CN102872708B - Method for inhibiting grease from generating in alkaline tower - Google Patents
Method for inhibiting grease from generating in alkaline tower Download PDFInfo
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- CN102872708B CN102872708B CN201110193468.3A CN201110193468A CN102872708B CN 102872708 B CN102872708 B CN 102872708B CN 201110193468 A CN201110193468 A CN 201110193468A CN 102872708 B CN102872708 B CN 102872708B
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- caustic wash
- wash tower
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Abstract
The invention relates to a method for inhibiting grease from generating in an alkaline tower, mainly solving the problem of easiness in tower blockage and inconvenient operation of the alkaline tower caused by bad grease inhibition effect in the prior art. The method disclosed herein is characterized by continuously on-line injecting an inhibitor, wherein the inhibitor is selected from at least one of the groups shown in the description, R represents at least one of alkyl or aryl containing 0-15 carbon atoms. The method disclosed herein well solves the problem and can be applied in the alkaline towers for petroleum ethene, preparing ethene from methanol, preparing propylene from methanol, vinyl acetate, dichloroethylene, epoxypropane, etc.
Description
Technical field
The present invention relates to a kind of method suppressing butter generation in caustic wash tower.
Background technology
In the industrial processes such as oil ethene, producing ethylene from dehydration of ethanol (ETO), methanol-to-olefins (MTO), preparing propylene from methanol (MTP), vinyl acetate, dichloroethylene, expoxy propane, in order to obtain the target product meeting purity requirement, or unreacted Matter Transfer utilizes, the logistics flowed out from reactor all needs through a series of purification, separating-purifying process.In these industrial processes, all unavoidably generate some acid impurities as CO
2deng.And if these acidic materials are not removed, adverse effect will be caused in follow-up production.Therefore be necessary to carry out alkali cleaning removing acidic materials CO to reaction end gas
2deng, this just must use with sodium hydrate aqueous solution is the caustic wash tower of medium.Meanwhile, in these industrial processes, all unavoidably generate some aldehydes (as acetaldehyde), ketone compounds (as acetone).And these aldehydes and ketone compounds are through caustic wash tower, under the effect of alkali, Aldol condensation reaction can be there is, namely two molecule alpha-position carbon atoms there is the aldehydes or ketones of active H atom, addition reaction generates beta-hydroxy aldehyde, then addition reaction generates the clear yellow viscous polymerization of certain molecular weight further, and this is commonly called butter in oil ethylene unit.The generation of butter affects normal operation and the alkali cleaning effect of caustic wash tower, and consumes a large amount of alkali lye, and distributor and filler in the tower of the easy polymerization fouling blocking of a large amount of butter simultaneously, cause stifled tower phenomenon, the cycle of operation of caustic wash tower is shortened.In addition, the salkali waste containing a large amount of butter is arranged outward, brings difficulty to the operation of downstream facility.Therefore, corresponding measure must be made for this phenomenon.
Document US5879534 discloses in dichloroethylene production process, add the carbonyls not forming enolization structure with acetaldehyde, as formaldehyde, glyoxal, benzaldehyde, formic acid, ethanedioic acid, paraformaldehyde, P-methoxybenzal-dehyde etc., make it react with acetaldehyde under the effect of alkali, suppress to form polymer." Kingsoft oiling is fine; 2000; 3:25-28; the commercial Application of butter inhibitor HK-1312 ", reports the service condition of caustic wash tower butter inhibitor in a kind of oil ethylene unit, but " spectrographic laboratory; 2003; 20 (3): 287-290, the application study of infrared spectrum in ethylene unit caustic washing system butter composition and formation mechanism are analyzed ", report that the effect of this kind of butter inhibitor is not fairly obvious.Document US6986839 discloses the generation that a kind of amino acids suppresses butter in caustic wash tower in oil ethylene unit.Document CN101348410A discloses the scheme of three components of a kind of alcamine compound, hydrazide kind compound, alkyl amine compound, suppresses the generation of butter in caustic wash tower in oil ethylene unit.Document US5264114 discloses the generation that a kind of aminated compounds suppresses butter in caustic wash tower in oil ethylene unit, and aminated compounds molecular formula is RNH
2and R
2nH, wherein R is alkyl or aromatic radical.It is X-(R) that document US5900495 discloses one molecular formula
n-X
1aminated compounds suppress the problem of acetaldehyde polymerization in caustic wash tower in propylene oxide unit, wherein X is amido or the alkylamino radical containing 1 ~ 5 carbon, X
1for hydrogen, hydroxyl, amido or the alkylamino radical containing 1 ~ 5 carbon; N is 1 ~ 4; R is-CH
2nH-, arlydene or the alkyl containing 2 ~ 10 carbon.
But inhibitor result of use is still bad in above-mentioned document, easily produces butter in caustic wash tower, there is stifled tower phenomenon, operation inconvenience.
Summary of the invention
Technical problem to be solved by this invention is that to there is butter inhibition in conventional art not good, causes caustic wash tower easily stifled tower, unhandy problem, provides a kind of method that in suppression caustic wash tower newly, butter generates.The method can suppress the generation of butter effectively, extends the cycle of operation of caustic wash tower, reduces the environmental pollution caused because of butter discharge.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of method suppressing butter generation in caustic wash tower, comprise and inhibitor on-line continuous being injected, wherein said inhibitor is selected from
in at least one; Wherein, R is containing at least one in the alkyl of 0 ~ 15 carbon atom or aromatic radical.
In technique scheme, described inhibitor preferred version is for being selected from
in at least one; Wherein, R is containing at least one in the alkyl of 0 ~ 5 carbon atom.Inhibitor accounts for total stream concentrations 5 ~ 500ppm after injecting, and preferable range is 20 ~ 150ppm.Described inhibitor preferred version is injected by the alkali lye circular route place of caustic wash tower.
The inventive method can be used for the industrial production such as oil ethene, ETO, MTO, MTP, vinyl acetate, dichloroethylene, expoxy propane and uses caustic wash tower and contain in material in the industrial production of aldehydes or ketones.
Aldehyde (as acetaldehyde) in caustic wash tower material or ketone (as acetone) are under the effect of alkali, Aldol condensation reaction can be there is, namely two molecule alpha-position carbon atoms there is the aldehydes or ketones of active H atom, under NaOH effect, reaction generates beta-hydroxy aldehyde, then be added to the polymer of certain molecular weight further, generate butter.The butter generated causes the COD value of discharging spent lye to increase, and causes environmental pollution.Therefore, for reason above, the inventive method adopts and is selected from
in at least one aminopyridines as butter inhibitor, make its preferential and aldehydes or ketones reaction, the material generated is stablized in the basic conditions, no longer there is further polymerisation, and can be dissolved in alkali lye, thus effectively inhibit the generation of butter, extend the cycle of operation of caustic wash tower, plant running, after 30 days, occurs there are no stifled tower phenomenon; And effectively reduce the COD value of discharge spent lye, reduce the environmental pollution caused because of butter discharge, achieve good technique effect.
Below by embodiment, the present invention is further elaborated.
Detailed description of the invention
[embodiment 1]
Inhibitor is applied to ETO device caustic wash tower, wherein caustic wash tower enters material mole and consists of: ethene 49.1%, water 50.25%, acetaldehyde 0.05%, ether 0.01%, C
3 +hydrocarbon 0.58%, CO
20.01%.Caustic wash tower alkali liquid temperature 45 DEG C, alkali lye (NaOH) concentration 10%, uses piston pump to be injected continuously in alkali lye circular route by inhibitor PA, implantation concentration 50ppm, and plant running, after 30 days, occurs there are no stifled tower phenomenon.Adopt COD value in the method for testing test alkali lye of GB8978-1996 to be 897 mg/litre, the results are shown in Table 1.
[embodiment 2 ~ 9]
By [embodiment 1] each step, the inhibitor just added and concentration difference thereof, concrete outcome is in table 1.
[comparative example 1]
By [embodiment 1] each step, just without inhibitor.After 5 days, there is stifled tower phenomenon in plant running.In the method for testing test alkali lye of employing GB8978-1996, COD value is up to 6324 mg/litre.
Table 1
Claims (1)
1. the method suppressing butter in caustic wash tower to generate, is applied to ETO device caustic wash tower by inhibitor, wherein caustic wash tower enters material mole and consists of: ethene 49.1%, water 50.25%, acetaldehyde 0.05%, ether 0.01%, C
3 +hydrocarbon 0.58%, CO
20.01%; Caustic wash tower alkali liquid temperature 45 DEG C, NaOH concentration of lye 10%, uses piston pump to be injected continuously in alkali lye circular route by inhibitor PA, implantation concentration 50ppm, and plant running, after 30 days, occurs there are no stifled tower phenomenon; COD value in the method for testing test alkali lye of GB8978-1996 is adopted to be 897 mg/litre.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110193468.3A CN102872708B (en) | 2011-07-12 | 2011-07-12 | Method for inhibiting grease from generating in alkaline tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110193468.3A CN102872708B (en) | 2011-07-12 | 2011-07-12 | Method for inhibiting grease from generating in alkaline tower |
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| CN102872708A CN102872708A (en) | 2013-01-16 |
| CN102872708B true CN102872708B (en) | 2015-05-13 |
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| CN201110193468.3A Active CN102872708B (en) | 2011-07-12 | 2011-07-12 | Method for inhibiting grease from generating in alkaline tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3292902A1 (en) * | 2016-09-08 | 2018-03-14 | Borealis AG | Method for reducing and/or inhibiting aldol condensation in gas scrubbers |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107641069B (en) * | 2017-09-26 | 2021-05-11 | 中国神华能源股份有限公司 | Treatment method of methanol-to-olefin product gas |
| CN107628922B (en) * | 2017-09-26 | 2021-05-11 | 中国神华能源股份有限公司 | Processing system of methanol-to-olefin product gas |
| CN114163290B (en) * | 2021-12-06 | 2024-02-27 | 万华化学集团股份有限公司 | Butter inhibitor for alkaline washing tower and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5264114A (en) * | 1991-03-25 | 1993-11-23 | Phillips Petroleum Company | Hydrocarbon treating process |
| US5714055A (en) * | 1996-08-12 | 1998-02-03 | Nalco/Exxon Energy Chemicals, L.P. | Caustic tower trap for acetaldehyde |
| CN101358144A (en) * | 2007-07-31 | 2009-02-04 | 中国石油天然气股份有限公司 | Inhibitor of polymerization reaction in hydrocarbon cracking and alkaline cleaning operation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2002348713A1 (en) * | 2002-06-26 | 2004-01-19 | Dorf Ketal Chemicals India Pvt. Ltd. | Method of removal of carbonyl compounds along with acid gases from cracked gas in ethylene process |
-
2011
- 2011-07-12 CN CN201110193468.3A patent/CN102872708B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5264114A (en) * | 1991-03-25 | 1993-11-23 | Phillips Petroleum Company | Hydrocarbon treating process |
| US5714055A (en) * | 1996-08-12 | 1998-02-03 | Nalco/Exxon Energy Chemicals, L.P. | Caustic tower trap for acetaldehyde |
| CN101358144A (en) * | 2007-07-31 | 2009-02-04 | 中国石油天然气股份有限公司 | Inhibitor of polymerization reaction in hydrocarbon cracking and alkaline cleaning operation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3292902A1 (en) * | 2016-09-08 | 2018-03-14 | Borealis AG | Method for reducing and/or inhibiting aldol condensation in gas scrubbers |
| WO2018046606A1 (en) * | 2016-09-08 | 2018-03-15 | Borealis Ag | Method for reducing and/or inhibiting aldol condensation in gas scrubbers |
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|---|---|
| CN102872708A (en) | 2013-01-16 |
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