CN1188356C - Waste water treating method for methyl ethyl ketone production - Google Patents
Waste water treating method for methyl ethyl ketone production Download PDFInfo
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- CN1188356C CN1188356C CNB021314624A CN02131462A CN1188356C CN 1188356 C CN1188356 C CN 1188356C CN B021314624 A CNB021314624 A CN B021314624A CN 02131462 A CN02131462 A CN 02131462A CN 1188356 C CN1188356 C CN 1188356C
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- gas
- waste water
- treatment
- tower
- stripping column
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The present invention provides a pretreatment method of waste water discharged during methyl ethyl ketone production, which belongs to the technical field of organic chemical waste water treatment. The method uses gas stripping treatment as the core, the waste water produced during the production of methyl ethyl ketone is pumped into a stripping tower to be treated in a gas stripping way after being heated to certain temperature, countercurrent operation is adopted in the stripping tower, air is introduced in from the tower bottom, and filling material is filled in the tower; the waste water enters a biochemical system to be treated biochemically after being treated in a gas stripping way, and discharge gas is discharged in the air or combusted catalytically. Thus, the efficiency of subsequent biochemical treatment can be greatly improved because a large quantity of highly volatile pollution substances in the waste water are eliminated in advance. The method has the advantages of stable and reliable treatment effects, simple and practical operation, easy realization and industrialization application.
Description
Technical field
The present invention relates to a kind of treatment process of organic chemical waste water, is the treatment process that methylethylketone (MEK) is produced waste discharge furtherly.
Background technology
Methylethylketone (MEK) is a kind of excellent solvent, is the important source material of fine chemistry industry, mainly is used in fields such as coating material production, lubricating oil dewaxing, tape cleaning, coating stripper.
In actual production, because the waste water composition complexity that the MEK production equipment is discharged contains multiple pollution substances such as methylethylketone, methyl alcohol, the trimethyl carbinol, sec-butyl alcohol, CODcr directly carries out biochemical treatment and is difficult to realize qualified discharge up to 15000mg/L.Because MEK produces the composition more complicated of waste discharge, adopt general coagulation, biochemical method to be difficult to handle, though adopt methods such as charcoal absorption, advanced oxidation can reach processing requirements, processing cost is too high again, therefore need develop the appropriate pretreatment technology MEK factory effluent is carried out carrying out biochemical treatment again after the pre-treatment.
The producer of domestic production MEK seldom, and is therefore also very insufficient to the research of MEK factory effluent pretreatment process.Carrying out pretreated research at methylethylketone production waste discharge does not specially at present both at home and abroad appear in the newspapers.Therefore can only be with reference to the treatment technology of approximate high concentrated organic wastewater in the prior art.
Vaporizing extract process and blow-off method are a kind of methods of using always in the processing of present high concentrated organic wastewater.Stripping or blow-off method all belong to the process of liquid phase to mass transferring in gas phase, are actually the inverse process-desorb of absorption.Vaporizing extract process strippant commonly used is a steam, the phase transition process that blow-off method generally carries out under normal temperature, normal pressure, and employed strippant is generally air, nitrogen etc.Vaporizing extract process generally is used to handle the waste water that pollutent component concentration is higher, boiling point is lower.
Mentioned a kind of treatment process of discharged alkali liqnid of synthesizing octene aldehyde system among the Chinese patent CN1065642A.This invention is handled at the sig water of octenal reactive system discharging, and the basicity of this alkali lye is 0.8～1.3% (weight), and CODcr is 30000～50000mg/L.This invention adopts decompression falling film evaporation-stripping process to handle sig water, the purpose that can realize reclaiming high alkali liquid and reduce sig water CODcr.Though the desorb processing has also been used in this invention, the pre-treatment of MEK being produced waste discharge is also inapplicable.One of purpose that at first is this invention is to reclaim high alkali liquid, and the composition of MEK production equipment waste discharge is very complicated, and the purification reuse wherein cost of component is very high; Secondly this patent adopts steam stripped, and steam consumption is very big, and is dangerous high, operational requirement and all higher to the requirement of stripping apparatus, and economic serviceability is not strong.
In addition, U.S. Pat-5,458,789 and US-5,158,603 and Chinese patent CN-1122774A and CN-11059722A also all used the operational path that stripping is handled.But substantially all be to adopt steam stripped, and need to reclaim useful matter, not strong to the directive significance of handling MEK production waste discharge.
Thus, with regard to present research situation, also do not produce the bibliographical information of waste discharge treatment process both at home and abroad about methylethylketone.According to the analysis of front, yet there are some problems in the processing that more existing steam stripping techniques are directly used in MEK production waste discharge simultaneously: often use steam to carry out desorb as vaporizing extract process, and dangerous big, the cost height.And blow-off method uses strippings such as air at normal temperatures, and its treatment effect is not good enough.Therefore, need develop effective processing that a kind of economic and practical technology realizes the MEK waste discharge.
Summary of the invention
At the deficiencies in the prior art, the invention provides the treatment process that a kind of new MEK produces waste discharge, when reaching processing requirements, have advantages such as processing efficiency height, running cost are low, easy and simple to handle, be easy to realize industrial applications.
Since MEK produce boiling point that waste discharge mainly pollutes component except that sec-butyl alcohol all below 100 ℃, so the present invention adopts the gas formulation that the MEK factory effluent is carried out pre-treatment, carries out biochemical treatment afterwards again.Gas formulation herein and conventional vaporizing extract process difference mainly are after waste water is heated up, to carry out desorb rather than carry out desorb with steam with gas.
Pretreatment process of the present invention mainly may further comprise the steps:
A. methylethylketone is produced waste discharge and be warming up to 50～90 ℃;
B. above-mentioned waste water is fed the gas stripping column that fills filler, simultaneously in gas stripping column with waste water countercurrent direction bubbling air;
C. waste water, waste gas after stripping process are distinguished the vent gas stripper;
Stripping tower general in the gas stripping column structure that the present invention uses and the prior art is identical.The operating method of gas stripping column is a counter-current operation in the present invention, and gas-water ratio remains on 50～150, and specific liquid rate remains on 5.0～40.0m
3/ m
2H, gas stripping column number of theoretical plate are not less than 18.
The inflow temperature of gas stripping column should remain on 50～90 ℃.According to achievement in research of the present invention, the temperature of rising waste water is favourable to the treatment effect that improves waste water.But, along with the rising of wastewater temperature, the working cost of wastewater treatment also increases thereupon.Therefore need guarantee that gas puies forward the suitable temperature of selections under the prerequisite of effect, recommendation waste water is warming up to 50～90 ℃, preferred 60～85 ℃.
The gas-water ratio that gas is proposed operation should remain on 50～150.Gas-water ratio is one of important operation parameter of the present invention, and gas-water ratio is excessive, causes the gas stripping column liquid flooding easily; Gas-water ratio is low excessively, can't reach the treatment effect of expection again, therefore needs to select suitable gas-water ratio.The gas-water ratio of recommending gas to propose operation is 50～150, is preferably 60～130.
The specific liquid rate that gas is proposed operation should remain on 5.0～40.0m
3/ m
2H.On behalf of gas stripping column, specific liquid rate handle the ability of waste water, in tolerance one regularly, adopts excessive specific liquid rate, and the liquid holdup on inner-tower filling material surface increases, but the free cross-section that supplied gas is passed through minimizing is easy to cause liquid flooding, and causing gas to propose operation can't carry out; And specific liquid rate is too small, can't guarantee the wetting efficiency on inner-tower filling material surface again, and this will cause processing efficiency low.Therefore, must select suitable specific liquid rate, can guarantee that gas carries carrying out smoothly of operation, can give full play to the processing power of gas stripping column again, recommending gas to carry the specific liquid rate that operation adopts is 5.0～40.0m
3/ m
2H, preferred 8.0～35.0m
3/ m
2H.
The number of theoretical plate of gas stripping column should be no less than 18.The number of theoretical plate of gas stripping column is directly connected to the processing efficiency that gas is proposed operation, and number of theoretical plate is very few, does not then reach pretreated requirement, number of theoretical plate is too much, will cause the invalid height of gas stripping column to increase again, therefore for guaranteeing treatment effect, recommend number of theoretical plate to be no less than 18, preferred 18～30.
Filler in the gas stripping column adopts conventional fillers, prolongs orifice ring, cascade ring etc. as the Asia.
To after discharge the gas tower, the waste water after the stripping process enter follow-up biochemical treatment system and carry out biochemical treatment the waste gas high altitude discharge that stripping tower is discharged or carry out catalyticcombustion.Common biochemical processing method such as activated sludge process or contact oxidation method etc. are adopted in biochemical treatment.
The present invention adopts the gas formulation as the pretreated basic skills of MEK factory effluent, can effectively handle complicated component and the very high waste water of CODcr by better simply step like this.This method treatment effect is reliable and stable, easy to operation, the processing efficiency height, and not high to equipment requirements, cost is lower, is easy to realize industrial applications.
Produce at MEK under the situation of waste discharge water inlet CODcr≤15000mg/L, handle through this pretreatment process, water outlet CODcr can be stabilized in below the 4500mg/L, and is convenient to biochemical treatment, thereby greatly reduces the difficulty of follow-up biochemical treatment.Propose pre-treatment and follow-up biochemical treatment etc. through gas, the production waste discharge of methylethylketone can reach emission standard, and CODcr can be less than 100mg/L.
Description of drawings
Accompanying drawing 1 is produced the schematic flow sheet of waste discharge pretreatment process for methylethylketone of the present invention.
Below in conjunction with accompanying drawing 1 detailed process of the present invention is described:
Because the temperature of rising methylethylketone (MEK) factory effluent is favourable to improving the stripping process effect, therefore need make the temperature of MEK factory effluent rise to 50～90 ℃ by heating installation such as interchanger, is preferably 60～85 ℃.Treating that MEK waste water rises to enters gas stripping column (with common stripping tower) behind the preset temperature and carries out stripping process, gas stripping column adopts counter-current operation, waste water flows down through liquid distribution device from top of tower, and air feeds through gas distributor from tower bottom, filling dumped packing in the tower.Orifice ring or cascade ring are prolonged in the optional Asia of filler.For guaranteeing treatment effect and treatment capacity, the gas-water ratio that gas is proposed operation should remain on 50～150, is preferably 60～130; The waste water specific liquid rate should remain on 5.0～40.0m
3/ m
2H, preferred 8.0～35.0m
3/ m
2H.The number of theoretical plate of gas stripping column should be not less than 18, is preferably 18～30.Waste water after stripping process enters biochemical treatment system and carries out biochemical treatment, waste gas high altitude discharge or carry out catalyticcombustion.Biochemical treatment system can adopt contact oxidation method.
Embodiment
Further describe the present invention below in conjunction with embodiment.Scope of the present invention is not subjected to the restriction of these embodiment, and scope of the present invention proposes in the appended claims.
Embodiment 1
MEK produces and enters gas stripping column after waste discharge is warming up to 50 ℃, and former water CODcr is 14963mg/L.Waste water flows down through liquid distribution device from top of tower, and air feeds at the bottom of tower, and the waste water specific liquid rate is 40m
3/ m
2H, gas-water ratio is 50,18 of gas stripping column number of theoretical plates.
Through stripping process, MEK produces waste discharge CODcr and reduces to 4300mg/L, reaches the pre-treatment target.
Stripping process water is handled through catalytic oxidation, and water outlet CODcr reduces to 80mg/L, reaches national secondary discharge standard.
Embodiment 2
MEK produces and enters gas stripping column after waste discharge is warming up to 90 ℃, and former water CODcr is 14963mg/L.Waste water flows down through liquid distribution device from top of tower, and air feeds at the bottom of tower, and the waste water specific liquid rate is 5m
3/ m
2H, gas-water ratio is 150,30 of gas stripping column number of theoretical plates.
Through stripping process, MEK produces waste discharge CODcr and reduces to 2100mg/L, reaches the pre-treatment target.
Stripping process water is handled through catalytic oxidation, and water outlet CODcr reduces to 70mg/L, reaches national secondary discharge standard.
Comparative Examples 1
MEK produces waste discharge and directly enters gas stripping column without heating up, and former water CODcr is 14963mg/L.Waste water flows down through liquid distribution device from top of tower, and air feeds at the bottom of tower, and the waste water specific liquid rate is 5m
3/ m
2H, gas-water ratio is 150,30 of gas stripping column number of theoretical plates.
Through stripping process, MEK produces waste discharge CODcr still up to 11000mg/L, reaches the pre-treatment target far away.
Comparative Examples 2
MEK produces and enters gas stripping column after waste discharge is warming up to 90 ℃, and former water CODcr is 14963mg/L.Waste water flows down through liquid distribution device from top of tower, and air feeds at the bottom of tower, and the waste water specific liquid rate is 5m
3/ m
2H, gas-water ratio is 150,15 of gas stripping column number of theoretical plates.
Through stripping process, MEK produces waste discharge CODcr and reduces to 5500mg/L, does not reach the pre-treatment target as yet.
Claims (5)
1. a methylethylketone is produced the pretreatment process of waste discharge, may further comprise the steps in order:
A. methylethylketone is produced waste discharge and be warming up to 50～90 ℃;
B. above-mentioned waste water is fed the gas stripping column that fills filler, simultaneously in gas stripping column with waste water countercurrent direction bubbling air;
C. waste water, waste gas after stripping process are distinguished the vent gas stripper;
Wherein gas-water ratio remains on 50～150 in the gas stripping column, and specific liquid rate remains on 5.0～40.0m
3/ m
2H, the number of theoretical plate of gas stripping column column plate is more than or equal to 18.
2. pretreatment method for wastewater according to claim 1, wherein said methylethylketone is produced waste discharge and is warming up to 60～85 ℃.
3. gas-water ratio remains on 60～130 in the pretreatment method for wastewater according to claim 1, wherein said gas stripping column.
4. specific liquid rate remains on 8.0～35.0m in the pretreatment method for wastewater according to claim 1, wherein said gas stripping column
3/ m
2H.
5. pretreatment method for wastewater according to claim 1, wherein said gas stripping column number of theoretical plate is 18～30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021314624A CN1188356C (en) | 2002-10-16 | 2002-10-16 | Waste water treating method for methyl ethyl ketone production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021314624A CN1188356C (en) | 2002-10-16 | 2002-10-16 | Waste water treating method for methyl ethyl ketone production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1490253A CN1490253A (en) | 2004-04-21 |
| CN1188356C true CN1188356C (en) | 2005-02-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021314624A Expired - Lifetime CN1188356C (en) | 2002-10-16 | 2002-10-16 | Waste water treating method for methyl ethyl ketone production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188356C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2067749A1 (en) * | 2007-11-29 | 2009-06-10 | Total Petrochemicals France | Process for purification of an aqueous phase containing polyaromatics |
| CN101830532B (en) * | 2010-05-12 | 2013-04-03 | 正和集团股份有限公司 | Acrylic acid wastewater preprocessing process |
| CN102417264B (en) * | 2010-09-28 | 2013-05-01 | 中国石油化工股份有限公司 | Method for treating nitrochlorobenzene production wastewater |
| CN102417265B (en) * | 2010-09-28 | 2013-05-01 | 中国石油化工股份有限公司 | Method for effectively removing organic matters in wastewater from nitrochlorobenzene production |
| CN102617005A (en) * | 2012-04-20 | 2012-08-01 | 上海化学工业区中法水务发展有限公司 | Method for treating waste water drained during dichloroethane production |
| CN112374567A (en) * | 2020-11-10 | 2021-02-19 | 山西沃能化工科技有限公司 | Method for removing combustible toxic and harmful gas in production sewage |
-
2002
- 2002-10-16 CN CNB021314624A patent/CN1188356C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1490253A (en) | 2004-04-21 |
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Granted publication date: 20050209 |