CN115415290A - Treatment process of waste sea sand cake generated by sea sand for filtering chemical fiber spinning assembly and application of product - Google Patents
Treatment process of waste sea sand cake generated by sea sand for filtering chemical fiber spinning assembly and application of product Download PDFInfo
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- CN115415290A CN115415290A CN202210791061.9A CN202210791061A CN115415290A CN 115415290 A CN115415290 A CN 115415290A CN 202210791061 A CN202210791061 A CN 202210791061A CN 115415290 A CN115415290 A CN 115415290A
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- sea sand
- ethylene glycol
- alkali
- cake
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- 239000004576 sand Substances 0.000 title claims abstract description 87
- 239000002699 waste material Substances 0.000 title claims abstract description 33
- 238000001914 filtration Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000126 substance Substances 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 title claims abstract description 11
- 238000009987 spinning Methods 0.000 title claims abstract description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 128
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- 239000003513 alkali Substances 0.000 claims abstract description 36
- 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 claims abstract description 36
- 239000011259 mixed solution Substances 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 25
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 22
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 239000012295 chemical reaction liquid Substances 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 12
- 239000011780 sodium chloride Substances 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 159000000011 group IA salts Chemical class 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 abstract description 6
- HQWKKEIVHQXCPI-UHFFFAOYSA-L disodium;phthalate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C([O-])=O HQWKKEIVHQXCPI-UHFFFAOYSA-L 0.000 abstract 1
- 239000012528 membrane Substances 0.000 description 3
- 150000001447 alkali salts Chemical class 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a treatment process of waste sea sand cakes generated by sea sand for filtering a chemical fiber spinning assembly, which comprises the following steps: preheating a sea sand cake, preparing a special reaction solution and heating; putting the sea sand cake in a filter basket, lifting the filter basket to a reaction kettle containing a special solution, stirring, and carrying out continuous reaction in a constant-temperature, constant-pressure and constant-current environment to generate a mixed solution of sodium terephthalate, ethylene glycol, alkali and sea sand; hoisting out a filter basket, wherein a damp primary mud cake containing sea sand, sodium terephthalate solid, alkali, glycol and trace impurities is arranged in the filter basket; and (3) drying the primary mud cake by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a secondary mud cake. The invention does not need to calcine the sea sand cake at high temperature, the low-temperature reaction effectively protects the sea sand, and simultaneously reduces the pollution to the environment, and the sodium phthalate and the ethylene glycol in the extract can be used for preparing PET, industrial snow-melting agent and the like, thereby realizing the reutilization, saving the cost and reducing the waste.
Description
Technical Field
The invention relates to the technical field of sea sand treatment, in particular to a treatment process of waste sea sand cakes generated by sea sand for filtering a chemical fiber spinning assembly and application of treated extracts.
Background
In the chemical fiber spinning filtration process, sea sand needs to be added for pressure equalizing, and sea sand contains sea sand, polyester stainless steel filter screen and other impurities, and most of the sea sand is burned at present, so that the environment is polluted on the one hand, and on the other hand, waste is caused, and waste cannot be recycled.
Disclosure of Invention
The invention aims to provide a treatment process of waste sea sand cakes generated by sea sand for filtering a chemical fiber spinning component, and aims to solve the problems that the environment is polluted due to direct incineration of the waste sea sand at present and substances in the waste sea sand cannot be extracted and reused.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment process of waste sea sand cakes generated by sea sand for filtering a chemical fiber spinning assembly comprises the following steps:
the method comprises the following steps: preheating the waste sea sand cake to 140-160 ℃; preparing a special reaction solution, uniformly stirring ethylene glycol, special reaction blending alkali and a catalyst, and heating to 180-210 ℃;
step two: putting the sea sand cake into a metal film filter basket, wherein the aperture of the filter basket is made according to the mesh number of the sea sand, conveying the waste sea sand cake into a reaction kettle containing special reaction liquid through the filter basket, homogenizing and stirring the reaction liquid in the reaction kettle through a homogenizing pump, and carrying out continuous reaction in a constant-temperature, constant-pressure and constant-current environment to generate a mixed solution containing sodium terephthalate, alkali, sea sand, the reaction liquid, glycol and a catalyst, wherein the sodium terephthalate, the alkali and the sea sand can be separated out through the filter basket;
step three: lifting a filter basket, wherein sea sand and a wet primary mud cake containing sodium terephthalate solid, alkali, ethylene glycol and trace impurities are filled in the filter basket, residual liquid of ethylene glycol and sodium terephthalate powder is remained in a reaction kettle, and residual liquid is subjected to pressurization and rapid cooling through a metal film filter basket so as to filter the residual liquid in the reaction kettle to remove the sodium terephthalate powder, separate out a special reaction liquid, a special cleaning liquid and an ethylene glycol liquid, and recycle the special reaction liquid, the special cleaning liquid and the ethylene glycol liquid; the sea sand and the mixture in the filter basket are flushed by using the glycol and then are conveyed into the metal film filter basket for recycling;
step four: drying the primary mud cake by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried secondary mud cake containing sodium terephthalate solid, alkali and trace impurities; drying the sea sand generated in the third step by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried mud cake containing sodium terephthalate, alkali and trace impurities;
preferably, the base special for reaction preparation is an alkaline salt.
Preferably, the constant temperature in the second step is 180-220 ℃, and the constant pressure is 2 kg.
The invention also provides application of the sodium terephthalate and the ethylene glycol obtained by the waste sea sand cake treatment process to the preparation of PET and industrial snow-melting agents.
Preferably, the method is used for manufacturing the PET and industrial snow melting agent, and comprises the following steps:
the method comprises the following steps: reacting the extracted dried mud cake with sodium terephthalate with hydrochloric acid to generate mixed solution of terephthalic acid, sodium chloride and hydrochloric acid;
step two: filtering the mixed solution by using a special filter to separate out terephthalic acid powder, and reacting ethylene glycol with terephthalic acid to obtain PET;
step three: and D, cooling the residual liquid of the sodium chloride and the hydrochloric acid obtained in the step two to separate out the sodium chloride which is used as an industrial snow-melting agent, and recycling the residual solution.
Compared with the prior art, the invention has the beneficial effects that:
through a series of reactions and filtration, sodium terephthalate can be obtained from sea sand, ethylene glycol is separated out from the mixed solution, a sea sand cake does not need to be calcined at high temperature, the sea sand is effectively protected through low-temperature reactions, meanwhile, the pollution to the environment is reduced, the effective treatment of the sea sand is realized, and the pollution to the environment is reduced.
Sodium terephthalate reacts with hydrochloric acid to produce sodium chloride and terephthalic acid, the terephthalic acid reacts with ethylene glycol to generate PET, the sodium chloride can be used as an industrial snow-melting agent and the like, the recycling of the extract is realized, the cost is saved, and the waste is reduced.
Drawings
FIG. 1 is a flow chart of the process for treating and extracting the waste sea sand according to the present invention;
FIG. 2 is a flow chart of the application process of the extract.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
referring to fig. 1, a process for treating waste sea sand cake generated by sea sand for filtering in a chemical fiber spinning assembly includes the following steps:
the method comprises the following steps: preheating waste sea sand to 140 ℃; preparing a special reaction solution, uniformly stirring ethylene glycol, special reaction blending alkali and a catalyst, heating to 180 ℃, wherein the special reaction blending alkali is an alkali salt;
step two: conveying the waste sea sand into a reaction kettle, circularly conveying the special reaction solution into the reaction kettle at a constant flow rate, stirring, and continuously reacting in an environment with the temperature of 170 ℃ and the pressure of 2 kilograms to generate a mixed solution containing sodium terephthalate, alkali, sea sand, a reaction solution and a catalyst;
step three: keeping the temperature of the mixed solution at 180 ℃, and filtering alkali and sea sand in the mixed solution by using a metal film filter to separate out sea sand and a damp primary mud cake with sodium terephthalate solid, alkali and trace impurities;
step four: drying the primary mud cake by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried secondary mud cake containing sodium terephthalate solid, alkali and trace impurities; drying the sea sand generated in the third step by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried mud cake containing sodium terephthalate, alkali and trace impurities;
step five: quickly cooling the mixed liquid generated after filtering in the third step, filtering by using a high-precision filtering device, and separating out special reaction liquid, special cleaning liquid and glycol liquid for recycling; and (4) flushing the sea sand and the mixture in the filtering device by using the ethylene glycol, and conveying the sea sand and the mixture into the metal membrane filter for recycling.
Example 2:
referring to fig. 1, a process for treating waste sea sand cakes generated by sea sand for filtering chemical fiber spinning assemblies includes the following steps:
the method comprises the following steps: preheating waste sea sand to 150 ℃; preparing a special reaction solution, uniformly stirring ethylene glycol, special reaction blending alkali and a catalyst, heating to 195 ℃, wherein the special reaction blending alkali is an alkali salt;
step two: conveying the waste sea sand into a reaction kettle, circularly conveying the special reaction solution into the reaction kettle at a constant flow rate, stirring, and continuously reacting in an environment with the temperature of 200 ℃ and the pressure of 2 kilograms to generate a mixed solution containing sodium terephthalate, alkali, sea sand, a reaction solution and a catalyst;
step three: keeping the temperature of the mixed solution at 200 ℃, and filtering alkali and sea sand in the mixed solution by using a metal film filter to separate out sea sand and a damp primary mud cake with sodium terephthalate solid, alkali and trace impurities;
step four: drying the primary mud cake by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried secondary mud cake containing sodium terephthalate solid, alkali and trace impurities; drying the sea sand generated in the third step by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried mud cake containing sodium terephthalate, alkali and trace impurities;
step five: quickly cooling the mixed liquid generated after filtering in the third step, filtering by using a high-precision filtering device, and separating out special reaction liquid, special cleaning liquid and glycol liquid for recycling; and (4) washing the sea sand and the mixture in the filtering device by using the ethylene glycol, and conveying the sea sand and the mixture into the metal membrane filter for recycling.
Example 3
Referring to fig. 1, a process for treating waste sea sand cakes generated by sea sand for filtering chemical fiber spinning assemblies includes the following steps:
the method comprises the following steps: preheating waste sea sand to 160 ℃; preparing a special reaction solution, uniformly stirring ethylene glycol, special reaction blending alkali and a catalyst, heating to 210 ℃, wherein the special reaction blending alkali is an alkaline salt;
step two: conveying the waste sea sand into a reaction kettle, circularly conveying the special reaction solution into the reaction kettle at a constant flow rate, stirring, and continuously reacting in an environment with the temperature of 220 ℃ and the pressure of 2 kilograms to generate a mixed solution containing sodium terephthalate, alkali, sea sand, a reaction solution and a catalyst;
step three: the temperature of the mixed solution is kept at 220 ℃, and alkali and sea sand in the mixed solution are filtered by using a metal film filter to separate out sea sand and a damp primary mud cake containing sodium terephthalate solid, alkali and trace impurities;
step four: drying the primary mud cake by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried secondary mud cake containing sodium terephthalate solid, alkali and trace impurities; drying the sea sand generated in the third step by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried mud cake containing sodium terephthalate, alkali and trace impurities;
step five: quickly cooling the mixed solution generated after filtering in the third step, filtering by using a high-precision filtering device, and separating out reaction special liquid, cleaning special liquid and glycol liquid for recycling; and (4) flushing the sea sand and the mixture in the filtering device by using the ethylene glycol, and conveying the sea sand and the mixture into the metal membrane filter for recycling.
The invention also provides application of the extract in waste sea sand treatment.
Preferably, the waste sea sand processing extract is sodium terephthalate and ethylene glycol, can be used for preparing PET and industrial snow melting agent, and comprises the following steps:
the method comprises the following steps: reacting the extracted dried mud cake with sodium terephthalate with hydrochloric acid to generate mixed solution of terephthalic acid, sodium chloride and hydrochloric acid;
step two: filtering the mixed solution by using a special filter to separate out terephthalic acid powder, and reacting ethylene glycol with terephthalic acid to obtain PET;
step three: and D, cooling the residual liquid of the sodium chloride and the hydrochloric acid obtained in the step two to separate out the sodium chloride which is used as an industrial snow-melting agent, and recycling the residual solution.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
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 person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (6)
1. A treatment process of waste sea sand cakes generated by sea sand for filtering a chemical fiber spinning assembly is characterized by comprising the following steps:
the method comprises the following steps: preheating the waste sea sand cake to 140-160 ℃; preparing a special reaction solution, uniformly stirring ethylene glycol, special reaction blending alkali and a catalyst, and heating to 180-210 ℃;
step two: putting the sea sand cake into a metal film filter basket, conveying the waste sea sand cake into a reaction kettle containing special reaction liquid through the filter basket, homogenizing and stirring the reaction liquid in the reaction kettle through a homogenizing pump, and carrying out continuous reaction in a constant-temperature, constant-pressure and constant-current environment to generate a mixed solution containing sodium terephthalate, alkali, sea sand, the reaction liquid, glycol and a catalyst, wherein the sodium terephthalate, the alkali and the sea sand can be separated out through the filter basket;
step three: lifting a filter basket, wherein sea sand and a wet primary mud cake containing sodium terephthalate solid, alkali, ethylene glycol and trace impurities are filled in the filter basket, residual liquid of ethylene glycol and sodium terephthalate powder is remained in the reaction kettle, and the residual liquid is subjected to pressurization and rapid cooling through the metal film filter basket so as to filter the residual liquid in the reaction kettle to remove the sodium terephthalate powder, separate out a special reaction liquid, a special cleaning liquid and an ethylene glycol liquid and recycle the special reaction liquid and the ethylene glycol liquid; the sea sand and the mixture in the filter basket are flushed by using the ethylene glycol and then conveyed into the metal film filter basket for recycling;
step four: drying the primary mud cake by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried secondary mud cake containing sodium terephthalate solid, alkali and trace impurities; and (3) drying the sea sand generated in the third step by using a closed oven, condensing and recovering ethylene glycol, and simultaneously obtaining a dried mud cake containing sodium terephthalate, alkali and trace impurities.
2. The process for treating a waste sea sand cake as claimed in claim 1, wherein: the special alkali for reaction blending is alkaline salt.
3. The process for treating a waste sea sand cake as claimed in claim 1, wherein: the aperture of the metal film filtering basket is manufactured according to the mesh number of sea sand.
4. The process for treating a waste sea sand cake as claimed in claim 1, wherein: the constant temperature in the second step is 180-220 ℃, and the constant pressure is 2 kilograms of pressure.
5. Use of sodium terephthalate and ethylene glycol obtained by the process for the treatment of spent sea sand cakes according to any one of claims 1 to 4, for the manufacture of PET and industrial snow-melting agents.
6. Use according to claim 5, characterized in that the steps are as follows:
the method comprises the following steps: reacting the extracted dried mud cake with sodium terephthalate with hydrochloric acid to generate mixed solution of terephthalic acid, sodium chloride and hydrochloric acid;
step two: filtering the mixed solution by using a special filter to separate out terephthalic acid powder, and reacting ethylene glycol with terephthalic acid to obtain PET;
step three: and D, cooling the residual liquid of the sodium chloride and the hydrochloric acid obtained in the step two to separate out the sodium chloride which is used as an industrial snow-melting agent, and recycling the residual solution.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210791061.9A CN115415290B (en) | 2022-07-05 | 2022-07-05 | Treatment process of waste sea sand cake generated by sea sand for filtering chemical fiber spinning assembly and application of product of treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210791061.9A CN115415290B (en) | 2022-07-05 | 2022-07-05 | Treatment process of waste sea sand cake generated by sea sand for filtering chemical fiber spinning assembly and application of product of treatment process |
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| CN115415290A true CN115415290A (en) | 2022-12-02 |
| CN115415290B CN115415290B (en) | 2024-05-03 |
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| CN114181037A (en) * | 2021-12-14 | 2022-03-15 | 石泰山 | Method for producing sodium acetate by PET polyester alkali depolymerization |
-
2022
- 2022-07-05 CN CN202210791061.9A patent/CN115415290B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW591049B (en) * | 2001-10-16 | 2004-06-11 | Teijin Ltd | Method for recycling PET bottle |
| CN101531581A (en) * | 2008-03-13 | 2009-09-16 | 徐晶 | Regenerative method of PET wastes |
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| CN108531922A (en) * | 2018-04-18 | 2018-09-14 | 宁波天源科技有限公司 | A kind of synthetic fiber spinning board cleaning agent and cleaning method |
| RU2754972C1 (en) * | 2020-09-24 | 2021-09-08 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Российский химико-технологический университет имени Д.И. Менделеева" (РХТУ им. Д.И. Менделеева) | Method for processing polyethylene terephthalate waste |
| CN114181037A (en) * | 2021-12-14 | 2022-03-15 | 石泰山 | Method for producing sodium acetate by PET polyester alkali depolymerization |
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