CN115180698A - Method for treating superfine fiber suedette alkali-reduction splitting wastewater by using calcium lignosulfonate - Google Patents
Method for treating superfine fiber suedette alkali-reduction splitting wastewater by using calcium lignosulfonate Download PDFInfo
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- CN115180698A CN115180698A CN202210850939.1A CN202210850939A CN115180698A CN 115180698 A CN115180698 A CN 115180698A CN 202210850939 A CN202210850939 A CN 202210850939A CN 115180698 A CN115180698 A CN 115180698A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 50
- 229920005551 calcium lignosulfonate Polymers 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000835 fiber Substances 0.000 title claims abstract description 27
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 title claims abstract description 18
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003513 alkali Substances 0.000 claims abstract description 31
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000013585 weight reducing agent Substances 0.000 claims abstract description 14
- 239000006228 supernatant Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000000047 product Substances 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 229920001410 Microfiber Polymers 0.000 claims description 7
- 239000003658 microfiber Substances 0.000 claims description 3
- 208000016261 weight loss Diseases 0.000 claims 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000003916 acid precipitation Methods 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 239000010985 leather Substances 0.000 description 4
- 159000000007 calcium salts Chemical class 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- CPGKMLVTFNUAHL-UHFFFAOYSA-N [Ca].[Ca] Chemical compound [Ca].[Ca] CPGKMLVTFNUAHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- -1 calcium chloride Chemical class 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- VIQSRHWJEKERKR-UHFFFAOYSA-L disodium;terephthalate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 VIQSRHWJEKERKR-UHFFFAOYSA-L 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000007344 nucleophilic reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003503 terephthalic acid derivatives Chemical class 0.000 description 1
- 150000003504 terephthalic acids Chemical class 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5272—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using specific organic precipitants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention belongs to the technical field of alkali weight reduction wastewater treatment, and discloses a method for treating superfine fiber suede-like suede alkali weight reduction fiber opening wastewater by using calcium lignosulphonate. Adding calcium lignosulfonate into alkali decrement fiber opening wastewater, uniformly mixing, adding acid to adjust the pH value of a solution to 2-10, standing, and performing solid-liquid separation to obtain a supernatant and a solid; washing and drying the solid to obtain a terephthalic acid product; wherein, the alkali decrement fiber-opening wastewater contains terephthalate; the mass mol ratio of the calcium lignosulphonate to the terephthalate is 3-8 g: 5-10 mmol. The calcium lignosulfonate has the advantages of low application cost, easy degradation, sustainability, environmental protection and the like. The treatment method of the invention greatly reduces the COD value in the wastewater, reduces the difficulty for the subsequent treatment of the wastewater, and can recycle a large amount of terephthalic acid solid, thus reusing the waste in the wastewater and reducing the production cost.
Description
Technical Field
The invention relates to the technical field of alkali weight reduction wastewater treatment, in particular to a method for treating superfine fiber suede-like suede alkali weight reduction fiber opening wastewater by using calcium lignosulphonate.
Background
The polyester or polyamide superfine fiber is generally composed of sea phase polyester and island phase (polyester or polyamide), and after being made into suede fabric, the suede fabric is widely used for manufacturing automotive interiors, shoe materials, bags, clothes and the like. Polyester macromolecules and sodium hydroxide are subjected to multiphase hydrolysis reaction, ester bonds in the macromolecules are subjected to nucleophilic reaction hydrolysis fracture, the hydrolysis reaction is gradually performed on the surface of the fiber from outside to inside, and hydrolysis products with different polymerization degrees are continuously separated out from the surface of the fiber and enter a sodium hydroxide aqueous solution. The concentration of the terephthalic acid in the generated alkali deweighting wastewater is high, the pH value is high, and the chemical oxygen demand (COD value) is high; the CODcr value of the alkali-reduced wastewater of the company accounts for more than 70 percent of the CODcr value of all the printing and dyeing wastewater, and the sodium terephthalate contributes 80 percent of the CODcr value of the alkali-reduced wastewater, so that if the alkali-reduced wastewater is directly discharged, the environmental pollution is serious, the resources are wasted, the alkali-reduced wastewater is difficult to effectively remove by adopting a conventional printing and dyeing wastewater treatment system, and all the treated wastewater cannot reach the discharge standard.
At present, the recovery of terephthalic acid in wastewater by acid precipitation is one of the most common treatment methods in the prior art, for example, patent CN102234226A discloses a method for recovering and purifying terephthalic acid from alkali weight reduction waste liquid, which comprises adding 5-20% diluted acid solution to perform acid precipitation until the pH is 2-3, and precipitating white terephthalic acid solid. Although the acid precipitation method has high recovery rate of terephthalic acid, the acid addition amount is large, the system needs to be adjusted to be strongly acidic, and the alkali needs to be added to adjust the system to be neutral when the waste liquid after acid precipitation is discharged, so that the treatment cost is increased, the raw material consumption is excessive, and the method does not meet the policy of green production advocated at present.
In consideration of the problems of recycling economy, sustainable development of environment, reduction of burden of subsequent wastewater treatment and the like, the invention provides a method and process innovation on how to treat alkali-reduced wastewater efficiently and economically and recover terephthalic acid from the alkali-reduced wastewater.
Disclosure of Invention
The invention aims to provide a method for treating superfine fiber suede-like leather alkali-reduction fiber-opening wastewater by using calcium lignosulfonate, which solves the problems of the existing alkali-reduction wastewater treatment technology.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for treating superfine fiber suede-like leather alkali reduction opening wastewater by using calcium lignosulphonate, which comprises the following steps:
adding calcium lignosulfonate into the alkali-reduction fiber opening wastewater, mixing, adding an acid to adjust the pH value, standing, and performing solid-liquid separation to obtain a supernatant and a solid; washing and drying the solid to obtain a terephthalic acid product;
wherein, the alkali weight reduction fiber opening wastewater contains terephthalate; the mass mol ratio of the calcium lignosulphonate to the terephthalate is 3-8 g: 5-10 mmol.
Preferably, in the method for treating alkali-minimization opening wastewater of ultrafine fiber suede with calcium lignosulfonate, a COD value in the alkali-minimization opening wastewater is 10000 to 30000mg/L.
Preferably, in the above method for treating the microfine fiber suede nap alkali deweighting wastewater by using calcium lignosulfonate, the pH is adjusted to 2 to 10.
Preferably, in the method for treating the superfine fiber suede nap alkali weight reduction opening wastewater by using calcium lignosulfonate, the standing time is 2 to 3 hours.
Calcium salt is added into the superfine fiber suede-like alkali decrement fiber-opening wastewater and the pH value of the solution is adjusted, so that insoluble or water-insoluble terephthalate precipitate can be generated, the recovery of terephthalic acid is realized, and the wastewater is purified. The invention firstly replaces the traditional inorganic calcium salt with the organic calcium salt-calcium lignosulfonate to realize the treatment of alkali-reduction fiber-opening wastewater by a salting-out method, the calcium lignosulfonate is a byproduct in the paper-making industry, the application cost is lower than that of the inorganic calcium salt such as calcium chloride, the application expands the application range of the calcium lignosulfonate, the calcium lignosulfonate is recycled for the second time, and the lignin belongs to natural renewable resources, and has the advantages of easy degradation, sustainability, environmental protection and the like.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the calcium lignosulfonate used in the invention has the advantages of low application cost, easy degradation, sustainability, environmental protection and the like. The treatment method of the invention greatly reduces the COD value in the wastewater, reduces the difficulty for the subsequent treatment of the wastewater, can recycle a large amount of terephthalic acid solid, recycles the waste in the wastewater and reduces the production cost.
Detailed Description
The invention provides a method for treating superfine fiber suede-like leather alkali reduction opening wastewater by using calcium lignosulphonate, which comprises the following steps:
adding calcium lignosulphonate into the alkali-reduction fiber opening wastewater, uniformly mixing, adding acid to adjust the pH value, standing, and carrying out solid-liquid separation to obtain supernatant and solid; washing and drying the solid to obtain a terephthalic acid product;
wherein, the alkali weight reduction fiber opening wastewater contains terephthalate; the mass mol ratio of the calcium lignosulphonate to the terephthalate is 3-8 g: 5-10 mmol.
In the present invention, the mass molar ratio of calcium lignosulfonate to terephthalate is preferably 3 to 8g:5 to 10mmol, more preferably 4 to 7g:6 to 9mmol, more preferably 6g:7mmol.
In the invention, the COD value in the alkali-reduction fiber-opening wastewater is preferably 10000-30000 mg/L.
In the present invention, the pH adjustment is preferably 2 to 10, more preferably 3 to 9, and still more preferably 5; the pH is adjusted preferably with 25% to 98% sulfuric acid, more preferably 50% to 98%, and still more preferably 72%.
In the present invention, the standing time is preferably 2 to 3 hours, more preferably 2.2 to 2.9 hours, and still more preferably 2.6 hours; the temperature of the standing is preferably room temperature.
In the present invention, the solid-liquid separation is preferably centrifugation.
In the present invention, the number of washing with water is preferably 1 to 3, more preferably 2 to 3, and still more preferably 3; the drying temperature is preferably 90 to 120 ℃, more preferably 92 to 115 ℃, and more preferably 110 ℃; the drying time is preferably 60 to 100min, more preferably 70 to 90min, and still more preferably 80min.
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a method for treating superfine fiber suede-like leather alkali reduction opening wastewater by using calcium lignosulfonate, which comprises the following steps of:
selecting 100mL of alkali-reduction fiber-opening wastewater, wherein the concentration of terephthalate is 0.14mol/L, and the COD value is 27400mg/L; adding 6g of calcium lignosulphonate, uniformly mixing, adjusting the pH value to 3 by using 50% sulfuric acid, and standing at room temperature for 2 hours; centrifuging after standing to obtain supernatant and solid; washing the solid with water for 3 times in sequence, and drying at 90 ℃ for 100min to obtain a terephthalic acid solid; the concentration of terephthalic acid salt in the supernatant was measured, and the settling rate of terephthalic acid was calculated.
The determination method of the concentration of the terephthalate in the supernatant comprises the following steps:
the absorbance of the supernatant was measured using an ultraviolet-visible spectrophotometer and substituted into the absorbance-concentration standard curve regression equation for the terephthalate solution (a =13083x 2 =0.9998, A is absorbance value of the sample solution at 238nm, x is concentration of terephthalate, mol/L), and supernatant (i.e. treated alkali weight reduction fiber opening wastewater)) The concentration of medium terephthalate.
The formula for calculating the settling rate of terephthalic acid is as follows:
d-precipitation ratio of precipitate in solution (%)
C1-concentration of terephthalate in stock solution (mol/L)
C2-concentration of terephthalate in supernatant (mol/L)
Example 2
This example provides a method for treating ultrafine fiber suede alkali-reduction splitting wastewater by using calcium lignosulfonate, which is described in example 1, except that the pH is adjusted to 5.
Example 3
This example provides a method for treating ultrafine fiber suede alkali-reduction splitting wastewater by using calcium lignosulfonate, which is described in example 1, except that the pH is adjusted to 7.
Example 4
This example provides a method for treating microfiber suede-like waste water from alkali-reduction opening of microfiber by using calcium lignosulfonate, which is described in example 1, except that the pH is adjusted to 10.
The results of the settling rate and the COD value after treatment of the terephthalic acids of examples 1 to 4 are shown in Table 1.
TABLE 1 settling rate of terephthalic acid and COD value after treatment
| Sample(s) | The settling rate of terephthalic acid% | COD value mg/L after treatment |
| Example 1 | 96.23 | 2679 |
| Example 2 | 92.56 | 2960 |
| Example 3 | 89.28 | 4277 |
| Example 4 | 81.40 | 5845 |
As can be seen from Table 1, when the pH value is 3, the COD value after treatment is 2679mg/L, the settling rate of the terephthalic acid is 96.23%, and the process has high terephthalic acid recovery rate and COD removal effect, but the process needs to consume a large amount of acid solution and is easy to cause secondary pollution. When the pH is 7, the recovery rate of terephthalic acid and the COD removing effect are slightly inferior to those of the treatment with pH 3, but the waste liquid after the treatment can be directly discharged without subsequent treatment operations such as pH value adjustment and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (4)
1. A method for treating superfine fiber suede finish alkali decrement fiber opening wastewater by adopting calcium lignosulphonate is characterized by comprising the following steps:
adding calcium lignosulphonate into the alkali-reduction fiber opening wastewater, mixing, adding acid to adjust the pH value, standing, and carrying out solid-liquid separation to obtain supernatant and solid; washing and drying the solid to obtain a terephthalic acid product;
wherein, the alkali weight reduction fiber opening wastewater contains terephthalate; the mass mol ratio of the calcium lignosulphonate to the terephthalate is 3-8 g: 5-10 mmol.
2. The method for treating alkali weight reduction opening wastewater of microfiber suede with calcium lignosulfonate according to claim 1, wherein COD value in the alkali weight reduction opening wastewater is 10000-30000 mg/L.
3. The method for treating the ultrafine fiber suede tone alkali weight-reduction defibering wastewater according to claim 1 or 2, wherein the pH value is adjusted to 2-10.
4. The method for treating the superfine fiber suede-like alkali weight-reduction defibering wastewater by using the calcium lignosulphonate as claimed in claim 3, wherein the standing time is 2-3 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210850939.1A CN115180698A (en) | 2022-07-20 | 2022-07-20 | Method for treating superfine fiber suedette alkali-reduction splitting wastewater by using calcium lignosulfonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210850939.1A CN115180698A (en) | 2022-07-20 | 2022-07-20 | Method for treating superfine fiber suedette alkali-reduction splitting wastewater by using calcium lignosulfonate |
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| Publication Number | Publication Date |
|---|---|
| CN115180698A true CN115180698A (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210850939.1A Pending CN115180698A (en) | 2022-07-20 | 2022-07-20 | Method for treating superfine fiber suedette alkali-reduction splitting wastewater by using calcium lignosulfonate |
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| Country | Link |
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| CN (1) | CN115180698A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06172259A (en) * | 1992-12-09 | 1994-06-21 | Asahi Chem Ind Co Ltd | Treatment of waste liquid generated in alkaline weight reduction of polyester fiber |
| JP2005047877A (en) * | 2003-07-31 | 2005-02-24 | Fukui Prefecture | Method for recovering terephthalic acid |
| CN1686871A (en) * | 2005-04-23 | 2005-10-26 | 陈一鸣 | Method for preparing antiager from wastewater of alkali weight reduction |
| CN101941769A (en) * | 2010-09-10 | 2011-01-12 | 常州大学 | Method for pre-treating alkali PTA wastewater by using combined flocculating agent |
| CN103922926A (en) * | 2014-04-17 | 2014-07-16 | 绍兴县远程树脂科技有限公司 | Process for purifying residual solid waste generated after alkali peeling wastewater treatment |
| CN110937762A (en) * | 2019-12-26 | 2020-03-31 | 河南省科学院化学研究所有限公司 | PVA-containing desizing printing and dyeing wastewater pretreatment method |
| CN112875749A (en) * | 2021-02-25 | 2021-06-01 | 江苏爱特恩高分子材料有限公司 | Method for preparing high-dispersion titanium dioxide by recycling alkali-reduced wastewater |
-
2022
- 2022-07-20 CN CN202210850939.1A patent/CN115180698A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06172259A (en) * | 1992-12-09 | 1994-06-21 | Asahi Chem Ind Co Ltd | Treatment of waste liquid generated in alkaline weight reduction of polyester fiber |
| JP2005047877A (en) * | 2003-07-31 | 2005-02-24 | Fukui Prefecture | Method for recovering terephthalic acid |
| CN1686871A (en) * | 2005-04-23 | 2005-10-26 | 陈一鸣 | Method for preparing antiager from wastewater of alkali weight reduction |
| CN101941769A (en) * | 2010-09-10 | 2011-01-12 | 常州大学 | Method for pre-treating alkali PTA wastewater by using combined flocculating agent |
| CN103922926A (en) * | 2014-04-17 | 2014-07-16 | 绍兴县远程树脂科技有限公司 | Process for purifying residual solid waste generated after alkali peeling wastewater treatment |
| CN110937762A (en) * | 2019-12-26 | 2020-03-31 | 河南省科学院化学研究所有限公司 | PVA-containing desizing printing and dyeing wastewater pretreatment method |
| CN112875749A (en) * | 2021-02-25 | 2021-06-01 | 江苏爱特恩高分子材料有限公司 | Method for preparing high-dispersion titanium dioxide by recycling alkali-reduced wastewater |
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| Title |
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| 王淑影;杨俞;闫龙;: "碱减量废水的处理现状" * |
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Application publication date: 20221014 |