CN114042434A - A kind of tail gas desulfurizer for rotary kiln and preparation method thereof - Google Patents
A kind of tail gas desulfurizer for rotary kiln and preparation method thereof Download PDFInfo
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- CN114042434A CN114042434A CN202111186903.XA CN202111186903A CN114042434A CN 114042434 A CN114042434 A CN 114042434A CN 202111186903 A CN202111186903 A CN 202111186903A CN 114042434 A CN114042434 A CN 114042434A
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- rotary kiln
- tail gas
- activated carbon
- polystyrene
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000004793 Polystyrene Substances 0.000 claims abstract description 37
- 229920002223 polystyrene Polymers 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 150000003839 salts Chemical class 0.000 claims abstract description 24
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 22
- 230000023556 desulfurization Effects 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000007822 coupling agent Substances 0.000 claims abstract description 16
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 15
- 239000003999 initiator Substances 0.000 claims abstract description 15
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 10
- 239000001509 sodium citrate Substances 0.000 claims abstract description 10
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003002 pH adjusting agent Substances 0.000 claims abstract 3
- 239000002994 raw material Substances 0.000 claims abstract 2
- 239000007789 gas Substances 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 34
- 229910021645 metal ion Inorganic materials 0.000 claims description 31
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 21
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 15
- 239000004005 microsphere Substances 0.000 claims description 15
- 238000002791 soaking Methods 0.000 claims description 15
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical group CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 14
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 238000009210 therapy by ultrasound Methods 0.000 claims description 12
- 230000004913 activation Effects 0.000 claims description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000003009 desulfurizing effect Effects 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 8
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 235000021355 Stearic acid Nutrition 0.000 claims description 7
- 229960000583 acetic acid Drugs 0.000 claims description 7
- 239000012362 glacial acetic acid Substances 0.000 claims description 7
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 7
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229950008882 polysorbate Drugs 0.000 claims description 7
- 229920000136 polysorbate Polymers 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 239000008117 stearic acid Substances 0.000 claims description 7
- 239000011592 zinc chloride Substances 0.000 claims description 7
- 235000005074 zinc chloride Nutrition 0.000 claims description 7
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 6
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical group CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 6
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 6
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 6
- MVFCKEFYUDZOCX-UHFFFAOYSA-N iron(2+);dinitrate Chemical compound [Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MVFCKEFYUDZOCX-UHFFFAOYSA-N 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 10
- 150000003568 thioethers Chemical class 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 3
- 125000000524 functional group Chemical group 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 14
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000003213 activating effect Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
一种用于回转窑的尾气脱硫剂及其制备方法，涉及脱硫剂技术领域；原料包括如下质量份计的组分：聚苯乙烯，活性炭，金属盐，柠檬酸钠，水玻璃份；偶联剂，乳化剂，引发剂，pH调节剂。本发明的一种用于回转窑的尾气脱硫剂，通过活性炭中负载聚苯乙烯和金属盐，能明显挺高吸附量，脱硫效果佳。活性炭‑聚苯乙烯复合材料的有机官能团能有效吸附硫化物，金属盐利用的高比表面积的活性炭作为负载与硫化物充分接触，实现硫化物的化学置换，提高脱硫效果。本发明的一种用于回转窑的尾气脱硫剂的制备方法，能制备高吸附量、脱硫效果佳的脱硫剂。A tail gas desulfurizer used in a rotary kiln and a preparation method thereof relate to the technical field of desulfurizers; the raw materials include the following components in parts by mass: polystyrene, activated carbon, metal salts, sodium citrate, and parts of water glass; coupling agent, emulsifier, initiator, pH adjuster. The tail gas desulfurization agent used in the rotary kiln of the present invention can obviously have a high adsorption capacity and good desulfurization effect by loading polystyrene and metal salts in the activated carbon. The organic functional groups of the activated carbon-polystyrene composite material can effectively adsorb sulfides, and the activated carbon with high specific surface area used by the metal salts is used as a load to fully contact the sulfides to realize the chemical replacement of the sulfides and improve the desulfurization effect. The preparation method of the tail gas desulfurization agent used in the rotary kiln of the present invention can prepare the desulfurization agent with high adsorption capacity and good desulfurization effect.
Description
Technical Field
The invention belongs to the field of desulfurizer, and particularly relates to a tail gas desulfurizer for a rotary kiln and a preparation method thereof.
Background
The tail gas generated after the burning of the rotary kiln contains a large amount of sulfide, and the direct emission of the sulfide seriously pollutes the ecological environment and harms the human health, so that a desulfurizer is required to purify the tail gas. When metal oxide is used as a desulfurizing agent, metal sulfide precipitate and water are formed, the oxygen atoms on the surface of the metal oxide precipitate and water are replaced to degrade the desulfurizing agent to form a sulfur-containing surface, and the formation of the sulfur-containing surface in the desulfurizing process can cause H2The dissociation activation energy barrier on the surface of the S desulfurizer is increased, and the desulfurization effect is reduced; the active carbon as a desulfurizing agent has the characteristics of large specific surface area and developed void structure, but has lower adsorption capacity and low selectivity. The tail gas of the rotary kiln contains sulfide and also contains a great amount of smoke dust, and the desulfurization effect of the activated carbon is poor. Therefore, it is an important research direction in the present stage to research a desulfurizing agent having excellent desulfurization performance with respect to the exhaust gas of the rotary kiln.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the tail gas desulfurizer for the rotary kiln, which has large adsorption capacity, effectively removes sulfides and has good desulfurization effect.
The second purpose of the invention is to provide a preparation method of the tail gas desulfurizer for the rotary kiln.
One of the purposes of the invention is realized by adopting the following technical scheme:
a tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
further, the metal salt is two or more of magnesium nitrate, ferric nitrate, cobalt nitrate, nickel nitrate and zinc chloride. By passingThe collocation of various metal salts can effectively reduce H2The activation energy of S dissociation on the surface of the desulfurizer is beneficial to the desulfurization process.
Further, the coupling agent is vinyltriethoxysilane and/or vinyltrimethoxysilane.
Further, the emulsifier is composed of stearic acid and polysorbate in a mass ratio of 1: 0.8-1.2.
Further, the initiator is potassium persulfate and/or sodium persulfate.
Further, the pH regulator is glacial acetic acid.
Further, the calcium carbonate-activated carbon composite material also comprises calcium carbonate, wherein the mass ratio of the calcium carbonate to the activated carbon is 1: 10-20. On one hand, the calcium carbonate has good desulfurization effect, and on the other hand, the calcium carbonate and the activated carbon can effectively reduce agglomeration and bonding and reduce the phenomenon of agglomeration in a reasonable proportion.
Further, the polystyrene has a microsphere structure, and the particle size of the polystyrene is 10-100 nm.
The second purpose of the invention is realized by adopting the following technical scheme:
a preparation method of a tail gas desulfurizer for a rotary kiln comprises the following steps:
s1, mixing and stirring 10-20% by mass of styrene, an emulsifier and water, introducing nitrogen, adding an initiator, dropwise adding the balance of styrene, reacting at constant temperature, filtering, and drying to obtain polystyrene with a microsphere structure for later use;
s2, mixing metal salt, sodium citrate and water glass, and stirring the mixture at normal temperature until the mixture is uniform to obtain metal ion dispersion liquid;
s3, adding the activated carbon into nitric acid with the concentration of 20-25%, heating, adding a metal ion dispersion liquid for soaking treatment, draining, and drying to obtain the activated carbon loaded with metal ions;
s4, taking a mixed solution of water and ethanol with a mass ratio of 4-6:1 as a solvent, dropwise adding a coupling agent, dropwise adding a pH regulator to control the acidity of a solution system, heating in a water bath, adding activated carbon loaded with metal ions, quickly stirring uniformly, adding polystyrene, performing ultrasonic treatment, stirring at a low speed, filtering, drying, and activating at a high temperature under the protection of nitrogen to obtain the desulfurizer.
Further, in the step S1, the temperature of the isothermal reaction is 65-75 ℃; the reaction time is 6-8 h;
in the step S3, the heating temperature is 60-70 ℃, and the soaking time is 10-15 h;
in step S4, the pH value is 4-6, the water bath heating temperature is 60-70 ℃, the rapid stirring speed is 200-; the temperature for high-temperature activation is 650-750 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the tail gas desulfurizer for the rotary kiln has the advantages that polystyrene and metal salt are loaded in the active carbon, so that the adsorption capacity is obviously increased, and the desulfurization effect is good. The organic functional group of the active carbon-polystyrene composite material can effectively adsorb sulfide, and the active carbon with high specific surface area, which is utilized by the metal salt, is taken as a load to fully contact with the sulfide, so that the chemical replacement of the sulfide is realized, and the desulfurization effect is improved.
The preparation method of the tail gas desulfurizer for the rotary kiln can prepare the desulfurizer with high adsorption capacity and good desulfurization effect. Polystyrene with a microsphere structure is formed through polymerization of styrene monomers; the sodium citrate in the metal ion dispersion liquid can complex with metal salt so as to protect the metal ion, and the water glass can improve the dispersibility of the metal salt and provide adhesive force. After the surface treatment is carried out on the activated carbon by the coupling agent, the polystyrene is loaded on the surface of the activated carbon, and metal ions in the activated carbon are activated at high temperature and converted into metal oxides, so that the desulfurization performance is improved, and the aperture of the activated carbon is increased.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
Example 1
A tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
further, the metal salt is a combination of magnesium nitrate, iron nitrate and cobalt nitrate.
Further, the coupling agent is vinyl triethoxysilane.
Further, the emulsifier is composed of stearic acid and polysorbate in a mass ratio of 1: 0.8.
Further, the initiator is potassium persulfate.
Further, the pH regulator is glacial acetic acid.
Further, the polystyrene has a microsphere structure, and the particle size of the polystyrene is 10-100 nm.
The preparation method of the tail gas desulfurizer for the rotary kiln comprises the following steps:
s1, mixing and stirring 10% by mass of styrene, an emulsifier and water, introducing nitrogen, adding an initiator, dropwise adding the balance of styrene, reacting at constant temperature, filtering, and drying to obtain polystyrene with a microsphere structure for later use; wherein the temperature of the constant temperature reaction is 65 ℃; the reaction time is 8 h;
s2, mixing metal salt, sodium citrate and water glass, and stirring the mixture at normal temperature until the mixture is uniform to obtain metal ion dispersion liquid;
s3, adding activated carbon into 20% nitric acid, heating, adding a metal ion dispersion liquid for soaking, draining, and drying to obtain metal ion loaded activated carbon; wherein the heating temperature is 60 ℃, and the soaking time is 10 h;
s4, taking a mixed solution of water and ethanol with a mass ratio of 4:1 as a solvent, dropwise adding a coupling agent, controlling the pH value of a solution system to be 4 by dropwise adding a pH regulator, heating in a water bath at a temperature of 60, adding activated carbon loaded with metal ions, quickly stirring uniformly, adding polystyrene at a stirring speed of 200r/min, carrying out ultrasonic treatment at a frequency of 30kHz, carrying out ultrasonic treatment for 10min, carrying out low-speed stirring at a rotation speed of 50r/min for 50min, filtering, drying, carrying out high-temperature activation under the protection of nitrogen, and carrying out high-temperature activation at a temperature of 650 ℃ to obtain the desulfurizer.
Example 2
A tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
further, the metal salt is a combination of iron nitrate, cobalt nitrate and zinc chloride.
Further, the coupling agent is vinyl trimethoxy silane.
Further, the emulsifier is composed of stearic acid and polysorbate in a mass ratio of 1: 1.2.
Further, the initiator is sodium persulfate.
Further, the pH regulator is glacial acetic acid.
Further, the polystyrene has a microsphere structure, and the particle size of the polystyrene is 10-100 nm.
The preparation method of the tail gas desulfurizer for the rotary kiln comprises the following steps:
s1, mixing and stirring 20% by mass of styrene, an emulsifier and water, introducing nitrogen, adding an initiator, dropwise adding the balance of styrene, reacting at constant temperature, filtering, and drying to obtain polystyrene with a microsphere structure for later use; wherein the temperature of the constant temperature reaction is 75 ℃; the reaction time is 6 h;
s2, mixing metal salt, sodium citrate and water glass, and stirring the mixture at normal temperature until the mixture is uniform to obtain metal ion dispersion liquid;
s3, adding activated carbon into nitric acid with the concentration of 25%, heating, adding a metal ion dispersion liquid for soaking, draining, and drying to obtain activated carbon loaded with metal ions; wherein the heating temperature is 70 ℃, and the soaking time is 10 hours;
s4, taking a mixed solution of water and ethanol with a mass ratio of 6:1 as a solvent, dropwise adding a coupling agent, controlling the pH value of a solution system to be 6 by dropwise adding a pH regulator, heating in a water bath at 70 ℃, adding activated carbon loaded with metal ions, quickly stirring uniformly, adding polystyrene at a stirring speed of 500r/min, carrying out ultrasonic treatment at a frequency of 150kHz for 5min, stirring at a low speed of 100r/min for 30min, filtering, drying, activating at a high temperature under the protection of nitrogen, and obtaining the desulfurizer at the high-temperature activation temperature of 750 ℃.
Example 3
A tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
further, the metal salt is a combination of magnesium nitrate, ferric nitrate, cobalt nitrate, nickel nitrate and zinc chloride.
Further, the coupling agent is vinyltriethoxysilane and vinyltrimethoxysilane.
Further, the emulsifier is composed of stearic acid and polysorbate in a mass ratio of 1:1.
Further, the initiator is potassium persulfate and sodium persulfate.
Further, the pH regulator is glacial acetic acid.
Further, the polystyrene has a microsphere structure, and the particle size of the polystyrene is 10-100 nm.
The preparation method of the tail gas desulfurizer for the rotary kiln comprises the following steps:
s1, mixing and stirring 15% by mass of styrene, an emulsifier and water, introducing nitrogen, adding an initiator, dropwise adding the balance of styrene, reacting at constant temperature, filtering, and drying to obtain polystyrene with a microsphere structure for later use; wherein the temperature of the constant temperature reaction is 70 ℃; the reaction time is 1 h;
s2, mixing metal salt, sodium citrate and water glass, and stirring the mixture at normal temperature until the mixture is uniform to obtain metal ion dispersion liquid;
s3, adding activated carbon into 22% nitric acid, heating, adding a metal ion dispersion liquid for soaking, draining, and drying to obtain metal ion loaded activated carbon; wherein the heating temperature is 65 ℃, and the soaking time is 12 h;
s4, taking a mixed solution of water and ethanol with a mass ratio of 5:1 as a solvent, dropwise adding a coupling agent, controlling the pH value of a solution system to be 5 by dropwise adding a pH regulator, heating in a water bath at 65 ℃, adding activated carbon loaded with metal ions, quickly stirring uniformly, adding polystyrene at a stirring speed of 350r/min, carrying out ultrasonic treatment at a ultrasonic treatment frequency of 100kHz for 7min at a low speed of 70r/min for 40min, filtering, drying, activating at a high temperature under the protection of nitrogen, and obtaining the desulfurizer at the high-temperature activation temperature of 700 ℃.
Example 4
A tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
further, the metal salt is a combination of magnesium nitrate, ferric nitrate, cobalt nitrate, nickel nitrate and zinc chloride.
Further, the coupling agent is vinyltriethoxysilane and vinyltrimethoxysilane.
Further, the emulsifier is composed of stearic acid and polysorbate in a mass ratio of 1:1.
Further, the initiator is potassium persulfate and sodium persulfate.
Further, the pH regulator is glacial acetic acid.
Further, the polystyrene has a microsphere structure, and the particle size of the polystyrene is 10-100 nm.
The preparation method of the tail gas desulfurizer for the rotary kiln comprises the following steps:
s1, mixing and stirring 15% by mass of styrene, an emulsifier and water, introducing nitrogen, adding an initiator, dropwise adding the balance of styrene, reacting at constant temperature, filtering, and drying to obtain polystyrene with a microsphere structure for later use; wherein the temperature of the constant temperature reaction is 70 ℃; the reaction time is 1 h;
s2, mixing metal salt, sodium citrate and water glass, and stirring the mixture at normal temperature until the mixture is uniform to obtain metal ion dispersion liquid;
s3, adding activated carbon into 22% nitric acid, heating, adding a metal ion dispersion liquid for soaking, draining, and drying to obtain metal ion loaded activated carbon; wherein the heating temperature is 65 ℃, and the soaking time is 12 h;
s4, taking a mixed solution of water and ethanol with a mass ratio of 5:1 as a solvent, dropwise adding a coupling agent, dropwise adding a pH regulator to control the pH value of a solution system to be 5, heating in a water bath at 65 ℃, adding activated carbon loaded with metal ions, rapidly stirring uniformly, adding polystyrene at a stirring speed of 350r/min, carrying out ultrasonic treatment at a ultrasonic treatment frequency of 100kHz for 7min at a low stirring speed of 70r/min for 40min, filtering, drying, adding calcium carbonate, mixing and stirring, and carrying out high-temperature activation under the protection of nitrogen at a high-temperature activation temperature of 700 ℃ to obtain the desulfurizer.
Comparative example 1
A tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
90 parts of activated carbon; 10 parts of metal salt;
0.3 part of sodium citrate; 0.5 part of water glass.
Further, the metal salt is a combination of magnesium nitrate, ferric nitrate, cobalt nitrate, nickel nitrate and zinc chloride.
The preparation method of the tail gas desulfurizer for the rotary kiln comprises the following steps:
s1, mixing metal salt, sodium citrate and water glass, and stirring the mixture at normal temperature until the mixture is uniform to obtain metal ion dispersion liquid;
s2, adding activated carbon into 22% nitric acid, heating, adding a metal ion dispersion liquid for soaking, draining, and drying to obtain metal ion loaded activated carbon; wherein the heating temperature is 65 ℃, and the soaking time is 12 h; filtering, drying, and activating at high temperature under the protection of nitrogen, wherein the temperature of high-temperature activation is 700 ℃, so as to obtain the desulfurizer.
Comparative example 2
A tail gas desulfurizer for a rotary kiln comprises the following components in parts by mass:
further, the metal salt is a combination of magnesium nitrate, ferric nitrate, cobalt nitrate, nickel nitrate and zinc chloride.
Further, the coupling agent is vinyltriethoxysilane and vinyltrimethoxysilane.
Further, the emulsifier is composed of stearic acid and polysorbate in a mass ratio of 1:1.
Further, the initiator is potassium persulfate and sodium persulfate.
Further, the pH regulator is glacial acetic acid.
Further, the polystyrene has a microsphere structure, and the particle size of the polystyrene is 10-100 nm.
The preparation method of the tail gas desulfurizer for the rotary kiln comprises the following steps:
s1, mixing and stirring 15% by mass of styrene, an emulsifier and water, introducing nitrogen, adding an initiator, dropwise adding the balance of styrene, reacting at constant temperature, filtering, and drying to obtain polystyrene with a microsphere structure for later use; wherein the temperature of the constant temperature reaction is 70 ℃; the reaction time is 1 h;
s3, adding activated carbon into nitric acid with the concentration of 22%, and heating to obtain activated carbon; wherein the heating temperature is 65 ℃, and the soaking time is 12 h;
s4, taking a mixed solution of water and ethanol with a mass ratio of 5:1 as a solvent, dropwise adding a coupling agent, controlling the pH value of a solution system to be 5 by dropwise adding a pH regulator, heating in a water bath at 65 ℃, adding activated carbon loaded with metal ions, quickly stirring uniformly, adding polystyrene at a stirring speed of 350r/min, carrying out ultrasonic treatment at a ultrasonic treatment frequency of 100kHz for 7min at a low speed of 70r/min for 40min, filtering, and drying to obtain the desulfurizer.
Performance detection
50g of the desulfurizing agents prepared in examples 1 to 4 and comparative examples 1 to 2 were taken to prepare adsorption tubes, air containing 10% of sulfur dioxide was passed through the adsorption tubes, and the adsorbed gas was collected and the sulfur dioxide content was measured by iodometry by using a mixture of ammonium carbamate and sulfuric acid as an absorption liquid to absorb sulfur dioxide in the gas, followed by titration with an iodine standard solution to calculate the sulfur dioxide content and conversion to obtain the adsorption rate of the adsorption tubes, the adsorption rate of each group of desulfurizing agents being shown in Table 1.
TABLE 1 test results
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Example 2 |
| Adsorption rate/%) | 87.8 | 86.3 | 88.5 | 90.1 | 75.7 | 78.9 |
Referring to table 1, it can be seen from examples 1 to 3 that the desulfurizing agent supporting polystyrene and a metal compound has good desulfurization performance, and the adsorption rate reaches over 86%; in example 4, the addition of calcium carbonate can further improve the adsorption rate; in comparative example 1, in which no polystyrene was added, and in comparative example 2, in which no metal compound was added, the adsorption rate was significantly decreased.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
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