CN114804280A - Method for recovering acid, thioxanthone and derivatives thereof from waste acid - Google Patents
Method for recovering acid, thioxanthone and derivatives thereof from waste acid Download PDFInfo
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- CN114804280A CN114804280A CN202210589471.5A CN202210589471A CN114804280A CN 114804280 A CN114804280 A CN 114804280A CN 202210589471 A CN202210589471 A CN 202210589471A CN 114804280 A CN114804280 A CN 114804280A
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- thioxanthone
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- acid
- waste acid
- resin
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- 239000002253 acid Substances 0.000 title claims abstract description 66
- 239000002699 waste material Substances 0.000 title claims abstract description 52
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 59
- 229920005989 resin Polymers 0.000 claims abstract description 59
- 238000001179 sorption measurement Methods 0.000 claims abstract description 54
- 239000003480 eluent Substances 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 7
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000008367 deionised water Substances 0.000 claims abstract description 3
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 3
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000000746 purification Methods 0.000 claims abstract description 3
- 238000004064 recycling Methods 0.000 claims abstract description 3
- 230000001172 regenerating effect Effects 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000003463 adsorbent Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 9
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
- 125000003277 amino group Chemical group 0.000 claims description 6
- 150000007513 acids Chemical class 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 239000002585 base Substances 0.000 claims description 2
- NKDDWNXOKDWJAK-UHFFFAOYSA-N dimethoxymethane Chemical compound COCOC NKDDWNXOKDWJAK-UHFFFAOYSA-N 0.000 claims description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 239000002798 polar solvent Substances 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241001597008 Nomeidae Species 0.000 description 1
- 241001428357 Trapa japonica Species 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012024 dehydrating agents Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000002351 wastewater Substances 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a method for recovering acid, thioxanthone and derivatives thereof from waste acid, which comprises the following steps: s001, soaking the macroporous adsorption resin in alkali liquor, and washing the macroporous adsorption resin with deionized water to be neutral; s002, filling macroporous adsorption resin into an adsorption column, allowing the waste acid to pass through the adsorption column, adsorbing thioxanthone and derivatives thereof in the waste acid on the adsorption resin by using the adsorption resin, and changing the waste acid from brownish red into colorless and transparent after adsorption and purification; step S003, eluting and regenerating the resin saturated by adsorption by using an eluent to obtain an eluent; and step S004, evaporating and concentrating the eluent to obtain solid thioxanthone and derivatives thereof, and recycling the evaporated liquid.
Description
Technical Field
The invention belongs to the technical field of production of printing coating additives, and particularly relates to a method for recovering acid, thioxanthone and derivatives thereof from waste acid.
Background
Thioxanthone and its derivant are a high-efficient free radical II type photoinitiator, used for UV curing reaction of unsaturated resin, generally apply to fields such as the printing ink of the lithographic plate, flexible printing ink, silk screen printing ink, electronic product, coating, etc., this kind of initiator is because it is longer to absorb wavelength, the photoinitiation is high in efficiency, its potential application is increasing continuously, become the hot product on the market at present.
98% concentrated sulfuric acid or fuming sulfuric acid is used as a dehydrating agent in the production process of thioxanthone and derivatives thereof, and after the reaction is finished, a large amount of high-concentration waste sulfuric acid is generated, and the waste sulfuric acid contains more valuable organic matters, including thioxanthone and sulfonated products thereof. Meanwhile, the generated waste sulfuric acid has high acidity, deep color and large COD (chemical oxygen demand), and how to effectively treat the waste sulfuric acid becomes a difficult problem in the industry. At present, the common disposal method of the waste acid comprises the following steps:
a) salt formation method: the production of ordinary calcium or ammonium sulfate has high requirements on organic matter components and content in waste acid, and the method is difficult to be directly adopted.
b) An oxidation method: the waste acid is added with an oxidant to oxidize and decompose organic matters, the common oxidant is potassium permanganate, hydrogen peroxide and the like, but the oxidation method has the common problems that the oxidation efficiency is not high, organic molecules and the like formed after oxidation still remain in the waste acid, and the cost is high.
C) The pyrolysis method has extremely high requirements on equipment, huge energy consumption, higher investment cost and operation cost and no good economic benefit.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a process for recovering acids and thioxanthones and derivatives thereof from waste sulphuric acid, which overcomes the above problems or at least partially solves or alleviates the above problems.
A method for recovering acid and thioxanthone and derivatives thereof from waste acid, comprising the steps of:
s001, soaking the macroporous adsorption resin in alkali liquor, and washing the macroporous adsorption resin with deionized water to be neutral;
s002, filling macroporous adsorption resin into an adsorption column, allowing the waste acid to pass through the adsorption column, adsorbing thioxanthone and derivatives thereof in the waste acid on the adsorption resin by using the adsorption resin, and changing the waste acid from brownish red into colorless and transparent after adsorption and purification;
step S003, eluting and regenerating the resin adsorbed with the thioxanthone and the derivatives thereof by using an eluent to obtain an eluent;
and step S004, evaporating and concentrating the eluent to obtain solid thioxanthone and derivatives thereof, and recycling the evaporated liquid.
In step S001, the macroporous adsorption resin is soaked in alkali liquor for 3-10h at 10-100 ℃, and the alkali liquor is sodium hydroxide aqueous solution.
In the step S001, the soaking temperature of the macroporous adsorption resin in the alkali liquor is 40-85 ℃, the soaking time is 4-8 h, and the mass fraction of the sodium hydroxide aqueous solution is 4-10%.
In step S001 and step S002, the skeleton of the macroporous adsorbent resin is polystyrene, the surface of the macroporous adsorbent resin is nonpolar or weakly polar, preferably, the surface of the macroporous adsorbent resin has a certain amount of amino groups, the amino groups are R-NH2, wherein the R groups are one or more of methyl, ethyl, phenyl and triazine rings, and the amino group content is 0.1-0.5 mmol/g.
In the steps S001 and S002, the specific surface area of the macroporous adsorption resin is 400-1200m 2 The average pore diameter of the solution is 2-100nm, preferably, the specific surface area of the macroporous adsorbent resin is 500-800m 2 (iv)/g, having an average pore diameter of 5 to 50 nm;
in step S002, the waste acid is high-concentration waste acid generated in the production process of thioxanthone and derivatives thereof, the acid concentration is 30% -60%, and the chemical oxygen demand is 20000-50000 mg/L.
In the step S002, the waste acid passes through an adsorption column at the temperature of 5-40 ℃ and the flow rate of 0.5-10 BV/h.
In step S003, the eluent is used in an amount of 100-300% by volume based on the resin.
In step S003, the eluent is an aqueous solution of a base or a polar solvent.
In step S003, the eluent is one or more of acetonitrile, acetone, methylal, methanol, and ethanol.
The method can reduce the chemical oxygen demand from 30000-50000mg/L to below 200mg/L after resin adsorption treatment, change the appearance from reddish brown to colorless transparent, can further recycle resources, and can effectively recycle the thioxanthone and the derivatives thereof with economic value in the waste acid.
The present invention will be described in further detail with reference to examples.
Detailed Description
The following experimental examples are only for illustrating the process of the present invention, but are not intended to limit the scope of the present invention.
Commercially available macroporous adsorbent resins commonly used include XDA-2, XDA-5, XDA-8, HP-20, HP-30, HP-50, etc., of Trapa japonica, Rohm and Hashima, domestic H101, XDA-200, etc., and antioxidant macroporous adsorbent resins include HA-185, HA-320, of West Asian. The oxidation-resistant macroadsorption resin can adopt at least one or more of HA-185 and HA-320.
The macroporous adsorption resin has high porosity and large pore diameter inside. The macroporous adsorption resin has stable physicochemical properties, is insoluble in acid, alkali and organic solvents, has good selectivity to organic matters, is not influenced by the existence of inorganic salts and strong ion low molecular compounds, and can selectively adsorb organic matters from a solution through physical adsorption. The adsorbed organic matters can be eluted by using a certain amount of eluent, and the regenerated resin recovers the adsorption capacity, can be repeatedly recycled and has good economic use value.
However, the macroporous adsorption resin HAs various types, and the specific surface area, pore size and surface polarity or the type with functional groups have great influence on the adsorption selectivity and saturated adsorption capacity of organic matters, so that the selection of the resin with good oxidation resistance, large saturated adsorption capacity and easy elution is difficult, and HA-185 and HA-320 have proper specific surface area and pore size, have a small amount of amino groups on the surface, have physical adsorption and hydrogen bond adsorption, and have excellent adsorption selectivity and saturated adsorption capacity on thioxanthone and derivatives thereof.
The following is a description by way of example
Example 1
300ml of XDA-5 (specific surface area 415 m) was added at 60 ℃ 2 The macroporous absorption resin is soaked for 5 hours by 8 percent of sodium hydroxide aqueous solution, the soaked absorption resin is washed to be neutral by distilled water and is loaded into a jacket glass absorption column (phi 25 multiplied by 300mm), circulating water passes through the jacket to ensure that the column temperature is 25 ℃, then the waste acid solution passes through the resin column at the flow rate of 300ml/h (1BV/h), 1200ml of waste acid is treated in a single batch, the appearance of the original waste acid is reddish brown, the acidity is 40 percent, the COD is 36000mg/L, the treated waste acid is light yellow, the COD (chemical oxygen consumption) with the acidity of 39 percent is 900mg/L, and the removal rate of CODcr (dichromate oxidation or dichromate oxygen demand) is as follows: 97.5 percent.
Eluting with 75% methanol solution at 50 deg.C and flow rate of 300ml/h (1BV/h) through resin column, consuming 600ml methanol solution in a single batch, vacuum concentrating eluate, and recovering 540ml methanol to obtain total 14.04g solid thioxanthone and its derivatives.
Example 2
300ml of XDA-200 (specific surface area 1100 m) was placed at 60 ℃ 2 The average pore diameter of the soaked resin is 2.5nm, the nonpolar) macroporous adsorption resin is soaked for 5 hours by using 8 percent of sodium hydroxide aqueous solution, the soaked adsorption resin is washed to be neutral by using distilled water and is loaded into a jacket glass adsorption column (phi 25 multiplied by 300mm), circulating water is passed through a jacket to ensure that the column temperature is 25 ℃, then the waste acid solution is passed through a resin column at the flow rate of 300ml/h (1BV/h), 900ml of waste acid is treated in a single batch, the appearance of the original waste acid is reddish brown, the acidity is 38 percent, the COD is 42000mg/L, the treated waste acid is light brown, the acidity is 36 percent, the COD is 1800mg/L, and the CODcr removal rate is as follows: 95.71 percent
Eluting with 75% ethanol solution at 60 deg.C and flow rate of 300ml/h (1BV/h) through resin column, consuming 900ml ethanol solution in single batch, vacuum concentrating eluate, and recovering ethanol to obtain total volume of 810ml, to obtain solid thioxanthone and its derivatives about 12.06 g.
Example 3
300ml of HA-185 (specific surface area 800 m) was added at 60 deg.C 2 Soaking macroporous adsorption resin with the average pore diameter of 12nm and the amino content of 0.2mmol/g) in 8 percent sodium hydroxide aqueous solution for 6 hours, washing the soaked adsorption resin to be neutral by using distilled water, filling the washed adsorption resin into a jacket glass adsorption column (phi 25 multiplied by 300mm), passing circulating water through the jacket to ensure that the column temperature is 25 ℃, then passing the waste acid solution through a resin column at the flow rate of 300ml/h (1BV/h), treating 1200ml of waste acid in a single batch, wherein the appearance of the original waste acid is reddish brown, the acidity is 50 percent, the COD is 40000mg/L, the treated waste acid is colorless and transparent, the acidity is 49 percent of COD is 68mg/L, and the removal rate of CODcr is as follows: 99.83 percent.
And (2) passing a 6% sodium hydroxide solution by mass through a resin column at a temperature of 40 ℃ and a flow rate of 300ml/h (1BV/h), eluting, wherein 600ml of the sodium hydroxide solution is consumed in a single batch, and the eluent is concentrated in vacuum to recover 540ml of water, so that about 16.2g of thioxanthone solid is obtained.
Example 4
XDA-8 (specific surface area 140 m) was heated at 25 ℃ to 2 Perg, average pore diameter of 25nm and strong polarity) adsorbent resin is soaked for 5h by 8 percent sodium hydroxide aqueous solution, the other conditions are the same as the example 3, the COD of the treated wastewater is 5500mg/L, and the CODcr removal rate is as follows: 86.9% yield thioxanthone solid, about 13.8 g.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (10)
1. A method for recovering acid, thioxanthone and derivatives thereof from waste acid is characterized by comprising the following steps:
s001, soaking the macroporous adsorption resin in alkali liquor, and washing the macroporous adsorption resin with deionized water to be neutral;
s002, filling macroporous adsorption resin into an adsorption column, allowing the waste acid to pass through the adsorption column, adsorbing thioxanthone and derivatives thereof in the waste acid on the adsorption resin by using the adsorption resin, and changing the waste acid from brownish red into colorless and transparent after adsorption and purification;
step S003, eluting and regenerating the resin adsorbed with the thioxanthone and the derivatives thereof by using an eluent to obtain an eluent;
and step S004, evaporating and concentrating the eluent to obtain solid thioxanthone and derivatives thereof, and recycling the evaporated liquid.
2. The method for recovering acid and thioxanthone and derivatives thereof from waste acid according to claim 1, wherein, in step S001, the soaking temperature of the macroporous adsorption resin in the alkali liquor is 10-100 ℃, the soaking time is 3-10h, and the alkali liquor is sodium hydroxide aqueous solution.
3. The method for recovering acid, thioxanthone and derivatives thereof from waste acid according to claim 2, characterized in that, in step S001, the soaking temperature of the macroporous adsorption resin in the alkali liquor is 40-85 ℃, the soaking time is 4-8 h, and the mass fraction of the sodium hydroxide aqueous solution is 4% -10%.
4. The method for recovering acid and thioxanthone and derivatives thereof from waste acid according to claim 1, wherein in step S001 and step S002, the macroporous adsorbent resin has polystyrene as a framework and the surface of the macroporous adsorbent resin is non-polar or weakly polar.
5. The method for recovering acid and thioxanthone and derivatives thereof from waste acid according to claim 4, wherein the specific surface area of the macroporous adsorbent resin is 500-1000m in steps S001 and S002 2 (ii)/g, having an average pore diameter of 2-100 nm; the surface of the macroporous adsorption resin is provided with a small amount of amino groups, the amino groups are R-NH2, wherein the R groups are one or more of methyl, ethyl, phenyl and triazine rings, and the macroporous adsorption resin is prepared by the following stepsThe amino content is 0.1-0.5 mmol/g.
6. The method for recovering acid, thioxanthone and derivatives thereof from waste acid according to claim 1, wherein in step S002, the waste acid is high-concentration waste acid generated in a production process of thioxanthone and derivatives thereof, the acid concentration is 30% -60%, and the chemical oxygen demand is 20000-50000 mg/L.
7. The method for recovering acid and thioxanthone and derivatives thereof from waste acid according to claim 1, wherein in step S002, the waste acid is passed through an adsorption column at 5-40 ℃ and a flow rate of 0.5-10 BV/h.
8. A method for recovering acids and thioxanthone and its derivatives from waste acids according to claim 1, characterized in that in step S003, the eluent is used in an amount of 100-300% by volume of the resin.
9. A method for recovering acids and thioxanthone and its derivatives from waste acids according to claim 1, characterized in that in step S003, the eluent is an aqueous solution of a base or a polar solvent.
10. A method for recovering acid and thioxanthone and its derivatives from waste acid according to claim 8, characterized in that, in step S003, the eluent is one or more of acetonitrile, acetone, methylal, methanol and ethanol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210589471.5A CN114804280A (en) | 2022-05-26 | 2022-05-26 | Method for recovering acid, thioxanthone and derivatives thereof from waste acid |
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| CN202210589471.5A CN114804280A (en) | 2022-05-26 | 2022-05-26 | Method for recovering acid, thioxanthone and derivatives thereof from waste acid |
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2022
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