CN114539187A - Method for treating biochemical wastewater in production of electronic-grade epoxy resin - Google Patents
Method for treating biochemical wastewater in production of electronic-grade epoxy resin Download PDFInfo
- Publication number
- CN114539187A CN114539187A CN202011340809.0A CN202011340809A CN114539187A CN 114539187 A CN114539187 A CN 114539187A CN 202011340809 A CN202011340809 A CN 202011340809A CN 114539187 A CN114539187 A CN 114539187A
- Authority
- CN
- China
- Prior art keywords
- biochemical wastewater
- epoxy resin
- tower
- electronic
- production
- 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.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/36—Use of additives, e.g. for stabilisation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/08—Compounds containing oxirane rings with hydrocarbon radicals, substituted by halogen atoms, nitro radicals or nitroso radicals
Abstract
The invention belongs to the technical field of water treatment, and relates to a method for treating biochemical wastewater in the production of electronic-grade epoxy resin. And (2) carrying out negative pressure rectification on the biochemical wastewater, introducing carbon dioxide gas into a tower kettle of a rectification tower while rectifying, maintaining a neutral condition, inhibiting epoxy chloropropane from being hydrolyzed to generate glycerol, condensing and recovering epoxy chloropropane at the tower top, and generating recyclable ECH rectification water at the tower kettle so as to realize zero discharge of the biochemical wastewater. Compared with the prior art, by adopting the technical scheme of the invention, carbon dioxide gas is introduced into the tower kettle of the rectifying tower while the biochemical wastewater generated in the production of the electronic grade epoxy resin is rectified, the neutral condition is kept, the hydrolysis of epoxy chloropropane to generate glycerol is inhibited, the epoxy chloropropane is condensed and recovered at the tower top, and the recovery rate of the epoxy chloropropane is more than 99 percent; the content of epoxy chloropropane in ECH rectified water generated in the tower bottom is less than 50ppm, and the ECH rectified water can be reused for the production of electronic-grade epoxy resin, so that zero discharge of biochemical wastewater is realized.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a method for treating biochemical wastewater in the production of electronic-grade epoxy resin.
Background
The epoxy resin has the unique advantages of high insulating property, large structural strength, good sealing property and the like, and is widely applied to insulation and packaging of high-low voltage electric appliances, motors and electronic components. With the rapid development of the epoxy resin industry, the electronic grade epoxy resin pursues large-scale production and clean production, which has become a development trend of the industry.
The key of the large-scale production and the clean production of the electronic grade epoxy resin lies in the wastewater treatment, the production wastewater is divided into high-salinity wastewater and biochemical wastewater (alkalescence, the main pollutant is epichlorohydrin), the existing technology for recycling the high-salinity wastewater after treatment in the chlor-alkali industry is adopted, and the aim of zero discharge of the high-salinity wastewater is realized; but the biochemical wastewater is still treated in an environment-friendly way by using the traditional biochemical technology. Because the COD of the part of the wastewater is high and salt is generated in the biochemical treatment process, the treatment difficulty is high, the cost is high, and the cyclic utilization of water resources cannot be realized; therefore, a way of recycling comprehensive utilization is needed to be found, and biochemical wastewater generated in the production process is recycled and harmless.
Disclosure of Invention
The invention provides a method for treating biochemical wastewater in electronic-grade epoxy resin production, aiming at biochemical wastewater generated in the electronic-grade epoxy resin production.
Specifically, the technical scheme of the invention is that epoxy chloropropane wastewater generated in the production of electronic grade epoxy resin is treated, then epoxy chloropropane is recovered, and the rest ECH distilled water is recycled for the production of epoxy resin, so that zero discharge of biochemical wastewater is realized.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a method for treating biochemical wastewater in electronic-grade epoxy resin production, which comprises the steps of carrying out negative pressure rectification on the biochemical wastewater, introducing carbon dioxide gas into a tower kettle of a rectification tower while rectifying, keeping a neutral condition, inhibiting epoxy chloropropane from being hydrolyzed to generate glycerol, condensing and recovering epoxy chloropropane at the tower top, generating recyclable ECH rectification water at the tower kettle, and realizing zero discharge of the biochemical wastewater.
Further, in one embodiment of the invention, the pH value of the biochemical wastewater is adjusted to 8.0-9.0 before negative pressure rectification.
Further, in an embodiment of the invention, before negative pressure rectification, the biochemical wastewater is subjected to a pH pre-adjusting process, and the specific method comprises the following steps: the biochemical wastewater generated in the production of the electronic-grade epoxy resin is conveyed to a pH adjusting tank through a pump, carbon dioxide gas is introduced into the pH adjusting tank to perform a neutralization reaction with the biochemical wastewater in the tank, and the pH value of the biochemical wastewater is adjusted to 8.0-9.0 by controlling the amount of the introduced carbon dioxide gas.
Further, in one embodiment of the present invention, the rectification column employs
(preferably 25mm) Raschig ring packing is piled up in bulk, and the height of the packing is 5.8-7.2 m. .
Further, in one embodiment of the present invention, the top pressure of the rectifying column is controlled to 18kPa (A) to 30kPa (A), the bottom temperature is controlled to 59 ℃ to 72 ℃, and the carbon dioxide gas introduction amount is 10Nm3/h～50Nm3/h。
Further, in one embodiment of the invention, the mixed gas of epoxy chloropropane, water and carbon dioxide is obtained at the top of the rectifying tower, after the mixed gas is condensed by a condenser, the epoxy chloropropane and the water are condensed and enter a chromatography process, and the epoxy chloropropane is obtained by chromatography recovery; the non-condensable gas carbon dioxide is pressurized by a compressor and then recycled.
Further, in one embodiment of the present invention, the epoxy chloropropane is recovered by chromatography, and the specific method comprises: and (3) condensing the epichlorohydrin and water, then allowing the condensed epichlorohydrin and water to enter a chromatography tank for layering, refluxing the water on the upper layer to a rectifying tower, and recovering the epichlorohydrin on the lower layer to serve as a raw material for producing the electronic-grade epoxy resin.
Further, in one embodiment of the present invention, the ECH distilled water obtained from the column bottom is collected and reused in the refining process of electronic grade epoxy resin production.
Further, in one embodiment of the present invention, during the introduction of the carbon dioxide gas into the bottom of the rectification column, the amount of the introduced carbon dioxide gas is controlled by detecting the pH value of the bottom of the analysis column.
Further, in one embodiment of the invention, the hydrolysis of epichlorohydrin in the rectifying tower is monitored by online detection of chloride ions, so that the generation of glycerol by the hydrolysis of epichlorohydrin is inhibited.
Compared with the prior art, the invention has the advantages that:
while rectifying biochemical wastewater generated in the production of electronic grade epoxy resin, introducing carbon dioxide gas into a tower kettle of a rectifying tower, maintaining a neutral condition, inhibiting the epoxy chloropropane from being hydrolyzed to generate glycerol, condensing and recovering the epoxy chloropropane at the tower top, wherein the recovery rate of the epoxy chloropropane is more than 99 percent; the content of epoxy chloropropane in ECH rectified water generated in the tower bottom is less than 50ppm, and the ECH rectified water can be reused for the production of electronic-grade epoxy resin, so that zero discharge of biochemical wastewater is realized.
Drawings
FIG. 1 is a block diagram of a process flow of the present invention.
Detailed Description
The invention provides a method for treating biochemical wastewater in electronic-grade epoxy resin production, which comprises the steps of carrying out negative pressure rectification on the biochemical wastewater, introducing carbon dioxide gas into a tower kettle of a rectification tower while rectifying, keeping a neutral condition, inhibiting epoxy chloropropane from being hydrolyzed to generate glycerol, condensing and recovering epoxy chloropropane at the tower top, generating recyclable ECH rectification water at the tower kettle, and realizing zero discharge of the biochemical wastewater.
Referring to fig. 1, a specific method for treating biochemical wastewater in electronic grade epoxy resin production comprises 3 steps of pH pre-adjustment, biochemical wastewater negative pressure rectification, and ECH chromatography recovery, and specifically comprises the following steps:
(1) pH Pre-adjustment step
Conveying the electronic-grade epoxy resin biochemical wastewater to a pH adjusting tank through a pump, introducing carbon dioxide gas into the tank, and performing neutralization reaction with the wastewater in the tank. And regulating the pH value to 8.0-9.0 by controlling the amount of introduced carbon dioxide gas.
(2) Negative pressure rectification process of biochemical wastewater
Conveying the biochemical wastewater with the pH value pre-adjusted by the pH adjusting tank to a rectifying tower for negative pressure rectification, introducing carbon dioxide gas to the tower kettle of the rectifying tower while rectifying, and controlling the introduction amount of the carbon dioxide gas by detecting the pH value of the tower kettle of the analyzing tower. After the mixed gas of the epoxy chloropropane, the water and the carbon dioxide obtained at the top of the rectification tower is condensed by a condenser, the epoxy chloropropane and the water are condensed and enter a chromatography process; the non-condensable gas carbon dioxide is pressurized by a compressor and then recycled. And collecting the ECH distilled water obtained from the tower bottom and recycling the ECH distilled water for the refining procedure of the electronic grade epoxy resin production.
The rectification tower adopts
The Raschig ring packing is scattered, the height of the packing is 5.8m to 7.2m, the pressure at the top of the tower is controlled to be 18kPa (A) to 30kPa (A), the temperature at the bottom of the tower is controlled to be 59 ℃ to 72 ℃, and the carbon dioxide gas introduction amount is 10Nm3/h～50Nm3/h。
(3) ECH chromatographic recovery procedure
Epichlorohydrin and water from the biochemical wastewater negative pressure rectification process enter a chromatography tank for layering, the water on the upper layer flows back to a rectification tower, and the epichlorohydrin on the lower layer is recovered and used as a raw material for producing electronic-grade epoxy resin.
The present invention will be described in detail with reference to specific examples.
Example 1
Referring to fig. 1, a specific method for treating biochemical wastewater in electronic grade epoxy resin production comprises 3 steps of pH pre-adjustment, biochemical wastewater negative pressure rectification, and ECH chromatography recovery, and specifically comprises the following steps:
(1) pH Pre-adjustment step
Conveying the electronic-grade epoxy resin biochemical wastewater to a pH adjusting tank through a pump, introducing carbon dioxide gas into the tank, and performing neutralization reaction with the wastewater in the tank. The pH value is adjusted to 8.4 by controlling the amount of carbon dioxide gas introduced.
(2) Negative pressure rectification process of biochemical wastewater
Conveying the biochemical wastewater with the pH value pre-adjusted by the pH adjusting tank to a rectifying tower for negative pressure rectification, introducing carbon dioxide gas to the tower kettle of the rectifying tower while rectifying, and controlling the introduction amount of the carbon dioxide gas by detecting the pH value of the tower kettle of the analyzing tower.Specifically, in this embodiment, the biochemical wastewater inlet amount is 3m3H, the height of the packing of the rectifying tower is 6.4 m: (
Raschig ring packing bulk pile), the pressure of the top of the tower is 20kPa (A), the temperature of the bottom of the tower is 61 ℃, and the carbon dioxide gas is introduced into the tower with the amount of 12Nm3H; after the mixed gas of epoxy chloropropane, water and carbon dioxide obtained from the top of the rectifying tower is condensed by a condenser, the epoxy chloropropane and the water are condensed and enter a chromatography process; the non-condensable gas carbon dioxide is pressurized by a compressor and then recycled. And (3) obtaining ECH distilled water at the tower bottom, wherein the content of epoxy chloropropane in the ECH distilled water at the tower top and the tower bottom is 18 ppm. And collecting the ECH distilled water and then reusing the collected ECH distilled water in the refining process of the electronic grade epoxy resin production.
(3) ECH chromatographic recovery procedure
Epichlorohydrin and water from the biochemical wastewater negative pressure rectification process enter a chromatography tank for layering, the water on the upper layer flows back to a rectification tower, the epichlorohydrin on the lower layer is recovered, and the recovery rate of the epichlorohydrin is 99.2 percent and is used as a raw material for producing electronic grade epoxy resin.
Example 2
Referring to fig. 1, a specific method for treating biochemical wastewater in electronic grade epoxy resin production comprises 3 steps of pH pre-adjustment, biochemical wastewater negative pressure rectification, and ECH chromatography recovery, and specifically comprises the following steps:
(1) pH Pre-adjustment step
Conveying the electronic-grade epoxy resin biochemical wastewater to a pH adjusting tank through a pump, introducing carbon dioxide gas into the tank, and performing neutralization reaction with the wastewater in the tank. The pH value is adjusted to 8.6 by controlling the amount of carbon dioxide gas introduced.
(2) Negative pressure rectification process of biochemical wastewater
Conveying the biochemical wastewater with the pH value pre-adjusted by the pH adjusting tank to a rectifying tower for negative pressure rectification, introducing carbon dioxide gas to the tower kettle of the rectifying tower while rectifying, and controlling the introduction amount of the carbon dioxide gas by detecting the pH value of the tower kettle of the analyzing tower. Specifically, in this embodiment, the biochemical wastewater inlet amount is 5m3H, height of the packing of the rectification column 6 m: (
Raschig ring packing bulk pile), the pressure of the top of the tower is 30kPa (A), the temperature of the bottom of the tower is 69.5 ℃, and the carbon dioxide gas is introduced into the tower with the volume of 20Nm3H; after the mixed gas of epoxy chloropropane, water and carbon dioxide obtained from the top of the rectifying tower is condensed by a condenser, the epoxy chloropropane and the water are condensed and enter a chromatography process; the non-condensable gas carbon dioxide is pressurized by a compressor and then recycled. The ECH distilled water obtained from the tower bottom has 29ppm of epoxy chloropropane content in the ECH distilled water of the tower top bottom. And collecting the ECH distilled water and then reusing the collected ECH distilled water in the refining process of the electronic grade epoxy resin production.
(3) ECH chromatographic recovery procedure
Epichlorohydrin and water from the biochemical wastewater negative pressure rectification process enter a chromatography tank for layering, the water on the upper layer flows back to a rectification tower, the epichlorohydrin on the lower layer is recovered, and the recovery rate of the epichlorohydrin is 99.1 percent and is used as a raw material for producing electronic grade epoxy resin.
Example 3
Referring to fig. 1, a specific method for treating biochemical wastewater in electronic grade epoxy resin production comprises 3 steps of pH pre-adjustment, biochemical wastewater negative pressure rectification, and ECH chromatography recovery, and specifically comprises the following steps:
(1) pH Pre-adjustment step
Conveying the electronic-grade epoxy resin biochemical wastewater to a pH adjusting tank through a pump, introducing carbon dioxide gas into the tank, and performing neutralization reaction with the wastewater in the tank. The pH value is adjusted to 8.6 by controlling the amount of carbon dioxide gas introduced.
(2) Negative pressure rectification process of biochemical wastewater
Conveying the biochemical wastewater with the pH value pre-adjusted by the pH adjusting tank to a rectifying tower for negative pressure rectification, introducing carbon dioxide gas to the tower kettle of the rectifying tower while rectifying, and controlling the introduction amount of the carbon dioxide gas by detecting the pH value of the tower kettle of the analyzing tower. Specifically, in this embodiment, the biochemical wastewater inflow is 10m3H, height of the packing of the rectification column 7 m: (
Raschig ring packing bulk pile), the pressure at the top of the tower is 25kPa (A), the temperature at the bottom of the tower is 65.5 ℃, and the carbon dioxide gas is introduced with 42Nm3H; after the mixed gas of epoxy chloropropane, water and carbon dioxide obtained from the top of the rectifying tower is condensed by a condenser, the epoxy chloropropane and the water are condensed and enter a chromatography process; the non-condensable gas carbon dioxide is pressurized by a compressor and then recycled. The ECH distilled water obtained from the tower bottom has 25ppm of epoxy chloropropane content in the ECH distilled water from the tower top and the tower bottom. And collecting the ECH distilled water and then reusing the collected ECH distilled water in the refining process of the electronic grade epoxy resin production.
(3) ECH chromatographic recovery procedure
The epichlorohydrin and water from the biochemical wastewater negative pressure rectification process enter a chromatography tank for layering, the water on the upper layer reflows to a rectification tower, the epichlorohydrin on the lower layer is recycled, and the recycling rate of the epichlorohydrin is 99.3 percent and is used as a raw material for producing electronic grade epoxy resin.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A method for treating biochemical wastewater in electronic-grade epoxy resin production is characterized in that the biochemical wastewater is subjected to negative pressure rectification, carbon dioxide gas is introduced into a tower kettle of a rectification tower while rectification is carried out, a neutral condition is kept, hydrolysis of epoxy chloropropane is inhibited, glycerin is generated by the hydrolysis of the epoxy chloropropane, the epoxy chloropropane is condensed and recovered from the tower top, ECH rectification water capable of being recycled is generated in the tower kettle, and zero discharge of the biochemical wastewater is realized.
2. The method for treating biochemical wastewater in the production of electronic grade epoxy resin according to claim 1, wherein the pH value of the biochemical wastewater is adjusted to 8.0-9.0 before negative pressure rectification.
3. The method for treating biochemical wastewater in the production of electronic grade epoxy resin according to claim 2, wherein the pH pre-adjustment process is performed before the biochemical wastewater is subjected to negative pressure rectification, and the specific method comprises the following steps: conveying the biochemical wastewater to a pH adjusting tank, introducing carbon dioxide gas into the pH adjusting tank, performing neutralization reaction with the biochemical wastewater in the tank, and adjusting the pH value of the biochemical wastewater to 8.0-9.0 by controlling the amount of the introduced carbon dioxide gas.
4. The method for treating biochemical wastewater in the production of electronic grade epoxy resin according to claim 1, wherein the rectifying tower adopts
The Raschig rings are piled in bulk, and the height of the packing is 5.8 m-7.2 m.
5. The method for treating biochemical wastewater in the production of electronic grade epoxy resin according to claim 1, wherein the pressure at the top of the rectifying tower is controlled at 18kPa (A) -30 kPa (A), the temperature at the bottom of the rectifying tower is controlled at 59-72 ℃, and the carbon dioxide gas is introduced in an amount of 10Nm3/h～50Nm3/h。
6. The method for treating biochemical wastewater in the electronic-grade epoxy resin production according to claim 1, wherein a mixed gas of epichlorohydrin, water and carbon dioxide is obtained from the top of the rectification column, and after the mixed gas is condensed by a condenser, epichlorohydrin and water are condensed and enter a chromatography process, and the epichlorohydrin is obtained by chromatography recovery; the non-condensable gas carbon dioxide is pressurized by a compressor and then recycled.
7. The method for treating biochemical wastewater in the production of electronic-grade epoxy resin according to claim 6, wherein epichlorohydrin and water are condensed and then enter a chromatography tank for layering, the water at the upper layer flows back to a rectifying tower, and the epichlorohydrin at the lower layer is recovered and used as a raw material for the production of electronic-grade epoxy resin.
8. The method for treating biochemical wastewater in the production of electronic-grade epoxy resin according to claim 1, wherein the ECH distilled water obtained from the tower bottom is collected and reused in the refining process of the production of electronic-grade epoxy resin.
9. The method for treating biochemical wastewater in the production of electronic-grade epoxy resin according to claim 1, wherein the amount of carbon dioxide introduced is controlled by detecting the pH value of the bottom of the analysis column during the process of introducing carbon dioxide into the bottom of the rectification column.
10. The method for treating biochemical wastewater in the production of electronic-grade epoxy resin according to claim 1, wherein the hydrolysis of epichlorohydrin in the rectifying tower is monitored by online detection of chloride ions, so as to inhibit the hydrolysis of epichlorohydrin to glycerol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011340809.0A CN114539187A (en) | 2020-11-25 | 2020-11-25 | Method for treating biochemical wastewater in production of electronic-grade epoxy resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011340809.0A CN114539187A (en) | 2020-11-25 | 2020-11-25 | Method for treating biochemical wastewater in production of electronic-grade epoxy resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114539187A true CN114539187A (en) | 2022-05-27 |
Family
ID=81659510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011340809.0A Pending CN114539187A (en) | 2020-11-25 | 2020-11-25 | Method for treating biochemical wastewater in production of electronic-grade epoxy resin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114539187A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2040480C1 (en) * | 1992-06-16 | 1995-07-25 | Подкопов Виктор Михайлович | Method of sewage treatment in production of epoxy resins |
| CN1931848A (en) * | 2006-09-28 | 2007-03-21 | 蓝星化工新材料股份有限公司无锡树脂厂 | Process of recovering epoxy chloropropane from effluent |
| CN101117258A (en) * | 2007-07-24 | 2008-02-06 | 浙江大学 | Method for treating epoxy resin waste-water with high alkalinity, high salt and high content of organics |
| JP2009045508A (en) * | 2007-08-13 | 2009-03-05 | Mitsubishi Gas Chem Co Inc | Method for treating waste water in epoxy resin production |
| CN105712520A (en) * | 2014-12-05 | 2016-06-29 | 中国石油化工股份有限公司 | Processing method of epoxy chloropropane wastewater |
-
2020
- 2020-11-25 CN CN202011340809.0A patent/CN114539187A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2040480C1 (en) * | 1992-06-16 | 1995-07-25 | Подкопов Виктор Михайлович | Method of sewage treatment in production of epoxy resins |
| CN1931848A (en) * | 2006-09-28 | 2007-03-21 | 蓝星化工新材料股份有限公司无锡树脂厂 | Process of recovering epoxy chloropropane from effluent |
| CN101117258A (en) * | 2007-07-24 | 2008-02-06 | 浙江大学 | Method for treating epoxy resin waste-water with high alkalinity, high salt and high content of organics |
| JP2009045508A (en) * | 2007-08-13 | 2009-03-05 | Mitsubishi Gas Chem Co Inc | Method for treating waste water in epoxy resin production |
| CN105712520A (en) * | 2014-12-05 | 2016-06-29 | 中国石油化工股份有限公司 | Processing method of epoxy chloropropane wastewater |
Non-Patent Citations (1)
| Title |
|---|
| 左鑫: "介绍一种有效控制pH的CO2法", 《化学清洗》, vol. 2005, no. 2, pages 36 - 57 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102674489B (en) | high-concentration ammonia-containing wastewater treatment method based on vapour compression | |
| CN104630825A (en) | Device and process for electrolytically extracting copper in acidic etching liquid | |
| CN105692996A (en) | Novel process for treating industrial wastewater with benzyl alcohol | |
| CN110482756B (en) | Method for recycling epichlorohydrin wastewater | |
| CN109097605A (en) | A kind of method of mercury in efficient cryogenic recovery acid mud | |
| CN103012090B (en) | Method for recovering organic matters in polyester wastewater | |
| CN104130152A (en) | Process for treating low-concentration DMF wastewater by double-effect rectification method with heat pump | |
| CN210278686U (en) | Sulfur dioxide and hydrogen chloride containing tail gas recovery processing device | |
| CN205328646U (en) | Tombarthite processing effluent treatment plant | |
| CN105154676B (en) | A kind of useless mercury catalyst integrated conduct method | |
| CN114539187A (en) | Method for treating biochemical wastewater in production of electronic-grade epoxy resin | |
| CN106219852B (en) | Novel method and device for comprehensively treating benzyl alcohol production wastewater | |
| CN106379952A (en) | Apparatus and process for treating ammonia nitrogen wastewater and recycling ammonia | |
| CN105130051A (en) | Process for treating landfill leachate by using ammonia nitrogen separating membrane and special equipment for process | |
| CN105645490A (en) | Rare-earth processing wastewater treatment plant and technique | |
| TWI532681B (en) | A method for recovering ethylene glycol and acetaldehyde from polyester wastewater | |
| CN113233422B (en) | Method and system for separating SiF4 and HF mixed gas | |
| CN114588650B (en) | Combined hydrochloric acid resolving process | |
| CN104860444A (en) | Device and method for recovering coal tar in semi-coke wastewater | |
| CN104876400A (en) | Iron-carbon micro-electrolysis integrative reaction device | |
| CN109650646B (en) | Treatment method of glycine production wastewater | |
| CN103708571A (en) | Technology for treating dilute hydrochloric acid waste liquid generated in production process of ADC (azodicarbonamide) foaming agent | |
| CN208825182U (en) | A kind of solid-state waste mineral oil disposal system | |
| CN212833548U (en) | Closed boiling device for stopping styrene rectifying tower | |
| CN212403459U (en) | Deep analytical equipment of olefine acid concentration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |