CN205442665U - Purification recovery of sodium sulfocyanate aqueous solution in production of two step method acrylic fibres - Google Patents
Purification recovery of sodium sulfocyanate aqueous solution in production of two step method acrylic fibres Download PDFInfo
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- CN205442665U CN205442665U CN201620231336.3U CN201620231336U CN205442665U CN 205442665 U CN205442665 U CN 205442665U CN 201620231336 U CN201620231336 U CN 201620231336U CN 205442665 U CN205442665 U CN 205442665U
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- 238000000034 method Methods 0.000 title claims abstract description 63
- VGTPCRGMBIAPIM-UHFFFAOYSA-M sodium thiocyanate Chemical compound [Na+].[S-]C#N VGTPCRGMBIAPIM-UHFFFAOYSA-M 0.000 title claims abstract description 59
- 238000011084 recovery Methods 0.000 title claims abstract description 14
- 238000000746 purification Methods 0.000 title claims abstract description 13
- 229920002972 Acrylic fiber Polymers 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 239000007864 aqueous solution Substances 0.000 title abstract 2
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 39
- 238000012432 intermediate storage Methods 0.000 claims abstract description 35
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 10
- 230000002000 scavenging effect Effects 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 239000000835 fiber Substances 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 25
- 238000007380 fibre production Methods 0.000 claims description 9
- 239000012141 concentrate Substances 0.000 claims description 7
- 239000006200 vaporizer Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 abstract description 81
- 239000012535 impurity Substances 0.000 abstract description 22
- 239000012528 membrane Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 239000012510 hollow fiber Substances 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 238000010790 dilution Methods 0.000 description 12
- 239000012895 dilution Substances 0.000 description 12
- 238000001914 filtration Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 235000011121 sodium hydroxide Nutrition 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000010923 batch production Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000005183 dynamical system Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 235000014666 liquid concentrate Nutrition 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 239000001117 sulphuric acid Substances 0.000 description 4
- 235000011149 sulphuric acid Nutrition 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 210000004534 cecum Anatomy 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 235000008504 concentrate Nutrition 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- -1 iron ion Chemical class 0.000 description 2
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 1
- 206010023126 Jaundice Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a purification recovery of sodium sulfocyanate aqueous solution in production of two step method acrylic fibres, including first holding tank, a bag filter, hollow fiber ultrafiltration device, intermediate storage tanks, the 2nd bag filter, the book formula membrane device that feeds through in proper order, warp dope after the formula of book membrane device is handled is retrieved extremely intermediate storage tanks, scavenging solution send into the second holding tank and treat the evaporation, just be equipped with a plate heat exchanger on the pipeline between book formula membrane device and the second storage jar, evaporated liquor in the second holding tank after the evaporation gets into the third holding tank, sodium sulfocyanate solution flow in the third holding tank is concentrated to the evaporimeter. The utility model discloses simple structure, easy operation utilizes the hollow fiber milipore filter as first impurity removal treatment technique, adopts the stage treatment theory can not only stabilize the effect of edulcoration, also can improve the stability of this technique in the actual motion greatly.
Description
Technical field
This utility model relate to a kind of can not sewer process and solvent recycle device, the purification recovery device of sodium thiocyanate water solution in a kind of two step method acrylic fiber production process.
Background technology
Most two step method acrylic fiber production process process is to use sodium thiocyanate solution to cool down solvent as polymerization solvent and molten silk, has the impurity such as sulfate ion, iron ion, P-SPN, P-SPA and enter in sodium thiocyanate solution in production link.Sodium thiocyanate solution is to recycle during acrylic fiber production process, and the accumulation of impurity can cause many harmful effects, therefore has special solution purification remanufacture process to make a return journey the removal of impurity.
Having multiple method at present for purification of sodium thiocyanate solution via, preliminary purifying generally uses sodium hydroxide pellets method to combine kieselguhr filtration or ion exchange to the impurity iron ion removing in solution；Two steps process the method generally using evaporation and concentration and Crystallization Separation；Three step process uses delay ion exchange to remove other some impurity, postpones ion-exchange resins and uses sulphuric acid and sodium hydroxide to regenerate, the most also has the simple membrane process craft using nanofiltration membrane,
The shortcoming of these techniques: operation is many, control is complicated, industrial chemicals consumption greatly outside, also produce a large amount of useless solid and waste water, the consumption such as sulphuric acid used, sodium hydroxide, diisopropyl ether is big, and cost is high, dangerous big, and environmental pollution is serious.And dust removal rate is low, make the quality of NaSCN solvent occur deteriorating, reflect that the jaundice of original liquid coloring, fiber and production stability decline.
The response rate of traditional sodium thiocyanate solution method for purifying and recovering is typically only capable to reach 90%, high energy consumption and the consumption of chemical agent (kieselguhr, sulphuric acid, sodium hydroxide) due to evaporating, concentrating and crystallizing, not only energy and material consumption cost is high, and produce substantial amounts of waste water, useless solid, and occur due to side reaction and the impurity brought into chemical agent also can affect the quality of sodium thiocyanate solution.
Utility model content
The purpose of this utility model is to provide a kind of high-recovery, low cost, high-quality, and can the purification recovery device of sodium thiocyanate water solution in the two step method acrylic fiber production process of more stable operation, to solve the problem that prior art exists.
For achieving the above object, this utility model is achieved by the following technical programs:
The purification recovery device of sodium thiocyanate water solution in a kind of two step method acrylic fiber production process of the present utility model, including the first holding tank being sequentially communicated, first bag filter, hollow-fibre ultrafiltration device, intermediate storage tank, second bag filter, rolled film device, dope after described rolled film device processes is recycled to described intermediate storage tank, it is to be evaporated that scavenging solution sends into the second holding tank, and the pipeline between described rolled film device and the second storage tank is provided with a plate type heat exchanger, in described second holding tank, the evaporation liquid after evaporation enters the 3rd holding tank, sodium thiocyanate solution in described 3rd holding tank flow to vaporizer and concentrates.
The device of method for purifying and recovering described in the utility model, described 3rd holding tank connects with described intermediate storage tank.
The device of method for purifying and recovering described in the utility model, described hollow-fibre ultrafiltration device is provided with electromagnetic flowmeter.
Beneficial effect
This utility model compared with prior art, has the advantage that
This utility model apparatus structure is simple, easily operation, after using device Recovery Purifying of the present utility model, during in waste liquid, the quality of sodium rhodanate accounts for former feedstock solution, the gross mass of sodium rhodanate is less than 1%, reclaim sodium rhodanate and can reach more than 99%, production process need not add the chemical raw materials such as Caustic soda, sulphuric acid, kieselguhr, flush distillation concentration process is reduced than common conventional purge recovery method, desalted water consumption reduces more than 80%, the evaporation and concentration water yield also greatly reduces, and quantity of wastewater effluent also greatly reduces.Simultaneously, compare simple employing NF membrane impurity removing technology, this utility model utilizes hollow fiber ultrafiltration membrane as first remove impurity treatment technology, uses staged care theory can not only stablize the effect of remove impurity, also can be greatly improved this technology stability in actual motion.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the purification recovery device of sodium thiocyanate water solution in this utility model two step method acrylic fiber production process
Detailed description of the invention
Below in conjunction with detailed description of the invention, this utility model is expanded on further.Should be understood that these embodiments are merely to illustrate this utility model rather than limit scope of the present utility model.In addition, it is to be understood that after having read the content that this utility model is lectured, this utility model can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
As shown in Figure 1, the purification recovery device of sodium thiocyanate water solution in two step method acrylic fiber production process of the present utility model, including the first holding tank 1 being sequentially communicated, first bag filter 2, hollow-fibre ultrafiltration device 3, intermediate storage tank 4, second bag filter 5, rolled film device 7, dope after rolled film device 7 processes is recycled to intermediate storage tank 4, it is to be evaporated that scavenging solution sends into the second holding tank 8, and the pipeline between rolled film device 7 and the second storage tank 8 is provided with a plate type heat exchanger 6, in second holding tank 8, the evaporation liquid after evaporation enters the 3rd holding tank 10, sodium thiocyanate solution in 3rd holding tank flow to vaporizer and concentrates.3rd holding tank 10 connects with intermediate storage tank 4.
Embodiment 1
Step one:
The height that the production processes such as spinning produce is containing miscellaneous sodium thiocyanate solution A (control sodium rhodanate concentration and account for solution weight percent concentration 17%), and temperature controls at 15 DEG C, enters buffering the first holding tank 1 afterwards, excludes the oily substance in solution；The impurity such as the insoluble solid suspension during hereafter the first bag filter 2 through precision 100 microns filters interception solution；
Step 2:
Hollow-fibre ultrafiltration device 3 by the modified PVDF material of 50,000 molecular weight, the sodium thiocyanate solution leaching impurity after removing overwhelming majority oligomer is collected to intermediate storage tank 4, hollow-fibre ultrafiltration device uses cross-flow circulation and the full filter type of final cecum (cross flow filter: feed liquid is parallel to face flowing under the promotion of pump, the shearing force that feed liquid unlike filtering from cecum produces when flowing through face takes away the granule being detained on face, so that pollution layer is maintained at a relatively thin level), during cross-flow circulation, dope is back to the first holding tank 1.Hollow-fibre ultrafiltration device 3 filter liquor is measured by electromagnetic flowmeter batch, and when every batch filter liquor reaches setting value, ultrafiltration apparatus is out of service, treats that next batch processes after safeguarding；
Step 3:
Filtering accuracy is to start after 150 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filter liquor to run simultaneously with hollow-fibre ultrafiltration device 3 device, prevent system pipeline and dynamical system from having impurity to enter rolling system, the second bag filter 5 that a precision is 25 microns is set before rolled film device 7.Dope is back to intermediate storage tank 4, by the constant temperature of intermediate storage tank 4 that is back to of plate type heat exchanger 6 at 25 DEG C.It is to be evaporated that scavenging solution after rolled film device 7 process sends into the second holding tank 8.Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the setting value that hollow-fibre ultrafiltration device 3 processes, and when after rolled film device 7 processes, qualified sodium thiocyanate solution reaches enter the first holding tank 1 feed liquid 90%.The desalted water B and the front batch that start surplus solution volume in 5 times of intermediate storage tanks of injection in intermediate storage tank 4 are injected rolled film device 7 after dilution water is dialysed and are collected in the 3rd holding tank 10 permeate of part.Desalted water add rear rolled film device 7 continue to concentrate, now rolled film device 7 purify after solution continue to be fed into the second holding tank 8 to be evaporated until go out liquid amass reach add dilution desalted water 1/2.The liquid that goes out of device 7 sends into the 3rd holding tank 10 afterwards, and the dilution water and the desalted water B that process as rolled film device 7 next batch are used in mixed way.
In intermediate storage tank 4 concentrated solution discharge as waste liquid concentrate separately, burning disposal or collect focuses on to sewage plant C is unified, the sodium rhodanate total amount wherein lost is in feedstock solution B the 0.9% of sodium rhodanate total amount.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8, through the concentration of quintuple effect evaporator 9, controls feed flow rate and becomes the sodium thiocyanate solution D of 52% concentration and condense water E, use other production link.After process above processes, reclaim sodium rhodanate and can reach 99.2%.
Embodiment 2
Step one:
The height that the production processes such as spinning produce is containing miscellaneous sodium thiocyanate solution A (control sodium rhodanate concentration and account for solution weight percent concentration 16%), and temperature controls at 45 DEG C, enters buffering the first holding tank 1 afterwards, excludes the oily substance in solution；The impurity such as the insoluble solid suspension during hereafter the first bag filter 2 through precision 100 microns filters interception solution；
Step 2:
Hollow-fibre ultrafiltration device 3 by the modified PVDF material of 100,000 molecular weight, the sodium thiocyanate solution leaching impurity after removing overwhelming majority oligomer is collected to intermediate storage tank 4, hollow-fibre ultrafiltration device uses cross-flow circulation and the blindest section of full filter type (cross flow filter: feed liquid is parallel to face flowing under the promotion of pump, the shearing force produced when feed liquid unlike dead-end filtration flows through face takes away the granule being detained on face, so that pollution layer is maintained at a relatively thin level), during cross-flow circulation, dope is back to the first holding tank 1.Hollow-fibre ultrafiltration device 3 filter liquor is measured by electromagnetic flowmeter batch, and when every batch filter liquor reaches setting value, ultrafiltration apparatus is out of service, treats that next batch processes after safeguarding；
Step 3:
Filtering accuracy is to start after 500 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filter liquor to run simultaneously with hollow-fibre ultrafiltration device 3 device, prevent system pipeline and dynamical system from having impurity to enter rolling system, the second bag filter 5 that a precision is 25 microns is set before rolled film device 7.Dope is back to intermediate storage tank 4, by the constant temperature of intermediate storage tank 4 that is back to of plate type heat exchanger 6 at 25 DEG C.It is to be evaporated that scavenging solution after rolled film device 7 process sends into the second holding tank 8.Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the setting value that hollow-fibre ultrafiltration device 3 processes, and when after rolled film device 7 processes, qualified sodium thiocyanate solution reaches enter the first holding tank 1 feed liquid 92%.The desalted water B and the front batch that start surplus solution volume in 4 times of intermediate storage tanks 4 of injection in intermediate storage tank 4 are injected rolled film device 7 after dilution water is dialysed and are collected in the 3rd holding tank 10 permeate of part.Desalted water add rear rolled film device 7 continue to concentrate, now rolled film device 7 purify after solution continue to be fed into the second holding tank 8 to be evaporated until go out liquid amass reach add dilution desalted water 1/20.The liquid that goes out of device 7 sends into the 3rd holding tank 10 afterwards, and the dilution water and the desalted water B that process as rolled film device 7 next batch are used in mixed way.
In intermediate storage tank 4 concentrated solution discharge as waste liquid concentrate separately, burning disposal or collect focuses on to sewage plant C is unified, the sodium rhodanate total amount wherein lost is in feedstock solution B the 0.85% of sodium rhodanate total amount.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8, through the concentration of quintuple effect evaporator 9, controls feed flow rate and becomes the sodium thiocyanate solution D of 50% concentration and condense water E, use other production link.After process above processes, reclaim sodium rhodanate and can reach 99.6%.
Embodiment 3
Step one:
The height that the production processes such as spinning produce is containing miscellaneous sodium thiocyanate solution A (control sodium rhodanate concentration and account for solution weight percent concentration 15%), and temperature controls at 25 DEG C, enters buffering the first holding tank 1 afterwards, excludes the oily substance in solution；The impurity such as the insoluble solid suspension during hereafter the first bag filter 2 through precision 100 microns filters interception solution；
Step 2:
Hollow-fibre ultrafiltration device 3 by the modified PVDF material of 80,000 molecular weight, the sodium thiocyanate solution leaching impurity after removing overwhelming majority oligomer is collected to intermediate storage tank 4, hollow-fibre ultrafiltration device uses cross-flow circulation and the blindest section of full filter type (cross flow filter: feed liquid is parallel to face flowing under the promotion of pump, the shearing force produced when feed liquid unlike dead-end filtration flows through face takes away the granule being detained on face, so that pollution layer is maintained at a relatively thin level), during cross-flow circulation, dope is back to the first holding tank 1.Hollow-fibre ultrafiltration device 3 filter liquor is measured by electromagnetic flowmeter batch, and when every batch filter liquor reaches setting value, ultrafiltration apparatus is out of service, treats that next batch processes after safeguarding；
Step 3:
Filtering accuracy is to start after 450 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filter liquor to run simultaneously with hollow-fibre ultrafiltration device 3 device, prevent system pipeline and dynamical system from having impurity to enter rolling system, the second bag filter 5 that a precision is 25 microns is set before rolled film device 7.Dope is back to intermediate storage tank 4, by the constant temperature of intermediate storage tank 4 that is back to of plate type heat exchanger 6 at 25 DEG C.It is to be evaporated that scavenging solution after rolled film device 7 process sends into the second holding tank 8.Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the setting value that hollow-fibre ultrafiltration device 3 processes, and when after rolled film device 7 processes, qualified sodium thiocyanate solution reaches enter the first holding tank 1 feed liquid 95%.The desalted water B and the front batch that start surplus solution volume in 4 times of intermediate storage tanks of injection in intermediate storage tank 4 are injected rolled film device 7 after dilution water is dialysed and are collected in the 3rd holding tank 10 permeate of part.Desalted water add rear rolled film device 7 continue to concentrate, now rolled film device 7 purify after solution continue to be fed into the second holding tank 8 to be evaporated until go out liquid amass reach add dilution desalted water 1/18.The liquid that goes out of device 7 sends into the 3rd holding tank 10 afterwards, and the dilution water and the desalted water B that process as rolled film device 7 next batch are used in mixed way.
In intermediate storage tank 4 concentrated solution discharge as waste liquid concentrate separately, burning disposal or collect focuses on to sewage plant C is unified, the sodium rhodanate total amount wherein lost is in feedstock solution B the 0.8% of sodium rhodanate total amount.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8, through the concentration of quintuple effect evaporator 9, controls feed flow rate and becomes the sodium thiocyanate solution D of 51% concentration and condense water E, use other production link.After process above processes, reclaim sodium rhodanate and can reach 99.5%.
Embodiment 4
Step one:
The height that the production processes such as spinning produce is containing miscellaneous sodium thiocyanate solution A (control sodium rhodanate concentration and account for solution weight percent concentration 14%), and temperature controls at 35 DEG C, enters buffering the first holding tank 1 afterwards, excludes the oily substance in solution；The impurity such as the insoluble solid suspension during hereafter the first bag filter 2 through precision 100 microns filters interception solution；
Step 2:
Hollow-fibre ultrafiltration device 3 by the modified PVDF material of 60,000 molecular weight, the sodium thiocyanate solution leaching impurity after removing overwhelming majority oligomer is collected to intermediate storage tank 4, hollow-fibre ultrafiltration device uses cross-flow circulation and the blindest section of full filter type (cross flow filter: feed liquid is parallel to face flowing under the promotion of pump, the shearing force produced when feed liquid unlike dead-end filtration flows through face takes away the granule being detained on face, so that pollution layer is maintained at a relatively thin level), during cross-flow circulation, dope is back to the first holding tank 1.Hollow-fibre ultrafiltration device 3 filter liquor is measured by electromagnetic flowmeter batch, and when every batch filter liquor reaches setting value, ultrafiltration apparatus is out of service, treats that next batch processes after safeguarding；
Step 3:
Filtering accuracy is to start after 250 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filter liquor to run simultaneously with hollow-fibre ultrafiltration device 3 device, prevent system pipeline and dynamical system from having impurity to enter rolling system, the second bag filter 5 that a precision is 25 microns is set before rolled film device 7.Dope is back to intermediate storage tank 4, by the constant temperature of intermediate storage tank 4 that is back to of plate type heat exchanger 6 at 25 DEG C.It is to be evaporated that scavenging solution after rolled film device 7 process sends into the second holding tank 8.Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the setting value that hollow-fibre ultrafiltration device 3 processes, and when after rolled film device 7 processes, qualified sodium thiocyanate solution reaches enter the first holding tank 1 feed liquid 95%.The desalted water B and the front batch that start surplus solution volume in 5 times of intermediate storage tanks of injection in intermediate storage tank 4 are injected rolled film device 7 after dilution water is dialysed and are collected in the 3rd holding tank 10 permeate of part.Desalted water add rear rolled film device 7 continue to concentrate, now rolled film device 7 purify after solution continue to be fed into the second holding tank 8 to be evaporated until go out liquid amass reach add dilution desalted water 1/15.The liquid that goes out of device 7 sends into the 3rd holding tank 10 afterwards, and the dilution water and the desalted water B that process as rolled film device 7 next batch are used in mixed way.
In intermediate storage tank 4 concentrated solution discharge as waste liquid concentrate separately, burning disposal or collect focuses on to sewage plant C is unified, the sodium rhodanate total amount wherein lost is in feedstock solution B the 0.8% of sodium rhodanate total amount.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8, through the concentration of quintuple effect evaporator 9, controls feed flow rate and becomes the sodium thiocyanate solution D of 52% concentration and condense water E, use other production link.After process above processes, reclaim sodium rhodanate and can reach 99.5%.
Claims (3)
1. the purification recovery device of sodium thiocyanate water solution in a two step method acrylic fiber production process, it is characterized in that, including the first holding tank being sequentially communicated, first bag filter, hollow-fibre ultrafiltration device, intermediate storage tank, second bag filter, rolled film device, dope after described rolled film device processes is recycled to described intermediate storage tank, it is to be evaporated that scavenging solution sends into the second holding tank, and the pipeline between described rolled film device and the second storage tank is provided with a plate type heat exchanger, in described second holding tank, the evaporation liquid after evaporation enters the 3rd holding tank, sodium thiocyanate solution in described 3rd holding tank flow to vaporizer and concentrates.
Purification recovery device the most according to claim 1, it is characterised in that described 3rd holding tank connects with described intermediate storage tank.
Purification recovery device the most according to claim 1, it is characterised in that described hollow-fibre ultrafiltration device is provided with electromagnetic flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620231336.3U CN205442665U (en) | 2016-03-24 | 2016-03-24 | Purification recovery of sodium sulfocyanate aqueous solution in production of two step method acrylic fibres |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620231336.3U CN205442665U (en) | 2016-03-24 | 2016-03-24 | Purification recovery of sodium sulfocyanate aqueous solution in production of two step method acrylic fibres |
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| CN205442665U true CN205442665U (en) | 2016-08-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105621456A (en) * | 2016-03-24 | 2016-06-01 | 上海膜净水处理工程有限公司 | Purification recycling method and device for sodium thiocyanate solution in two-step method acrylic fiber production |
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2016
- 2016-03-24 CN CN201620231336.3U patent/CN205442665U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105621456A (en) * | 2016-03-24 | 2016-06-01 | 上海膜净水处理工程有限公司 | Purification recycling method and device for sodium thiocyanate solution in two-step method acrylic fiber production |
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