CN101143813A - Treatment method for waste water of acephate producing process - Google Patents
Treatment method for waste water of acephate producing process Download PDFInfo
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- CN101143813A CN101143813A CNA2007101131630A CN200710113163A CN101143813A CN 101143813 A CN101143813 A CN 101143813A CN A2007101131630 A CNA2007101131630 A CN A2007101131630A CN 200710113163 A CN200710113163 A CN 200710113163A CN 101143813 A CN101143813 A CN 101143813A
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- acephate
- waste water
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Abstract
The invention discloses a method of processing the process wastewater in the production of acephate. The acephate process wastewater is poured into a reaction kettle, thirty percent of sodium hydroxide solution is dripped into the acephate process wastewater at a temperature between 30 DEG C and 40 DEG C, the pH value is contolled in a range of nine to nine point five, and the ammonia gas generated by reaction is absorbed by water, so that ammonia is produced; reaction liquid is desolventized under the conditions of temperature between 80 DEG C and 100 DEG C and vacuum between-0.08 MPa and-0.1 MPa, the desolventizing time is two to four hours, the temperature is then decreased to 18 to 20 DEG C, so that the reaction liquid is crystallized, the crystallizing time is half to five hours, and finally, sodium acetate trihydrate and mother liquid are produced by extraction and filtration. The invention has the advantages of simple technique, safety, low cost, no production of three wastes and environmental protection.
Description
Technical field
The present invention relates to a kind of method of handling waste water of acephate producing process, relate in particular to and a kind ofly produce the method that reclaims ammoniacal liquor and Sodium acetate trihydrate, belong to the pesticide chemical Environmentally-sound technology by aqueous sodium hydroxide solution.
Background technology
Acephate is the acylated derivatives of insecticide methamidophos, is the broad spectrum insecticide of a kind of efficient, low toxicity, low residue, is one of desirable kind that replaces high poison, persistent pesticide.Along with the China's sale and use of complete prohibition riskiest pesticide acephatemet later in 2007, the production and selling of acephate will welcome more wide space.
At present, domestic have a manufacturer of tame acephate more than 30, and production technique is similar.Ammonia liquor neutralization process is mostly adopted in aftertreatment, and the defective of this technology is to produce a large amount of waste water of acephate producing process, has improved environmental protection cost and environment protection difficulty.Along with country and social input and concern to environmental protection, a large amount of waste water of acephate producing process that produced will become the bottleneck that restriction large-tonnage acephate is produced.
Summary of the invention
For solving the problem of above existence, the invention provides a kind of treatment process of waste water of acephate producing process, utilize waste water of acephate producing process to produce ammoniacal liquor (ammoniacal liquor can overlap and be used for neutralization reaction) and Sodium acetate trihydrate, stop the generation of the three wastes, thoroughly solve the environmental issue that acephate is produced.
For achieving the above object, the technical solution used in the present invention is:
The acephate processing wastewater is dropped in the reactor, and in 30～40 ℃ of dropping 30% aqueous sodium hydroxide solutions, control pH scope is 9～9.5, and the ammonia water that reaction produces absorbs, and makes ammoniacal liquor; Reaction solution in 80～100 ℃, vacuum-0.08～-the 0.1MPa precipitation, the precipitation time is 2-4 hour, is cooled to 18～20 ℃ of crystallizations then, crystallization time is 0.5-5 hour, last suction filtration makes Sodium acetate trihydrate and mother liquor.
The mass ratio of acephate processing wastewater and 30% aqueous sodium hydroxide solution is 100: 50～70.
Be used for absorbing ammonia water can be the cut that obtains behind the reaction solution precipitation.
The mother liquor that suction filtration makes is used to apply mechanically precipitation or applies mechanically crystallization.
The handled waste water of acephate producing process of the present invention mainly is the mixture of water and ammonium acetate, the content 30～35% of ammonium acetate.The aqueous sodium hydroxide solution that is adopted mainly is: the mixture of water and sodium hydroxide.
Reaction principle of the present invention is as follows:
CH
3COONH
4+NaOH+3H
2O＝CH
3COONa·3H
2O+NH
3·H
2O
The present invention mainly is made of the dropping sodium aqueous solution, the processes such as ammonia, precipitation, crystallization, separation, mother liquid recycle that absorb.Waste water of acephate producing process is carried out alkaline hydrolysis to be handled, the ammonia water that reaction produces or the cut of recovery absorb, make ammoniacal liquor, can apply mechanically to acephate production postprocessing working procedures the somewhat expensive Sodium acetate trihydrate that makes with cheap aqueous sodium hydroxide solution and waste water of acephate producing process.Above treatment process can reduce the acephate production cost greatly, can avoid the discharging of waste water again, and environment has been protected in the generation of having stopped the three wastes, and has created benefit, really makes waste water of acephate producing process become " giving up " and is " treasured ".
Therefore the present invention has that technology is simple, safety, cost is low and no longer produce the three wastes, do not produce the advantage of environmental pollution.
Embodiment 1:
In the glassed steel reaction vessels of 5000L, add waste water of acephate producing process 2500Kg, start stirring, drip 30% aqueous sodium hydroxide solution 1300Kg at 35 ℃, dripped 2 hours, make the pH value reach 9～9.5, absorb ammonia with 800Kg water simultaneously, make 900Kg ammoniacal liquor, content 17.1%, yield 93.3%.Reaction solution is warming up to 90 ℃, control vacuum-0.09MPa, and precipitation was cooled to 20 ℃ of crystallizations after 3 hours, and 2 hours after-filtration make Sodium acetate trihydrate 1300Kg, content 56.8%, yield 92.5%.
Embodiment 2:
In the glassed steel reaction vessels of 5000L, add waste water of acephate producing process 2500Kg, start stirring, drip 30% aqueous sodium hydroxide solution 1300Kg at 38～40 ℃, dripped 2 hours, make the pH value reach 9～9.3, absorb ammonia with 900Kg embodiment 1 cut simultaneously, make 980Kg ammoniacal liquor, content 16.8%, yield 99.5%.Reaction solution is warming up to 95 ℃, control vacuum-0.09MPa, and precipitation was applied mechanically embodiment 1 mother liquor and is cooled to 18 ℃ of crystallizations after 2.5 hours, and 2 hours after-filtration make Sodium acetate trihydrate 1395Kg, content 56.7%, yield 99.1%.
Embodiment 3:
In the glassed steel reaction vessels of 5000L, add waste water of acephate producing process 2500Kg, start stirring, drip 30% aqueous sodium hydroxide solution 1300Kg at 35 ℃, dripped 2 hours, make the pH value reach 9～9.5, absorb ammonia with 850Kg embodiment 2 cuts simultaneously, make 960Kg ammoniacal liquor, content 17.0%, yield 98.9%.Reaction solution is warming up to 85 ℃, control vacuum-0.09MPa, and precipitation was applied mechanically embodiment 2 mother liquors and is cooled to 20 ℃ of crystallizations after 3 hours, and 2 hours after-filtration make Sodium acetate trihydrate 1390Kg, content 56.2%, yield 97.8%.
More than three embodiment ammoniacal liquor average yields 97.3%, Sodium acetate trihydrate average yield 96.5%.
Claims (4)
1. the treatment process of a waste water of acephate producing process, it is characterized in that: the acephate processing wastewater is dropped in the reactor, and in 30～40 ℃ of dropping 30% aqueous sodium hydroxide solutions, control pH scope is 9～9.5, the ammonia water that reaction produces absorbs, and makes ammoniacal liquor; Reaction solution in 80～100 ℃, vacuum-0.08～-the 0.1MPa precipitation, the precipitation time is 2-4 hour, is cooled to 18～20 ℃ of crystallizations then, crystallization time is 0.5-5 hour, last suction filtration makes Sodium acetate trihydrate and mother liquor.
2. the treatment process of waste water of acephate producing process according to claim 1, it is characterized in that: the mass ratio of acephate processing wastewater and 30% aqueous sodium hydroxide solution is 100: 50～70.
3. the treatment process of waste water of acephate producing process according to claim 1 is characterized in that: be used for absorbing ammonia water be the cut that obtains behind the reaction solution precipitation.
4. the treatment process of waste water of acephate producing process according to claim 1, it is characterized in that: the mother liquor that suction filtration makes is used to apply mechanically precipitation or applies mechanically crystallization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101131630A CN101143813A (en) | 2007-10-16 | 2007-10-16 | Treatment method for waste water of acephate producing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101131630A CN101143813A (en) | 2007-10-16 | 2007-10-16 | Treatment method for waste water of acephate producing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101143813A true CN101143813A (en) | 2008-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101131630A Pending CN101143813A (en) | 2007-10-16 | 2007-10-16 | Treatment method for waste water of acephate producing process |
Country Status (1)
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| CN (1) | CN101143813A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735268B (en) * | 2009-12-07 | 2012-05-16 | 浙江嘉化集团股份有限公司 | Process for post-treatment of acephate and method for recovering waste water resources |
| CN111515215A (en) * | 2020-05-07 | 2020-08-11 | 甘肃金创绿丰环境技术有限公司 | Harmless treatment method for n-butyl thiophosphoric triamide hazardous waste |
-
2007
- 2007-10-16 CN CNA2007101131630A patent/CN101143813A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735268B (en) * | 2009-12-07 | 2012-05-16 | 浙江嘉化集团股份有限公司 | Process for post-treatment of acephate and method for recovering waste water resources |
| CN111515215A (en) * | 2020-05-07 | 2020-08-11 | 甘肃金创绿丰环境技术有限公司 | Harmless treatment method for n-butyl thiophosphoric triamide hazardous waste |
| CN111515215B (en) * | 2020-05-07 | 2021-10-29 | 甘肃金创绿丰环境技术有限公司 | Harmless treatment method for n-butyl thiophosphoric triamide hazardous waste |
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Open date: 20080319 |