CN113716781A - Method for recovering glycerin and sodium chloride in epoxy resin wastewater - Google Patents
Method for recovering glycerin and sodium chloride in epoxy resin wastewater Download PDFInfo
- Publication number
- CN113716781A CN113716781A CN202111041429.1A CN202111041429A CN113716781A CN 113716781 A CN113716781 A CN 113716781A CN 202111041429 A CN202111041429 A CN 202111041429A CN 113716781 A CN113716781 A CN 113716781A
- Authority
- CN
- China
- Prior art keywords
- wastewater
- glycerol
- sodium chloride
- recovering
- evaporator
- 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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F2103/38—Polymers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a method for recovering glycerol and sodium chloride in epoxy resin wastewater, which comprises the following steps: deoiling and aging resin; step two: recovering the solvent from the deoiled epoxy wastewater; step three: concentrating the distilled wastewater by using an MVR evaporator to obtain salt; step four: the invention has the beneficial effects that the glycerol is concentrated and recovered: the invention separates and purifies the glycerol for a plurality of times, improves the glycerol recovery efficiency, improves the glycerol quality, reduces the production cost, reduces the pollution to the environment and is beneficial to wide popularization.
Description
Technical Field
The invention relates to the technical field of glycerol, in particular to a method for recovering glycerol and sodium chloride in epoxy resin wastewater.
Background
Along with the development of industry, the discharge amount of organic wastewater is increasing day by day, and the treatment of the organic wastewater to ensure that the organic wastewater reaches the standard and is discharged or recycled has important significance. In the industrial production such as soap making industry, epichlorohydrin production, biodiesel production, glycerin production and the like, a large amount of organic wastewater with high salt and a certain concentration of glycerin is generated, the concentration of sodium chloride is about 5-25%, the content of glycerin is about 3-15%, and CODCr is about 20000-350000 mg/L. The high salt characteristics make it difficult to treat using biological processes, membrane separation, electrodialysis separation and capacitive adsorption separation, and can cause severe corrosion to the treatment equipment. At present, the treatment of high-salt glycerol-containing wastewater faces the problems of great difficulty, high cost and the like.
The glycerol is used as an important chemical raw material and has wide utilization value in the industries of organic chemical industry, polymer synthesis, daily chemicals, textiles, coatings, leather, tobacco, food, medicine and the like. For years, China has been importing a large amount of glycerin all the time, and the glycerin market keeps developing rapidly. In addition, sodium chloride is used as an important production raw material for chlor-alkali industry and the like, and has high application value. Therefore, how to effectively treat the high-salt glycerol-containing wastewater to ensure that the wastewater reaches the discharge standard so as to reduce the pollution to the environment and realize the recycling of the glycerol and the sodium chloride has great value.
Chinese patent CN102153230A discloses a method and a device for treating salt-containing wastewater from the production of epichlorohydrin by using glycerol as a raw material. The treatment process mixes the salt-containing wastewater with other wastewater with low pollution to ensure that the salt content is less than 5 percent, and adds nitrogen and phosphorus nutrients; introducing the wastewater into a moving bed membrane bioreactor, and further treating by using activated sludge; introducing the wastewater into an ozone reaction unit for ozone oxidation treatment; and (5) discharging. The treatment process has the advantages that: the treatment process is simple, the operation is stable, the cost is low, and the effluent quality can be ensured. However, the process needs to blend the waste water with low salt content, and wastes a large amount of byproducts such as sodium chloride, glycerin and the like in the waste water.
At present, no method in the prior art provides an effective recovery method of salt and glycerol in high-salt glycerol-containing wastewater. For a long time, most of high-salt glycerol-containing wastewater such as epoxy resin production wastewater in China is always in an overproof discharge state, and high-concentration sodium chloride and glycerol in the wastewater are not recycled, so that the environment is polluted, and resources are greatly wasted.
Disclosure of Invention
The invention aims to provide a method for recovering glycerin and sodium chloride in epoxy resin wastewater, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for recovering glycerin and sodium chloride in epoxy resin wastewater is characterized by comprising the following steps: the method comprises the following steps: removing oil and aging resin, and primarily removing suspended matters and floating oil substances in the epoxy wastewater, wherein the removing method comprises one of chemical precipitation, membrane separation or air flotation; step two: recovering the solvent from the deoiled epoxy wastewater, filtering the deoiled wastewater, introducing the filtered wastewater into a stripping tower, and distilling out the methyl isobutyl ketone and the organic solvent dissolved in the wastewater by using the stripping tower; step three: continuously evaporating moisture in the distilled wastewater by using an MVR evaporator or a triple-effect evaporator to improve the percentage concentration of glycerol in the wastewater, so that the glycerol is concentrated at the bottom of the MVR evaporator or the triple-effect evaporator, and simultaneously producing sodium chloride salt meeting the requirement of a byproduct; step four: and the concentrated mother liquor enters a glycerol recovery unit which comprises a single-effect evaporator and a wiped film evaporator, wherein the supernatant passes through a condenser and discharges a wastewater unit, and the concentrated glycerol product is recovered from the bottom of the wiped film evaporator.
As a further scheme of the invention: in the first step, the content of glycerin in the epoxy wastewater is 0.5%, and the content of sodium chloride is 20%.
As a further scheme of the invention: in the third step, the concentration of glycerin in the wastewater after being evaporated by the MVR evaporator accounts for 9-12 percent.
As a further scheme of the invention: in step four, wherein the concentration of the concentrated glycerol product is not less than 85%.
As a further scheme of the invention: in the fourth step, the concentrated mother liquor firstly enters a single-effect evaporator for water evaporation, and the concentrated solution flows out from the bottom and enters a scraper evaporator for glycerol recovery.
Compared with the prior art, the invention has the beneficial effects that: the invention separates and purifies the glycerol for a plurality of times, improves the glycerol recovery efficiency, improves the glycerol quality, reduces the production cost, reduces the pollution to the environment and is beneficial to wide popularization.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a method for recovering glycerin and sodium chloride from epoxy resin wastewater is characterized by comprising the following steps: the method comprises the following steps: removing oil and aging resin, and primarily removing suspended matters and floating oil substances in the epoxy wastewater, wherein the removing method comprises one of chemical precipitation, membrane separation or air flotation; step two: recovering the solvent from the deoiled epoxy wastewater, filtering the deoiled wastewater, introducing the filtered wastewater into a stripping tower, and distilling out the methyl isobutyl ketone and the organic solvent dissolved in the wastewater by using the stripping tower; step three: continuously evaporating moisture in the distilled wastewater by using an MVR evaporator or a triple-effect evaporator to improve the percentage concentration of glycerol in the wastewater, so that the glycerol is concentrated at the bottom of the MVR evaporator or the triple-effect evaporator, and simultaneously producing sodium chloride salt meeting the requirement of a byproduct; step four: and the concentrated mother liquor enters a glycerol recovery unit which comprises a single-effect evaporator and a wiped film evaporator, wherein the supernatant passes through a condenser and discharges a wastewater unit, and the concentrated glycerol product is recovered from the bottom of the wiped film evaporator.
It is noted that, in the first step, the content of glycerin in the epoxy wastewater is 0.5%, and the content of sodium chloride is 20%.
It is noted that in the third step, the concentration of glycerin in the wastewater after being evaporated by the MVR evaporator is 9-12%.
It is noted that in step four, the concentration of the glycerol product after concentration is not less than 85%.
It is worth noting that in the fourth step, the concentrated mother liquor firstly enters into the single-effect evaporator for water evaporation, and the concentrated solution flows out from the bottom and enters into the scraper evaporator for glycerol recovery.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A method for recovering glycerin and sodium chloride in epoxy resin wastewater is characterized by comprising the following steps: the method comprises the following steps: removing oil and aging resin, and primarily removing suspended matters and floating oil substances in the epoxy wastewater, wherein the removing method comprises one of chemical precipitation, membrane separation or air flotation; step two: recovering the solvent from the deoiled epoxy wastewater, filtering the deoiled wastewater, introducing the filtered wastewater into a stripping tower, and distilling out the methyl isobutyl ketone and the organic solvent dissolved in the wastewater by using the stripping tower; step three: continuously evaporating moisture in the distilled wastewater by using an MVR evaporator or a triple-effect evaporator to improve the percentage concentration of glycerol in the wastewater, so that the glycerol is concentrated at the bottom of the MVR evaporator or the triple-effect evaporator, and simultaneously producing sodium chloride salt meeting the requirement of a byproduct; step four: and the concentrated mother liquor enters a glycerol recovery unit which comprises a single-effect evaporator and a wiped film evaporator, wherein the supernatant passes through a condenser and discharges a wastewater unit, and the concentrated glycerol product is recovered from the bottom of the wiped film evaporator.
2. The method for recovering glycerol and sodium chloride in epoxy resin wastewater as claimed in claim 1, wherein: in the first step, the content of glycerin in the epoxy wastewater is 0.5%, and the content of sodium chloride is 20%.
3. The method for recovering glycerol and sodium chloride in epoxy resin wastewater as claimed in claim 1, wherein: in the third step, the concentration of glycerin in the wastewater after being evaporated by the MVR evaporator accounts for 9-12 percent.
4. The method for recovering glycerol and sodium chloride in epoxy resin wastewater as claimed in claim 1, wherein: in step four, wherein the concentration of the concentrated glycerol product is not less than 85%.
5. The method for recovering glycerol and sodium chloride in epoxy resin wastewater as claimed in claim 1, wherein: in the fourth step, the concentrated mother liquor firstly enters a single-effect evaporator for water evaporation, and the concentrated solution flows out from the bottom and enters a scraper evaporator for glycerol recovery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111041429.1A CN113716781A (en) | 2021-09-07 | 2021-09-07 | Method for recovering glycerin and sodium chloride in epoxy resin wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111041429.1A CN113716781A (en) | 2021-09-07 | 2021-09-07 | Method for recovering glycerin and sodium chloride in epoxy resin wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113716781A true CN113716781A (en) | 2021-11-30 |
Family
ID=78682251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111041429.1A Pending CN113716781A (en) | 2021-09-07 | 2021-09-07 | Method for recovering glycerin and sodium chloride in epoxy resin wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113716781A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114590948A (en) * | 2022-04-26 | 2022-06-07 | 扬州大学 | Harmless treatment and resource utilization process for epoxy resin production wastewater |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101796012A (en) * | 2007-09-06 | 2010-08-04 | 阿肯马法国公司 | The method that is used for the reactive evaporation of glycerine |
| CN102238990A (en) * | 2008-10-03 | 2011-11-09 | 代谢探索者公司 | Method for purifying an alcohol from a fermentation broth using a falling film, a wiped film, a thin film or a short path evaporator |
| US20160200652A1 (en) * | 2013-08-19 | 2016-07-14 | REG Life Sciences, LLC | Production of partially refined waste glycerol |
| CN106809999A (en) * | 2017-03-17 | 2017-06-09 | 黄山清源环境工程技术服务有限公司 | Epoxy resin high-concentration waste water processing system |
| CN109455865A (en) * | 2018-12-27 | 2019-03-12 | 科盛环保科技股份有限公司 | A kind of epoxy propane waste water pretreating process |
| CN109824625A (en) * | 2019-02-20 | 2019-05-31 | 江苏扬农化工集团有限公司 | A kind of method of epoxy resin key intermediate epoxychloropropane production utilization of wastewater resource |
| CN110228828A (en) * | 2018-03-05 | 2019-09-13 | 南通星辰合成材料有限公司 | A kind of epoxy resin high-salt wastewater concentration purification system and its method of purification |
| US20200346961A1 (en) * | 2019-07-17 | 2020-11-05 | Qingdao University Of Science And Technology | Saline glycerine wastewater treatment system and technology |
| CN112374676A (en) * | 2020-10-22 | 2021-02-19 | 江苏扬农化工集团有限公司 | Device and method for separating and purifying byproducts in epichlorohydrin wastewater |
-
2021
- 2021-09-07 CN CN202111041429.1A patent/CN113716781A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101796012A (en) * | 2007-09-06 | 2010-08-04 | 阿肯马法国公司 | The method that is used for the reactive evaporation of glycerine |
| CN102238990A (en) * | 2008-10-03 | 2011-11-09 | 代谢探索者公司 | Method for purifying an alcohol from a fermentation broth using a falling film, a wiped film, a thin film or a short path evaporator |
| US20160200652A1 (en) * | 2013-08-19 | 2016-07-14 | REG Life Sciences, LLC | Production of partially refined waste glycerol |
| CN106809999A (en) * | 2017-03-17 | 2017-06-09 | 黄山清源环境工程技术服务有限公司 | Epoxy resin high-concentration waste water processing system |
| CN110228828A (en) * | 2018-03-05 | 2019-09-13 | 南通星辰合成材料有限公司 | A kind of epoxy resin high-salt wastewater concentration purification system and its method of purification |
| CN109455865A (en) * | 2018-12-27 | 2019-03-12 | 科盛环保科技股份有限公司 | A kind of epoxy propane waste water pretreating process |
| CN109824625A (en) * | 2019-02-20 | 2019-05-31 | 江苏扬农化工集团有限公司 | A kind of method of epoxy resin key intermediate epoxychloropropane production utilization of wastewater resource |
| US20200346961A1 (en) * | 2019-07-17 | 2020-11-05 | Qingdao University Of Science And Technology | Saline glycerine wastewater treatment system and technology |
| CN112374676A (en) * | 2020-10-22 | 2021-02-19 | 江苏扬农化工集团有限公司 | Device and method for separating and purifying byproducts in epichlorohydrin wastewater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114590948A (en) * | 2022-04-26 | 2022-06-07 | 扬州大学 | Harmless treatment and resource utilization process for epoxy resin production wastewater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101481190B (en) | Process for treating saponification wastewater by chlorohydrination | |
| CN108439694B (en) | Treatment method of high-salt and high-organic waste water evaporation and concentration coupled with thermal catalytic carbon crystallization | |
| CN106186537A (en) | A kind of evaporative crystallization new technology of high salt high concentrated organic wastewater | |
| CN104291523A (en) | Method for recovering sodium chloride and glycerin from glycerin-containing high-salinity organic wastewater | |
| CN102432136A (en) | Method for treating wastewater of rubber vulcanization accelerator N-cyclohexyl-2-benzothiazole sulfonamide | |
| CN104230124B (en) | Coal chemical industry wastewater zero emission technique and specific equipment thereof | |
| CN110683716A (en) | Wastewater treatment process for wastewater generated by automobile accessory coating production line | |
| CN104909494A (en) | Process for impurity removal and purification of industrial high-concentration brine and special equipment of process | |
| CN104230083B (en) | High salt contains the recovery method of sodium-chlor and glycerine in glycerine high concentrated organic wastewater | |
| CN104230082B (en) | A kind of high salt contains the retrieving arrangement of sodium-chlor and glycerine in glycerine high concentrated organic wastewater | |
| CN111661979B (en) | Leachate recycling method and device | |
| CN108017233B (en) | Method for treating sewage of forestry chemical enterprises | |
| CN102344225B (en) | Processing method of salty wastewater in cellulose ether production | |
| CN103613159A (en) | Treatment process of phenol-containing wastewater in dicumyl peroxide production | |
| CN113716781A (en) | Method for recovering glycerin and sodium chloride in epoxy resin wastewater | |
| CN103896457B (en) | A kind of Fine Chemistry Wastewater treatment process | |
| CN104355470B (en) | The retrieving arrangement of glycerine in highly salt containing organic waste water | |
| CN109896714B (en) | Pretreatment method of rubber auxiliary CBS production wastewater | |
| CN105776684A (en) | Urban sewage treatment and resource recycling method | |
| CN204111505U (en) | Coal Chemical Industry haline water purifying and evaporative crystallization recovery process specific equipment | |
| CN104230084B (en) | High salt contains the retrieving arrangement of sodium-chlor and glycerine in glycerine high concentrated organic wastewater | |
| CN107867776B (en) | Method and process for recycling pesticide wastewater | |
| CN104326872A (en) | Method for recycling glycerol in organic wastewater with high salt content | |
| CN104724881A (en) | Treatment method for high salinity industrial wastewater | |
| CN104230659B (en) | A kind of high salt contains the recovery method of sodium-chlor and glycerine in glycerine high concentrated organic wastewater |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211130 |
|
| RJ01 | Rejection of invention patent application after publication |