CN105330048B - A kind of preprocess method of methanol-to-olefins spent lye - Google Patents
A kind of preprocess method of methanol-to-olefins spent lye Download PDFInfo
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- CN105330048B CN105330048B CN201410290881.5A CN201410290881A CN105330048B CN 105330048 B CN105330048 B CN 105330048B CN 201410290881 A CN201410290881 A CN 201410290881A CN 105330048 B CN105330048 B CN 105330048B
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- spent lye
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- methanol
- oil removal
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- 238000000034 method Methods 0.000 title claims abstract description 42
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 187
- 239000003513 alkali Substances 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 43
- 238000004140 cleaning Methods 0.000 claims abstract description 42
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 23
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000001590 oxidative effect Effects 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 239000007800 oxidant agent Substances 0.000 claims abstract description 12
- 239000007791 liquid phase Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 8
- -1 MTO alkene Chemical class 0.000 claims abstract description 8
- 239000002351 wastewater Substances 0.000 claims abstract description 7
- 238000007796 conventional method Methods 0.000 claims abstract description 4
- 238000006213 oxygenation reaction Methods 0.000 claims abstract 2
- 150000001336 alkenes Chemical class 0.000 claims description 31
- 239000000243 solution Substances 0.000 claims description 18
- 125000001477 organic nitrogen group Chemical group 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 13
- 150000001412 amines Chemical class 0.000 claims description 8
- 230000035484 reaction time Effects 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 12
- 239000005977 Ethylene Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 235000014121 butter Nutrition 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 239000003518 caustics Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 229960004217 benzyl alcohol Drugs 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Landscapes
- Epoxy Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to a kind of preprocess method of methanol-to-olefins spent lye, step is：The first step, alkali cleaning processing is carried out to the MTO alkene gas containing sour gas, auxiliary agent is used in alkali cleaning, the MTO alkene gas after alkali cleaning continues with into subsequent handling；Second step, the liquid phase progress oil removal to alkali cleaning discharge are handled to obtain the spent lye after oil removal is handled, and oil slick caused by oil removal processing is further disposed according to a conventional method；3rd step, the spent lye after handling oil removal carry out oxidation processes, and oxidant use air or oxygen, and oxidation water outlet carries out subsequent treatment using common process, or oxidation water outlet mixed with MTO devices other waste water after routinely technique progress subsequent treatment.The preprocess method of methanol-to-olefins spent lye of the present invention, treatment effect is stable, NaOH consumptions are low, oxidant is cheap and easy to get, and water outlet is further processed after being mixed with other waste water of MTO devices into conventional sewage Treatment stations.
Description
Technical field
The present invention relates to methanol-to-olefins (MTO) technical field, specifically a kind of pre- place of methanol-to-olefins spent lye
Reason method.
Background technology
The low-carbon alkenes such as ethene, propylene are important Organic Chemicals, have ten in modern petroleum and chemical industry
Divide important effect.Traditionally the source of ethene and propylene is mainly hydrocarbon vapours cracking, and raw material is mainly naphtha.In recent years
Come, oxygenatedchemicals alkene (OTO) technique has reached its maturity, and especially methanol-to-olefins (MTO) technique has started on a large scale
Using.
The composition of conventional ethylene spent lye, by mass percentage, each group are disclosed in Chinese patent CN102180486A
In point：Vulcanized sodium accounts for 10-20%, and sodium carbonate accounts for 4-5%, and sodium hydroxide accounts for 1-3%.
The COD contents of conventional ethylene spent lye are disclosed in Chinese patent CN102923901A：20000-50000mg/L.
Chinese patent CN102424498A compares comprehensive introduction to the processing method of conventional ethylene spent lye.Mesh
Before, the processing method of conventional ethylene spent lye mainly has oxidizing process, the precipitation method, neutralisation and spent lye is comprehensively utilized.
From the point of view of the giving information on the situation of Chinese patent CN102424498A, the problem of this several method can not all avoid sulfide, so as to lead
Cause current processing method that all center of gravity is placed in the processing or comprehensive utilization of sulfide.
MTO techniques are to come preparing low-carbon olefins, material benzenemethanol not sulfur-bearing, and in MTO production processes by raw material of methanol
Also without using sulfide, so sulfide is not present in MTO spent lyes, this causes the characteristic and conventional ethylene of MTO spent lyes
There were significant differences for spent lye.For prior art, there is not yet producing the open report with disposition about MTO spent lyes.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of the pre- of methanol-to-olefins spent lye
Processing method, treatment effect is stable, NaOH consumptions are low, oxidant is cheap and easy to get, after water outlet can mix with other waste water of MTO devices
It is further processed into conventional sewage Treatment stations.
To achieve the above objectives, the present invention adopts the technical scheme that：
A kind of preprocess method of methanol-to-olefins spent lye, it is characterised in that comprise the following steps：
The first step, alkali cleaning processing is carried out to the MTO alkene gas containing sour gas, in order to reduce the negative work that alkali cleaning is brought
With, it is necessary to use auxiliary agent in alkali cleaning, the MTO alkene gas after alkali cleaning continues with into subsequent handling；
Second step, the liquid phase progress oil removal to alkali cleaning discharge handle to obtain the spent lye after oil removal is handled, oil removal processing production
Raw oil slick is further disposed according to a conventional method；
3rd step, the spent lye after handling oil removal carry out oxidation processes, and oxidant uses air or oxygen, aoxidizes water outlet
Subsequent treatment is carried out using common process, or oxidation water outlet mix with MTO devices other waste water after routinely technique progress is subsequently
Processing.
On the basis of above-mentioned technical proposal, in the first step, the MTO alkene gas containing sour gas is：Contain CO2
MTO alkene gas.
On the basis of above-mentioned technical proposal, in the first step, alkali cleaning processing from mass concentration be 5%~10% it is fresh
NaOH solution,
The auxiliary agent is the aqueous solution of amine mixture, and the wherein total mass concentration of amine mixture is 48%~52%, N
The mass concentration of element is 6%~7%.
On the basis of above-mentioned technical proposal, in the first step, the addition of NaOH solution and the mass ratio of MTO alkene gas
For 1%-2%,
In the first step, the addition of auxiliary agent and the mass ratio of MTO alkene gas are 50ppm~200ppm.
On the basis of above-mentioned technical proposal, in second step, the liquid phase discharged using oil partition tank to alkali cleaning is carried out at oil removal
Reason, wherein, residence time of the spent lye in oil partition tank is at least 2h.
On the basis of above-mentioned technical proposal, in the 3rd step, oxidizing reaction temperature is 200~300 DEG C；Reaction time is
30min~360min.
On the basis of above-mentioned technical proposal, in the 3rd step, addition and the spent lye COD mass ratios of the air are
10~30,
The addition of the oxygen is 1.5~5 with spent lye COD mass ratios.
The preprocess method of methanol-to-olefins spent lye of the present invention, treatment effect is stable, NaOH consumptions are low, oxidation
Agent is cheap and easy to get, and water outlet is further processed after being mixed with other waste water of MTO devices into conventional sewage Treatment stations.
Brief description of the drawings
The present invention has drawings described below：
The process flow diagram of Fig. 1 present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in figure 1, the preprocess method of methanol-to-olefins spent lye of the present invention, comprises the following steps：
The first step, alkali cleaning processing is carried out to the MTO alkene gas containing sour gas, in order to reduce the negative work that alkali cleaning is brought
With, it is necessary to use auxiliary agent in alkali cleaning, the MTO alkene gas after alkali cleaning continues with into subsequent handling；
Second step, liquid phase (spent lye) the progress oil removal to alkali cleaning discharge handle to obtain the spent lye after oil removal is handled, every
Oil slick caused by oil processing is further disposed according to a conventional method；
3rd step, the spent lye after handling oil removal carry out oxidation processes, and oxidant uses air or oxygen, aoxidizes water outlet
Subsequent treatment is carried out using common process, or oxidation water outlet mix with MTO devices other waste water after routinely technique progress is subsequently
Processing.
Spent lye will be discharged during being washed with NaOH solution and auxiliary agent to MTO alkene gas, by spent lye
Oil removal processing, air or oxygen oxidation processes are carried out successively, it is possible to achieve water outlet COD is low less than 4000mg/L, organic nitrogen content
In 100mg/L." the water outlet organic nitrogen content " is equal to water inlet total organic nitrogen content and subtracts water outlet ammonia-nitrogen content.
On the basis of above-mentioned technical proposal, in the first step, the MTO alkene gas containing sour gas is：Contain CO2
MTO alkene gas.
On the basis of above-mentioned technical proposal, in the first step, alkali cleaning processing is carried out in caustic wash tower, and matter is selected in alkali cleaning processing
The fresh NaOH solution that concentration is 5%~10% is measured, the mass concentration of fresh NaOH solution is preferably 6%~8%；
In order to reduce the negative effect that alkali cleaning is brought, especially for reduce butter generation, it is necessary to be used in alkali cleaning
Auxiliary agent, the auxiliary agent are butter inhibitor, such as butter inhibitor HK-1312 (production of Hangzhou chemical institute), and it is amine
The aqueous solution of mixture, the wherein total mass concentration of amine mixture are 48%~52%, the mass concentration of N element for 6%~
7%, the butter inhibitor of the mass concentration of all total mass concentrations for meeting this amine mixture and N element is applied to this hair
It is bright.
On the basis of above-mentioned technical proposal, in the first step, the addition of NaOH solution and the mass ratio of MTO alkene gas
For 1%-2%, preferably 1.2%-1.8%；
In the first step, the addition of auxiliary agent and the mass ratio of MTO alkene gas are 50ppm~200ppm, preferably 80ppm~
150ppm。
On the basis of above-mentioned technical proposal, in second step, using oil partition tank to the spent lye (i.e. " liquid that alkali cleaning is discharged
Phase ") oil removal processing is carried out, wherein, residence time of the spent lye in oil partition tank is at least 2h, preferably 6h~36h.
On the basis of above-mentioned technical proposal, in the 3rd step, oxidizing reaction temperature be 200~300 DEG C, preferably 210~290
℃；Reaction time is 30min~360min, preferably 60min~300min.
On the basis of above-mentioned technical proposal, in the 3rd step, addition and the spent lye COD mass ratios of the air are
10~30, preferably 15~25,
The addition of the oxygen is 1.5~5, preferably 2~4.5 with spent lye COD mass ratios.
The creativeness of the present invention is mainly reflected in the following aspects：
There is notable difference in the composition of the firstth, the composition and traditional cracking ethylene gas of MTO alkene gas, especially sulfur content is bright
Aobvious difference.Due in naphtha often containing the impurity such as hydrogen sulfide, mercaptan, thioether, cracking ethylene gas is carried out alkali cleaning when
Wait, these sulphur-containing substances are also required to remove from cracking ethylene gas.And among MTO alkene gas, it is substantially free of sulphur.Split with tradition
Solution ethylene gas alkaline cleaning procedure is compared, and NaOH solution concentration used in MTO alkene gas alkali cleanings is lower, unit mass gas
The NaOH amounts that alkali cleaning is consumed are less.
Secondth, there is breakthrough to the understanding of promoter effect.When alkali cleaning is carried out to cracking ethylene gas in the past, due to sulphur
Compound is very high to spent lye COD contribution proportion, causes researcher that all main attention is placed in the removing of sulfide, there are no
People carried out concern to the situation of the auxiliary agent in spent lye.The present invention has found by research, in MTO spent lyes, the shadow of auxiliary agent
Sound is vital, and the nitrogen of the high content contained in MTO spent lyes all is from auxiliary agent, organic in MTO spent lyes
It is also mainly to be influenceed by aminated compounds in auxiliary agent be present that thing, which is difficult to biodegradable,.Inventor is on the basis of extensive work
On, make public for the first time the relevant information of auxiliary agent.
3rd, it is difficult to based on the organic matter in MTO spent lyes biodegradable mainly by amine chemical combination in auxiliary agent being present
This understanding of the influence of thing, when handling MTO spent lyes, the present invention not only have selected oxidation technology, and further
Oxidation processes target is placed in the removing of organic nitrogen.Because variform, such as ammonia nitrogen, nitrogen be present in the oxidation product of organic nitrogen
Gas, nitrite nitrogen, nitrate nitrogen etc., in order that handling process is more feasible, the present invention is further oxidation processes target
It is defined as organic nitrogen to be changed into ammonia nitrogen.Using air or oxygen as oxidant, inventor has carried out a large amount of condition tests, obtains
Ideal effect.
The preprocess method of methanol-to-olefins spent lye of the present invention, there is advantages below：
(1) alkali cleaning operation being capable of continuous and steady operation：In the case of other condition identicals, caustic wash tower when not adding auxiliary agent
The cycle of operation be 7d, and after adding 120ppm auxiliary agents, the cycle of operation of caustic wash tower was up to 3 months.
(2) the NaOH amounts that alkali cleaning is consumed are few：Being converted into alkene gas alkali cleaning per ton needs to consume 1kgNaOH.
(3) oxidant is cheap and easy to get.
(4) conversion ratio of organic nitrogen up to more than 80%, and is converted to ammonia nitrogen substantially in spent lye：Reality as described below
Apply the data in example.
(5) water outlet COD is less than 100mg/L less than 4000mg/L, organic nitrogen content after spent lye is oxidation-treated, compares oxygen
Change before processing, in spent lye the biological inhibition effect of organic matter significantly reduce.
It is embodiment below.
Embodiment 1
The fresh NaOH solution and auxiliary agent HK-1312 that use quality concentration is 6% carry out alkali cleaning to MTO alkene gas, wherein
Fresh NaOH solution and the mass ratio of MTO alkene gas are 1.8%, and the mass ratio of auxiliary agent and MTO alkene gas is 80ppm.It is right
After the liquid phase of alkali cleaning discharge carries out the oil removal processing that the residence time is 6h, the COD of spent lye is 5035mg/L, total organic nitrogen content
For 418mg/L.Oxidant is used air as to carry out oxidation processes to the spent lye after oil removal, the addition of wherein air is
10 times of spent lye COD amounts, under conditions of reaction temperature is 300 DEG C, the reaction time is 30min, the COD of water outlet is 520mg/
L, organic nitrogen content is 12mg/L.
Embodiment 2
The fresh NaOH solution and auxiliary agent HK-1312 that use quality concentration is 8% carry out alkali cleaning to MTO alkene gas, wherein
Fresh NaOH solution and the mass ratio of MTO alkene gas are 1.2%, and the mass ratio of auxiliary agent and MTO alkene gas is 150ppm.It is right
After the liquid phase of alkali cleaning discharge carries out the oil removal processing that the residence time is 2h, the COD of spent lye is 9100mg/L, total organic nitrogen content
For 755mg/L.Oxidation processes are carried out to the spent lye after oil removal as oxidant using oxygen, the addition of wherein oxygen is
1.5 times of spent lye COD amounts, under conditions of reaction temperature is 250 DEG C, the reaction time is 120min, the COD of water outlet is
1080mg/L, organic nitrogen content 23mg/L.
Embodiment 3
The fresh NaOH solution and auxiliary agent HK-1312 that use quality concentration is 10% carry out alkali cleaning to MTO alkene gas, wherein
Fresh NaOH solution and the mass ratio of MTO alkene gas are 1%, and the mass ratio of auxiliary agent and MTO alkene gas is 50ppm.To alkali
After the oil removal processing that the liquid phase progress residence time for washing discharge is 36h, the COD of spent lye is 10300mg/L, total organic nitrogen content
For 747mg/L.Oxidant is used air as to carry out oxidation processes to the spent lye after oil removal, the addition of wherein air is
30 times of spent lye COD amounts, under conditions of reaction temperature is 250 DEG C, the reaction time is 60min, the COD of water outlet is
1070mg/L, organic nitrogen content 5mg/L.
Embodiment 4
The fresh NaOH solution and auxiliary agent HK-1312 that use quality concentration is 5% carry out alkali cleaning to MTO alkene gas, wherein
Fresh NaOH solution and the mass ratio of MTO alkene gas are 2%, and the mass ratio of auxiliary agent and MTO alkene gas is 200ppm.To alkali
After the oil removal processing that the liquid phase progress residence time for washing discharge is 24h, the COD of spent lye is 8200mg/L, total organic nitrogen content
For 652mg/L.Oxidation processes are carried out to the spent lye after oil removal as oxidant using oxygen, the addition of wherein oxygen is
5 times of spent lye COD amounts, under conditions of reaction temperature is 200 DEG C, the reaction time is 360min, the COD of water outlet is 980mg/
L, organic nitrogen content is 20mg/L.
The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (6)
1. a kind of preprocess method of methanol-to-olefins spent lye, it is characterised in that comprise the following steps：
The first step, alkali cleaning processing is carried out to the MTO alkene gas containing sour gas, in order to reduce the negative effect that alkali cleaning is brought,
Need to use auxiliary agent in alkali cleaning, the MTO alkene gas after alkali cleaning continues with into subsequent handling；
Second step, carries out the spent lye after oil removal handles to obtain oil removal processing to the liquid phase of alkali cleaning discharge, caused by oil removal processing
Oil slick is further disposed according to a conventional method；
3rd step, the spent lye after handling oil removal carry out oxidation processes, and oxidant uses air or oxygen, and oxidation water outlet uses
Common process carries out subsequent treatment, or oxidation water outlet mixed with MTO devices other waste water after routinely technique progress subsequent treatment；
In the first step, the addition of NaOH solution and the mass ratio of MTO alkene gas are 1%-2%,
In the first step, the addition of auxiliary agent and the mass ratio of MTO alkene gas are 50ppm~200ppm；
The auxiliary agent is the aqueous solution of amine mixture, and wherein the total mass concentration of amine mixture is 48%~52%, N element
Mass concentration be 6%~7%；
Oxidation water outlet organic nitrogen content is less than 100mg/L.
2. the preprocess method of methanol-to-olefins spent lye as claimed in claim 1, it is characterised in that：It is described in the first step
MTO alkene gas containing sour gas is：Contain CO2MTO alkene gas.
3. the preprocess method of methanol-to-olefins spent lye as claimed in claim 1, it is characterised in that：In the first step, alkali cleaning
Processing is from the fresh NaOH solution that mass concentration is 5%~10%.
4. the preprocess method of methanol-to-olefins spent lye as claimed in claim 1, it is characterised in that：In second step, use
The liquid phase that oil partition tank is discharged to alkali cleaning carries out oil removal processing, wherein, residence time of the spent lye in oil partition tank is at least 2h.
5. the preprocess method of methanol-to-olefins spent lye as claimed in claim 1, it is characterised in that：In 3rd step, oxidation
Reaction temperature is 200~300 DEG C；Reaction time is 30min~360min.
6. the preprocess method of methanol-to-olefins spent lye as claimed in claim 1, it is characterised in that：It is described in 3rd step
The addition of air is 10~30 with spent lye COD mass ratios,
The addition of the oxygen is 1.5~5 with spent lye COD mass ratios.
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| US7388120B2 (en) * | 2004-12-06 | 2008-06-17 | Exxonmobil Chemical Patents Inc. | Removing carbon dioxide from an oxygenate to olefins reaction effluent |
| CN101172725A (en) * | 2006-10-31 | 2008-05-07 | 中国石油化工股份有限公司 | Method for processing waste alkali liquid in butyl octanol production |
| EP2566937A2 (en) * | 2010-05-07 | 2013-03-13 | Total Petrochemicals Research Feluy | Use of solvent to decrease caustic scrubber fouling |
| CN102442744B (en) * | 2010-09-30 | 2013-07-03 | 中国石油化工股份有限公司 | Treatment method of high-concentration process waste water during methanol-to-olefin process |
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