CN109320744A - A kind of regenerated cellulose film bleaching process - Google Patents
A kind of regenerated cellulose film bleaching process Download PDFInfo
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- CN109320744A CN109320744A CN201811126267.XA CN201811126267A CN109320744A CN 109320744 A CN109320744 A CN 109320744A CN 201811126267 A CN201811126267 A CN 201811126267A CN 109320744 A CN109320744 A CN 109320744A
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- regenerated cellulose
- cellulose film
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- desulfurization
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
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- Polymers & Plastics (AREA)
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- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention discloses a kind of regenerated cellulose film bleaching process, belong to regenerated cellulose film production technical field, comprising steps of washing after desulfurization, desulfurization, washing and dechlorination after washing, bleaching, drift before drift.Desulfurization process first is carried out to regenerated cellulose film before bleaching, sulphur simple substance inside regenerated cellulose film then needs to remove by desulfurizing agent sodium hydroxide solution, using ClO 2 solution as bleaching agent, bleaching effect is good, the required bleaching effect of regenerated cellulose film production can be reached in low-temp low-pressure and in the extremely short time, the oxidizing potential of chlorine dioxide is lower than the oxidizing potential of cellulose, it bleaches smaller for the damage of regenerated cellulose membrane fiber, by temperature, the influence of pH is smaller, and the organic chloride that ClO 2 bleaching generates is less, furthermore, it arranges in pairs or groups dechlorination process after new bleaching, effectively, regenerated cellulose film and the residual chlorinity of waste water are reduced environmentally friendlyly.
Description
Technical field
The present invention relates to regenerated cellulose film production technical fields, and in particular to a kind of regenerated cellulose film bleaching process.
Background technique
The molding production process of regenerated cellulose film is generally solidification-regeneration-washing-desulfurization-washing-bleaching-washing-modeling
Change, the purpose of bleaching mainly improves the coloration and transparency of regenerated cellulose film, while part that can be removed impurity.At present
The main bleaching agent of regenerated cellulose film molding production is the liquor natrii hypochloritis with strong oxidizing property, mainly logical by chlorine
Enter sodium hydroxide solution and be made, liquor natrii hypochloritis has stronger bleaching power, but liquor natrii hypochloritis's preparation efficiency
It is lower, and property is more unstable, is affected by temperature, pH, bleaching effect is more difficult to control, and low concentration is not easy to reach bleaching effect
Fruit, high concentration easily make fibre damage again, influence the film strength of regenerated cellulose film.In addition, as country and enterprise are for drift
The attention of white contaminated wastewater, the especially control to organohalogen compounds discharge, the use of traditional bleaching agent sodium hypochlorite will be by
To increasing limitation.
Summary of the invention
For above-mentioned technical problem, the present invention provides a kind of regenerated cellulose film bleaching process, and regenerated cellulose can be improved
The bleaching effect of film does not influence regenerated cellulose film film strength, while dechlorination process after new bleaching of arranging in pairs or groups, and can reduce again
Raw cellulose membrane and the residual chlorinity of waste water, moreover it is possible to avoid traditional dechlorination process increased anionic trash in waste water.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of regenerated cellulose film bleaching process, comprising steps of before washing, floating after desulfurization, desulfurization after washing, bleaching, drift
Washing and dechlorination.
A kind of regenerated cellulose film bleaching process, specifically includes the following steps:
(1) desulfurization: regenerated cellulose film, which enters in the desulfurizer containing desulfurizing agent, carries out desulfurization process；
(2) washed after desulfurization: regenerated cellulose film from desulfurizer enter the desulfurization containing water after rinsing bowl carry out washing place
Reason；
(3) washing before drift: rinsing bowl carries out again before regenerated cellulose film rinsing bowl after desulfurization enters the drift containing water
Washing process；
(4) bleach: after above-mentioned washing, regenerated cellulose film, which enters in the bleaching cistern containing bleaching liquid, to be carried out at bleaching
Reason；
(5) wash after floating: after above-mentioned bleaching, rinsing bowl is washed after regenerated cellulose film enters the drift containing water；
(6) dechlorination: after above-mentioned washing, regenerated cellulose film, which enters in the dechlorination slot containing antichlor, to be carried out at dechlorination
Reason.
Preferably, the desulfurizing agent in the step (1) is the sodium hydroxide solution of 0.5-3g/L, solution temperature 80-90
℃。
Preferably, the water temperature of rinsing bowl is 50-60 DEG C after desulfurization in the step (2).
Preferably, the step (3) and the water temperature of rinsing bowl after rinsing bowl before drift in step (5) and drift are 35-45 DEG C.
Preferably, the bleaching liquid in the step (4) is ClO 2 solution.
Preferably, the concentration of the ClO 2 solution is 0.5-1g/L, and solution temperature is 35-45 DEG C, pH value of solution 8-
10。
Preferably, the antichlor in the step (6) is hydrogenperoxide steam generator.
Preferably, the concentration of the hydrogenperoxide steam generator is 0.4-0.6g/L.
Preferably, it is equipped with automatic steam heating device in rinsing bowl after the desulfurizer and desulfurization, for directly heating.
Beneficial effects of the present invention are shown:
(1) present invention first carries out desulfurization process to regenerated cellulose film before bleaching, this is because regenerated cellulose film is again
After life, the sulphur simple substance for being attached to regenerated cellulose film surface can be removed after hot water washs, and inside regenerated cellulose film
Sulphur simple substance then needs to remove by desulfurizing agent sodium hydroxide solution, in addition, regenerated cellulose membrane fiber in order to prevent is excessive swollen
Profit, causes wet strength to reduce, sulfur removal technology is by the way of high temperature low alkali liquid concentration, and regenerated cellulose film will not go out after desulfurization
The problem of existing peculiar smell and paper turn to be yellow；
(2) using ClO 2 solution as bleaching agent, bleaching effect is good, can be in low-temperature atmosphere-pressure and in the extremely short time
Reach the required bleaching effect of regenerated cellulose film production, in addition, the oxidizing potential of chlorine dioxide is lower than the oxidation of cellulose
Current potential, bleach it is smaller for the damage of regenerated cellulose membrane fiber, influenced by temperature, pH it is smaller, and ClO 2 bleaching produce
Raw organic chloride is lower；
(3) using hydrogenperoxide steam generator as antichlor after drift, after capable of effectively, environmentally friendlyly removing regenerated cellulose film and drift
Residual chlorine in water, stablizes the product quality of regenerated cellulose film after bleaching, and it is useless not will increase bleaching after hydrogenperoxide steam generator reaction
Anionic trash in water reduces the residual chlorinity and processing difficulty of bleaching effluent.
Detailed description of the invention
Fig. 1 is a kind of overall flow schematic diagram of regenerated cellulose film bleaching process of the present invention；
Fig. 2 is the overall structure diagram of bleaching cistern in Fig. 1.
Specific embodiment
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings:
As shown in Figure 1, a kind of regenerated cellulose film bleaching process, comprising steps of washed before washing, floating after desulfurization, desulfurization,
Washing and dechlorination after bleaching, drift.Specifically includes the following steps:
(1) desulfurization: regenerated cellulose film, which enters in the desulfurizer containing desulfurizing agent, carries out desulfurization process；
(2) washed after desulfurization: regenerated cellulose film from desulfurizer enter the desulfurization containing water after rinsing bowl carry out washing place
Reason；
(3) washing before drift: rinsing bowl carries out again before regenerated cellulose film rinsing bowl after desulfurization enters the drift containing water
Washing process；
(4) bleach: after above-mentioned washing, regenerated cellulose film, which enters in the bleaching cistern containing bleaching liquid, to be carried out at bleaching
Reason；
(5) wash after floating: after above-mentioned bleaching, rinsing bowl is washed after regenerated cellulose film enters the drift containing water；
(6) dechlorination: after above-mentioned washing, regenerated cellulose film, which enters in the dechlorination slot containing antichlor, to be carried out at dechlorination
Reason.
The sodium hydroxide solution that desulfurizing agent in the step (1) is 0.5-3g/L, solution temperature are 80-90 DEG C.It is described
The water temperature of rinsing bowl is 50-60 DEG C after desulfurization in step (2).Water after floating preceding rinsing bowl in the step (3) and step (5) and floating
The water temperature of washing trough is 35-45 DEG C.Bleaching liquid in the step (4) is ClO 2 solution.The ClO 2 solution
Concentration is 0.5-1g/L, and solution temperature is 35-45 DEG C, pH value of solution 8-10.Antichlor in the step (6) is hydrogen peroxide
Solution.The concentration of the hydrogenperoxide steam generator is 0.4-0.6g/L.It is equipped in rinsing bowl after the desulfurizer and desulfurization automatic
Steam heater, for directly heating.
As shown in Fig. 2, desulfurizer, rinsing bowl, dechlorination after rinsing bowl, drift before rinsing bowl, drift after desulfurization that the present invention uses
Slot is as the structure of bleaching cistern, specification, and regenerated cellulose film moves under the action of being driven floating axle with transmission lower shaft, Ge Gegong
Skill step either water or medical fluid be on one side into while go out, keep in each slot that liquid level is constant, regenerated cellulose film exists
Residence time (reaction time) in each slot is related with the vehicle speed of service.
Specific embodiment 1:
A kind of regenerated cellulose film bleaching process, specifically includes the following steps:
(1) desulfurization: regenerated cellulose film, which enters in the desulfurizer containing 1g/L sodium hydroxide solution, carries out desulfurization process, molten
Liquid temperature is 85 DEG C, according to fixed vehicle speed, stop reaction time of the regenerated cellulose film in desulfurizer in sodium hydroxide solution
For 8s；
(2) washed after desulfurization: regenerated cellulose film from desulfurizer enter desulfurization after rinsing bowl carry out washing process, water temperature 55
DEG C, equally, washing time of the regenerated cellulose film after desulfurization in rinsing bowl is 8s；
(3) washing before drift: rinsing bowl carries out floating preceding washing process before regenerated cellulose film rinsing bowl after desulfurization enters drift,
Water temperature is 38 DEG C, and equally, washing time of the regenerated cellulose film before drift in rinsing bowl is 8s；
(4) bleach: after above-mentioned washing, regenerated cellulose film carries out in the bleaching cistern containing 1g/L ClO 2 solution
Bleaching, 9 ± 0.5, temperature is controlled at 35 DEG C for pH value of solution control, equally, bleaching of the regenerated cellulose film in bleaching cistern
Time is 8s；
(5) float after wash: regenerated cellulose film after above-mentioned bleaching, into drift after rinsing bowl floated after wash, water
Temperature is 36 DEG C, and equally, washing time of the regenerated cellulose film after drift in rinsing bowl is 8s；
(6) dechlorination: after above-mentioned washing, regenerated cellulose film enters in the dechlorination slot containing 0.5g/L hydrogenperoxide steam generator
Dechlorination processing is carried out, equally, dechlorination time of the regenerated cellulose film in dechlorination slot is 8s.
After the processing of above-mentioned bleaching process, obtained regenerated cellulose film transparency is good, and paper becomes clear lighter color, table
Face impurity significantly reduces, better than the regenerated cellulose film of current traditional bleaching process production.
Specific embodiment 2:
A kind of regenerated cellulose film bleaching process, specifically includes the following steps:
(1) desulfurization: regenerated cellulose film, which enters in the desulfurizer containing 0.8g/L sodium hydroxide solution, carries out desulfurization process,
Solution temperature is 80 DEG C, according to fixed vehicle speed, when stop of the regenerated cellulose film in desulfurizer in sodium hydroxide solution is reacted
Between be 7s；
(2) washed after desulfurization: regenerated cellulose film from desulfurizer enter desulfurization after rinsing bowl carry out washing process, water temperature 52
DEG C, equally, washing time of the regenerated cellulose film after desulfurization in rinsing bowl is 7s；
(3) washing before drift: rinsing bowl carries out washing process, water temperature before regenerated cellulose film rinsing bowl after desulfurization enters drift
It is 35 DEG C, equally, washing time of the regenerated cellulose film before drift in rinsing bowl is 7s；
(4) bleach: after above-mentioned washing, regenerated cellulose film in the bleaching cistern containing 0.8g/L ClO 2 solution into
Row bleaching, 9 ± 0.5, temperature is controlled at 35 DEG C for pH value of solution control, equally, drift of the regenerated cellulose film in bleaching cistern
The white time is 7s；
(5) float after wash: regenerated cellulose film after above-mentioned bleaching, into drift after rinsing bowl washed, water temperature is
35 DEG C, equally, washing time of the regenerated cellulose film after drift in rinsing bowl is 7s；
(6) dechlorination: after above-mentioned washing, regenerated cellulose film enters in the dechlorination slot containing 0.4g/L hydrogenperoxide steam generator
Dechlorination processing is carried out, dechlorination time of the regenerated cellulose film in dechlorination slot is 7s.
After the processing of above-mentioned bleaching process, obtained regenerated cellulose film transparency is good, and paper becomes clear lighter color, table
Face impurity significantly reduces, and bleaching effect is equal to the regenerated cellulose film of traditional bleaching process production at present.
Above content is only to structure example of the invention and explanation, affiliated those skilled in the art
It makes various modifications or additions to the described embodiments or is substituted in a similar manner, without departing from invention
Structure or beyond the scope defined by this claim, be within the scope of protection of the invention.
Claims (10)
1. a kind of regenerated cellulose film bleaching process, which is characterized in that comprising steps of washed before washing, floating after desulfurization, desulfurization,
Washing and dechlorination after bleaching, drift.
2. a kind of regenerated cellulose film bleaching process according to claim 1, which is characterized in that specifically include following step
It is rapid:
(1) desulfurization: regenerated cellulose film, which enters in the desulfurizer containing desulfurizing agent, carries out desulfurization process；
(2) washed after desulfurization: regenerated cellulose film from desulfurizer enter the desulfurization containing water after rinsing bowl carry out washing process；
(3) washing before drift: regenerated cellulose film rinsing bowl after desulfurization is washed again into rinsing bowl before the drift containing water
Processing；
(4) bleach: after above-mentioned washing, regenerated cellulose film, which enters in the bleaching cistern containing bleaching liquid, carries out bleaching；
(5) wash after floating: after above-mentioned bleaching, rinsing bowl is washed after regenerated cellulose film enters the drift containing water；
(6) dechlorination: after above-mentioned washing, regenerated cellulose film, which enters, carries out dechlorination processing in the dechlorination slot containing antichlor.
3. a kind of regenerated cellulose film bleaching process according to claim 2, which is characterized in that in the step (1)
Desulfurizing agent is the sodium hydroxide solution of 0.5-3g/L, and solution temperature is 80-90 DEG C.
4. a kind of regenerated cellulose film bleaching process according to claim 2, which is characterized in that taken off in the step (2)
The water temperature of rinsing bowl is 50-60 DEG C after sulphur.
5. a kind of regenerated cellulose film bleaching process according to claim 2, which is characterized in that the step (3) and step
Suddenly the water temperature of rinsing bowl and rinsing bowl after drift is 35-45 DEG C before floating in (5).
6. a kind of regenerated cellulose film bleaching process according to claim 2, which is characterized in that in the step (4)
Bleaching liquid is ClO 2 solution.
7. a kind of regenerated cellulose film bleaching process according to claim 6, which is characterized in that the ClO 2 solution
Concentration be 0.5-1g/L, solution temperature be 35-45 DEG C, pH value of solution 8-10.
8. a kind of regenerated cellulose film bleaching process according to claim 2, which is characterized in that in the step (6)
Antichlor is hydrogenperoxide steam generator.
9. a kind of regenerated cellulose film bleaching process according to claim 8, which is characterized in that the hydrogenperoxide steam generator
Concentration be 0.4-0.6g/L.
10. a kind of regenerated cellulose film bleaching process according to claim 2, which is characterized in that the desulfurizer and de-
Automatic steam heating device is equipped with after sulphur in rinsing bowl.
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| CN201811126267.XA CN109320744B (en) | 2018-09-26 | 2018-09-26 | Regenerated cellulose membrane bleaching process |
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| CN201811126267.XA CN109320744B (en) | 2018-09-26 | 2018-09-26 | Regenerated cellulose membrane bleaching process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0512978A1 (en) * | 1991-05-02 | 1992-11-11 | VOEST-ALPINE Industrieanlagenbau GmbH | Process for bleaching xylan and lignocellulose containing materials |
| US20100086499A1 (en) * | 2006-05-09 | 2010-04-08 | Gary Robert Burnett | Tooth whitening composition |
| CN104278507A (en) * | 2013-07-09 | 2015-01-14 | 无锡市兴麟染整环保有限公司 | Purifying bleaching clean production technology for fabric |
| CN106435799A (en) * | 2016-08-29 | 2017-02-22 | 山东银鹰化纤有限公司 | Preparing method of high-strength regenerated cellulose fiber |
-
2018
- 2018-09-26 CN CN201811126267.XA patent/CN109320744B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0512978A1 (en) * | 1991-05-02 | 1992-11-11 | VOEST-ALPINE Industrieanlagenbau GmbH | Process for bleaching xylan and lignocellulose containing materials |
| US20100086499A1 (en) * | 2006-05-09 | 2010-04-08 | Gary Robert Burnett | Tooth whitening composition |
| CN104278507A (en) * | 2013-07-09 | 2015-01-14 | 无锡市兴麟染整环保有限公司 | Purifying bleaching clean production technology for fabric |
| CN106435799A (en) * | 2016-08-29 | 2017-02-22 | 山东银鹰化纤有限公司 | Preparing method of high-strength regenerated cellulose fiber |
Non-Patent Citations (2)
| Title |
|---|
| 林启铨等: "《纸浆造纸工程》", 30 November 1989, 轻工业出版社 * |
| 江体乾: "《化工工艺手册》", 29 February 1992, 上海科学技术出版社 * |
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