CN1166836C - Technology for preparing paper pulp from corn stalk - Google Patents
Technology for preparing paper pulp from corn stalk Download PDFInfo
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- CN1166836C CN1166836C CNB991133404A CN99113340A CN1166836C CN 1166836 C CN1166836 C CN 1166836C CN B991133404 A CNB991133404 A CN B991133404A CN 99113340 A CN99113340 A CN 99113340A CN 1166836 C CN1166836 C CN 1166836C
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Abstract
The present invention relates to a technology for preparing paper pulp from corn stalks. The technology comprises the following steps: corn stalks are placed in a cool place and are completely dried, and then, the corn stalks are cut with the length of three to four cm; falling leaves and foreign matters on the outer skin are removed. Stalk cores are removed, and the corn stalks are prepared into raw materials with certain size; then, the raw materials are boiled in cooking liquor with the concentration of 10 to 15 %; the raw materials are taken out and put in water to carry out neutralization reaction; pulp raw materials can be obtained by that the raw materials are dried at high temperature; and the pulp raw materials are dipped for two hours after water is added to the pulp raw materials so that the concentration is regulated to 10%wt/wt. The pulp raw materials are pulped by a PFImill beater by the T249PM-74 method of the TAPPI standard. In the technology, annual corn resources are used as the pulp raw materials, so wood is replaced; the technology has the advantages of simple technology, low cost, easy operation, etc.
Description
Technical field: the present invention relates to a kind of technology of making paper pulp, particularly is the technology that raw material is made paper pulp with the cornstalk.
Background technology: along with development and national economy, the people's living standard improves constantly, and the demand of usefulness paper such as various books, newspaper, paperboard, case paper increases day by day, so the demand cumulative year after year of paper pulp.The coniferous tree of refrigerant latitudes growth many decades is mainly taken from the source of paper pulp raw material at present, in China, the three provinces in the northeast of China's timber that abounds with these seeds is resource-constrained not only, and because felling for many years, original Limited resources has arrived the degree of approaching exhaustion, in view of the situation, policy basic point from now on should be to consider that at first afforestation and forest cultivation are only deforestation then, because the development of paper-making industry will bring deforestation and can cause environmental disruption thus, deforestation papermaking meeting is restricted, and solves new paper pulp raw material like this and comes source problem to become very urgent.
Summary of the invention: task of the present invention is: at the problem that sources of paper pulp faced, exploitation is extracted out from annual grass kind plant and the technology of processing of cellulose and be the technology of raw material manufacturing paper pulp with this cellulose.Task of the present invention realizes as follows: cornstalk is placed on shady and cool place carries out bone dry, it is long to be cut into 3～4cm, removes the fallen leaves and other foreign material that stick on the crust then, after riving the stalk core is removed; Make raw material with a certain size with disintegrating machine and pulverizer; 's 10～15% NaOH or Na with raw material in concentration
2SO
3, Na
2S or Na
2CO
3In the solution, 150 ℃ of temperature, time be to carry out boiling under 2～4 hours the condition; Pull the test portion that passes through boiling out with 100 purpose sieves, take off the thing of pulling out that stays on the screen cloth; Putting into the water deposition neutralizes about time; Drying was paper pulp raw material in 5 hours under 80 ℃ of temperature; With the dried test portion of pulp promptly just paper pulp raw material add water move to after concentration reaches 10%wt/wt, fully soak long-pending more than 2 hours; Press TAPPI standard T249PM-74 method and pull an oar with the PFImill beater, conditions of beating is: specific beating pressure 1.8kg/cm
2, cutter spacing 0.3mm, with 40 ° of SR of beating degree serve as before and after during benchmark, rotation 500 times during making beating in sulfate process, and rotation 1100 times during making beating in alkali sulfite process.The present invention is owing to utilize annual cornstalk resource as paper pulp raw material, like this will be to a large amount of deforestation phenomenons that prevent to produce because of papermaking, thus the conservation of nature environment solves the papermaking raw material and comes source problem, has great economic benefit and social benefit; Technology of the present invention is simple, and cost is low, and is easy to implement, and cornstalk paper pulp raw material used in the present invention has the advantages that any paper pulp raw material did not have in the past simultaneously, can develop traditional Chinese style paper pulp and paper with Chinese characteristic.
The specific embodiment: a preferred forms of the present invention is, cornstalk is placed on shady and cool place carries out bone dry, it is long to be cut into 3～4cm, remove the fallen leaves and other foreign material that stick on the crust then, after riving the stalk core is removed, make the raw material with a certain size with disintegrating machine and pulverizer, it is to be to carry out boiling under 2～4 hours the condition in 10% the NaOH solution, in 150 ℃ of temperature, time that the cornstalk raw material is placed on concentration; Pull the test portion of process boiling then with 100 purpose sieves out, take off the thing of pulling out that stays on the screen cloth; Putting into the water deposition neutralizes about time; Drying was paper pulp raw material in 5 hours under 80 ℃ of temperature; With the dried test portion of pulp promptly just paper pulp raw material add water move to after concentration reaches 10%wt/wt, fully soak long-pending more than 2 hours; Press TAPPI standard T248PM-74 method then and pull an oar with the PFImill beater, conditions of beating is: specific beating pressure 1.8kg/cm
2, cutter spacing 0.3mm, with 40 ° of SR of beating degree serve as before and after during benchmark, rotation 500 times during making beating in sulfate process, and rotation 1100 times during making beating in alkali sulfite process.
Association with pulp bleaching: bleaching has been used hypochlorite of soda, Na (CLO) with reagent
2, chloride of lime, Ca (CLO)
2Deng.With NaOH or sodium metasilicate pH value is adjusted to PH9～PH11.When pulp density was in 4%～6% scope, experimental temperature was decided to be 40 ℃, and when pulp density was in 10%～16% scope, experimental temperature was decided to be 35 ℃.
Make dissolving pulp with acid sulfite process: during with sulphite manufactured dissolving pulp, utilization hydrolysis to greatest extent has the acid sulfite process of dysgenic hemicellulose to steam to the quality of dissolving pulp to separate, and resulting characteristics of pulp is different and different with conditions of cooking.When sulfurous acid concentration increases, the pH value of cooking liquor increases automatically, and is low more in conjunction with the concentration of sulfurous acid, represents indirectly that then the viscosity of cellulosic degree of polymerization is just big more, because at this moment can carry out the hydrolysis of delignification reaction and hemicellulose more selectively, and to cellulose generation decomposition.Though the dissolving pulp that uses when making high-tension tire silk or highly elastic fiber is that the sulfite pulp of boiling under the low pH value condition of highly acid is comparatively suitable, but as matching fine jade powder (glassine paper) etc., when needing to use the dissolving pulp of low polymerization degree, also steam under the PH condition that the pH value that can be regulated than boiling the time is higher and separate.
Make dissolving pulp with sulfate process: during with sulphate cook manufactured dissolving pulp, though also want as sulphite process, under the conditions of cooking of paper grade pulp, make dissolving pulp, but in bleaching process, be difficult to remove the hemicellulose of process alkali treatment stabilisation in digestion process, thereby also be difficult to reach the desired alpha-cellulose purity of dissolving pulp standard.
Hydrolysis-sulfate process is given in utilization, can be by being hydrolyzed as giving the method that hydrolysising condition adds sulfuric acid or sulfurous acid, and also can under only adding the condition that water carries out heat, utilize the oxalic acid that from timber, generates that hemicellulose is hydrolyzed.But according to the purposes and the relative quality requirement difference thereof of dissolving pulp, service condition is also inequality.Usually use 0.5%H
2SO
4The aqueous solution carries out handling in 0.5～2 hour under 150～180 ℃ condition, after separating through waste liquid, adopts the conditions of cooking identical with paper grade pulp, and the sulphidity 25% of composition requirement press to(for) wood of coniferous tree adds NaOH+Na
2S and 20% Na
2O is for the requirement adding NaOH+Na of broad leaf tree timber by sulphidity 25%
2S and 16% Na
2O, boiling is 90 minutes under 170 ℃ of temperature conditions.
The bleaching process of dissolving pulp: when paper pulp is bleached, use oxidant usually, and, use chlorine in order only to remove residual lignin in the phase I.In the displacement reaction of chlorination stage by chlorine and lignin, promote next step aqueous slkali, make it carry out oxidation Decomposition and be beneficial to stripping, and with unrighted acid, resin acid and steam and separate thing and react, realize hydrophobization.After the chlorination, and then carry out thermokalite and extract out, at this moment aliphatic acid, cured and other lipid component also carry out basic hydrolysis (saponification), make that fat is free to be the soap state, steam with dissolving and separate thing and decomposed lignin fragment.Extract the stage out at alkali, the most effective surfactant is the nonyl phenol (nonyl phenol) with polyethylene glycol (polyentylene glycol) branch.But the whiteness of paper pulp then adopts the method for bleaching identical with paper grade pulp, uses hypochlorous acid, chlorine dioxide or hydrogen peroxide to bleach in succession, to improve the whiteness of paper pulp.Therefore, dissolving pulp adopts the conditions of bleaching identical with paper grade pulp.
Remove the method for foreign body after the bleaching:
Adding the thermokalite depressed extracts out: the bleaching of dissolving pulp is different with paper grade pulp, in order to remove the hemicellulose that exists in the paper pulp or the catabolite of chlorination simultaneously, through behind the chlorination stage, adds and depresses the thermokalite extraction.This method is mainly used in the bleaching of the dissolving pulp that makes by sulphite process, different with the bleaching of paper grade pulp, it is that NaOH is (in 4～12%NaOH/pulp) the soda lye that paper pulp is joined concentration, after making it to become 12～18% paper pulp, under the state of 95～145 ℃ high temperature and pressurization, handled 1～2 hour.But, to high alpha-cellulose, can only under 120 ℃ of conditions, handle 3 hours, can cause cellulosic decomposition because surpass this temperature.
Cold alkali is extracted out: because carried out the high temperature basic treatment with the dissolving pulp of prehydrolysis-sulfate process manufacturing in the boiling stage, so do not have effect with the thermokalite extraction, therefore, this dissolving pulp is general to adopt cold alkali treatment method to make with extra care.Usually, working concentration is lower than 18% NaOH solution during cold alkali treatment, handles under the temperature below 40 ℃.When low temperature, mainly based on the physical property run-inflation effect, the low more swollen degree of temperature is big more, still, if swollen spend greatly, to removing caustic soda later on and filtering and washing brings difficulty.On the contrary, when temperature was high, the swollen degree reduces can make later processing carry out easily, if but temperature is higher than 35 ℃, then the content of alpha-cellulose will descend, and when reaching 50 ℃, the content of alpha-cellulose drops to minimum, yield is increased, therefore, the temperature that industrial employing is about 35 ℃.On the other hand, make highly purified dissolving pulp, it is more effective than single treatment to carry out cold alkali treatment repeatedly, will use the thermokalite-cold alkali treatment method of cold alkali treatment more effective again through the dissolving pulp that contains 95.5% alpha-cellulose that hot alkali treatment obtains.That is, best thermokalite-cold alkali treatment method of making the ultra-high purity dissolving pulp is with after the hot alkali treatment, under 10～15 ℃ of temperature, handles with 11～12% NaOH solution.If under 18 ℃ of temperature conditions, carry out cold alkali treatment with the NaOH of 130/L, can obtain 95.5% alpha-cellulose.During with the high concentration caustic soda, since run-inflation effect almost with contact simultaneously generation, so can carry out the short time handles, but, consider factors such as the dissolving that is present in the impurity in the fiber internal layer and diffusion, the actual processing time of adopting was from 10～30 minutes to 3 hours, and is different with the actual conditions of factory.When carrying out cold alkali treatment, to produce oxidative phenomena very serious owing to the effect of oxygen in the air, should be noted especially, after the cold alkali treatment, washs after making pulp density reach 45% with spiral or the pressurization of dise press machine.
The physical property of dissimilar paper pulp compares: measure the alkaline pulp of being made by pure cornstalk, the specific volume result of alkaline sulfite paper pulp, the bulking value maximum of alkaline pulp.The paper pulp that this explanation is handled with caustic soda has soft filamentary structure, and its fiber is discongested and is loose tissue.Compare TENSILE STRENGTH, the measured value maximum of kraft pulp, it is best to show that its steaming is separated, and major part is made of bacillar structure.Compare rupture strength and folding strength, the result still is the intensity maximum of kraft pulp, but tearing strength then is the measured value maximum of alkaline sulfite cellulose.The paper test piece that needle kraft pulp with about 60% and 40% alkaline pulp, kraft pulp, alkaline sulfite cellulose are made after mixing respectively, its physical property is superior more than the paper of being made by pure cornstalk paper pulp.Above-mentioned three kinds of paper pulp, promptly the bulking value of alkaline pulp, kraft pulp, alkaline sulfite cellulose is identical with pure cornstalk paper pulp substantially.But the TENSILE STRENGTH of these three kinds of paper pulp has all improved more than 2 times, and rupture strength has improved more than 2 times, and especially folding strength has improved more than 70 times, and high-temperature capability has then improved more than 5 times.This result shows that cornstalk paper pulp has very big exploitation value aspect physical property and the economy.By the special performance of homemade cornstalk in proceeding more deep experiment and research, will produce to have and the quality pulp and the paper of traditional Chinese paper characteristics, make very big contribution thereby the rural economy of developing china and the economy that improves the peasant received.
The physical property of invention product: the physical property test result of the paper test piece made from cornstalk paper pulp is as shown in the table.
The bleached paper test piece performance test value of making by pure cornstalk paper pulp
| Project | Bleaching alkalescence | Bleached kraft pulp | Bleach alkaline sulfite pulp | Bleaching coniferous tree kraft pulp (NBKP) |
| Specific volume (m/g) | 2.15 | 1.87 | 1.92 | 2.12 |
| TENSILE STRENGTH (Nm/g) | 17.52 | 28.82 | 23.12 | 39.40 |
| Rupture strength Nm/g | 0.08 | 0.15 | 0.12 | 0.41 |
| Folding strength (number of times) | 1.38 | 2 | 1.67 | 4.36 |
| Tearing strength (Nm/g) | 0.43 | 0.41 | 0.46 | 2.59 |
Claims (1)
1, a kind of cornstalk is the technology that raw material is made paper pulp, it is characterized in that
A. cornstalk is placed on shady and cool place and carries out bone dry, it is long to be cut into 3～4cm, removes the fallen leaves and other foreign material that stick on the crust then, after riving the stalk core is removed;
B, make raw material with disintegrating machine and pulverizer with a certain size;
C, with raw material in concentration is 10% NaOH solution, 150 ℃ of temperature, time be to carry out boiling under 2～4 hours the condition;
D, pull raw material through boiling out, take off the thing of pulling out that stays on the screen cloth with 100 purpose sieves;
E, put into the water deposition and about time neutralize;
F, under 80 ℃ of temperature, be paper pulp raw material in dry 5 hours;
G, be that paper pulp raw material adds water move to after concentration reaches 10%wt/wt, fully soak long-pending more than 2 hours the dried test portion of pulp;
H, press TAPPI standard T249PM-74 method with the making beating of PFImill beater, conditions of beating is: specific beating pressure 1.8kg/cm
2, cutter spacing 0.3mm, with 40 ° of SR of beating degree serve as before and after during benchmark, rotation 500 times during making beating in sulfate process, and rotation 1100 times during making beating in alkali sulfite process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991133404A CN1166836C (en) | 1999-10-13 | 1999-10-13 | Technology for preparing paper pulp from corn stalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991133404A CN1166836C (en) | 1999-10-13 | 1999-10-13 | Technology for preparing paper pulp from corn stalk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1293284A CN1293284A (en) | 2001-05-02 |
| CN1166836C true CN1166836C (en) | 2004-09-15 |
Family
ID=5276540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991133404A Expired - Fee Related CN1166836C (en) | 1999-10-13 | 1999-10-13 | Technology for preparing paper pulp from corn stalk |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1166836C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100529251C (en) * | 2006-02-28 | 2009-08-19 | 王军旗 | Method for producing paper pulp utilizing herbal plant, crop stalk and ore powder |
| CN102561094A (en) * | 2012-01-06 | 2012-07-11 | 黑龙江浩源生物科技有限公司 | Method for making pulp and paper by using cornstalk xylose residue |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1299595A4 (en) | 2000-06-29 | 2004-06-23 | Bncompulp Co Ltd | Method for preparing pulp from cornstalk |
| CN100381636C (en) * | 2004-07-23 | 2008-04-16 | 山东泉林纸业有限责任公司 | Bleaching method of cotton stalk chemical pulp |
| CN100381638C (en) * | 2004-07-23 | 2008-04-16 | 山东泉林纸业有限责任公司 | Method of preparing paper product using cotton stalk chemical pulp |
| CN100381635C (en) * | 2004-07-23 | 2008-04-16 | 山东泉林纸业有限责任公司 | Method of preparing bleached chemical pulp using cotton stalk |
| CN101613969B (en) * | 2008-06-25 | 2011-08-31 | 山东中科润环保科技有限公司 | Pulping process for paper product pulp |
| CN101671974B (en) * | 2008-09-11 | 2011-01-19 | 山东太阳纸业股份有限公司 | Sunflower stalk pulping technology |
| CN103556522B (en) * | 2013-11-06 | 2016-10-26 | 济南圣泉集团股份有限公司 | The application in preparing paper for daily use of a kind of corn cob fiber |
| CN103952941B (en) * | 2014-05-08 | 2016-06-29 | 临沂市清宇环境资源综合利用研究院 | A kind of method utilizing garlic skin to manufacture paper pulp |
| CN105442370B (en) * | 2015-11-27 | 2017-12-22 | 福建农林大学 | A kind of method that bleached bamboo pulp plate prepares dissolving pulp |
-
1999
- 1999-10-13 CN CNB991133404A patent/CN1166836C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100529251C (en) * | 2006-02-28 | 2009-08-19 | 王军旗 | Method for producing paper pulp utilizing herbal plant, crop stalk and ore powder |
| CN102561094A (en) * | 2012-01-06 | 2012-07-11 | 黑龙江浩源生物科技有限公司 | Method for making pulp and paper by using cornstalk xylose residue |
| CN102561094B (en) * | 2012-01-06 | 2015-04-15 | 黑龙江浩源生物科技有限公司 | Method for making pulp and paper by using cornstalk xylose residue |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1293284A (en) | 2001-05-02 |
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