CN103696310A - Wheat straw sulfate pulping and alkali recovery efficiency improving method - Google Patents
Wheat straw sulfate pulping and alkali recovery efficiency improving method Download PDFInfo
- Publication number
- CN103696310A CN103696310A CN201410013098.4A CN201410013098A CN103696310A CN 103696310 A CN103696310 A CN 103696310A CN 201410013098 A CN201410013098 A CN 201410013098A CN 103696310 A CN103696310 A CN 103696310A
- Authority
- CN
- China
- Prior art keywords
- alkali
- wheat straw
- sodium
- digestion
- sodium sulfite
- 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
Images
Abstract
The invention belongs to a non-wood chemical pulping technology in a papermaking field, and relates to a novel method improved specific to a wheat straw sulfate process digestion technology. The novel method is characterized in that sodium sulfite is used for replacing sodium sulfate so as to realize the cyclic utilization of alkali in a wheat straw sulfate process pulping technology, the supplementation of lost alkali and sulphur and the maintenance of balance between sodium and sulfur of a system; and the sodium sulfite is added in a digestion working section and can assist in the removal of lignin in a wheat straw sulfate process digestion process, improve the dissolution property of the lignin, increase the yield of paper pulp, alleviate a digestion alkaline condition, reduce the dissolution of silicon in wheat straw raw materials and create conditions for improving the recovery efficiency of alkali. The novel method is improved specific to a conventional wheat straw digestion and alkali recovery system without needing major adjustment and is easy to realize in practical production.
Description
Technical field
The invention belongs to the chemical pulping technology of field of papermaking, for wheat straw sulfate pulping, with sodium sulfite, substitute the new method that sodium sulphate is realized alkali recycle and reuse, improved pulp quality and alkali recovering effect.
Background technology
Sulfate pulping technology, because its perfect chemical recovery system has become main chemical pulping method in the world, is generally applied to the production of wood raw material chemical pulp.China's grass as raw material slurrying is on traditional timber sulfate pulping basis, to have developed the boiling pattern that low temperature high speed cooking combines with caustic soda-anthraquinone method boiling continuing to use.Along with paper industry development, grass as raw material clean and effective slurrying new technology more and more causes people's concern and study hotspot.In < < Paper Industry Development " 12 " planning > >, establish paper industry and take waste paper fibre, xylon as main, rationally utilized the raw material route of the renewable resources such as bamboo, reed and stalk.Stalk fibrid raw material was once one of important fibrous raw material of China's pulp and paper industry, one of slurry kind that Straw Pulp Ye Shi China is important, although Qi China paper pulp kind proportion declines to some extent, slurry total output keeps relative stability.The key technical problem facing at grass as raw material cleaning pulping is black liquor pollution problem, and the alkali that therefore how to solve black liquor reclaims, and realizes the Efficient Cycle of alkali, and the Organic Pollution tool that reduces digestion process is of great significance.
Cleaning pulping problem for grass as raw material, a lot of experts and scholars both domestic and external have carried out many-sided research, such as utilizing, in soda-aq cooking boiling, add sodium sulfite to relax digesting technoloy, to adopt the boiling methods such as formaldehyde-sodium sulfite-anthraquinone boiling, alkali sulfite process and oxygen-alkaline boiling, reduce the stripping of digestion process silicon or stripping silicon is adsorbed to fiber surface again, reduce the impact that silicon disturbs, improve Pulp Drainage Properties, the cooking waste liquor after sulphite boiling is processed is mainly used to the comprehensive utilization of lignin.The sharpest edges of sulfate pulping are to utilize the front interpolation of black-liquor combustion sodium sulphate method to realize supplementary alkali and vulcanized sodium is realized the recycle of alkali and vulcanized sodium and the balance that keeps sodium and sulphur.The present invention utilizes sodium sulfite to substitute sodium sulphate, can reduce the stripping of material cooking process silicon, for the recycle and reuse of alkali after straw cooking creates good conditions.
Summary of the invention
The object of the invention is in order to solve grass as raw material silicone content highly, the easier stripping of common alkaline process digestion process, causes that black liquor viscosity is large, volatility is poor, alkali reclaims the problems such as difficulty, is difficult to realize the cleaner production of wheat straw chemical pulping.Therefore the corresponding problem that, considers straw cooking and chemical recovery system is to solve the core that Wheat Straw Pulp slurrying is polluted.
To achieve these goals, the technical solution used in the present invention is:
For kraft cooking black liquor alkali recovery process by after Black Liquor Concentration before sending into combustion furnace, sneak into a certain amount of saltcake (sodium sulphate) with sulphur and the sodium of replenish lost.The present invention utilizes sodium sulfite to substitute needs supplementary sodium sulphate, but adding decoction system position to adjusts, the sodium sulfite of appropriate amount 0.5-5% (with respect to over dry raw material) is added in cooking liquor, the interpolation of sodium sulfite, both can in digestion process, increase delignified effect, the washing dispersibility of dissolved lignin promotes, again can replenishment system alkali recovery process sodium and the loss of sulphur, realize the balance of sodium and sulphur.
By utilizing wheat straw to carry out caustic soda-anthraquinone method, sulfate process, alkali sulfite process and sodium sulfite-kraft cooking, study, result shows, after boiling, the evaporation process viscosity variation characteristic difference of black liquor is obvious, after caustic soda-anthraquinone method boiling, black liquor produces viscosity sudden change under relatively low concentration conditions, secondly be sulfate process, then be alkali sulfite process, comparatively speaking, after sodium sulfite-kraft cooking, black liquor viscosity sudden change relative concentration is higher.This research is higher to be shown when kraft cooking Straw Pulp, can effectively improve the mobile performance of black liquor after boiling, is conducive to improve in evaporation process the concentration of black liquor, for improving grass as raw material black-liquor combustion performance, creates good conditions.
Kraft cooking liquid active ingredient is NaOH and Na
2s, digestion process utilizes OH
-, S
2-by lignin molecule fragmentation, increase the solubility property of lignin with the nucleophilic performance of HS-, make fibrous raw material be dissociated into single fiber, and become chemical pulp.In alkali recovery process, add sodium sulphate (Na
2sO
4) after, the reducibility carbon that can utilize black-liquor combustion process to produce is converted into vulcanized sodium by sodium sulphate.In adding the sulphate cook process of sodium sulfite, that in cooking liquor, participate in reaction is not only NaOH and Na
2the OH of S
-, S
2-with the nucleopilic reagent of HS-, also has the sulfite ion (SO adding
3 2-).The soda cooking of comparing, under the condition of identical alkali charge, sulfate process is because part alkali in alkali charge is replaced relatively having relaxed its alkalescence by vulcanized sodium, thereby reduced the stripping of element silicon in the stripping, particularly wheat straw raw material of alkali lyotrope matter in raw material, in the kraft cooking research of adding sodium sulfite, found, the silicon that can further reduce in raw material is dissolved in black liquor, improve digestion process delignification and lead, reduce silicone content in black liquor, and improve paper pulp yield.Meanwhile, because digestion process has produced a certain amount of lignosulfonates, be also conducive to improve washing and the water filtering performance of paper pulp after boiling, improve the recovery rate of black liquor.
The invention solves the problem that sulphite digestion process can not carry out chemicals circulation.Lignosulfonate in order to utilize the sulfonating reaction of lignin to generate often while conventionally adding the boiling, alkaline sulfite, neutral sulfite of sulphite and acid accumulator sulfite boiling, be prepared as lignin product and sell, but not utilize the mode of burning to carry out the circulation of chemicals in factory.Utilize combustion method to carry out waste liquid while reclaiming, sodium sulfite when burning with lignin simultaneously, and it is finally converted into fused mass that vulcanized sodium produces after along with burning and in combustion furnace, flows out and be dissolved in water.The present invention has just utilized sulphite can be converted into the feature of vulcanized sodium in chemical recovery system, by adding sodium sulfite at cooking section, both favourable to digestion process, also can be conducive to alkali reclaims, realized the balance of sodium and sulphur and recycled, for the production of Wheat Straw Pulp provides new way.
Therefore, the present invention can simply transform for existing Wheat Straw Alkaline production procedure, at cooking section, increase dissolving tank, the saltcake that original kraft cooking need to be added, press corresponding proportion, in dissolving tank, dissolve sodium sulfite, add kraft liquor to, reach and improve pulp property, improve delignification and lead, improve black liquor properties and solve chemical recovery system balance and realize the object that improves alkali recovery efficiency.
Accompanying drawing explanation
Before Fig. 1 improves, traditional kraft cooking and alkali recovery process flow chart
After Fig. 2 improves, add kraft cooking and the alkali recovery process flow chart of sodium sulfite
The specific embodiment
Sodium sulfite substitutes the new method that sodium sulphate is applied to improve wheat straw sulfate pulping and alkali recovery efficiency:
Below in conjunction with chart and embodiment, describe embodiments of the present invention in detail.
The wheat straw raw material of taking from paper mill, Jiangsu of take is example:
Wheat straw raw material is cut into 4cm left and right, be contained in plastic pocket, equilibrium water conten, standby:
Comparative example:
Caustic soda-anthraquinone method:
Sulfate process:
Comparative example:
Sodium sulfite-sulfate process
After gained straw cooking, index is as follows:
Claims (3)
1. take wheat straw as raw material, adopt sodium sulfite to substitute sodium sulphate and realize wheat straw kraft cooking and the recovery of black liquor alkali, maintain the balance of system sodium and sulphur.
2. the sodium sulfite that supplements alternative sodium sulphate according to claim 1 is dissolved in cooking liquor, and sodium sulfite consumption is 0.5-5% (with respect to over dry raw material), and after boiling, black liquor carries out alkali recovery by combustion method, realizes the recycle of alkali.
3. according to claim 1, while adding the kraft cooking of sodium sulfite, alkali charge is 10-15% (NaOH meter, to over dry raw material), and sulphidity is 15-35%, boiling maximum temperature is 150-160 ℃, temperature retention time is 30-90 minute, and system has the alkali matching and reclaims enforcement, and the sulphur in system is reduced to vulcanized sodium, maintain the stable of sulphidity, realize alkali and sulfur balance and recycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013098.4A CN103696310A (en) | 2014-01-13 | 2014-01-13 | Wheat straw sulfate pulping and alkali recovery efficiency improving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013098.4A CN103696310A (en) | 2014-01-13 | 2014-01-13 | Wheat straw sulfate pulping and alkali recovery efficiency improving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103696310A true CN103696310A (en) | 2014-04-02 |
Family
ID=50357963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410013098.4A Pending CN103696310A (en) | 2014-01-13 | 2014-01-13 | Wheat straw sulfate pulping and alkali recovery efficiency improving method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103696310A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537342A (en) * | 2018-11-08 | 2019-03-29 | 福建省青山纸业股份有限公司 | A kind of sulphate pulp processes adding sodium sulfite |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108206A (en) * | 1985-11-11 | 1987-05-20 | 轻工业部造纸工业科学研究所 | Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite |
| WO1992020856A1 (en) * | 1991-05-13 | 1992-11-26 | H.A. Simons Ltd. | White liquor preparation and pulping process |
| CN102587180A (en) * | 2012-01-13 | 2012-07-18 | 大连工业大学 | Alkyl sulfonate cooking auxiliary agent |
| CN103103844A (en) * | 2013-01-16 | 2013-05-15 | 天津理工大学 | Sodium hydroxide wheat straw normal-pressure pulping method using microwave radiation |
-
2014
- 2014-01-13 CN CN201410013098.4A patent/CN103696310A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108206A (en) * | 1985-11-11 | 1987-05-20 | 轻工业部造纸工业科学研究所 | Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite |
| WO1992020856A1 (en) * | 1991-05-13 | 1992-11-26 | H.A. Simons Ltd. | White liquor preparation and pulping process |
| CN102587180A (en) * | 2012-01-13 | 2012-07-18 | 大连工业大学 | Alkyl sulfonate cooking auxiliary agent |
| CN103103844A (en) * | 2013-01-16 | 2013-05-15 | 天津理工大学 | Sodium hydroxide wheat straw normal-pressure pulping method using microwave radiation |
Non-Patent Citations (1)
| Title |
|---|
| 谢来苏等主编: "《制浆原理与工程》", 31 May 2001, article "化学法制浆" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537342A (en) * | 2018-11-08 | 2019-03-29 | 福建省青山纸业股份有限公司 | A kind of sulphate pulp processes adding sodium sulfite |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109577072B (en) | Method for preparing bio-mechanical raw color paste from wheat straws | |
| CN109577059B (en) | Method for preparing biomechanical unbleached pulp by wheat straw | |
| CN102677532B (en) | Process for preparing cultural paper by utilizing full-recovered pulp | |
| CN103382671B (en) | Clean pulping technology for high-polymerization-degree bamboo pulp | |
| CN104532641A (en) | Energy-saving, environmental-protection and resourced pulping method of plant fibers | |
| CN103334328A (en) | Method for preparing bleached pulp by using eucalyptus wood chips | |
| CN109179845A (en) | A kind of disposal of resources method of sulfate method pulp black liquor | |
| CN101514529A (en) | Method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process and product thereof | |
| CN103726377A (en) | Clean pulping method for low-polymerization degree bamboo pulp | |
| CN104195876A (en) | Environmental-friendly advertisement magazine paper and manufacturing method thereof | |
| CN103174047A (en) | Process for refining wheat-straw pulp by hydrogen peroxide enzyme method | |
| CN104790241A (en) | Clean preparing method for high-purity and high-quality bamboo dissolving pulp | |
| CN107414989A (en) | A kind of method that displacement cooking produces high yield pulp1 true qualities bamboo pulp | |
| CN101187181A (en) | Alkaline method for zero-residual alkaline boiling pulp making method | |
| CN105839449B (en) | A kind of clean method for preparing of viscose grade bamboo pulp | |
| CN107119477B (en) | A kind of sinocalamus latiflorus true qualities paper pulp and its preparation process | |
| CN103526629B (en) | Pulping process of waste paper with high wet strength | |
| CN103556249B (en) | A kind of palm viscose and preparation method thereof | |
| CN102677504B (en) | Manufacturing process of antibacterial bamboo pulp used for high-wet-modulus fibre | |
| CN107988835B (en) | Method for preparing high-yield natural-color bamboo pulp by low-temperature displacement impregnation | |
| CN101514530A (en) | Method for preparing bagasse dissolving pulp by improved prehydrolysis alkaline process and product thereof | |
| CN103696310A (en) | Wheat straw sulfate pulping and alkali recovery efficiency improving method | |
| CN1995495B (en) | Bamboo pulp fiber suitable for nitrocellulose, cellulose acetate and cellulose fiber and its production method | |
| CN104032607A (en) | High-yield natural-color wood pulp production method | |
| CN102174753A (en) | Preparation method of wood pulp for long viscose fibers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140402 |