CN115821408A - Viscose staple fiber production method capable of reducing carbon disulfide consumption - Google Patents
Viscose staple fiber production method capable of reducing carbon disulfide consumption Download PDFInfo
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- alkali
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- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229920000297 Rayon Polymers 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000007380 fibre production Methods 0.000 title abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 156
- 238000004519 manufacturing process Methods 0.000 claims abstract description 57
- 239000000835 fiber Substances 0.000 claims abstract description 45
- 238000007598 dipping method Methods 0.000 claims abstract description 36
- 238000004383 yellowing Methods 0.000 claims abstract description 34
- 229920002678 cellulose Polymers 0.000 claims abstract description 25
- 239000001913 cellulose Substances 0.000 claims abstract description 25
- 229920002301 cellulose acetate Polymers 0.000 claims abstract description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 4
- 230000002829 reductive effect Effects 0.000 claims description 53
- 238000007086 side reaction Methods 0.000 claims description 41
- 238000005470 impregnation Methods 0.000 claims description 39
- 229920002488 Hemicellulose Polymers 0.000 claims description 33
- 238000009987 spinning Methods 0.000 claims description 31
- 239000002253 acid Substances 0.000 claims description 23
- 238000011084 recovery Methods 0.000 claims description 14
- 238000006477 desulfuration reaction Methods 0.000 claims description 13
- 230000023556 desulfurization Effects 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 13
- 238000011001 backwashing Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 4
- 239000010865 sewage Substances 0.000 abstract description 12
- 239000011550 stock solution Substances 0.000 description 22
- 238000012360 testing method Methods 0.000 description 14
- 239000002585 base Substances 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 13
- 230000027772 skotomorphogenesis Effects 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 239000003292 glue Substances 0.000 description 8
- 239000011734 sodium Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 5
- 238000012549 training Methods 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003009 desulfurizing effect Effects 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 230000005070 ripening Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000003113 alkalizing effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006277 sulfonation reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- -1 viscose Chemical compound 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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Abstract
The invention provides a viscose staple fiber production method for reducing carbon disulfide consumption, which comprises the steps of dipping, squeezing and yellowing, wherein the content of semi-fiber of dipping alkali liquor used in the dipping is 25-30g/l, and CS added in the yellowing 2 The addition amount of the cellulose acetate is 32 plus or minus 0.5 percent of the content of the alkali cellulose methyl fiber. The technical scheme of the invention reduces CS 2 Consumption, reducing the influence on factory environment, sewage treatment and social environment and reducing the production cost.
Description
Technical Field
The invention relates to the field of viscose staple fiber production, in particular to a viscose staple fiber production method for reducing carbon disulfide consumption.
Background
CS 2 Is one of the important raw materials for viscose fiber production, and usually needs to control CS 2 Purity and impurity content of (2), CS is required in production 2 The less dissolved sulfur in the sulfur-containing composition, the better, if CS 2 The content of dissolved sulfur is high, various sulfides are increased in the spinning forming process, acid bath is easy to be polluted, the color of strand silk is easy to yellow, and the hand feeling is rough and hard.
The viscose fiber production process generally comprises the following steps: adding material, alkalizing, vacuumizing, and adding CS 2 Sulfonation, dissolution and feeding. Wherein the production workshop comprises a stock solution vehicleThe system comprises a workshop, an acid station workshop, a spinning workshop, a condensation recovery system and a sewage treatment system.
The consumption of stock solution yellowing CS2 is large, so that the consumption of per ton of silk is high, and meanwhile, production equipment is easy to damage, the maintenance cost is high, and the environment is polluted.
Chinese patent CN 200810157417.3 discloses a process for producing viscose filaments by secondary impregnation, which is based on the traditional process for producing viscose filaments by primary impregnation, adopts a secondary impregnation technology, and utilizes the concentration difference of free alkali in secondary alkali liquor and alkali cellulose to separate out partial free alkali, and simultaneously reduces the semi-fiber content of the alkali cellulose, reduces the occurrence of side reaction in the yellowing process under the condition of not influencing the combined alkali amount, reduces the addition of carbon disulfide, ensures the viscose quality, simultaneously improves the impregnation effect by adding a novel auxiliary agent in the secondary impregnation process, simultaneously selects and selects proper aging, yellowing, ripening and spinning processes, produces high-quality viscose filaments, reduces the production cost, improves the production efficiency, and reduces the environmental pollution. However, the patent belongs to viscose filament yarn production, is completely different from short yarn production process, and is not suitable for the production of short fibers. Meanwhile, the secondary impregnation process needs two sets of squeezer for production, the ton threads are added by equipment and the power consumption of the ton threads is influenced by daily production, the cost is increased, the secondary impregnation is adopted, and the secondary impregnation method is not competitive from the perspective of the profit rate of the current industry, and is completely unsuitable for industrial production.
Chinese patent CN 202210026350.X discloses a recycling method of viscose staple fiber pressed alkali, wherein part of pressed alkali liquid flows back to an impregnation barrel, and is mixed with fresh alkali liquid in the impregnation barrel as impregnation alkali liquid for pulp impregnation; and collecting the residual squeezed alkali liquor to a squeezed liquid barrel, conveying the squeezed alkali liquor in the squeezed liquid barrel to a first filtering system by a first alkali pump, and filtering by the first filtering system, and then conveying the squeezed alkali liquor into a dissolved alkali barrel to be used as dissolved alkali liquor for dissolving and discharging the xanthating machine. By the method, most of the squeezed alkali liquor can be directly recycled to the glue making system, and the nano-filtration or electrodialysis technology is not needed to extract the hemicellulose in the squeezed alkali liquor, so that the manufacturing cost of the viscose is greatly reduced. But the special purpose isThe method utilizes the pressed alkali liquor to prepare the dissolved alkali liquor, and does not consider the hemicellulose content to CS 2 The influence of (c).
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a method for reducing CS of a stock solution workshop 2 A method for producing lost viscose staple fiber.
The invention provides a viscose staple fiber production method for reducing carbon disulfide consumption, which comprises the steps of dipping, squeezing and yellowing, wherein the content of hemicellulose of dipping alkali liquor used in the dipping is 25-30g/l, and CS added in the yellowing 2 The addition amount of the cellulose acetate is 32 plus or minus 0.5 percent of the content of the alkali cellulose methyl fiber.
Preferably: the content of hemicellulose in the alkali cellulose in the impregnation is 2.8-3.1g/l.
Preferably: CS in the yellowing 2 The consumption ratio of the side reaction is less than 25 +/-2%.
Preferably: and (3) preparing the dissolved alkali liquor in the yellowing by the impregnated alkali liquor.
Preferably: the concentration of the impregnated alkali liquor is 220 +/-5 g/l.
Preferably, the following components: and the dissolved alkali liquor is completely impregnated with the impregnated alkali liquor.
Preferably, the following components: the system also comprises a tow filter, and the immersed alkali liquor is used for preparing the backwashing alkali of the tow filter.
Preferably, the following components: the acid discharge time of the tow filter is 2-4 hours.
Preferably: and the method also comprises spinning refining, wherein the spinning refining desulfurization alkali is prepared by the impregnated impregnation alkali liquor.
Preferably: the system also comprises a waste gas recovery system, and waste gas desulfurization alkali is prepared by the impregnated impregnation alkali liquor.
The viscose staple fiber production method for reducing carbon disulfide consumption reduces the CS in the stock solution workshop by reducing the alkali-impregnated semi-fibers in the stock solution workshop 2 Increase the amount of (2) and increase the yellowing of CS 2 To reduce CS in stock solution plants 2 And (4) loss.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for producing viscose staple fibers with reduced carbon disulfide consumption according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
In an embodiment of the invention, a viscose staple fiber production method for reducing carbon disulfide consumption is provided, and comprises the steps of dipping, pressing, yellowing and the like. The half fiber content of the dipping alkali liquor used in the dipping step is 25-30g/l. CS added in the etiolation step 2 The addition amount of the cellulose acetate is 32 plus or minus 0.5 percent of the content of the alkali cellulose methyl fiber.
The embodiment of the invention reduces CS in the viscose production process 2 Consumption technique by controlling stock solution plant CS 2 The consumption of per ton of silk can increase the utilization rate of CS2 and reduce the yellowing of CS in stock solution 2 Loss, reducing the influence on factory environment, sewage treatment and social environment, reducing the production cost,
the production flow of the viscose fiber is generally as follows: adding material, alkalizing, vacuumizing, and adding CS 2 Sulfonation, dissolution and feeding. Wherein the production workshop comprises a stock solution workshop, an acid station workshop, a spinning workshop, a condensation recovery system and a sewage treatment system.
CS reduction in spinning workshop 2 The wear includes methods of:
1. the method reduces the waste silk and waste rubber loss, and comprises the following specific processes and operations:
(1) The spinning process is stabilized, the spinning performance is improved, the process stability is improved by improving the automation level of process control, and the spinning performance is further improved;
(2) The training of spinning bubble discharging operation is enhanced, the glue discharging amount is reduced, and the training is influenced by the proficiency of a spinnerette, has fluctuation, is an uncontrollable factor and needs to be enhanced in management and control;
(3) The spinning operation training is strengthened, the proficiency of spinners is improved, the influence of the proficiency of spinners on the operation waste silk quantity is reduced, fluctuation exists, and the management and control training needs to be strengthened for uncontrollable factors.
2. The method is mainly characterized in that the concentration of carbon disulfide in refining exhaust air is reduced by improving the tightness of a spinning machine, the problem is influenced by the spinning property, the spinning property needs to be improved, the problem of frequent head changing and window opening of the spinning machine is solved, the stability of the process is improved by improving the automation level of process control, and the spinning property is improved.
3. Reduce the environment carbon disulfide concentration of airing exhaust or improve one or several kinds of modes in the condensation rate of recovery, this needs to reduce the operation influence, receives the influence of filature worker proficiency, has undulant, for uncontrollable factor, needs to strengthen the management and control training.
4. CS for improving recovery system of spinning and practicing car 2 The recovery rate is that the adsorption rate of the carbon disulfide is improved by improving the sealing performance of the control valve. With the higher precision of the valve sealing quality, the leakage rate of the sealing valve used at present is already 0.3 multiplied by DNmm of the original B grade 3 Reduced to grade AA 0.0.18 XDNmm 3 The production and use can be met, the production of the process condition is mature, and the quality of environmental protection management and control is greatly facilitated.
5. Reduction of CS in sewage treatment systems 2 Wear, reduction of CS by improving sealing of control valves 2 The loss is avoided, the carbon disulfide escape caused by opening the spinning window for multiple times and changing the head is avoided, and the process production is mature along with the increasing precision of the sealing quality of the valve.
As shown in fig. 1, in an embodiment of the present invention, a production process of a dope shop includes: mixing dregs, feeding, dipping, squeezing, ageing, yellowing, dissolving, filtering, curing, defoaming and spinning.
CS for reducing yellowing in stock solution workshop 2 Consumption, the yellowing CS in the glue making process of a stock solution workshop needs to be reduced 2 The amount of (2) added. But only reduce CS 2 The addition amount of the (B) can correspondingly influence the glue quality.
In the prior art, CS 2 The addition amount of (A) is 35 +/-0.5% of the content of the alpha fibers. The embodiment of the invention can convert CS into 2 Is reduced to 32 + -0.5% to reduce CS 2 And (4) consumption.
The specific principle of yellowing is as follows:
C 6 H 7 O 2 (OH)x-(OH-NaOH)+xCS 2 ＝C 6 H 7 O 2 (OH)x-OCS 2 Na+xH 2 O；
namely, CS 2 Reaction with methylcellulose in alkali cellulose to produce the desired cellulose sulfonate, but with CS 2 And also causes side reactions with hemicellulose and other compounds present in the alkali cellulose, resulting in undesirable impurities.
In general production, the hemicellulose content in the alkali cellulose is generally 3.5 +/-0.5 g/l, and the CS in the same proportion is consumed 2 So only reduce CS 2 The addition of (2) can affect the quality of the glue.
Therefore, the embodiment of the invention correspondingly reduces CS by greatly reducing the hemicellulose content in the alkali cellulose 2 In an amount to increase yellowing of CS 2 The utilization rate of the product, the ripening degree is slowed down, and the quality fluctuation of the finished product is reduced, and the specific theory is that,
C 2 H 6 O 2 +2CS 2 +2NaOH＝H 2 COH-H 2 COH+Na 2 CS 2 +2COS+H 2 O，
COS+4NaOH＝Na 2 CO 3 +Na 2 S+2H 2 O。
the embodiment of the invention proves that the content of the hemicellulose in the dipping alkali and the CS in the yellowing step are obtained through a large number of experiments 2 Table of relationship between side reaction consumption: (test conditions comprise that the amount of the etiolation batch is 9800kg/p, the content of the alpha-cellulose in the alkali fibers is 34 +/-0.5 percent, the content of the alkali is 16 +/-0.5 percent,Etiolated CS 2 The addition amount of 1066.24kg/p, the yellowing initial temperature of 25-27 ℃, the final temperature of 32-33 ℃ and the time of 30-31 min)
Table 1: hemicellulose content and CS 2 Table of relationships between consumption of side reactions
| Impregnation alkali semi-fiber (g/l) | Alkali cellulose semi-fiber (g/l) | CS 2 Consumption by side reaction (kg) | Consumption ratio of side reaction |
| 15 | 2.3 | 208 | 20％ |
| 20 | 2.6 | 235 | 22.5％ |
| 25 | 2.8 | 253 | 24.3％ |
| 30 | 3.1 | 280 | 26.9％ |
| 35 | 3.5 | 317 | 30.5％ |
CS allowing consumption of side reactions in viscose production 2 The proportion is about 25 percent, and the glue making quality is not influenced under the proportion, and the alkali consumption is facilitated. If the content of the hemicellulose is greatly reduced and the side reaction proportion is reduced, the alkali consumption is increased and the compensation is not paid. Therefore, as can be seen from the above table, when the hemicellulose content in the impregnating soda is 25-30g/l, the CS is present 2 The consumption ratio of the side reaction is 26.9-30.5%, the consumption ratio is proper, and the content of the hemicellulose in the dipping alkali is optimal.
Therefore, the embodiment of the invention is known from experimental data that when the half fiber content of the impregnation alkali is controlled below 25g/l, the production quality is favorable, but the alkali consumption is too high due to the large amount of alkali discharge, and the cost is not cost-effective. And above 30g/l, CS 2 The amount of side reactions involved is too great and it is observed from the experimental data that the hemicellulose content is the best at 25-30g/l.
As shown in FIG. 1, in the examples of the present invention, in order to reduce the hemicellulose content in the impregnation base, the hemicellulose content in the impregnation base was controlled to be 25-30g/l. Since the hemicellulose is contained in the impregnation circulating alkali, the embodiment of the invention reduces the influence on CS in the whole production process by consuming the circulating alkali in the impregnation step and using the circulating alkali for the outside 2 Half fiber content consumed.
In an embodiment of the invention, the process of consuming the ring base preferably comprises:
1. the yellowing dissolving base is prepared by using an impregnation base.
The semi-fiber is totally existed in the dipping alkali in the viscose production, and the original alkali, namely concentrated alkali, is used for the preparation of the dissolved alkali in the original production process. After the embodiment of the invention uses the impregnation alkali in the dissolved alkali, part of the impregnation circulating alkali is consumed, and meanwhile, the viscose dissolving quality is not influenced.
The specific principle of the etiolation process is as follows:
C 2 H 6 O 2 +2CS 2 +2NaOH＝H 2 COH-H 2 COH+Na 2 CS 2 +2COS+H2O；
i.e., alkali cellulose with CS 2 The reaction produces cellulose sulfonate solid. The solid cellulose sulfonate is dissolved in dissolved alkali to form required liquid sulfonate, namely viscose, and the liquid sulfonate is used for spinning finished products after being filtered.
The concentration control process of the dissolved alkali is required to be 10-12g/l, the prior art requires to use the original alkali (namely concentrated alkali), and partial impregnation circulating alkali is used in the embodiment of the invention, wherein the concentration of the impregnation alkali is 220 +/-5 g/l, and the temperature is 55 +/-2 ℃.
In addition, in the examples of the present invention, the ratio of the amount of the prepared dissolving lye to the amount of the consumed impregnating lye to the CS was determined by a number of experimental verifications 2 Relationship table of side reaction ratio: (test conditions: amount of etiolation batch 9800kg/p, alkali fiber content of 34 + -0.5%, alkali content of 16 + -0.5%, etiolation CS 2 The addition amount of 1066.24kg/p, the yellowing initial temperature of 25-27 ℃, the final temperature of 32-33 ℃ and the time of 30-31 min):
table 2: proportion of impregnating lye to CS 2 Side reaction ratio relation table
| Using impregnating base ratios | Impregnation alkali semi-fiber (g/l) | Alkali cellulose semi-fiber (g/l) | CS 2 Side reaction ratio (%) |
| 60％ | 42 | 4.5 | 39.2 |
| 70％ | 40.5 | 4.3 | 37.5 |
| 80％ | 39 | 4.1 | 35.7 |
| 90％ | 37.5 | 3.9 | 34.0 |
| 100％ | 36 | 3.8 | 33.1 |
From the above table, it can be seen that after all the dissolving bases were used as the impregnation bases, the hemicellulose and CS in the bases were used for the remaining impregnation cycles 2 The reduction of the consumption of side reactions has a great effect. However, when all the catalyst is used, CS is consumed by side reactions 2 Still accounts for 33.1 +/-0.2%, and the whole problem is not completely solved.
2. Acid station tow filter backwash base the base was impregnated with the stock solution.
The tow filter is used in an acid station for acid bath filtration, where impurities in the acid bath are trapped on the tow after passing through the filter. When the amount of impurities is increased, the acid inlet pressure of the tow filter is gradually increased, so the tow filter needs to be subjected to alkali cleaning when the inlet pressure is increased to 0.4Mpa so as to remove the impurities and reduce the inlet pressure, and the tow is prevented from being broken down and losing efficacy. The main function of the alkali is to neutralize acid in the tow filter so as to avoid the influence of acid water discharge on environmental protection. Here base consumption is a simple acid-base neutralization reaction, namely:
H 2 SO 4 +2NaOH＝Na 2 SO 4 +H2O。
for example, 6 tow filters were cleaned daily at an acid station, with 16m residual sulfuric acid per filter 3 And the concentration is 110g/l, the amount of sulfuric acid to be neutralized per day is as follows:
16m 3 x 6 stations x 1000 x 0.11kg/l =10560kg.
The daily consumption of alkali is as follows:
10560kg×98/80＝12936kg。
the embodiment of the invention uses the dipping circulating alkali, and does not influence the backwashing quality of the tow filter of the acid station. The dipping circulation is that the average alkali concentration of alkali is 210.3 +/-1 g/l, the daily consumption of pressed alkali is as follows:
12936/210.3＝61.5±1m 3 。
through the test of the test example, after partial alkali for the dipping cycle is consumed, the hemicellulose data of the alkali for the dipping cycle can be reduced to 1.5 +/-0.2 g/l, and the hemicellulose content in the alkali cellulose can be reduced to 0.5 +/-0.1 g/l. Accordingly, CS can be lowered 2 4.5. + -. 0.2% was consumed in the side reaction.
3. Alkali for spinning, refining and desulfurizing is changed into stock solution for dipping alkali.
After the production test, the test of the embodiment of the invention does not influence the refining desulfurization quality.
The specific principle of alkali for spinning, refining and desulfurizing is as follows:
NaoH+XS→Na 2 S+XoH。
the sodium sulfide is dissolved in water and discharged to a sewage treatment plant along with sewage, the components which generate reaction and side reaction are too complex, and the alkali liquor supplement adopts continuous supplement to ensure the stable operation of the refiner, so the data of the verification example adopts daily actual consumption, namely, for example, the spinning consumes 12m per day 3 The semi-fiber data in the alkali for dipping circulation can be reduced to 0.3 +/-0.05 g/l, and the semi-fiber data in the alkali for dipping circulation can be reduced to the alkali celluloseThe content of the hemicellulose is 0.1 +/-0.03 g/l. Thereby correspondingly reducing CS 2 0.9. + -. 0.03% is consumed in side reactions.
CAP System (CS) 2 Recovery) desulfurization system stops using concentrated alkali and uses dipping alkali instead. Through the production test of the embodiment of the invention, the desulfurization effect can be satisfied, and CS is not influenced 2 The recovery rate of the waste water is improved,
the desulfurization system has the following specific principle:
NaoH+XS→Na 2 S+XoH。
the sodium sulfide produced is dissolved in water and discharged to a sewage treatment plant along with sewage, and the components of reaction and side reaction are too complex, and the alkali liquor supplement adopts continuous supplement to ensure the stable operation of the desulfurization process, so the daily actual consumption is adopted in the data, namely, for example, the CAP system consumes 85m per day 3 The alkali can be used for dipping, the alkali hemicellulose data in the dipping circulation can be reduced to 2.1 +/-0.05 g/l, and the hemicellulose data in the alkali cellulose can be reduced to 0.7 +/-0.02 g/l. Thereby, CS can be reduced accordingly 2 6.3. + -. 0.05% was consumed in the side reaction.
In summary, the CS can be reduced in total after using 2-4 steps 2 The yellowing side reaction is as follows:
4.5％+0.9％+6.3％＝11.7±0.05％。
after the above 1-4 measures are comprehensively taken, the CS can be reduced 2 The minimum side reaction ratio can reach 33.1 to 11.7 percent (= 21.4 +/-0.05 percent)
According to the theoretical most economical CS in viscose production 2 The consumption of side reaction is about 25%, the above 4 technical measures can completely meet the production regulation and control, the balance is about 3.6%, and the optimal process technology can be adjusted according to the consumption condition of alkali.
In summary, in the embodiments of the present invention, the content of hemicellulose in the residual impregnation circulation alkali can be reduced by consuming impregnation alkali through yellowing dissolution alkali, consuming impregnation alkali through backwashing of the tow filter of the acid station, consuming impregnation alkali through spinning refining desulfurization, consuming impregnation alkali through CAP system desulfurization, and correspondingly reducing CS in the yellowing side reaction 2 The proportion of consumption, lowering CS 2 Loss in the production of stock solution glue.
Meanwhile, the consumption of carbon disulfide consumption in a glue stock solution making workshop is reduced, the escape loss of carbon disulfide in the spinning process of a spinning and refining workshop is reduced, the recovery rate of carbon disulfide of a recovery system is improved, the escape loss of carbon disulfide in a sewage treatment system is reduced, and the CS (carbon disulfide) in the viscose production process is improved 2 Utilization rate, reduced CS 2 Consumption, reducing the influence on factory environment, sewage treatment and social environment and reducing the production cost.
The invention is described below in specific examples:
example 1:
CS reduction in viscose production process 2 A consumable technique comprising the steps of:
stock solution workshop: ( The test conditions are as follows: the amount of the etiolation batch is 9800kg/p, the alkali fiber content of the alkali fiber is 34 +/-0.5 percent, the alkali content is 16 +/-0.5 percent, the addition amount of the etiolation CS2 is 1066.24kg/p, the etiolation initial temperature is 25-27 ℃, the final temperature is 32-33 ℃, and the time is 30-31min )
By reducing CS in the stock solution workshop 2 Compared with the addition amount of the alpha fiber, the consumption of etiolation CS2 is reduced, the ripening degree of the product is slowed down, the quality fluctuation of the finished product is reduced, and the CS of a stock solution workshop is reduced 2 And (4) loss. When the stock solution turns yellow to CS 2 The addition of the relative alpha-fibers is reduced from 35 percent to 34 percent, the per ton of the filaments is reduced by 2.1kg/T filaments, and when the stock solution is yellowed, CS 2 When the addition rate is reduced to 32%, the CS 2 The loss again decreased by 4.2kg/T filament.
By reducing the hemicellulose content in the impregnating alkali, the yellowing CS is reduced 2 Side reaction ratio:
(1) After using the dipping alkali in the dissolving alkali, the dipping alkali hemicellulose and CS 2 The reduction of the consumption of side reactions is of great effect, and after all the use, the side reactions consume CS 2 Can be reduced to the ratio of 33.1%.
(2) The acid station tow filter backwashing alkali is impregnated by using the stock solution, after the alkali is brought into production test, the backwashing quality of the acid station tow filter is not influenced, and the acid station uses 61.5m of alkali daily 3 Soaking alkali, reducing soaking alkali hemicellulose fiber data to 1.5g/l, and reducing hemicellulose fiber content in alkali cellulose by 0.5 g-l, can lower CS 2 4.5% was consumed in the side reaction.
(3) The alkali for spinning, refining and desulfurizing is changed into the alkali for dipping the stock solution, after the alkali is brought into the production test, the test does not influence the refining and desulfurizing quality, and the spinning and refining use 12m daily 3 Dipping alkali, the half fiber data of the dipping alkali is reduced to 0.3g/l, the half fiber content in the alkali cellulose can be reduced to 0.1g/l, and the CS can be reduced 2 0.9% was consumed in the side reaction.
(4) CAP System (CS) 2 Recovery) desulfurization system stops using concentrated alkali, uses dipping alkali instead, and can meet the desulfurization effect without influencing CS (sulfur-containing fuel) through production test 2 Recovery rate, 85m daily for CAP system 3 Dipping alkali, reducing half fiber data of the dipping alkali to 2.1g/l, reducing half fiber data in the alkali cellulose to 0.7g/l, and reducing CS 2 6.3% was consumed in the side reaction.
In total: the CS can be reduced by the four items of 1), 2), 3) and 4) in total 2 The proportion of yellowing side reaction is as follows: 33.1% - (4.5% +0.9% + 6.3%) =21.4%
The technical requirements are met.
Example 2:
the procedure of this example is the same as that of example 1, and since the proportion of the side reaction involved in yellowing has been reduced to 21.4% in example 1, according to the theory of viscose production, the production quality can be controlled as long as the proportion of the side reaction does not exceed 25%, and therefore, the remaining 3.6% of the space can be considered as an alkali-saving project.
From the practical control observation of production, the alkali in the acid station is mainly consumed for neutralizing the waste acid, so that the acid discharge time of the tow filter is prolonged from 2-hour test to 4 hours, and the method can be implemented under the condition of not influencing the production, so that the residual acid content of each tow filter can be 16m 3 Reduced to 12m 3 Namely:
H 2 SO4+ 2 NaOH＝Na 2 SO4+H 2 O
the acid station cleaned 6 tow filters per day, with a residual sulfuric acid content of 12m per filter 3 And the concentration is 110g/l, the amount of sulfuric acid to be neutralized per day is as follows:
12m 3 x 6 stages x 1000 x 0.11kg/l =7920kg.
The daily consumption of alkali is as follows:
7920kg×98/80＝9702kg。
the average alkali concentration of the dipping alkali is 210.3g/l, and the dipping alkali consumed daily is as follows:
9702/210.3＝46.1m 3 。
through test detection, the data of the impregnated alkali hemicellulose is reduced to 1.1g/l, the hemicellulose content in the alkali cellulose can be reduced to 0.37g/l, and the CS can be reduced 2 3.4% is consumed in the side reaction.
Calculating the total yellowing side reaction consumption CS 2 The proportion is 22.5 percent, is in a reasonable range, and realizes the alkaline impregnation of 15.4m per day 3 The sodium carbonate is 3238kg, and the value is 1.2 ten thousand yuan.
Example 3:
this example is the same as example 2, since in example 2, the proportion of yellowing side reaction has been adjusted to 22.5%. According to the viscose production theory, the production quality can be controlled as long as the side reaction proportion is not more than 25%, so that the residual 2.5% of space can be considered as an alkali-saving project.
From the practical control observation of production, the alkali for desulphurization of the spin refiner is 12m per day 3 On the left and right, considering the alkali saving and cost reduction, the use of part of the waste alkali of the recovery part can be replaced by the waste alkali which can save 4m per day 3 The detection proves that the data of reducing the impregnated alkali hemicellulose is 0.2g/l, the hemicellulose content in the alkali cellulose can be reduced by 0.07g/l, and the CS can be reduced 2 0.6% of consumption in side reactions, the total consumption of CS in the yellowing side reactions was calculated 2 The proportion is 22.8%, and is in a reasonable range. And realizing 4m of alkali impregnation per day 3 The converted soda ash is 841kg, and the value is 0.3 ten thousand yuan.
In summary, the embodiment of the invention reduces CS 2 Consumption, reducing the influence on factory environment, sewage treatment and social environment and reducing the production cost.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The production method of the viscose staple fibers capable of reducing carbon disulfide consumption is characterized by comprising the steps of dipping, squeezing and yellowing, wherein the content of hemicellulose in dipping alkali liquor used in the dipping is 25-30g/l, and CS added in the yellowing 2 The addition amount of the cellulose acetate is 32 plus or minus 0.5 percent of the content of the alkali cellulose methyl fiber.
2. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 1, wherein: the content of hemicellulose in the alkali cellulose in the impregnation is 2.8-3.1g/l.
3. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 1, wherein: CS in the yellowing 2 The consumption ratio of the side reaction is less than 25 +/-2%.
4. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 1, wherein: and (3) preparing the dissolved alkali liquor in the yellowing by the impregnated alkali liquor.
5. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 4, wherein: the concentration of the impregnated alkali liquor is 220 +/-5 g/l.
6. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 4, wherein: and the dissolved alkali liquor is completely impregnated with the impregnated alkali liquor.
7. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 1, wherein: the system also comprises a tow filter, and the immersed alkali liquor is used for preparing the backwashing alkali of the tow filter.
8. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 7, wherein: the acid discharge time of the tow filter is 2-4 hours.
9. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 1, wherein: and the method also comprises spinning refining, wherein the spinning refining desulfurization alkali is prepared by the impregnated impregnation alkali liquor.
10. The method for producing viscose staple fiber with reduced carbon disulfide consumption according to claim 1, wherein: the system also comprises a waste gas recovery system, and waste gas desulfurization alkali is prepared by the impregnated impregnation alkali liquor.
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