CN105621456A - Purification recycling method and device for sodium thiocyanate solution in two-step method acrylic fiber production - Google Patents
Purification recycling method and device for sodium thiocyanate solution in two-step method acrylic fiber production Download PDFInfo
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- CN105621456A CN105621456A CN201610171884.6A CN201610171884A CN105621456A CN 105621456 A CN105621456 A CN 105621456A CN 201610171884 A CN201610171884 A CN 201610171884A CN 105621456 A CN105621456 A CN 105621456A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/20—Thiocyanic acid; Salts thereof
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Abstract
The invention discloses a purification recycling method and a purification recycling device for a sodium thiocyanate solution in two-step method acrylic fiber production. The purification recycling method comprises the following steps: metering and collecting a solvent, pre-filtering, filtering by using a hollow fiber ultrafiltration membrane, filtering by using a spiral-wound membrane, and performing evaporation concentration. By adopting the purification recycling method and the purification recycling device, the mass of sodium thiocyanate in a waste liquid is not greater than 1% of the total mass of sodium thiocyanate in an original fed solution, more than 99% of sodium thiocyanate can be recycled, no chemical raw material such as caustic soda, sulfuric acid and kieselguhr is used in the production process, one time of evaporation concentration is reduced in comparison with that of a conventional purification recycling method, the amount of desalted water is reduced by more than 80%, the water for evaporation concentration is also greatly reduced, and the sewage discharge is also greatly reduced. Meanwhile, compared with a single nanofiltration membrane purification technique, the purification recycling method adopts the hollow fiber ultrafiltration membrane as a first purification treatment technique, and due to the stage treatment idea, not only is the purification effect stabilized, but also the stability of the technique in practical operation can be greatly improved.
Description
Technical field
The present invention relates to a kind of can not the method for purifying and recovering of sodium thiocyanate water solution and device in the method that uses of sewer process and solvent recycle and device, particularly two step method acrylic fiber production process.
Background technology
The two step method acrylic fiber production process process of great majority adopts sodium thiocyanate solution as polymerization solvent and molten silk cooling solvent, has the impurity such as sulfate ion, iron ion, P-SPN, P-SPA and enter into sodium thiocyanate solution in production link. Sodium thiocyanate solution recycles in acrylic fiber production process process, and the accumulation of impurity can cause many detrimentally affects, therefore has special solution purification remanufacture process to remove impurity.
Having multiple method to be used for purification of sodium thiocyanate solution via at present, preliminary purification adopts sodium hydroxide pellets method to remove the impurity iron ion in solution in conjunction with diatomite filtration or ion exchange method usually; Two step process adopt the method for evaporation concentration and Crystallization Separation usually; Three step process adopt and postpone some impurity that ion-exchange removes other, postpone ion-exchange resins and adopt sulfuric acid and sodium hydroxide regeneration, also have the simple membrane process craft adopting nanofiltration membrane in addition,
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 consumptions such as sulfuric acid used, sodium hydroxide, isopropyl ether are big, and cost height, dangerous big, environmental pollution is serious. And dust removal rate is low, make the quality of NaSCN solvent occur worsening, reflect the jaundice of original liquid coloring, fiber and production stability decline.
The rate of recovery of traditional sodium thiocyanate solution method for purifying and recovering can only reach 90% usually, due to the high energy consumption of evaporating, concentrating and crystallizing and the consumption of chemical agent (diatomite, sulfuric acid, sodium hydroxide), not only energy and material consumption cost height, and produce a large amount 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.
Summary of the invention
It is an object of the invention to provide a kind of high-recovery, low cost, high quality, and can the method for purifying and recovering of sodium thiocyanate water solution and device in the two step method acrylic fiber production process of steady running more, to solve prior art Problems existing.
For achieving the above object, the present invention is achieved by the following technical programs:
The method for purifying and recovering of sodium thiocyanate water solution in the two step method acrylic fiber production process of the present invention, comprises the following steps:
A. solvent metering collect: need to sodium thiocyanate solution to be processed carry out pre-treatment after be collected in storage tank;
B. pre-filtering: remove suspended solid insoluble in sodium thiocyanate solution in described storage tank and obtain filtered liquid;
C. hollow fiber ultrafiltration membrane is filtered: the described filtered liquid hollow fiber ultrafiltration membrane through step b is removed oligopolymer wherein;
D. rolled film filters: after the described solvent employing rolled film filtration being eliminated oligopolymer by step c, permeate directly enters evaporation concentration, after final concentrated 15-20 times, the de-salted water injecting 4-5 doubly described concentrated solution volume in gained concentrated solution obtains de-salted water concentrated solution, continuation rolled film filters, until the permeate of rolled film is the 1/15----1/20 of described de-salted water concentrated solution;
E. evaporation concentration: the permeate of described rolled film is carried out vacuum evaporation, straight only concentration reaches 50%-52% and namely obtains the sodium thiocyanate water solution that can be used as in two step method acrylic fiber production process and use.
As preferred technical scheme:
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, in described step a, pre-treatment refers to skim the oily substance except in solution.
The method for purifying and recovering of sodium thiocyanate water solution in footwork acrylic fiber production process of the present invention, utilizes deep bed filter to carry out described pre-filtering in described step b.
The method for purifying and recovering of sodium thiocyanate water solution in footwork acrylic fiber production process of the present invention, hollow fiber ultrafiltration membrane described in step c is filtered and is adopted cross flow filter and the full filter type of final cecum.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, in described steps d, after the described solvent employing rolled film filtration being eliminated oligopolymer by step c, wherein, the concentrated solution not filtered burning disposal after evaporation concentration.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, the Sodium Thiocyanate 99 weight percent concentration entering step a is no more than 17%.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, the sodium thiocyanate water solution temperature entering step a is 15��45 DEG C.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, described hollow fiber ultrafiltration membrane is the modification PVDF material that aperture is about 50,000 10 hundred million molecular weight.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, the rolled film filtering accuracy of described steps d is 150��600 molecular weight.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention, after steps d processes, the described concentrated solution not filtered is no more than 1% containing Sodium Thiocyanate 99 mass percent.
The present invention also proposes a kind of device carrying out method for purifying and recovering as above, comprise the first holding tank being connected successively, first deep bed filter, hollow-fibre ultrafiltration device, relay tank, 2nd deep bed filter, rolled film device, dope after described rolled film device processes is recycled to described relay tank, it is to be evaporated that scavenging solution sends into the 2nd holding tank, and the pipeline between described rolled film device and the 2nd storage tank is provided with a plate-type heat exchanger, evaporated liquor after evaporating in described 2nd holding tank enters the 3rd holding tank, sodium thiocyanate solution in described 3rd holding tank flow to vaporizer and concentrates.
Device of the present invention, described 3rd holding tank is connected with described relay tank.
Useful effect
Compared with prior art, tool has the following advantages in the present invention:
Apparatus of the present invention structure is simple, easily operation, after adopting the device Recovery Purifying of the present invention, the total mass that in waste liquid, the quality of Sodium Thiocyanate 99 accounts for Sodium Thiocyanate 99 in former feedstock solution is no more than 1%, reclaim Sodium Thiocyanate 99 and can reach more than 99%, production process does not need to add the chemical feedstockss such as caustic soda, sulfuric acid, diatomite, single vaporization concentration process is reduced than common tradition method for purifying and recovering, de-salted water consumption reduces more than 80%, the evaporation concentration water yield also greatly reduces, and quantity of wastewater effluent also greatly reduces. Meanwhile, comparing simple employing nanofiltration membrane impurity removing technology, the present invention utilizes hollow fiber ultrafiltration membrane as first removal of impurities process technology, adopts stage treatment theory can not only stablize the effect of removal of impurities, also can greatly improve the stability of this technology in actual motion.
Accompanying drawing explanation
Fig. 1 is the structure block diagram of the purification recovery device of sodium thiocyanate water solution in two step method acrylic fiber production process of the present invention
Embodiment
Below in conjunction with embodiment, set forth the present invention further. Limit the scope of the invention it will be understood that these embodiments are only not used in for illustration of the present invention. In addition it will be understood that after having read the content that the present invention lectures, the present invention can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application's appended claims limited range equally.
As shown in Figure 1, the purification recovery device of sodium thiocyanate water solution in the two step method acrylic fiber production process of the present invention, comprise the first holding tank 1 being connected successively, first deep bed filter 2, hollow-fibre ultrafiltration device 3, relay tank 4, 2nd deep bed filter 5, rolled film device 7, dope after rolled film device 7 processes is recycled to relay tank 4, it is to be evaporated that scavenging solution sends into the 2nd holding tank 8, and the pipeline between rolled film device 7 and the 2nd storage tank 8 is provided with a plate-type heat exchanger 6, evaporated liquor after evaporating in 2nd holding tank 8 enters the 3rd holding tank 10, sodium thiocyanate solution in 3rd holding tank flow to vaporizer and concentrates. 3rd holding tank 10 is connected with relay tank 4.
Embodiment 1
Step one:
The height that the production processes such as spinning produce is containing assorted sodium thiocyanate solution A (control Sodium Thiocyanate 99 concentration accounts for solution weight percentage concentration 17%), and temperature controls at 15 DEG C, enters buffering the first holding tank 1 afterwards, skims except the oily substance in solution; Hereafter the first deep bed filter 2 through precision 100 microns filters the impurity such as insoluble suspended solid in interception solution;
Step 2:
By the hollow-fibre ultrafiltration device 3 of the modification PVDF material of 50,000 molecular weight, the sodium thiocyanate solution filtering out impurity after removing overwhelming majority oligopolymer is collected into relay tank 4, hollow-fibre ultrafiltration device adopts cross-flow circulation and the full filter type of final cecum (cross flow filter: feed liquid is parallel to the flowing of film face under the promotion of pump, filter the difference is that the shearing force produced when feed liquid flows through film face takes away the particle being detained on film face with cecum, thus make pollution layer remain on a thinner level), when cross-flow circulates, dope is back to the first holding tank 1. Hollow-fibre ultrafiltration device 3 filtrate is measured by magnetic flow meter batch, and when every batch of filtrate reaches set(ting)value, ultra-filtration equipment is out of service, treats that next batch processes after safeguarding;
Step 3:
Filtering accuracy is start and hollow-fibre ultrafiltration device 3 device synchronous operation after 150 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filtrate, prevent system pipeline and power system from having impurity to enter rolling system, the 2nd deep bed filter 5 that a precision is 25 microns is set before rolled film device 7. Dope is back to relay tank 4, by the constant temperature being back to relay tank 4 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 2nd holding tank 8. Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the set(ting)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%. Start to inject the de-salted water B of surplus solution volume in 5 times of relay tanks in relay tank 4 and front batch inject dilution water dialyse after rolled film device 7 be collected in the permeate of the 3rd holding tank 10 part. De-salted water adds rear rolled film device 7 and still continues to concentrate, now rolled film device 7 purify after solution continue to be fed into the 2nd holding tank 8 to be evaporated until fluid volume reach add dilution de-salted water 1/2. The fluid of device 7 sends into the 3rd holding tank 10 afterwards, and dilution water and de-salted water B as the process of rolled film device 7 next batch are used in combination.
In relay tank 4, concentrated solution discharges concentrated, burning disposal or be collected into that sewage plant C is unified to be focused on separately as waste liquid, and the Sodium Thiocyanate 99 total amount wherein lost is 0.9% of Sodium Thiocyanate 99 total amount in feedstock solution B.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8 concentrating through five single-effect evaporators 9, control charging flow velocity becomes the sodium thiocyanate solution D and condensed water E of 52% concentration, uses other production link. After above art breading, reclaim Sodium Thiocyanate 99 and can reach 99.2%.
Embodiment 2
Step one:
The height that the production processes such as spinning produce is containing assorted sodium thiocyanate solution A (control Sodium Thiocyanate 99 concentration accounts for solution weight percentage concentration 16%), and temperature controls at 45 DEG C, enters buffering the first holding tank 1 afterwards, skims except the oily substance in solution; Hereafter the first deep bed filter 2 through precision 100 microns filters the impurity such as insoluble suspended solid in interception solution;
Step 2:
By the hollow-fibre ultrafiltration device 3 of the modification PVDF material of 100,000 molecular weight, the sodium thiocyanate solution filtering out impurity after removing overwhelming majority oligopolymer is collected into relay tank 4, hollow-fibre ultrafiltration device adopts cross-flow circulation and finally blind section of full filter type (cross flow filter: feed liquid is parallel to the flowing of film face under the promotion of pump, with dead-end filtration the difference is that the shearing force produced when feed liquid flows through film face takes away the particle being detained on film face, thus make pollution layer remain on a thinner level), when cross-flow circulates, dope is back to the first holding tank 1. Hollow-fibre ultrafiltration device 3 filtrate is measured by magnetic flow meter batch, and when every batch of filtrate reaches set(ting)value, ultra-filtration equipment is out of service, treats that next batch processes after safeguarding;
Step 3:
Filtering accuracy is start and hollow-fibre ultrafiltration device 3 device synchronous operation after 500 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filtrate, prevent system pipeline and power system from having impurity to enter rolling system, the 2nd deep bed filter 5 that a precision is 25 microns is set before rolled film device 7. Dope is back to relay tank 4, by the constant temperature being back to relay tank 4 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 2nd holding tank 8. Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the set(ting)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%. Start to inject the de-salted water B of surplus solution volume in 4 times of relay tanks 4 in relay tank 4 and front batch inject dilution water dialyse after rolled film device 7 be collected in the permeate of the 3rd holding tank 10 part. De-salted water adds rear rolled film device 7 and still continues to concentrate, now rolled film device 7 purify after solution continue to be fed into the 2nd holding tank 8 to be evaporated until fluid volume reach add dilution de-salted water 1/20. The fluid of device 7 sends into the 3rd holding tank 10 afterwards, and dilution water and de-salted water B as the process of rolled film device 7 next batch are used in combination.
In relay tank 4, concentrated solution discharges concentrated, burning disposal or be collected into that sewage plant C is unified to be focused on separately as waste liquid, and the Sodium Thiocyanate 99 total amount wherein lost is 0.85% of Sodium Thiocyanate 99 total amount in feedstock solution B.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8 concentrating through five single-effect evaporators 9, control charging flow velocity becomes the sodium thiocyanate solution D and condensed water E of 50% concentration, uses other production link. After above art breading, reclaim Sodium Thiocyanate 99 and can reach 99.6%.
Embodiment 3
Step one:
The height that the production processes such as spinning produce is containing assorted sodium thiocyanate solution A (control Sodium Thiocyanate 99 concentration accounts for solution weight percentage concentration 15%), and temperature controls at 25 DEG C, enters buffering the first holding tank 1 afterwards, skims except the oily substance in solution; Hereafter the first deep bed filter 2 through precision 100 microns filters the impurity such as insoluble suspended solid in interception solution;
Step 2:
By the hollow-fibre ultrafiltration device 3 of the modification PVDF material of 80,000 molecular weight, the sodium thiocyanate solution filtering out impurity after removing overwhelming majority oligopolymer is collected into relay tank 4, hollow-fibre ultrafiltration device adopts cross-flow circulation and finally blind section of full filter type (cross flow filter: feed liquid is parallel to the flowing of film face under the promotion of pump, with dead-end filtration the difference is that the shearing force produced when feed liquid flows through film face takes away the particle being detained on film face, thus make pollution layer remain on a thinner level), when cross-flow circulates, dope is back to the first holding tank 1. Hollow-fibre ultrafiltration device 3 filtrate is measured by magnetic flow meter batch, and when every batch of filtrate reaches set(ting)value, ultra-filtration equipment is out of service, treats that next batch processes after safeguarding;
Step 3:
Filtering accuracy is start and hollow-fibre ultrafiltration device 3 device synchronous operation after 450 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filtrate, prevent system pipeline and power system from having impurity to enter rolling system, the 2nd deep bed filter 5 that a precision is 25 microns is set before rolled film device 7. Dope is back to relay tank 4, by the constant temperature being back to relay tank 4 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 2nd holding tank 8. Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the set(ting)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%. Start to inject the de-salted water B of surplus solution volume in 4 times of relay tanks in relay tank 4 and front batch inject dilution water dialyse after rolled film device 7 be collected in the permeate of the 3rd holding tank 10 part. De-salted water adds rear rolled film device 7 and still continues to concentrate, now rolled film device 7 purify after solution continue to be fed into the 2nd holding tank 8 to be evaporated until fluid volume reach add dilution de-salted water 1/18. The fluid of device 7 sends into the 3rd holding tank 10 afterwards, and dilution water and de-salted water B as the process of rolled film device 7 next batch are used in combination.
In relay tank 4, concentrated solution discharges concentrated, burning disposal or be collected into that sewage plant C is unified to be focused on separately as waste liquid, and the Sodium Thiocyanate 99 total amount wherein lost is 0.8% of Sodium Thiocyanate 99 total amount in feedstock solution B.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8 concentrating through five single-effect evaporators 9, control charging flow velocity becomes the sodium thiocyanate solution D and condensed water E of 51% concentration, uses other production link. After above art breading, reclaim Sodium Thiocyanate 99 and can reach 99.5%.
Embodiment 4
Step one:
The height that the production processes such as spinning produce is containing assorted sodium thiocyanate solution A (control Sodium Thiocyanate 99 concentration accounts for solution weight percentage concentration 14%), and temperature controls at 35 DEG C, enters buffering the first holding tank 1 afterwards, skims except the oily substance in solution; Hereafter the first deep bed filter 2 through precision 100 microns filters the impurity such as insoluble suspended solid in interception solution;
Step 2:
By the hollow-fibre ultrafiltration device 3 of the modification PVDF material of 60,000 molecular weight, the sodium thiocyanate solution filtering out impurity after removing overwhelming majority oligopolymer is collected into relay tank 4, hollow-fibre ultrafiltration device adopts cross-flow circulation and finally blind section of full filter type (cross flow filter: feed liquid is parallel to the flowing of film face under the promotion of pump, with dead-end filtration the difference is that the shearing force produced when feed liquid flows through film face takes away the particle being detained on film face, thus make pollution layer remain on a thinner level), when cross-flow circulates, dope is back to the first holding tank 1. Hollow-fibre ultrafiltration device 3 filtrate is measured by magnetic flow meter batch, and when every batch of filtrate reaches set(ting)value, ultra-filtration equipment is out of service, treats that next batch processes after safeguarding;
Step 3:
Filtering accuracy is start and hollow-fibre ultrafiltration device 3 device synchronous operation after 250 molecular weight rolled film devices 7 receive hollow-fibre ultrafiltration device 3 filtrate, prevent system pipeline and power system from having impurity to enter rolling system, the 2nd deep bed filter 5 that a precision is 25 microns is set before rolled film device 7. Dope is back to relay tank 4, by the constant temperature being back to relay tank 4 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 2nd holding tank 8. Until the amount of solution that hollow-fibre ultrafiltration device 3 is sent to medial launder 4 reaches the set(ting)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%. Start to inject the de-salted water B of surplus solution volume in 5 times of relay tanks in relay tank 4 and front batch inject dilution water dialyse after rolled film device 7 be collected in the permeate of the 3rd holding tank 10 part. De-salted water adds rear rolled film device 7 and still continues to concentrate, now rolled film device 7 purify after solution continue to be fed into the 2nd holding tank 8 to be evaporated until fluid volume reach add dilution de-salted water 1/15. The fluid of device 7 sends into the 3rd holding tank 10 afterwards, and dilution water and de-salted water B as the process of rolled film device 7 next batch are used in combination.
In relay tank 4, concentrated solution discharges concentrated, burning disposal or be collected into that sewage plant C is unified to be focused on separately as waste liquid, and the Sodium Thiocyanate 99 total amount wherein lost is 0.8% of Sodium Thiocyanate 99 total amount in feedstock solution B.
Step 4:
Cleaning sodium thiocyanate solution in solution the 3rd holding tank 8 concentrating through five single-effect evaporators 9, control charging flow velocity becomes the sodium thiocyanate solution D and condensed water E of 52% concentration, uses other production link. After above art breading, reclaim Sodium Thiocyanate 99 and can reach 99.5%.
Claims (10)
1. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process, it is characterised in that, comprise the following steps:
A. solvent metering collect: need to sodium thiocyanate solution to be processed carry out pre-treatment after be collected in storage tank;
B. pre-filtering: remove suspended solid insoluble in sodium thiocyanate solution in described storage tank and obtain filtered liquid;
C. hollow fiber ultrafiltration membrane is filtered: the described filtered liquid hollow fiber ultrafiltration membrane through step b is removed oligopolymer wherein;
D. rolled film filters: after the described solvent employing rolled film filtration being eliminated oligopolymer by step c, permeate directly enters evaporation concentration, after final concentrated 15-20 times, the de-salted water injecting 4-5 doubly described concentrated solution volume in gained concentrated solution obtains de-salted water concentrated solution, continuation rolled film filters, until the permeate of rolled film is the 1/15----1/20 of described de-salted water concentrated solution;
E. evaporation concentration: the permeate of described rolled film is carried out vacuum evaporation, straight only concentration reaches 50%-52% and namely obtains the sodium thiocyanate water solution that can be used as in two step method acrylic fiber production process and use.
2. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterised in that, in described step a, pre-treatment refers to skim the oily substance except in solution.
3. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterised in that, described step b utilize deep bed filter carry out described pre-filtering.
The method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterised in that, hollow fiber ultrafiltration membrane described in step c is filtered and is adopted cross flow filter and the full filter type of final cecum.
4. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterized in that, in described steps d, after the described solvent employing rolled film filtration being eliminated oligopolymer by step c, wherein, the concentrated solution not filtered burning disposal after evaporation concentration.
5. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterised in that, the Sodium Thiocyanate 99 weight percent concentration entering step a is no more than 17%; The sodium thiocyanate water solution temperature entering step a is 15��45 DEG C.
6. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterised in that, described hollow fiber ultrafiltration membrane is the modification PVDF material that aperture is about 50,000 10 ten thousand molecular weight.
7. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 1, it is characterised in that, the rolled film filtering accuracy of steps d is 150��600 molecular weight.
8. the method for purifying and recovering of sodium thiocyanate water solution in two step method acrylic fiber production process according to claim 2, it is characterised in that, after steps d processes, the described concentrated solution not filtered is no more than 1% containing Sodium Thiocyanate 99 mass percent.
9. one kind carries out the device of method for purifying and recovering according to claim 1, it is characterized in that, comprise the first holding tank being connected successively, first deep bed filter, hollow-fibre ultrafiltration device, relay tank, 2nd deep bed filter, rolled film device, dope after described rolled film device processes is recycled to described relay tank, it is to be evaporated that scavenging solution sends into the 2nd holding tank, and the pipeline between described rolled film device and the 2nd storage tank is provided with a plate-type heat exchanger, evaporated liquor after evaporating in described 2nd holding tank enters the 3rd holding tank, sodium thiocyanate solution in described 3rd holding tank flow to vaporizer and concentrates.
10. device according to claim 9, it is characterised in that, described 3rd holding tank is connected with described relay tank.
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| CN109796030A (en) * | 2019-03-22 | 2019-05-24 | 扬州康龙环保工程有限公司 | A kind of method of the ammonium thiocyanate, the purification of sodium sulfocyanate product that are extracted in coking desulfurization waste liquor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109796030A (en) * | 2019-03-22 | 2019-05-24 | 扬州康龙环保工程有限公司 | A kind of method of the ammonium thiocyanate, the purification of sodium sulfocyanate product that are extracted in coking desulfurization waste liquor |
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