CN118437117A - Treatment method of ammonia-containing waste gas - Google Patents
Treatment method of ammonia-containing waste gas Download PDFInfo
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- CN118437117A CN118437117A CN202410597563.7A CN202410597563A CN118437117A CN 118437117 A CN118437117 A CN 118437117A CN 202410597563 A CN202410597563 A CN 202410597563A CN 118437117 A CN118437117 A CN 118437117A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002912 waste gas Substances 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 47
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000010521 absorption reaction Methods 0.000 claims abstract description 32
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 28
- 230000007062 hydrolysis Effects 0.000 claims abstract description 27
- WJRBRSLFGCUECM-UHFFFAOYSA-N hydantoin Chemical compound O=C1CNC(=O)N1 WJRBRSLFGCUECM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229940091173 hydantoin Drugs 0.000 claims abstract description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 23
- 238000005342 ion exchange Methods 0.000 claims abstract description 21
- CLUWOWRTHNNBBU-UHFFFAOYSA-N 3-methylthiopropanal Chemical compound CSCCC=O CLUWOWRTHNNBBU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010865 sewage Substances 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 6
- -1 carbon dioxide methyl mercaptan Chemical compound 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 24
- 239000001569 carbon dioxide Substances 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000003456 ion exchange resin Substances 0.000 claims description 8
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000003729 cation exchange resin Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 8
- FFEARJCKVFRZRR-BYPYZUCNSA-N L-methionine Chemical compound CSCC[C@H](N)C(O)=O FFEARJCKVFRZRR-BYPYZUCNSA-N 0.000 abstract description 7
- 229930182817 methionine Natural products 0.000 abstract description 7
- 230000008929 regeneration Effects 0.000 abstract description 6
- 238000011069 regeneration method Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 abstract description 3
- 235000011130 ammonium sulphate Nutrition 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 150000001413 amino acids Chemical class 0.000 description 5
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 4
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 description 4
- WQOXQRCZOLPYPM-UHFFFAOYSA-N dimethyl disulfide Chemical compound CSSC WQOXQRCZOLPYPM-UHFFFAOYSA-N 0.000 description 4
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000012295 chemical reaction liquid Substances 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical group [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000009615 deamination Effects 0.000 description 2
- 238000006481 deamination reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 235000020776 essential amino acid Nutrition 0.000 description 2
- 239000003797 essential amino acid Substances 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000000413 hydrolysate Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- ONFOSYPQQXJWGS-UHFFFAOYSA-N 2-hydroxy-4-(methylthio)butanoic acid Chemical compound CSCCC(O)C(O)=O ONFOSYPQQXJWGS-UHFFFAOYSA-N 0.000 description 1
- SBKRXUMXMKBCLD-UHFFFAOYSA-N 5-(2-methylsulfanylethyl)imidazolidine-2,4-dione Chemical compound CSCCC1NC(=O)NC1=O SBKRXUMXMKBCLD-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 102000007056 Recombinant Fusion Proteins Human genes 0.000 description 1
- 108010008281 Recombinant Fusion Proteins Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 125000001360 methionine group Chemical group N[C@@H](CCSC)C(=O)* 0.000 description 1
- 150000002742 methionines Chemical class 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The embodiment of the application provides a treatment method of ammonia-containing waste gas, and relates to the field of methionine production. A method for treating an ammonia-containing off-gas, comprising the steps of: hydantoin hydrolysis gas and another strand of raw materials are synthesized into hydantoin; the split hydrolysis gas is transferred into water absorption, ammonia can be absorbed by a spray tower, and the absorbed water is transferred to ion exchange; the water produced by ion exchange enters a sewage treatment process, and the air outlet is combined with water washing air; the water washing gas is transferred into sulfuric acid for washing to further remove ammonia till no ammonia is detected; the pickling gas enters MMP for washing, so that 3-methylthiopropanal and methyl mercaptan generate a thiohemiacetal structure, thereby realizing thorough removal of methyl mercaptan, the content of the removed carbon dioxide methyl mercaptan is low, ammonia and methyl mercaptan in waste gas are respectively converted into ammonium sulfate and MMP by utilizing known chemical properties, and the rest of impurities are dissolved in water for regeneration treatment, so that the method is a treatment scheme integrating atomic economy and energy economy.
Description
Technical Field
The application relates to the technical field of methionine production, in particular to a method for treating ammonia-containing waste gas.
Background
Methionine, also known as methionine, is one of the basic units of a biosynthetic protein and is also an essential amino acid and a limiting amino acid. Met is the only sulfur-containing amino acid in the essential amino acid, and the animal can obviously promote growth by taking a small amount of amino acid, shorten the feeding period, increase the egg and milk yield, and if the intake is insufficient, the utilization of other amino acids in the body is insufficient, the unused amino acid is converted into energy molecules and urea through deamination, and the burden of livers and kidneys is increased. Methionine is widely used in the fields of feed, medicine, food, cosmetics and the like. Methionine is obtained by Burcherer-Burgs reaction, and 3-methylthiopropanal, hydrocyanic acid, ammonia and carbon dioxide are used as raw materials to synthesize 5- (beta-methylthioethyl) hydantoin, also can be called hydantoin or hydantoin for short. The hydantoin is hydrolyzed by alkali to obtain hydrolysate of mixture of methionine salt and carbonate. Acidifying the hydrolysate to obtain methionine and filtrate, wherein the filtrate contains a large amount of useful components, and the useful components are required to be recycled after treatment; the difference in acidifying medium and base determines the difference in the return link of the filtrate, which is either returned to the hydrolysis of hydantoin or to the crystallization step.
In hydantoin synthesis and hydrolysis reaction, the introduced and produced impurities may include methyl mercaptan, dimethyl disulfide, methanol, allyl alcohol, acrylic acid, polymer, acrolein, formic acid, 2-hydroxy-4-methylthiobutanoic acid, hydrolysis product of hydrocyanic acid polymer, etc., and a large amount of unknown harmful impurities are continuously enriched in the system in circulation process of ammonia and carbon dioxide, so as to ensure smooth production, balance of impurities can be maintained for a part of ammonia and carbon dioxide which are transferred out, the transferred part can be subjected to incineration treatment, the calorific value of the part of waste gas is lower, the gas needs to be introduced, the tail gas needs to be subjected to desulfurization and denitrification treatment, the influence on the service life of a hearth pipeline is larger, and the incineration scheme has larger requirements on energy consumption and material consumption.
Disclosure of Invention
The application aims at least solving one of the technical problems of the prior art that the alkaline potassium hydrolyzes the hydantoin for subsequent treatment. Therefore, the application provides a treatment method of ammonia-containing waste gas, which is characterized in that the hydantoin hydrolysis gas carries impurities which accumulate to cause hydantoin synthesis and hydrolysis abnormality, partial transfer-out treatment is needed, water absorption, acid absorption and MMP absorption are used for removing ammonia, deep deamination and methyl mercaptan respectively for the transferred hydantoin hydrolysis gas, and the cleaned carbon dioxide is recycled.
According to an embodiment of the application, a method for treating ammonia-containing waste gas comprises the following steps:
step 1, hydantoin hydrolysis gas, namely gaseous materials generated by hydrolysis and steam stripping of hydantoin by using alkali liquor, and synthesizing hydantoin by the material and another material;
Step 2, diverting the hydrolysis gas and transferring the hydrolysis gas into water absorption, wherein the water absorption can be carried out by using a spray tower to absorb ammonia, and the absorption water is transferred to ion exchange;
step 3, the water produced by ion exchange enters a sewage treatment procedure, and the outlet air is mixed with water washing air;
step 4, transferring the water washing gas into sulfuric acid for washing to further remove ammonia till the ammonia is not detected;
And 5, washing the pickling gas in MMP to enable the 3-methylthiopropanal and the methyl mercaptan to generate a thio-hemiacetal structure, so that the methyl mercaptan is thoroughly removed, and the removed carbon dioxide methyl mercaptan has lower content.
According to some embodiments of the application, in step2, the split hydrolysis gas phase is absorbed by using 3-methylthiopropanal reaction liquid, and the absorbed gas phase is carbon dioxide with higher purity.
According to some embodiments of the application, in step 2, the absorption liquid is transferred into ion exchange resin in the ion exchange process, and the resin is regenerated and resolved by sulfuric acid after adsorption saturation.
According to some embodiments of the application, in step 1, the hydantoin hydrolysis gas temperature is 120-160 ℃, and the water absorption temperature is controlled to be 30-70 ℃ in order to ensure the absorption of ammonia.
According to some embodiments of the application, in step 2, the absorption liquid is adsorbed by cation exchange resin, and in order to reduce the amount of the ion exchange effluent, the ion exchange effluent returns to water absorption, and the ion exchange effluent is diverted for sewage treatment.
In step 4, the effluent gas is further absorbed using sulfuric acid solution in order to further reduce the ammonia content of the effluent gas, according to some embodiments of the present application.
According to some embodiments of the application, in step 5, the waste gas after acid washing is chemisorbed using a reaction solution of 3-methylthiopropanal to produce a thiohemiacetal structure.
The beneficial effects of the application are as follows: according to the application, ammonia and methyl mercaptan in the waste gas are respectively converted into ammonium sulfate and MMP by utilizing known chemical properties, and other impurities are dissolved in water for regeneration treatment, so that the method is a treatment scheme integrating atomic economy and energy economy, and the requirements of energy consumption and material consumption are reduced without introducing fuel gas for burning.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the steps of the present application;
fig. 2 is a schematic flow chart of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
A method of treating an ammonia-containing off-gas according to an embodiment of the present application is described below with reference to the accompanying drawings.
As shown in fig. 1-2, a method for treating an ammonia-containing exhaust gas according to an embodiment of the present application includes the steps of:
step 1, hydantoin hydrolysis gas, namely gaseous materials generated by hydrolysis and steam stripping of hydantoin by using alkali liquor, and synthesizing hydantoin by the material and another material;
Step 2, diverting the hydrolysis gas and transferring the hydrolysis gas into water absorption, wherein the water absorption can be carried out by using a spray tower to absorb ammonia, and the absorption water is transferred to ion exchange;
step 3, the water produced by ion exchange enters a sewage treatment procedure, and the outlet air is mixed with water washing air;
step 4, transferring the water washing gas into sulfuric acid for washing to further remove ammonia till the ammonia is not detected;
And 5, washing the pickling gas in MMP to enable the 3-methylthiopropanal and the methyl mercaptan to generate a thio-hemiacetal structure, so that the methyl mercaptan is thoroughly removed, and the removed carbon dioxide methyl mercaptan has lower content.
In the step 2, the split hydrolysis gas phase is absorbed by using 3-methylthiopropanal reaction liquid, and the absorbed gas phase is carbon dioxide with higher purity and can be returned for use.
In the step 2, the absorption liquid is transferred into ion exchange resin in the ion exchange process, and the resin is regenerated and analyzed by sulfuric acid after being adsorbed and saturated.
In the step 1, the temperature of the hydantoin hydrolysis gas is 120-160 ℃, the water absorption temperature is controlled to be 30-70 ℃ for ensuring the absorption of ammonia, and the ammonia content of the aqueous solution is preferably 3-8 wt%.
In the step 2, the absorption liquid is adsorbed by cation exchange resin, in order to reduce the amount of the ion exchange effluent, the ion exchange effluent returns to water absorption until COD (chemical oxygen demand) of the ion exchange effluent is more than 1000ppm, the ion exchange effluent is transferred out to carry out sewage treatment by using a known process, and the cation exchange resin can be D001, D002 and D113.
In step 4, in order to further reduce the ammonia content of the exhaust gas, the exhaust gas is further absorbed by using a sulfuric acid solution, and the sulfuric acid absorption solution is preferably used for carrying out regeneration analysis on ion exchange resin, wherein the concentration of the sulfuric acid solution is 3-10wt%.
In the step 5, the beneficial components of the waste gas after pickling are carbon dioxide and methyl mercaptan, and the methyl mercaptan is chemically adsorbed by using a reaction liquid of 3-methylthio propanal to generate a thio-hemiacetal structure, so that the adsorption efficiency of the methyl mercaptan is ensured, and the molar ratio of the 3-methylthio propanal to the methyl mercaptan in the absorption liquid is 1:0.05-0.3.
The invention relates to a method for treating ammonia-containing waste gas, which converts ammonia and methyl mercaptan in the waste gas into ammonium sulfate and MMP respectively by utilizing known chemical properties, and the rest of impurities are dissolved in water for regeneration treatment, thus being a treatment scheme integrating atomic economy and energy economy.
Examples
Step 1: hydantoin hydrolysis gas, wherein the carbon dioxide is about 23wt%, the ammonia is about 13wt%, the water vapor is about 60wt%, and the carried impurities comprise methyl mercaptan 0.5wt%, dimethyl disulfide 0.05wt%, methanol 1wt%, allyl alcohol, acrylic acid, polymer, acrolein, and formic acid 0.2wt%.
Step 2: the split flow of 0.5-5 v/v% is transferred to water absorption, the water absorption temperature is controlled to be 30-70 ℃, the ammonia content is controlled to be 3-8 wt%, the split flow hydantoin hydrolysis gas volume is reduced by more than 90%, and the water washing liquid is transferred to hydrogen ion exchange resin and then transferred to sewage treatment.
Step 3: the hydrogen ion exchange resin is regenerated by using pickling solution after adsorption saturation, and D001, D002 and D113 can be used as hydrogen cation exchange resin.
Step 4: the carbon dioxide generated by the regeneration of the ion exchange resin is added into water for washing gas and then is transferred into acid washing, the temperature of the acid washing is controlled to be 30-50 ℃, the residual ammonia is further removed, the acid washing liquid is used for the regeneration of the ion exchange resin, and at the moment, the carbon dioxide content in the waste gas is 91wt%, the methyl mercaptan content is 2.3wt%, and the balance is water vapor and the like.
Step 5: the acid gas used 3-methylthiopropanal to methyl mercaptan was 1: the MMP reaction solution of 0.05-0.3 is washed at 30-40 ℃ to control the methyl mercaptan content below 0.001wt%, and the carbon dioxide content is above 99.5 wt%.
The above embodiments of the present application are only examples, and are not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (7)
1. A method for treating an ammonia-containing off-gas, comprising the steps of:
step 1, hydantoin hydrolysis gas, namely gaseous materials generated by hydrolysis and steam stripping of hydantoin by using alkali liquor, and synthesizing hydantoin by the material and another material;
Step 2, diverting the hydrolysis gas and transferring the hydrolysis gas into water absorption, wherein the water absorption can be carried out by using a spray tower to absorb ammonia, and the absorption water is transferred to ion exchange;
step 3, the water produced by ion exchange enters a sewage treatment procedure, and the outlet air is mixed with water washing air;
step 4, transferring the water washing gas into sulfuric acid for washing to further remove ammonia till the ammonia is not detected;
And 5, washing the pickling gas in MMP to enable the 3-methylthiopropanal and the methyl mercaptan to generate a thio-hemiacetal structure, so that the methyl mercaptan is thoroughly removed, and the removed carbon dioxide methyl mercaptan has lower content.
2. The method for treating an ammonia-containing waste gas according to claim 1, wherein in step 2, the split hydrolysis gas phase is absorbed by using a 3-methylthiopropanal reaction solution, and the absorbed gas phase is carbon dioxide having a high purity.
3. The method for treating ammonia-containing waste gas according to claim 1, wherein in step 2, the absorption liquid is transferred to an ion exchange resin during the ion exchange process, and the resin is regenerated and analyzed by sulfuric acid after adsorption saturation.
4. The method for treating an ammonia-containing waste gas according to claim 1, wherein in step 1, the hydantoin hydrolysis gas temperature is 120 to 160 ℃, and the water absorption temperature is controlled to 30 to 70 ℃ in order to ensure the absorption of ammonia.
5. The method according to claim 1, wherein in step 2, the absorption liquid is adsorbed by cation exchange resin, and the ion exchange water is returned to the water absorption, and the ion exchange water is diverted to the sewage treatment to reduce the amount of the ion exchange effluent.
6. The method for treating an ammonia-containing off-gas according to claim 1, wherein in step 4, the off-gas is further absorbed by a sulfuric acid solution in order to further reduce the ammonia content of the off-gas.
7. The method for treating an ammonia-containing waste gas according to claim 1, wherein in step 5, the waste gas after the acid washing is chemically adsorbed by using a reaction solution of 3-methylthiopropanal to produce a thiohemiacetal structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410597563.7A CN118437117A (en) | 2024-05-14 | 2024-05-14 | Treatment method of ammonia-containing waste gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410597563.7A CN118437117A (en) | 2024-05-14 | 2024-05-14 | Treatment method of ammonia-containing waste gas |
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