CN117800936A - Extraction process of phthalic anhydride in wastewater - Google Patents
Extraction process of phthalic anhydride in wastewater Download PDFInfo
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- CN117800936A CN117800936A CN202311807134.XA CN202311807134A CN117800936A CN 117800936 A CN117800936 A CN 117800936A CN 202311807134 A CN202311807134 A CN 202311807134A CN 117800936 A CN117800936 A CN 117800936A
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- China
- Prior art keywords
- phthalic anhydride
- pumping
- wastewater
- water
- filter press
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002351 wastewater Substances 0.000 title claims abstract description 38
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 title claims abstract description 32
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000605 extraction Methods 0.000 title claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 19
- 238000004064 recycling Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000005086 pumping Methods 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 27
- 239000011259 mixed solution Substances 0.000 claims description 26
- 229910052799 carbon Inorganic materials 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 210000003298 dental enamel Anatomy 0.000 claims description 8
- 238000007865 diluting Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims 3
- 239000000463 material Substances 0.000 abstract description 4
- 238000000053 physical method Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 2
- 239000000284 extract Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 5
- 239000002920 hazardous waste Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- -1 cyclic anhydride Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000010919 dye waste Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D307/87—Benzo [c] furans; Hydrogenated benzo [c] furans
- C07D307/89—Benzo [c] furans; Hydrogenated benzo [c] furans with two oxygen atoms directly attached in positions 1 and 3
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention belongs to the technical field of wastewater purification and recycling, and particularly relates to an extraction process of phthalic anhydride in wastewater. The invention extracts the phthalic anhydride from the waste water by using a physical method, and the phthalic anhydride is reused in production, so that the consumption of raw and auxiliary materials is greatly reduced, the cost is reduced, and meanwhile, the waste water is subjected to extraction of the phthalic anhydride, so that the impurity in the waste water is less, the treatment is easier, and the time of environmental protection treatment is shortened.
Description
Technical Field
The invention relates to the technical field of wastewater purification and recycling, in particular to an extraction process of phthalic anhydride in wastewater.
Background
Phthalic anhydride, abbreviated as phthalic anhydride, is a cyclic anhydride formed by intramolecular dehydration of phthalic acid. Phthalic anhydride is a white solid, is an important raw material in chemical industry, and is particularly used for manufacturing plasticizers.
Energy conservation and environmental protection are two important concerns in the world today, and therefore, efficient, new, green, environmental protection products have become one of the key directions of research by scientists in various countries. The waste water in dye industry is widely accepted industrial waste water which is difficult to treat because the catalyst in the dye waste water does not participate in the reaction, the catalyst is all in the waste water after the reaction is finished, the ratio of the catalyst in the waste water reaches 50000 PPM, and the waste water contains excessive raw materials which are easy to sublimate. Therefore, the waste water has a plurality of impurities and is difficult to treat. And if the phthalic anhydride is extracted from seawater or boron ore, the extraction technology is complex, the pollution is large, and the phthalic anhydride is not renewable.
The existing dye wastewater treatment method simply uses phthalic anhydride as hazardous waste treatment after being adsorbed by active carbon, and the wastewater is subjected to biochemical treatment, so that the environment-friendly treatment has the defects of high difficulty, high raw material consumption and the like. For the related art problems, no solution has been proposed yet.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides the extraction process of phthalic anhydride in the wastewater, which aims to overcome the technical problems in the prior art, and the invention aims to extract phthalic anhydride from the wastewater by using a physical method, recycle the phthalic anhydride in the production, greatly save the consumption of raw and auxiliary materials, and simultaneously, the wastewater is less in impurity and easier to treat after the phthalic anhydride is extracted.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water;
step five: pumping the solution containing the activated carbon at 50 ℃ in the fourth step into a filter press to remove the activated carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
Preferably, in the fourth step, the mixed solution and the activated carbon are stirred for 2-4 min.
Preferably, in the third step, the temperature is heated to 95-105 ℃, the temperature is kept for 26-35 min, and finally the temperature is reduced to 45-55 ℃.
Preferably, in the fourth step, 3%o of active carbon is added into the mixed solution.
Compared with the prior art, the invention has the beneficial effects that:
the invention is an extraction process of phthalic anhydride in waste water, which only needs a physical method, has simple and safe operation, does not add other chemicals or new pollutants, and fully recycles the extracted raw materials and auxiliary materials, so the invention has the advantages of simple industry, low energy consumption and low cost, the prepared phthalic anhydride has high purity, the dangerous waste amount is reduced, and the reduced dangerous waste is fully extracted for production.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling; heating to 96 ℃, preserving heat for 30min, and finally cooling to 45 ℃;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water; stirring the mixed solution and activated carbon for 2min;
step five: pumping the solution containing 3 per mill of active carbon at 50 ℃ in the fourth step into a filter press to remove the active carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
Example 2
The invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling; heating to 105 ℃, preserving heat for 32min, and finally cooling to 51 ℃;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water; stirring the mixed solution and activated carbon for 3min;
step five: pumping the solution containing 3 per mill of active carbon at 50 ℃ in the fourth step into a filter press to remove the active carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
Example 3
The invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling; heating to 96 ℃, preserving heat for 29min, and finally cooling to 49 ℃;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water; stirring the mixed solution and the activated carbon for 2-4 min;
step five: pumping the solution containing 3 per mill of active carbon at 50 ℃ in the fourth step into a filter press to remove the active carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
Example 4
The invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling; heating to 102 ℃, preserving heat for 31min, and finally cooling to 47 ℃;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water; stirring the mixed solution and activated carbon for 2min;
step five: pumping the solution containing 3 per mill of active carbon at 50 ℃ in the fourth step into a filter press to remove the active carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
Example 5
The invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling; heating to 101 ℃, preserving heat for 34min, and finally cooling to 52 ℃;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water; stirring the mixed solution and activated carbon for 3min;
step five: pumping the solution containing 3 per mill of active carbon at 50 ℃ in the fourth step into a filter press to remove the active carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
Example 6
The invention provides an extraction process of phthalic anhydride in wastewater, which comprises the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling; heating to 100deg.C, maintaining the temperature for 32min, and cooling to 50deg.C;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water; stirring the mixed solution and activated carbon for 3min;
step five: pumping the solution containing 3 per mill of active carbon at 50 ℃ in the fourth step into a filter press to remove the active carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
The amounts of phthalic anhydride extracted and the amount of hazardous waste reduced in examples 1 to 6 are shown in Table 1.
TABLE 1
The invention only needs a physical method, has simple and safe operation, does not increase other chemicals and new pollutants, and the extracted raw materials and auxiliary materials are all recycled, so the invention has simple industry, less energy consumption and low cost, the prepared phthalic anhydride has high purity, the hazardous waste amount is reduced, and the reduced hazardous waste is all extracted for production.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The extraction process of phthalic anhydride in wastewater is characterized by comprising the following steps:
step one: pumping dye wastewater containing 19% sulfuric acid at high temperature into an enamel kettle, and cooling to 40 ℃;
step two: pumping the mixed solution at 40 ℃ in the first step into a filter press;
step three: diluting the solid subjected to filter pressing by the filter press in the second step by 10 times by weight, heating, preserving heat, and finally cooling;
step four: adding the mixed solution into active carbon, and stirring to remove impurities in water;
step five: pumping the solution containing the activated carbon at 50 ℃ in the fourth step into a filter press to remove the activated carbon containing impurities;
step six: then continuously cooling the water solution to 30 ℃, pumping the water solution into a filter press, and removing the water after filter pressing to a production device for recycling;
step seven: and (3) the solid after press filtration enters a drying bed, is dried at 115 ℃ and is packaged for recycling.
2. The process for extracting phthalic anhydride from wastewater according to claim 1, wherein in the fourth step, the mixed solution and activated carbon are stirred for 2-4 min.
3. The process for extracting phthalic anhydride from wastewater according to claim 1, wherein in the third step, the temperature is raised to 95-105 ℃, the temperature is kept for 26-35 min, and the temperature is lowered to 45-55 ℃.
4. The process for extracting phthalic anhydride from wastewater according to claim 1, wherein in the fourth step, 3%o of activated carbon is added to the mixed solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311807134.XA CN117800936A (en) | 2023-12-26 | 2023-12-26 | Extraction process of phthalic anhydride in wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311807134.XA CN117800936A (en) | 2023-12-26 | 2023-12-26 | Extraction process of phthalic anhydride in wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117800936A true CN117800936A (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311807134.XA Pending CN117800936A (en) | 2023-12-26 | 2023-12-26 | Extraction process of phthalic anhydride in wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117800936A (en) |
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2023
- 2023-12-26 CN CN202311807134.XA patent/CN117800936A/en active Pending
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