CN107641069B - Treatment method of methanol-to-olefin product gas - Google Patents
Treatment method of methanol-to-olefin product gas Download PDFInfo
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- CN107641069B CN107641069B CN201710884116.XA CN201710884116A CN107641069B CN 107641069 B CN107641069 B CN 107641069B CN 201710884116 A CN201710884116 A CN 201710884116A CN 107641069 B CN107641069 B CN 107641069B
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- 238000000034 method Methods 0.000 title claims abstract description 47
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims abstract description 130
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 76
- 238000005406 washing Methods 0.000 claims abstract description 28
- 239000003513 alkali Substances 0.000 claims abstract description 24
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 99
- 150000001336 alkenes Chemical class 0.000 claims description 30
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 27
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 24
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 22
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 claims description 5
- 235000010259 potassium hydrogen sulphite Nutrition 0.000 claims description 3
- GRWZHXKQBITJKP-UHFFFAOYSA-N dithionous acid Chemical compound OS(=O)S(O)=O GRWZHXKQBITJKP-UHFFFAOYSA-N 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 24
- 235000014121 butter Nutrition 0.000 abstract description 11
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 abstract description 5
- 238000007259 addition reaction Methods 0.000 abstract description 4
- 238000003672 processing method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 78
- 239000000047 product Substances 0.000 description 52
- 239000012495 reaction gas Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010117 shenhua Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
Images
Classifications
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/40—Ethylene production
Abstract
The application provides a treatment method of methanol-to-olefin product gas. The processing method comprises the following steps: step S1, removing acetaldehyde in the methanol-to-olefin product gas by using a bisulfite solution; and step S2, performing an alkali washing process on the methanol-to-olefin product gas treated in the step S1, and performing addition reaction on bisulfite in a bisulfite absorption bottle and acetaldehyde to remove acetaldehyde, so as to prevent the acetaldehyde from reacting with alkali liquor to generate butter in the alkali washing process, thereby ensuring the good and smooth operation of an alkali washing device.
Description
Technical Field
The application relates to the field of chemical industry, in particular to a treatment method of methanol-to-olefin product gas.
Background
Shenhua baotou coal chemical industry is a demonstration project for preparing olefin from national-grade coal. Methanol To Olefins (MTO) is a link to methanol processes and olefin separation processes. Some side reactions occur while methanol is used to prepare olefins, and byproducts such as carbon dioxide are generated. In order to reduce the influence of carbon dioxide on products and equipment, a caustic washing device is specially arranged in a device for preparing olefin from methanol. However, grease is generated in the operation process, so that the pressure difference of the alkaline washing tower is increased, the alkaline washing efficiency is reduced, and the load of the alkaline washing tower is influenced; the subsequent waste alkali treatment is also greatly influenced.
Therefore, a method for solving the problem of the butter is found, and the method has important significance for smooth operation of the device.
Disclosure of Invention
The application mainly aims to provide a treatment method of methanol-to-olefin product gas, so as to solve the problem that butter in an alkaline washing device in the prior art causes the problem that a follow-up device cannot work normally.
In order to achieve the above object, the present application provides a method for treating a methanol-to-olefin product gas, comprising: step S1, removing acetaldehyde in the methanol-to-olefin product gas by using a bisulfite solution; step S2, performing an alkali washing process on the methanol to olefin product gas processed in the step S1.
Further, the step S1 includes a process of continuously removing acetaldehyde from the methanol to olefin product gas N times by using the bisulfite solution, where the bisulfite solution used in the process of removing acetaldehyde X times is an X-th bisulfite solution, the bisulfite solution used in the process of removing acetaldehyde from the methanol to olefin product gas X +1 times is an X + 1-th bisulfite solution, a concentration of bisulfite in the X-th bisulfite solution is a, a concentration of bisulfite in the X + 1-th bisulfite solution is B, where B > a, X < N, and N is greater than or equal to 2.
Further, the step S1 includes: step S11, removing acetaldehyde in the methanol-to-olefin product gas by using a first bisulfite solution to obtain a first product gas; step S12, removing acetaldehyde in the first product gas by using a second bisulfite solution to obtain a second product gas; and step S13, removing acetaldehyde in the second product gas by using a third hydrosulfite solution.
Further, in the first bisulfite solution, the bisulfite has a mass concentration of 5%.
Further, in the second bisulfite solution, the bisulfite has a mass concentration of 10%.
Further, in the third hydrosulfite solution, the concentration of the hydrosulfite salt is 20% by mass.
Further, in the bisulfite solution used in step S1, the mass concentration of the bisulfite is 5 to 30%.
Further, the above bisulfite solution is selected from a sodium bisulfite solution and/or a potassium bisulfite solution.
Further, the bisulfite solution is a sodium bisulfite solution.
By applying the technical scheme of the application, the addition reaction of the bisulfite in the bisulfite absorption bottle and the acetaldehyde occurs:
the alpha-hydroxy sulfonate is generated, namely, the acetaldehyde in the methanol-to-olefin product gas can be removed by adopting the hydrogen sulfate solution, so that the acetaldehyde is prevented from reacting with alkali liquor to generate butter in the alkali washing process, and the good and smooth operation of an alkali washing device is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 illustrates a schematic flow diagram of a methanol to olefins product gas processing method provided in accordance with an exemplary embodiment of the present application;
FIG. 2 shows a chromatogram from analysis of a methanol to olefin product gas prior to an acetaldehyde removal process using a lowox chromatography column;
FIG. 3 shows a chromatogram from analysis of a methanol to olefin product gas prior to an acetaldehyde removal process using a Plot Q column method;
FIG. 4 shows a chromatogram of the gas after the acetaldehyde removal process in example 1;
FIG. 5 shows a chromatogram of the gas after the tertiary acetaldehyde removal process in example 2;
FIG. 6 shows a chromatogram of the gas after the tertiary acetaldehyde removal process in example 3; and
fig. 7 shows a chromatogram of the methanol to olefin reaction gas after the water washing process in the comparative example.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, grease in the alkaline washing device in the prior art causes the grease and the subsequent devices to be incapable of working normally, and in order to solve the technical problems, the application provides a method for treating methanol-to-olefin product gas.
The applicant analyzes the methanol-to-olefin product gas to obtain the gas components, and according to the mechanism of butter generation, the gas source of the butter should be oxygen-containing gas, so that the reaction of the corresponding oxygen-containing gas in the methanol-to-olefin product gas with alkali liquor finds that only acetaldehyde reacts with the alkali liquor to generate oily precipitate, so that the butter source in the methanol-to-olefin product gas is acetaldehyde, and therefore, the acetaldehyde in the methanol-to-olefin product gas before alkaline washing needs to be removed in order to avoid the generation of a large amount of butter.
In an exemplary embodiment of the present application, a method for processing a methanol to olefin product gas is provided, as shown in fig. 1, the method comprising: step S1, removing acetaldehyde in the methanol-to-olefin product gas by using a bisulfite solution; step S2, performing an alkali washing process on the methanol to olefin product gas processed in the step S1.
In the above treatment method, the bisulfite in the bisulfite absorption bottle undergoes an addition reaction with acetaldehyde:
the alpha-hydroxy sulfonate is generated, namely, the acetaldehyde in the methanol-to-olefin product gas can be removed by adopting the hydrogen sulfate solution, so that the acetaldehyde is prevented from reacting with alkali liquor to generate butter in the alkali washing process, and the good and smooth operation of an alkali washing device is ensured.
In order to further remove acetaldehyde, the step S1 includes a process of continuously removing acetaldehyde from the methanol to olefin product gas N times by using the bisulfite solution, where the bisulfite solution used in the process of removing acetaldehyde X times is an X-th bisulfite solution, the bisulfite solution used in the process of removing acetaldehyde from the methanol to olefin product gas X +1 times is an X + 1-th bisulfite solution, a concentration of bisulfite in the X-th bisulfite solution is a, a concentration of bisulfite in the X + 1-th bisulfite solution is B, and B > a, and X < N, N being greater than or equal to 2. The concentration is gradually increased, and the more completely the bisulfite reacts with the acetaldehyde in the gas, the more effectively the acetaldehyde in the gas can be removed.
In the present application, the term "concentration" refers to a mass concentration unless otherwise specified.
In an embodiment of the present application, the step S1 includes: step S11, removing acetaldehyde in the methanol-to-olefin product gas by using a first bisulfite solution to obtain a first product gas; step S12, removing acetaldehyde in the first product gas by using a second bisulfite solution to obtain a second product gas; and step S13, removing acetaldehyde in the second product gas by using a third hydrosulfite solution. Therefore, more acetaldehyde in the methanol-to-olefin product gas can be removed, and the generation of a large amount of butter is avoided.
In order to remove more acetaldehyde, in one embodiment of the present application, the first bisulfite solution has a bisulfite concentration of 5% by mass.
In another embodiment of the present application, the second bisulfite solution has a bisulfite concentration of 10% by mass.
In order to remove acetaldehyde for the third time, in one embodiment of the present application, the third hydrosulfite solution contains bisulfite at a concentration of 20% by mass.
In still another embodiment of the present application, in the bisulfite solution used in step S1, the mass concentration of the bisulfite is 5 to 30%. The concentration can not only effectively remove acetaldehyde in the methanol-to-olefin product gas, but also avoid waste of alkali liquor.
In one embodiment of the present application, the bisulfite solution is selected from a sodium bisulfite solution and/or a potassium bisulfite solution, which not only can remove acetaldehyde well, but also can avoid reacting with other gases in the methanol to olefin reaction gas.
However, the above-mentioned bisulfite solutions are not limited to the above-mentioned two, and those skilled in the art can select an appropriate bisulfite solution according to the actual situation.
In another embodiment of the present application, the bisulfite solution is a sodium bisulfite solution, which can react with acetaldehyde and does not react with other gases in the methanol to olefin product gas, so as to ensure that other gas components in the methanol to olefin product gas are not affected.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described below with reference to specific embodiments.
Example 1
In the treatment process of preparing olefin product gas from methanol, firstly, a 5% sodium bisulfite solution is adopted to react with the product gas for 10min, and the reacted gas enters an alkali washing process.
Example 2
The methanol to olefin product gas to be treated is the same as in the example, and the difference of the treatment process from the example 1 is that firstly, a sodium bisulfite solution with the concentration of 5 percent is adopted to react with the methanol to olefin product gas for 10 min; then, reacting the sodium bisulfite solution with the concentration of 10 percent with the methanol-to-olefin product gas for 10 min; and finally, reacting the sodium bisulfite solution with the concentration of 20 percent with the methanol to olefin product gas for 10 min. The reacted gas enters the alkali washing process again.
Example 3
The methanol to olefin product gas to be treated is the same as the example, and the difference of the treatment process and the example 1 is that firstly, sodium bisulfite solution with the concentration of 20 percent is adopted to react with the methanol to olefin product gas for 10 min; then, reacting the sodium bisulfite solution with the concentration of 10 percent with the methanol-to-olefin product gas for 10 min; and finally, reacting the sodium bisulfite solution with the concentration of 5 percent with the methanol to olefin product gas for 10 min. The reacted gas enters the alkali washing process again.
Comparative example
The methanol to olefin product gas to be treated is the same as the embodiment, and the difference of the treatment process and the embodiment 1 is as follows: in the treatment process of the methanol-to-olefin product gas, a water washing process is firstly carried out, and then the gas after the water washing process is directly treated by an alkali washing process.
The gas chromatograph is used for carrying out chromatographic analysis on the methanol to olefin product gas to be treated, the gas treated by the sodium bisulfite solution in the examples 1 to 3 and the gas subjected to the water washing process in the proportion. Fig. 2 to 7 are obtained. In fig. 2 to 7, the abscissa indicates retention time in min, and the ordinate indicates the magnitude of response voltage in μ V × 103. In particular to a lowox chromatographic column method or a Plot Q chromatographic column method. In which fig. 2, 4 and 7 are gas chromatograms obtained by the lowox column method, and fig. 3, 5 and 6 are gas chromatograms obtained by the Plot Q column method. In these figures, the acetaldehyde peak positions are shown in the retention time, and the acetaldehyde peak is about 4.8min for the gas chromatogram obtained by the lowox column method, and the acetaldehyde peak is about 14.4min for the gas chromatogram obtained by the Plot Q column method.
Comparing fig. 4, 5 and 6 with fig. 3, respectively, and fig. 7 with fig. 2, it can be seen from the comparison that the ordinate at 4.8min in fig. 7 is smaller than that in fig. 2, but the ordinate at 14.4min in fig. 5 and 6 is larger, that is, the water washing process of the comparative example can remove a part of acetaldehyde, but the removal effect is poor, while most of acetaldehyde can be removed by using the sodium bisulfite solution in examples 1 to 3. As can be seen from comparison of fig. 4, 5, and 6 with fig. 3, respectively, in the reaction gas before and after acetaldehyde is absorbed by the sodium bisulfite solution, the hydrocarbon components are not changed, but acetaldehyde is greatly reduced and methanol is slightly reduced, which further proves that the absorption of the sodium bisulfite solution has no influence on the hydrocarbon components in the reaction gas, and the peak value of acetaldehyde in fig. 5 is smaller than those in fig. 4 and 6, that is, acetaldehyde is removed by the bisulfite solution for a plurality of times and the bisulfite solution is gradually increased, so that the obtained acetaldehyde removal effect is better.
Gas components before and after the absorption of the sodium bisulfite solution in example 1, gas components before and after the absorption of the third sodium bisulfite solution in example 2, and gas components before and after the absorption of the third sodium bisulfite solution in example 3 were obtained by gas chromatography analysis, which is specifically shown in tables 1 to 3.
TABLE 1
TABLE 2
| Composition of | MTO reaction gas before absorption | MTO reaction gas after absorption |
| Permanent gas (%) | 5.16 | 5.16 |
| Methane (%) | 4.57 | 4.58 |
| Ethylene (%) | 45.80 | 45.93 |
| Ethane (%) | 0.78 | 0.78 |
| Propylene (%) | 31.38 | 31.48 |
| Propane (%) | 2.08 | 2.08 |
| Dimethyl ether (ppm) | 172 | 161 |
| Methanol (ppm) | 288 | 19 |
| C4(％) | 7.41 | 7.40 |
| C5+(％) | 2.55 | 2.56 |
| Acetaldehyde (ppm) | 2219 | 1 |
| Acetylene (ppm) | 4 | 4 |
TABLE 3
As can be seen from the data in Table 1, the contents of ethylene and propylene, which are main reaction products of the reaction gas after absorption, are increased by comparing the compositions of the reaction gas before and after absorption in the sodium bisulfite solution, and conversely, the acetaldehyde content is reduced from 2087ppm before absorption to 136ppm after absorption, the acetaldehyde absorption rate reaches 93.48%, and the methanol content due to the presence of water is also reduced. As can be seen from the data in Table 2, the above table shows that the contents of ethylene and propylene, which are main reaction products of the reaction gas after absorption, are increased by comparing the compositions of the reaction gas before and after absorption by the sodium bisulfite solution, and conversely, the acetaldehyde content is reduced from 2219ppm before absorption to 1ppm after absorption, the acetaldehyde absorption rate reaches 99.9%, and the methanol content due to the presence of water is also reduced. The data in table 3 show that the contents of ethylene and propylene, which are main reaction products of the reaction gas after absorption, are increased, and conversely, the acetaldehyde content is reduced from 2219ppm before absorption to 80ppm after absorption, and the acetaldehyde absorption rate reaches 96.39%, and the comparison of tables 1, 2 and 3 shows that the removal effect of acetaldehyde is better in examples 2 and 3 because the reaction gas is treated by sodium bisulfite solution for multiple times, and the removal effect of acetaldehyde is better in example 2 because the concentrations of the sodium bisulfite solution adopted for multiple times are sequentially increased.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
in the treatment method of the present application, the bisulfite in the bisulfite absorption bottle undergoes an addition reaction with acetaldehyde:
the alpha-hydroxy sulfonate is generated, namely, the acetaldehyde in the methanol-to-olefin product gas can be removed by adopting the hydrogen sulfate solution, so that the acetaldehyde is prevented from reacting with alkali liquor to generate butter in the alkali washing process, and the good and smooth operation of an alkali washing device is ensured.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A treatment method of methanol-to-olefin product gas is characterized by comprising the following steps:
step S1, removing acetaldehyde in the methanol-to-olefin product gas by using a bisulfite solution; and
step S2, performing an alkali washing process on the methanol-to-olefin product gas treated in the step S1,
the step S1 includes continuously removing acetaldehyde in the methanol to olefin product gas by using the bisulfite solution N times, where the bisulfite solution used in the process of removing acetaldehyde X times is an X-th bisulfite solution, the bisulfite solution used in the process of removing acetaldehyde in the methanol to olefin product gas X +1 times is an X + 1-th bisulfite solution, the concentration of bisulfite in the X-th bisulfite solution is A, the concentration of bisulfite in the X + 1-th bisulfite solution is B, and B > A, and X < N, where N is greater than or equal to 2,
the step S1 includes:
step S11, removing acetaldehyde in the methanol-to-olefin product gas by using a first bisulfite solution to obtain a first product gas;
step S12, removing acetaldehyde in the first product gas by using a second bisulfite solution to obtain a second product gas; and
and step S13, removing acetaldehyde in the second product gas by adopting a third hydrosulfite solution.
2. The treatment method according to claim 1, wherein the bisulfite concentration in the first bisulfite solution is 5% by mass.
3. The treatment method according to claim 1, wherein the second bisulfite solution has a concentration of bisulfite of 10% by mass.
4. The treatment method according to claim 1, wherein the third hydrosulphite solution has a concentration of the bisulphite of 20% by mass.
5. The treatment method according to claim 1, wherein in the bisulfite solution used in step S1, the mass concentration of the bisulfite is between 5 and 30%.
6. The treatment process according to claim 1, characterized in that the bisulfite solution is selected from a sodium bisulfite solution and/or a potassium bisulfite solution.
7. The treatment process according to claim 1, characterized in that the bisulfite solution is a sodium bisulfite solution.
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