CN1033038A - Method with membrane separation technique purification Sodium Thiocyanate 99 - Google Patents
Method with membrane separation technique purification Sodium Thiocyanate 99 Download PDFInfo
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- CN1033038A CN1033038A CN 87107823 CN87107823A CN1033038A CN 1033038 A CN1033038 A CN 1033038A CN 87107823 CN87107823 CN 87107823 CN 87107823 A CN87107823 A CN 87107823A CN 1033038 A CN1033038 A CN 1033038A
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- CN
- China
- Prior art keywords
- film
- sulphur hydracid
- hydracid sodium
- desalinization
- solution
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/22—Alkali metal sulfides or polysulfides
- C01B17/32—Hydrosulfides of sodium or potassium
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A kind of method with sodium thiocyanate solution in membrane separation technique purification acrylic fiber production process and the chemical process.This law utilization difference is held back the film of characteristic, and through second-stage treatment, no phase transformation can obtain the solution of polymerization index.The first film with low ratio of desalinization of this method is removed oligopolymer and colloid, insoluble compound and other suspended substances in the solution, removes organic macromolecule and high valence ion with ratio of desalinization greater than 45% film again.Have the saving energy, do not need chemical agent, equipment is simpler, the characteristics that secondary pollution is few.
Description
The invention belongs to and purify and recovery sulphur hydracid sodium solution, both be applicable to that the recovery of sulphur hydracid sodium in the acrylic fiber production process technology was purified, also be applicable to the purification in the sulphur hydracid process for producing sodium.Produce in the acrylic fibers process in sulphur hydracid sodium method, remove as reusing the entrained impurity of sulphur hydracid sodium that solvent is used; In sulphur hydracid sodium production process, can purify and reclaim the sewage that contains sulphur hydracid sodium.
Purification sulphur hydracid sodium is removed the wherein method of impurity, and known have extraction process, recrystallization method and a gel method.Extraction process is the technology (" recovery and the purification of sulphur hydracid sodium solvent ", Ma Zhifa, textile industry press) of the domestic Britain Kao Taoerci company that introduces the earliest, adopt the liquid extraction method, make extraction agent, need a large amount of chemical reagent with isopropyl ether, as sulfuric acid and sodium hydroxide, and technical process is long.The recrystallization method that Shanghai general petrochemicals factory Acrylic Fibers Plant is developed voluntarily is that certain density sulphur hydracid sodium solution is concentrated, cools off, and then makes xln and water sepn realize purifying.These two kinds of methods are all based on phase change and migration mutually, so energy consumption is bigger, the cost height, and secondary pollution is serious.Japan's Ai Kesi synthetic fibre company up-to-date employing be that gel method reclaims sulphur hydracid sodium (" synthon ", 85, (2)) this method is to make through preliminary removal of impurities and evaporation concentration to reach the 58%(mass percent to concentration) sulphur hydracid sodium solution, part is passed through gel column, through absorption, drip washing, become concentration and be rare sulphur hydracid sodium solution of 10～20%, being mixed to concentration with part without 58% dense sulphur hydracid sodium solution of gel column again is 51.8%, deliver to polymeric segment, this has increased the load and the energy consumption of vaporizer undoubtedly, and technical process is also long.
It is low to the objective of the invention is to propose a kind of energy consumption, does not need chemical agent, and flow process is simple, is difficult for producing the sulphur hydracid sodium method of purification of secondary pollution, and another purpose is the application of developing membrane technique in China's Chemical Manufacture.
The invention is characterized in membrane separation technique is introduced among the purifying technique of sulphur hydracid sodium.
In the treating processes that the present invention proposes, the sulphur hydracid sodium solution of being purified by the film of different qualities, holds back impurity under certain pressure, and isolating principle is to utilize the different films of holding back characteristic, i.e. the film of different apertures is through second-stage treatment.At first use and the electricity of saliferous 700ppm left and right sides tap water is led ratio of desalinization remove oligopolymer and colloid, insoluble compound and other suspended substance in the solution, remove and remove pretreated purpose as secondary to reach one-level less than 25% mould material and assembly.Secondary is removed and is selected the film of ratio of desalinization between 45-86% for use, removes organic macromolecule and high valence ion, and can allow sulphur hydracid sodium pass through film.Ratio of desalinization is lower than 45%, can not reach the requirement that secondary is removed, and is higher than 86% and has belonged to unnecessary from economy and the investigation of removal of impurity index.One-level is handled and is adopted cheap low ratio of desalinization film to carry out ultrafiltration, can prevent the pollution of the higher second-stage treatment of price with film effectively, alleviates its load, increases the service life and the cleaning interval.The concentration of handling sulphur hydracid sodium solution is 3～30%, and its upper limit is to decide according to the solvent resistance of various mould materials and assembly; Lower limit is to be as the criterion so that solution is reclaimed the economy of purifying.But to the PS(polysulfones) and the PSA(polysulfonamides) film, be limited to 50% on its processing sulphur hydracid sodium solution.Be 1 year the work-ing life of film.
Can adopt following technical process to carry out processing operating process of the present invention: make one-level ultrafiltration film with ratio of desalinization less than 25% film, impure sulphur hydracid sodium solution is carried out one-level handle, circulation fluid is returned to primary filter, and all the other send to two-stage ultrafiltering.Two-stage ultrafiltering, adopting ratio of desalinization is 45～86% film, circulation fluid is partly returned to the one-level ultrafiltration after the second-stage treatment, another part after activated carbon treatment, be circulated to the one-level ultrafiltration before, all the other reclaim as qualified sulphur hydracid sodium solution.
Reclaim purification sulphur hydracid sodium solution with the inventive method, have following advantage:
1. need not use chemical agent, secondary pollution is few, and extraction process needs a large amount of chemical reagent, extraction process, and the sewage discharge of recrystallization method pollutes seriously.
2. the saving energy belongs to no phase transformation partition method, and recrystallization method and extraction process be all based on phase change and migration mutually, and the gel method Load Evaporator is bigger.
3. equipment and technical process are simpler, and maintenance management is easy.
The sulphur hydracid sodium solution of handling through the inventive method is behind the sulphur hydracid sodium of evaporation concentration to 51.8%, and impure less than 3%, the removal of impurity is satisfied the polymerization production requirement fully greater than 85%.
Embodiment 1
Commercially available various mould materials are carried out the hydracid of anti-sulphur sodium (solvent) test, and the result is as shown in table 1.
Wherein, it is 0～10% film that PS can make ratio of desalinization, and it is 0～95% film that PSA, CA, PAN can make ratio of desalinization.
Embodiment 2
To concentration is 10% and 50% the assorted sulphur hydracid sodium solution that contains, and carries out one-level with the CA film of different saliferous rates and handles result shown in the acquisition table 2.
Handle through one-level, remove oligopolymer and colloid, insoluble compound and other suspended substance in the solution.
Embodiment 3
To the concentration of coming from spinning workshop section in the acrylic fiber production process is 13% the assorted sulphur hydracid sodium solution that contains, and carries out second-stage treatment, and one-level is handled and adopted ratio of desalinization is 15% PS film, and second-stage treatment adopts the CA film of different ratio of desalinization respectively, at 18Kg/cm
2Pressure is running down, obtains result shown in the table 3.
Through second-stage treatment, organic macromolecule and high valence ion have been removed.
Embodiment 4
Identical with example 3, just the second-stage treatment film is the CA film of ratio of desalinization 86%, gained result such as table 4.
Sulphur hydracid sodium solution after the processing feeds intake by table 5 proportioning and to carry out aggregation test after evaporation concentration to concentration is 51.8%.
The sulphur hydracid sodium that same extraction process (impurities removing efficiency＞90%) is purified carries out polymerization relatively, result such as table 6.
Claims (5)
1, a kind of sulphur hydracid sodium that is used for acrylic fiber production process technological process and chemical process method of purifying and reclaiming is characterized in that adopting the membrane separation technique of second-stage treatment technology.
The method of 2, purification as claimed in claim 1, recovery sulphur hydracid sodium is characterized in that the sulphur hydracid sodium solution concentration range of processing is 3～30%.
The method of 3, purification as claimed in claim 1, recovery sulphur hydracid sodium is characterized in that it is various mould materials and assembly that one-level is handled with film.
4, purification as claimed in claim 3, reclaim the method for sulphur hydracid sodium, it is characterized in that it is that the electricity of the tap water about saliferous 700ppm is led ratio of desalinization is below 25% that one-level is handled characteristic with film.
5, purification as claimed in claim 1, reclaim the method for sulphur hydracid sodium, it is characterized in that the second-stage treatment film is that the electricity of the tap water about saliferous 700ppm is led ratio of desalinization is 45% to 86% mould material and assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107823 CN1033038A (en) | 1987-11-12 | 1987-11-12 | Method with membrane separation technique purification Sodium Thiocyanate 99 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107823 CN1033038A (en) | 1987-11-12 | 1987-11-12 | Method with membrane separation technique purification Sodium Thiocyanate 99 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1033038A true CN1033038A (en) | 1989-05-24 |
Family
ID=4816252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87107823 Pending CN1033038A (en) | 1987-11-12 | 1987-11-12 | Method with membrane separation technique purification Sodium Thiocyanate 99 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1033038A (en) |
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 |
-
1987
- 1987-11-12 CN CN 87107823 patent/CN1033038A/en active Pending
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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WD01 | Invention patent application deemed withdrawn after publication | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |