CN103864961A - Method for extracting semi-fibers of regenerated cellulose fiber impregnation liquid and application of semi-fibers - Google Patents
Method for extracting semi-fibers of regenerated cellulose fiber impregnation liquid and application of semi-fibers Download PDFInfo
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- CN103864961A CN103864961A CN201410091864.9A CN201410091864A CN103864961A CN 103864961 A CN103864961 A CN 103864961A CN 201410091864 A CN201410091864 A CN 201410091864A CN 103864961 A CN103864961 A CN 103864961A
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Abstract
The invention provides a treatment method for semi-fibers in impregnation alkali liquid for producing viscose by taking pulp, caustic soda and carbon disulfide as raw materials and application thereof and particularly relates to a method for extracting the semi-fibers of the regenerated cellulose fiber impregnation liquid and application of the semi-fibers. The method is a method for extracting the semi-fibers of the regenerated cellulose fiber impregnation liquid by membrane concentration and centrifuging and comprises the following steps: diluting pressed liquid for three times and carrying out membrane concentration for three times to obtain concentrated liquid with the alkali concentration of 26.5g/l and the semi-fiber concentration of 65g/l; extracting the concentrated liquid by using a centrifuging machine to obtain semi-fiber solids. The semi-fiber solids are used for blending an acid bath in a regenerated cellulose fiber production ice bath workshop; the semi-fibers are sprayed and dried and are used for producing xylitol. By virtue of adopting the method, the semi-fibers are extracted from the impregnation alkali liquid and the semi-fibers in the alkali liquid are extracted to be used for other fields; the amount of the semi-fibers is controlled so as to be good for whole production of the viscose; the utilization range of raw materials is enlarged, the quality of finished products is improved and the production cost is reduced; the overall efficiency is better than that of the prior art.
Description
Technical field
The present invention relates to a kind ofly taking by pulp, caustic soda, dithiocarbonic anhydride half fine treatment process in the steeping lye of raw material production viscose fiber, particularly relate to a kind of the extract fine method of regenerated cellulose fibre steeping fluid half and half fine application.
Background technology
Conventional regeneration cellulosic fibre production technique is with pulp, caustic soda, dithiocarbonic anhydride is raw material production viscose glue, due to the half fine product yield that directly affects of dissolving in alkali lye, production efficiency, must control half fibre in alkali lye, traditional way is dialysis, substantially be eliminated because efficiency is low, next is the nanofiltration membrane treatment technology that first Xingda Tangshan Sanyou Group Chemical Fiber Co is used, because half fibre after treatment does not really propose from system, half fine height still restricts production, concentrated and the centrifugal separation technique in conjunction with ultrafiltration classification, really half fibre being extracted to recycling from alkali lye system is the key of our this technology.From certain angle, the controllability of half fibre in alkali lye, directly whether decision can use the pulp that grade is lower, thereby eliminate at present because of the restriction of raw material supply deficiency to industry development, also for slurry industry made of paper provides new Application Areas, realize inter-trade Linking Development, promote the common progress of China's viscose fiber production technology and paper-making pulping industry.
Summary of the invention
The object of the invention is the defects such as low for the fine processing power of prior art half, cost is high, waste material is difficult, the same form provides a kind of and adds centrifugation extraction regenerated cellulose fibre steeping fluid half fibre with membrane concentration, and method is simple and easy to the method for extraction regenerated cellulose fibre steeping fluid half fibre of manipulation.Two are to provide a kind of application of half fibre.
Realize above-mentioned purpose and adopt following methods:
Extract the fine method of regenerated cellulose fibre steeping fluid half, described method is to add the fine method of centrifugal extraction regenerated cellulose fibre steeping fluid half with membrane concentration, and concrete steps comprise:
(1) half fine just carrying:
Dilute pressed liquor with soft water: selecting pressed liquor is raw material, adds soft water to dilute,
Dilute for the first time, concentrate: charging stock tank injects 45% volume pressed liquor, then toward the soft water that adds 45% liquid level in charging stock tank, after circulation, obtaining containing alkali concn is 115 grams per liters, half fine concentration is the pressed liquor of 27.5 grams per liters, obtaining containing alkali concn by membrane concentration is 115 grams per liters, and half fine concentration is the concentrated solution of 53 grams per liters;
Dilute for the second time, concentrate: charging stock tank is left 45% volume concentrated solution, add the soft water of 45% volume liquid level, after circulation, obtaining containing alkali concn is 58 grams per liters, half fine concentration is the pressed liquor of 26.5 grams per liters, obtaining containing alkali concn by membrane concentration is 26.5 grams per liters, half fine concentration is the concentrated solution of 51 grams per liters, and liquid level is that 45%. concentration ratios are 50%;
Dilution for the third time: charging stock tank is left 45% volume concentrated solution, add the soft water of 45% liquid level, after circulation, obtaining containing alkali concn is 26.5 grams per liters, half fine concentration is the hydraulic fluid of 25.5 grams per liters, obtaining containing alkali concn by membrane concentration is 26.5 grams per liters, half fine concentration is the concentrated solution of 65 grams per liters, and liquid level is 35%, and concentration ratio is 65%;
(2) centrifugally carry again:
By step 1 dilute for the third time get Dao ?liquid put into tubular-bowl centrifuge, tubular-bowl centrifuge, with the high half fine low alkali lye containing alkali of the 16000 rotating speed centrifugations that turn, obtains half fine solid.
Further, described pressed liquor is 230 grams per liters containing alkali concn, and half fine concentration is 55 grams per liters.
Further, concentrated half fibre of described membrane filtration is fine to 65g/l half, sodium hydrate content≤30g/l.
By fine regenerated cellulose fibre steeping fluid half solid through H
2sO
4in and desalination, the Na of removal
2sO
4for the allotment acid bath of regenerated cellulose fibre production acid bath workshop, partly fibre is spray-dried produces for Xylitol.
Adopt technique scheme, compared with prior art, present method can be directly from being to extract half fibre the steeping lye of raw material production viscose fiber with pulp, caustic soda, dithiocarbonic anhydride, extract half in alkali lye fine for other aspects, such as manufacturing Xylitol, in system, half fine amount is conducive to viscose fiber integral production after controlled, and expand the use range of raw material, improve quality of finished, reduce production costs, overall efficiency is better than prior art.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described, and its production method comprises the steps:
1, half finely just carries (what require system is 30 grams per liters (below) containing alkali concn, half fine concentration be 65 grams per liters (more than):
Soft water dilution: selecting containing alkali concn is 230 grams per liters, and half fine concentration is that the pressed liquor of 55 grams per liters is raw material, adds soft water to dilute, dilutes three times, concentrated number of times three times.Concrete operation step is as follows:
Dilute for the first time, concentrated: to inject 45% liquid level pressed liquor (be 230 grams per liters containing alkali concn to charging stock tank by volume, half fine concentration is 55 grams per liters), then add the soft water of 45% liquid level, after circulation, obtaining containing alkali concn is 115 grams per liters, half fine concentration is the hydraulic fluid of 27.5 grams per liters, obtaining containing alkali concn by membrane concentration is 115 grams per liters, and half fine concentration is the concentrated solution of 53 grams per liters, and liquid level is that 45%. concentration ratios are 50%.
Dilute for the second time, concentrate: charging stock tank is left 45% liquid level concentrated solution, add the soft water of 45% liquid level, after circulation, obtaining containing alkali concn is 58 grams per liters, half fine concentration is the hydraulic fluid of 26.5 grams per liters, obtaining containing alkali concn by membrane concentration is 26.5 grams per liters, half fine concentration is the concentrated solution of 51 grams per liters, and liquid level is that 45%. concentration ratios are 50%.
Dilution for the third time: charging stock tank is left 45% liquid level concentrated solution, add the soft water of 45% liquid level, after circulation, obtaining containing alkali concn is 26.5 grams per liters, half fine concentration is the hydraulic fluid of 25.5 grams per liters, obtaining containing alkali concn by membrane concentration is 26.5 grams per liters, half fine concentration is the concentrated solution of 65 grams per liters, and liquid level is that 35%. concentration ratios are 65%.
2, centrifugally carry again:
Adopt tubular-bowl centrifuge to carry again: by get after five dilutions Dao ?liquid put into tubular-bowl centrifuge, tubular-bowl centrifuge, with the high half fine low alkali lye containing alkali of the 16000 rotating speed centrifugations that turn, obtains half fine solid.
The application of half fine solid:
Half fine solid is in H2SO4 and desalination, and the Na2SO4 of removal is for the allotment acid bath of regenerated cellulose fibre production acid bath workshop, and half fine spray-driedly produces for Xylitol.
The principle of work of tubular-bowl centrifuge: tubular-bowl centrifuge Jiang ?liquid material injected the rotary drum of high speed rotating by bottom liquid inlet mouth, all-steel structure, double-layer plate protection, rotary drum top is to form powerful centrifuge field after flexible main shaft adjustment rotation, feed liquid is upwards flowed along drum inner wall, and the actual capacity of tubular-bowl centrifuge is depending on separating medium and separating effect.Sample is very little in the amplitude of temperature rise producing with air high speed rotary grinding, and the larger solia particle of effect lower density of centrifuge field is deposited on gradually drum inner wall and forms sediment layer.Under normal temperature, the solubleness of hemicellulose in alkali lye reduces with the reduction of alkali concn.As long as half fine content also can not be separated out in the high short period of time again in alkaline solution, be always suspended in alkali lye in addition.Root reaches 16300 according to rotating speed in the principle of work short period of time of tubular-bowl centrifuge and turns, and separates the high half fine low alkali lye containing alkali.
Pressed liquor of the present invention is 230 grams per liters containing alkali concn, and half fine concentration is 55 grams per liters.
Alkaline-resisting organic membrane for the present invention (filtering accuracy 200 molecular weight), leaches small molecules and holds back macromole and reach concentrated half fine object, and filtering and concentrating half is fine fine to 65g/l half, sodium hydrate content≤30g/l.
After tubular-bowl centrifuge (centrifugal factor 15600G) centrifugation, the fine paste of high density half falls to transfers shares on inwall, and thickness is attenuation gradually from bottom to top, flow out from dope mouth, after washing, through ram pump send into spray-drier spray dry, the finished product of packing out.
Above-described embodiment has only been expressed one embodiment of the present invention, but can not therefore be interpreted as limitation of the scope of the invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (4)
1. extract the fine method of regenerated cellulose fibre steeping fluid half, it is characterized in that, described method is to add the fine method of centrifugal extraction regenerated cellulose fibre steeping fluid half with membrane concentration, and concrete steps comprise:
(1) half fine just carrying:
Dilute pressed liquor with soft water: selecting pressed liquor is raw material, adds soft water to dilute,
Dilute for the first time, concentrate: charging stock tank injects the pressed liquor of 45% volume, then toward the soft water that adds 45% volume in charging stock tank, after circulation, obtaining containing alkali concn is 115 grams per liters, half fine concentration is the pressed liquor of 27.5 grams per liters, obtaining containing alkali concn by membrane concentration is 115 grams per liters, and half fine concentration is the concentrated solution of 53 grams per liters;
Dilute for the second time, concentrate: charging stock tank is left 45% volume concentrated solution, add 45% volume soft water, after circulation, obtaining containing alkali concn is 58 grams per liters, half fine concentration is the pressed liquor of 26.5 grams per liters, obtaining containing alkali concn by membrane concentration is 26.5 grams per liters, half fine concentration is the concentrated solution of 51 grams per liters, and liquid level is that 45%. concentration ratios are 50%;
Dilution for the third time: charging stock tank is left 45% volume concentrated solution, add the soft water of 45% liquid level, after circulation, obtaining containing alkali concn is 26.5 grams per liters, half fine concentration is the hydraulic fluid of 25.5 grams per liters, obtaining containing alkali concn by membrane concentration is 26.5 grams per liters, half fine concentration is the concentrated solution of 65 grams per liters, and liquid level is 35%, and concentration ratio is 65%;
(2) centrifugally carry again:
By step 1 dilute for the third time get Dao ?liquid put into tubular-bowl centrifuge, tubular-bowl centrifuge, with the high half fine low alkali lye containing alkali of the 16000 rotating speed centrifugations that turn, obtains half fine solid.
2. the fine method of extraction regenerated cellulose fibre steeping fluid according to claim 1 half, is characterized in that, described pressed liquor is 230 grams per liters containing alkali concn, and half fine concentration is 55 grams per liters.
3. the fine method of extraction regenerated cellulose fibre steeping fluid according to claim 1 half, is characterized in that, concentrated half fibre of described membrane filtration is fine to 65g/l half, sodium hydrate content≤30g/l.
4. the application that regenerated cellulose fibre steeping fluid half is fine, it is characterized in that, the half fine solid that claim 1 is obtained is in H2SO4 and desalination, and the Na2SO4 of removal is for the allotment acid bath of regenerated cellulose fibre production acid bath workshop, and half fine spray-driedly produces for Xylitol.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104311391A (en) * | 2014-11-07 | 2015-01-28 | 宜宾雅泰生物科技有限公司 | Membrane concentration technology for producing xylitol by using viscose fiber pressed liquor as raw materials |
| CN104357589A (en) * | 2014-11-07 | 2015-02-18 | 宜宾雅泰生物科技有限公司 | Membrane filtration process for producing feed-grade xylo-oligosaccharide from viscose fiber squeezed alkali liquor |
| CN105525525A (en) * | 2014-10-24 | 2016-04-27 | 上海凯鑫分离技术有限公司 | Chemical fiber slurry cellulose alkali squeezing liquid treatment and recovery technology |
| CN105601765A (en) * | 2015-12-23 | 2016-05-25 | 中国科学院过程工程研究所 | Device for desalting hemicellulose extract |
| CN106222313A (en) * | 2016-08-26 | 2016-12-14 | 唐山三友集团兴达化纤有限公司 | A kind of method utilizing the waste liquid produced in viscose staple fiber production process to prepare food stage xylose |
| CN107724151A (en) * | 2017-09-30 | 2018-02-23 | 山东福田药业有限公司 | A kind of dissolving pulp alkali immersion liquid handling process |
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| CN103539870A (en) * | 2013-10-28 | 2014-01-29 | 宜宾海丝特纤维有限责任公司 | Method for extracting hemicellulose from plant fiber |
| CN103613688A (en) * | 2013-11-22 | 2014-03-05 | 河北科技大学 | Extraction method and quaternarization modification method for semi-cellulose in waste viscose fiber production liquor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525525A (en) * | 2014-10-24 | 2016-04-27 | 上海凯鑫分离技术有限公司 | Chemical fiber slurry cellulose alkali squeezing liquid treatment and recovery technology |
| CN104311391A (en) * | 2014-11-07 | 2015-01-28 | 宜宾雅泰生物科技有限公司 | Membrane concentration technology for producing xylitol by using viscose fiber pressed liquor as raw materials |
| CN104357589A (en) * | 2014-11-07 | 2015-02-18 | 宜宾雅泰生物科技有限公司 | Membrane filtration process for producing feed-grade xylo-oligosaccharide from viscose fiber squeezed alkali liquor |
| CN104311391B (en) * | 2014-11-07 | 2015-10-28 | 宜宾丝丽雅集团有限公司 | With the membrane concentration technique that viscose fiber pressed liquor is raw material production Xylitol |
| CN105601765A (en) * | 2015-12-23 | 2016-05-25 | 中国科学院过程工程研究所 | Device for desalting hemicellulose extract |
| CN105601765B (en) * | 2015-12-23 | 2017-10-13 | 中国科学院过程工程研究所 | A kind of device for hemicellulose extract desalination |
| CN106222313A (en) * | 2016-08-26 | 2016-12-14 | 唐山三友集团兴达化纤有限公司 | A kind of method utilizing the waste liquid produced in viscose staple fiber production process to prepare food stage xylose |
| CN107724151A (en) * | 2017-09-30 | 2018-02-23 | 山东福田药业有限公司 | A kind of dissolving pulp alkali immersion liquid handling process |
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Application publication date: 20140618 |