | |
| CN101691705B (en) | Natural-color straw pulp with improved color phase, freeness and air permeability, and stable performance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110817 |