CN109293089A - A kind of processing method of TDI production neutral and alkali brine waste - Google Patents
A kind of processing method of TDI production neutral and alkali brine waste Download PDFInfo
- Publication number
- CN109293089A CN109293089A CN201811265011.7A CN201811265011A CN109293089A CN 109293089 A CN109293089 A CN 109293089A CN 201811265011 A CN201811265011 A CN 201811265011A CN 109293089 A CN109293089 A CN 109293089A
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- China
- Prior art keywords
- tdi
- brine waste
- organic matter
- processing method
- production
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Classifications
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- 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
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The present invention relates to the processing methods of the alkaline brine waste generated in heavy solvent method TDI production, the following steps are included: alkaline brine waste is delivered in reaction kettle by a., hydrochloric acid is added to neutralize, converts sodium chloride for sodium hydroxide, sodium carbonate, and adjusts solution as acidity；B. in acid condition, liquor natrii hypochloritis is added to aoxidize, and is passed through pressure sky, oxidation operation is decomposed, the solution after analysis is qualified is sent to electrowinning process；C. the gas generated in reaction process activated carbon adsorption organic matter heel row atmosphere, the regular barrelling of the organic matter of collection.It after waste water is carried out oxidation processes by the present invention, send to electrowinning process and recycles, realize the zero-emission of waste water, there is significant economic benefit and social benefit.
Description
Technical field
The alkaline saliferous that the invention belongs to generate during technical field of waste water processing, especially heavy solvent method production TDI
The method of wastewater treatment.
Background technique
In TDI device production process, excessive phosgene and exhaust gas are needed to be absorbed by lye, be destroyed, after exhaust gas is absorbed, row
Waste liquid out contains a variety of salt compounds such as sodium chloride (3-5%), sodium carbonate (5-10%) and sodium hydroxide (2-5%), also carries secretly
Gas chromatography (TOC is up to 200 ppm).Since sodium salt is higher in waste water, so this waste water is known as alkaline brine waste, can give birth to
The property changed is poor, and processing difficulty is high, cannot simply use biochemical treatment, and materializing strategy process is more complex, and processing cost is higher, is dirty
The generally acknowledged highly difficult processing waste water of water treatment field, becomes a great problem of company's efforts at environmental protection, as national and industry is to ring
Guaranteed request further increases, and alkaline brine waste is treated as company's efforts at environmental protection problem urgently to be resolved.
The universal processing method of high slat-containing wastewater is film process and evaporation and concentration at present, and film process can only carry out waste water dense
Contracting reduces wastewater treatment capacity, and organic matter boiling point is higher in the alkaline brine waste that TDI device generates, using evaporation and concentration, no
It can be separated with salinity, therefore both of which can not achieve recycling for salinity, the target of zero-emission is not achieved.Chinese patent
103058427 A of CN discloses " processing method of brine waste in TDI production process ", this method comprises: a. brine waste
Acidification neutralization is carried out with hydrochloric acid or hydrogen chloride, remove carbonate and generates decarbonated brine；B. it removes in decarbonated brine
The small oil droplet of the lubricating oil contained；C. step b treated effluent brine is sufficiently mixed with sodium hypochlorite, is removed with aoxidizing
Organic pollutant；D. the effluent brine after oxidation processes is removed into impurity, then setting by filling active carbon by metallic filter
It is standby to remove micro organic matter, subsequently into electrowinning process.Byproduct of the sodium hypochlorite as company has very strong oxidation
Ability can be more satisfactory processing method with the organic matter in oxygenolysis waste water.But treated that salt is water-soluble for this method
The technic index (ppm of TOC≤10) of electrolytic brine is not achieved in content of organics or excessively high in liquid, and process CIMS is complicated, adopts
It is unable to satisfy industrialized production with activated carbon adsorption, therefore, this method is not applied industrially.
Summary of the invention
It is an object of the invention to solve the defect of existing processing technique, a kind of industrial practicable effluent brine is provided
Treatment for reuse method, this method is easy to operate, easily controllable, and industrialization easy to accomplish is, it can be achieved that resource recycles.
To achieve the above object, the technical scheme adopted by the invention is as follows: a kind of processing of TDI production neutral and alkali brine waste
Method, it is characterised in that the following steps are included:
A. the alkaline brine waste generated in TDI production process is delivered in enamel reaction still, 31% hydrochloric acid is added and neutralizes, it will
Sodium hydroxide, sodium carbonate are converted into sodium chloride, and adjusting pH value of solution is 2；
B. in acid condition, liquor natrii hypochloritis is added to aoxidize, and is passed through pressure sky, oxidation operation is decomposed, is reacted
Time is not less than 1 h, and the solution after analysis is qualified is sent to electrowinning process；
C. the gas generated in above-mentioned reaction process activated carbon adsorption heel row atmosphere, the regular barrelling of the organic matter of collection；
The hydrochloric acid product generated in d.TDI production is as neutralization reagent, return step a；The sodium hypochlorite that electrowinning process generates is molten
Liquid is as oxidant, return step b；Sodium hydroxide, chlorine, the hydrogen of electrowinning process production are used for TDI synthesis procedure, realize money
Source recycles.
The organic matter collected in the step c, using activated carbon adsorption, then with low-pressure steam blowback, barrelling after cooling,
It send to environmental protection center and burns, realize organic matter recycling.
The beneficial effects of the present invention are: the alkaline brine waste in the production TDI production of heavy solvent method is carried out oxidation processes
After be directly used in electrowinning process, realize the zero-emission of waste water and recycling for resource, effectively reduce the life of TDI product
Cost is produced, is made that outstanding contributions for efforts at environmental protection.
Detailed description of the invention
Fig. 1 is flow diagram of the present invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, example for explaining only the invention, and
It is non-to be used to limit the scope of the invention.
Embodiment 1, it is 200 ppm, pH 14, NaCl content 5%, through following step that TDI, which produces neutral and alkali brine waste TOC,
Suddenly it is handled:
A. by the alkaline brine waste pipeline generated in TDI process units operational process to enamel reaction still (1500 L)
In, 31% hydrochloric acid is added from hydrochloric acid product delivery pump adapter tube line and neutralizes, converts sodium chloride for sodium hydroxide, sodium carbonate, and adjust
PH value of solution is 2, which is the important parameter of oxidation effectiveness；
B. under above-mentioned acid condition, liquor natrii hypochloritis's (0.5 wt% contains effective chlorine 10%) is added and is aoxidized, and is passed through
Pressure is empty, oxidation operation is decomposed, 1 h of reaction time, and after processing, the solution after analysis TOC is qualified is sent to electrowinning process；
C. the gas generated in above-mentioned reaction process activated carbon adsorption organic constituents heel row atmosphere, after adsorption saturation, then is used
Low-pressure steam (0.2 MPa) blowback, barrelling after cooling are sent to environmental protection center and are burned, and realize organic matter recovery processing, avoid
Pollute environment.
D. the hydrochloric acid product that TDI process units generates is as neutralization reagent, return step a；The secondary chlorine that electrowinning process generates
Oxidant of the acid sodium solution as processing brine waste, return step b；Sodium hydroxide, chlorine, the hydrogen of electrowinning process production are used
In TDI synthesis procedure, resource circulation utilization is realized.
Treated saline solns, TOC are 6 ppm, pH 5.8, and NaCl content 21% requires, TOC according to electrolysis process
Content is less than 10 ppm, and saline solns fully meet electrolytic brine technic index after processing.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Any modification, equivalent substitution, improvement and etc. done within principle, should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of processing method of TDI production neutral and alkali brine waste, it is characterised in that the following steps are included:
A. the alkaline brine waste generated in TDI production process is delivered in enamel reaction still, 31% hydrochloric acid is added and neutralizes, it will
Sodium hydroxide, sodium carbonate are converted into sodium chloride, and adjusting pH value of solution is 2；
B. in acid condition, liquor natrii hypochloritis is added to aoxidize, and is passed through pressure sky, oxidation operation is decomposed, is reacted
Time is not less than 1 h, and the solution after analysis is qualified is sent to electrowinning process；
C. the gas generated in above-mentioned reaction process activated carbon adsorption heel row atmosphere, the regular barrelling of the organic matter of collection.
2. a kind of processing method of TDI production neutral and alkali brine waste as described in claim 1, it is characterised in that further include step
The hydrochloric acid product generated in rapid d:TDI production is as neutralization reagent, return step a；The liquor natrii hypochloritis that electrowinning process generates
As oxidant, return step b；Sodium hydroxide, chlorine, the hydrogen of electrowinning process production are used for TDI synthesis procedure, realize resource
It recycles.
3. a kind of processing method of TDI production neutral and alkali brine waste as described in claim 1, it is characterised in that: the step
The organic matter collected in rapid c using activated carbon adsorption, then uses low-pressure steam blowback, realizes that organic matter recycles.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811265011.7A CN109293089A (en) | 2018-10-29 | 2018-10-29 | A kind of processing method of TDI production neutral and alkali brine waste |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811265011.7A CN109293089A (en) | 2018-10-29 | 2018-10-29 | A kind of processing method of TDI production neutral and alkali brine waste |
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| CN109293089A true CN109293089A (en) | 2019-02-01 |
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| CN201811265011.7A Pending CN109293089A (en) | 2018-10-29 | 2018-10-29 | A kind of processing method of TDI production neutral and alkali brine waste |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112499817A (en) * | 2020-11-26 | 2021-03-16 | 中化环境科技工程有限公司 | Pretreatment method for treating TDI (toluene diisocynate) comprehensive wastewater containing foaming agent |
| CN114409157A (en) * | 2021-11-12 | 2022-04-29 | 重庆市映天辉氯碱化工有限公司 | Resource method for preparing chlor-alkali by electrolyzing waste brine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006132519A1 (en) * | 2005-06-09 | 2006-12-14 | Jaime Raygoza Mora | Composition and method for the treatment of wastewater and sewage water in order to produce drinking water |
| CN102992354A (en) * | 2011-09-19 | 2013-03-27 | 河南省汤阴县永新助剂厂 | Treatment technology for waste water generated in scorch retarder production process |
| CN103058427A (en) * | 2013-01-25 | 2013-04-24 | 甘肃银光聚银化工有限公司 | Treatment method of brine waste in production process of toluene-2,4-diisocyanate (TDI) |
-
2018
- 2018-10-29 CN CN201811265011.7A patent/CN109293089A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006132519A1 (en) * | 2005-06-09 | 2006-12-14 | Jaime Raygoza Mora | Composition and method for the treatment of wastewater and sewage water in order to produce drinking water |
| CN102992354A (en) * | 2011-09-19 | 2013-03-27 | 河南省汤阴县永新助剂厂 | Treatment technology for waste water generated in scorch retarder production process |
| CN103058427A (en) * | 2013-01-25 | 2013-04-24 | 甘肃银光聚银化工有限公司 | Treatment method of brine waste in production process of toluene-2,4-diisocyanate (TDI) |
Non-Patent Citations (1)
| Title |
|---|
| 唐朝春等: "氯氧化处理含酚废水试验", 《中国给水排水》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112499817A (en) * | 2020-11-26 | 2021-03-16 | 中化环境科技工程有限公司 | Pretreatment method for treating TDI (toluene diisocynate) comprehensive wastewater containing foaming agent |
| CN114409157A (en) * | 2021-11-12 | 2022-04-29 | 重庆市映天辉氯碱化工有限公司 | Resource method for preparing chlor-alkali by electrolyzing waste brine |
| CN114409157B (en) * | 2021-11-12 | 2023-10-13 | 重庆市映天辉氯碱化工有限公司 | Recycling method for preparing chlor-alkali by waste salt water electrolysis |
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