CN1298841A - Process for treating waste water generated by synthesizing p(o)-nitroanisole - Google Patents
Process for treating waste water generated by synthesizing p(o)-nitroanisole Download PDFInfo
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- CN1298841A CN1298841A CN 99124230 CN99124230A CN1298841A CN 1298841 A CN1298841 A CN 1298841A CN 99124230 CN99124230 CN 99124230 CN 99124230 A CN99124230 A CN 99124230A CN 1298841 A CN1298841 A CN 1298841A
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- China
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- neighbour
- waste water
- nitroanisole
- nitrophenol
- wastewater treatment
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Abstract
The present invention relates to a treatment method of waste water produced in the synthesis of para (ortho) nitromethylphenate, it includes: (1) acidification; waste water is reacted with sulfuric acid, and control pH value at 2-4; (2) cooling and crystalization: the acidified liquid obtained in acidification is cooled to 25 deg.c, the para(ortho) nitrophenol in acidified liquid is crystallized and para(ortho) nitrophenol is filtered out; (3) compounding solution: the filtrale obtained from cooling and crystallization is added with sodium sulfide, and then it is discharged as raw material for synthesizing para (ortho) amino methyphenate. The advantage of present invention is that it can effectively remove and recover para (ortho) nitrophenol, and the waste water after treatment can be cyclically reused.
Description
The present invention relates to a kind of treatment process that contains organic waste water, particularly a kind of synthetic to (neighbour) Nitroanisole in wastewater produced treatment process.
The waste water that generally produces in handling (neighbour) Nitroanisole normally carries out waste water with biochemical method at present, or carries out dilution discharge, but waste water can not reach emission standard.
The purpose of this invention is to provide a kind of can effectively remove in the waste water to (neighbour) Nitroanisole, reclaim simultaneously (neighbour) nitrophenols and the method for wastewater treatment that utilizes the waste water cyclic regeneration to produce.
Technical scheme of the present invention is that design is a kind of synthetic to wastewater treatment method in (neighbour) Nitroanisole, it is characterized in that: wastewater treatment comprises (1) acidification reaction: waste water is mixed with sulfuric acid react, pH value is controlled at 2～4, (2) crystallisation by cooling: the acidizing fluid of acidification reaction gained is cooled to 25 ℃, in the acidizing fluid to the crystallization of (neighbour) nitrophenol, filter out nitrophenol to (neighbour), (3) solution preparation: the filtrate of crystallisation by cooling gained is added the Sodium Sulphide discharge, described acidification reaction is at normal temperatures, reaction times is 1～2 hour, the described crystallisation by cooling time is 10～12 hours, temperature is below 25 ℃, each hour stirred 5 minutes, and described solution is formulated as 80～110 ℃ of temperature, and the concentration of Sodium Sulphide is 270～300g/l.
Advantage of the present invention be can effectively remove reclaim in the waste water to (neighbour) nitrophenols, and utilize waste water Recycling after handling, and waste discharge not in Production Flow Chart.
Elaborate below in conjunction with the embodiment of the invention, will synthetic in to (neighbour) Nitroanisole in wastewater produced to (neighbour) nitrophenol sodium and sulfuric acid reaction, its reaction molecular formula:
PH value is controlled at 2～4, reaction times is 1～2 hour, acidizing fluid is cooled to below 25 ℃ then, to the crystallization of (neighbour) nitrophenol, the crystallisation by cooling time is 10～12 hours, each hour stirred 5 minutes simultaneously, allow to (neighbour) nitrophenol sufficient crystallising macrobead filtered and recycled, with filtered and recycled (neighbour) nitrophenol crystalline solution is added Sodium Sulphide, under 80～110 ℃ of conditions, Sodium Sulphide concentration is controlled in 270～300g/l scope, this Gas with Sodium Sulfide Solution can be used as to produce synthesizes the raw material in (neighbour) anisidine flow process, reaches wastewater zero discharge.Every processing one cubical waste water can reclaim purity＞95% to 6.4～8 kilograms of (neighbour) nitrophenol.
Claims (4)
1, a kind of synthetic to wastewater treatment method in (neighbour) Nitroanisole, it is characterized in that: wastewater treatment comprises
(1) acidification reaction: waste water mixed with sulfuric acid react, pH value is controlled at 2～4, in the waste water to (neighbour) nitrophenol sodium and its reaction molecular formula of sulfuric acid reaction:
(2) crystallisation by cooling: the acidizing fluid of acidification reaction gained is cooled to 25 ℃, in the acidizing fluid to the crystallization of (neighbour) nitrophenol, filter out nitrophenol to (neighbour),
(3) solution preparation: discharge behind the filtrate adding Sodium Sulphide with the crystallisation by cooling gained,
2, synthesize wastewater treatment method in (neighbour) Nitroanisole by claim 1 is described, it is characterized in that: described acidification reaction is at normal temperatures, and the reaction times is 1～2 hour,
3, synthesize wastewater treatment method in (neighbour) Nitroanisole by claim 1 is described, it is characterized in that: the described crystallisation by cooling time is 10～12 hours, and temperature is below 25 ℃, and each hour stirred 5 minutes,
4, described synthetic to wastewater treatment method in (neighbour) Nitroanisole by claim 1, it is characterized in that: described solution is formulated as 80～110 ℃ of temperature, and the concentration of Sodium Sulphide is 270～300g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124230 CN1298841A (en) | 1999-12-09 | 1999-12-09 | Process for treating waste water generated by synthesizing p(o)-nitroanisole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124230 CN1298841A (en) | 1999-12-09 | 1999-12-09 | Process for treating waste water generated by synthesizing p(o)-nitroanisole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1298841A true CN1298841A (en) | 2001-06-13 |
Family
ID=5283316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99124230 Pending CN1298841A (en) | 1999-12-09 | 1999-12-09 | Process for treating waste water generated by synthesizing p(o)-nitroanisole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1298841A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368382C (en) * | 2006-06-19 | 2008-02-13 | 常州市佳森化工有限公司 | Process of crystallizing separating amino methyl phenoxide mixture |
| CN102639451A (en) * | 2009-12-01 | 2012-08-15 | 哈凯姆斯凡恩化学公司 | Method for treating wastewater produced during the manufacture of nitro compounds |
-
1999
- 1999-12-09 CN CN 99124230 patent/CN1298841A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368382C (en) * | 2006-06-19 | 2008-02-13 | 常州市佳森化工有限公司 | Process of crystallizing separating amino methyl phenoxide mixture |
| CN102639451A (en) * | 2009-12-01 | 2012-08-15 | 哈凯姆斯凡恩化学公司 | Method for treating wastewater produced during the manufacture of nitro compounds |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |