CN114345329A - Application of normal-pressure ultra-deep desulfurization catalyst - Google Patents
Application of normal-pressure ultra-deep desulfurization catalyst Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 73
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 73
- 230000023556 desulfurization Effects 0.000 title claims abstract description 73
- IYYZUPMFVPLQIF-UHFFFAOYSA-N dibenzothiophene Chemical compound C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 claims abstract description 31
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- 239000011593 sulfur Substances 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 12
- DGUACJDPTAAFMP-UHFFFAOYSA-N 1,9-dimethyldibenzo[2,1-b:1',2'-d]thiophene Natural products S1C2=CC=CC(C)=C2C2=C1C=CC=C2C DGUACJDPTAAFMP-UHFFFAOYSA-N 0.000 claims abstract description 9
- MYAQZIAVOLKEGW-UHFFFAOYSA-N 4,6-dimethyldibenzothiophene Chemical compound S1C2=C(C)C=CC=C2C2=C1C(C)=CC=C2 MYAQZIAVOLKEGW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011280 coal tar Substances 0.000 claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000006193 liquid solution Substances 0.000 claims description 6
- 150000003464 sulfur compounds Chemical class 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims 2
- -1 sulphur compound Chemical class 0.000 claims 2
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 23
- 238000002360 preparation method Methods 0.000 abstract description 8
- 231100000572 poisoning Toxicity 0.000 abstract description 2
- 230000000607 poisoning effect Effects 0.000 abstract description 2
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- 230000000694 effects Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
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- 230000001590 oxidative effect Effects 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- XIOUDVJTOYVRTB-UHFFFAOYSA-N 1-(1-adamantyl)-3-aminothiourea Chemical compound C1C(C2)CC3CC2CC1(NC(=S)NN)C3 XIOUDVJTOYVRTB-UHFFFAOYSA-N 0.000 description 1
- IWMROTWQUQOFEC-UHFFFAOYSA-N 4-nitro-3,5-bis(trifluoromethyl)-1h-pyrazole Chemical compound [O-][N+](=O)C=1C(C(F)(F)F)=NNC=1C(F)(F)F IWMROTWQUQOFEC-UHFFFAOYSA-N 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses an application of a normal-pressure ultra-deep desulfurization catalyst, and belongs to the technical field of hydrogenation adsorption desulfurization. Compared with the traditional Ni/ZnO hydrogenation adsorption desulfurization catalyst, the catalyst provided by the invention has the advantages of simple preparation, low load capacity, large sulfur capacity and the like, and the adopted reaction process conditions are normal pressure and low hydrogen-oil ratio, so that the catalyst has safety and economic benefits. The catalyst has high deep desulfurization capability on dibenzothiophene and 4, 6-dimethyldibenzothiophene which are difficult to remove, can solve the problems of environmental pollution, catalyst poisoning and inactivation and the like caused by sulfides such as oil products, coal tar, resin, fuel cells and the like at present, and has good industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of hydrogenation adsorption desulfurization, and relates to an application of a normal-pressure ultra-deep desulfurization catalyst.
Background
SO produced by combustion of organic sulfur-containing compounds in gasoline and like oilsXIt can not only cause acid rain, pollute air and harm human health, but also can be used for tail gas of automobileThe three-way catalyst in the purification system causes irreversible poisoning, however, traditional hydrodesulfurization is difficult to reduce the sulfur content of liquid fuels to very low levels in gasoline without losing octane; in coal tar, a large amount of aromatic compounds are contained and are the preferred raw materials for preparing High Energy Density Fuel (HEDF), but the current desulfurization conditions are high temperature, high pressure and high hydrogen consumption, so that the economy and the safety are unreasonable, and benzene rings of the aromatic compounds are hydrogenated, thereby being not beneficial to the production of the HEDF; the resin contains dozens to hundreds of ppm of sulfur, the existing desulfurization catalyst is mainly a Ni/ZnO catalyst, but the reaction time is short, the activity is reduced, the Ni load is high, the sulfur capacity of the catalyst is low, the reaction pressure is high, and the problems of safety and economy exist; hydrogen gas produced from fossil fuel, which is inexpensive and the first choice for fuel cell hydrogen at present, requires desulfurization during hydrogen production, preferably at atmospheric pressure and low H to reduce system complexity and energy requirements of the fuel cell system2The desulfurization reaction is operated under the fuel ratio, and the current catalyst cannot reach the desulfurization condition of normal pressure.
In order to meet the development of times, the development of the normal-pressure low-hydrogen consumption ultra-deep catalyst is imminent, so that the patent discloses the normal-pressure ultra-deep desulfurization catalyst and the application thereof, the catalyst has high deep desulfurization capability on dibenzothiophene and 4, 6-dimethyldibenzothiophene which are difficult to remove, and can meet the desulfurization requirements in the fields of oil products, coal tar, resin, fuel cells and the like. The following desulfurization techniques all have some disadvantages:
chinese patent, publication No.: CN104877077A, a method for preparing hydrogenated C9 resin is introduced, wherein, in the first stage, 20 wt% Ni/ZnO catalyst is adopted as the hydrogenation adsorption desulfurization, the pressure is 18MPa, the requirements on the device are high, and the defects of high Ni load, low sulfur capacity, high hydrogen consumption and the like are overcome. Chinese patent, publication No.: CN 111961001A introduces a desulfurizer for removing dibenzothiophene and 4, 6-dimethyldibenzothiophene in oil products and a preparation method and application thereof, wherein the desulfurizer is prepared by reacting pyrazole organic monomer 3, 5-bis (trifluoromethyl) -4-nitropyrazole with silver oxideThe preparation method is complex in preparation process, environment-friendly, expensive in desulfurizer price, and difficult to realize large-scale desulfurization, and deep desulfurization capability is not shown in desulfurization tests. Chinese patent, publication No.: CN 112892465A, which introduces a catalytic cracking light gasoline adsorbent and a preparation method thereof, adopts Ni-Co bimetal load Sn modified ZnO-TiO2The composite oxide carrier and the catalyst are complex in preparation, desulfurization can not be carried out at normal pressure, and the airspeed is low, so that the treatment capacity is small, and large-scale use is difficult to realize. Chinese patent, publication No.: CN 111821974A introduces an emulsion catalyst and application thereof in oxidative desulfurization of coal tar, wherein the catalyst is a noble metal loaded graphene oxide based Pickering emulsion catalyst, although the oxidative desulfurization method has mild reaction conditions and simple process, the catalyst is complex to prepare and is used in H2O2And the price is high, and the method is not suitable for industrial large-scale production.
Disclosure of Invention
The invention provides an application of a normal-pressure ultra-deep desulfurization catalyst, which can solve the problems of high-pressure high-hydrogen consumption and the like in the fields of oil products, coal tar, resin, fuel cells and the like at present. The invention has wide application field and has very high deep desulfurization capability on dibenzothiophene which is the most difficult to remove, 4, 6-dimethyldibenzothiophene. The catalyst has the advantages of simple preparation, low load capacity, large sulfur capacity and the like, and the adopted process conditions are normal pressure and low hydrogen-oil ratio, thereby having double benefits of safety and economy.
The technical scheme of the invention is as follows:
the application of normal pressure super-deep desulfurization catalyst is characterized by that the liquid solution containing sulfur compound and hydrogen gas are mixed and injected into desulfurization equipment containing normal pressure super-deep desulfurization catalyst, the sulfur in the liquid solution can be removed by means of hydrogenation adsorption desulfurization, its feeding temperature is 240--1The hydrogen-oil ratio is 50-300; the desulfurization rate reaches 100 percent, and the sulfur capacity of the catalyst reaches 1.36 percent; the normal-pressure ultra-deep desulfurization catalyst is a supported Pt/ZnO catalyst, wherein the mass percent of Pt is 0.1-1%, and the mass percent of ZnO is 99-99.9%.
The normal-pressure ultra-deep desulfurization catalyst consists of metal Pt and carrier ZnO, the particle size of the metal Pt is less than or equal to 15nm, the carrier ZnO is of a mesoporous structure, and the specific surface area is more than or equal to 40m3The grain diameter is between 5 and 50nm, and the pore volume is more than or equal to 0.2 ml/g.
The sulfur compound is dibenzothiophene and/or 4, 6-dimethyl dibenzothiophene, and the concentration of the sulfur compound in the liquid solution containing the sulfur compound is 1000ppm-3000 ppm.
The desulfurization device is a fixed bed, a fluidized bed or a desulfurization tower.
The normal-pressure ultra-deep desulfurization catalyst is used for normal-pressure deep desulfurization of oil products, coal tar, resin and fuel cells.
The invention has the beneficial effects that: 1. the invention provides a method for deeply removing sulfur in a 4, 6-dimethyl dibenzothiophene model compound by using a Pt/ZnO catalyst under the reaction condition of normal pressure and low hydrogen flow ratio, wherein the sulfur in the compound does not generate hydrogenation reaction on a benzene ring, and the single path of direct desulfurization cannot be realized in the existing literature.
2. Compared with the existing industrial Ni/ZnO catalyst, the catalyst has the advantages of simple preparation, low load capacity, high sulfur capacity, high desulfurization activity and the like, and the adopted reaction process has mild conditions, and can realize ultra-deep high-efficiency desulfurization under the conditions of normal pressure and low hydrogen consumption.
Drawings
Fig. 1 is an X-ray diffraction image of ZnO support prepared by a solvent-free method.
FIG. 2 shows N of ZnO carrier2Adsorption/desorption isotherms.
FIG. 3 is a transmission micrograph of a Pt/ZnO catalyst after a 400 ℃ reduction treatment.
FIG. 4 is a transmission micrograph of a Pt/ZnO catalyst reacted for 24 hours.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
Example 1: preparing ZnO carrier by solvent-free method. Adding a certain amount of zinc nitrate hexahydrate into a grinding pot according to the formula of n (HCO)3 -):n(Zn2+) Ammonium bicarbonate was added to the mortar at a ratio of 2:1 and the solid reagent was then ground in a mortar, the mixture liquefied and bubbled, producing a faint popping sound, and the reagent was ground until bubbling disappeared, typically for 20 minutes. The milling reaction produces a paste of solid precipitated particles, called ZnO precursor, fig. 1 is a diagram of the steps for preparing the ZnO precursor by solvent-free milling. The ZnO precursor was placed in a vacuum flask and washed 5-10 times with deionized water. And drying the washed ZnO precursor in an oven for 10 hours, and roasting the dried ZnO precursor in a muffle furnace at 500 ℃ for 6 hours to obtain the ZnO carrier. Fig. 2 shows an X-ray diffraction (XRD) pattern of ZnO support prepared by a solvent-free method. FIG. 3 shows N of ZnO carrier2Adsorption/desorption isotherms
Example 2: preparing a certain amount of H with the concentration of 0.01mol/L2PtCl6The solution was added with a certain amount of ZnO carrier at room temperature and stirred for 24 hours. Stirring was stopped, the solid was obtained by rotation on a rotary evaporator, dried in an oven at 80 ℃ for 10 hours at 20% O2Roasting the/Ar mixed gas for 3 hours at 500 ℃, and reducing for 3 hours at 400 ℃ to obtain the Pt/ZnO catalyst. The Ni/ZnO catalyst and the Pd/ZnO catalyst were prepared in accordance with the Pt/ZnO catalyst except that the metal salt precursors were different. FIG. 4 is a transmission micrograph of a Pt/ZnO catalyst.
Example 3: the fixed bed hydrogenation adsorption desulfurization catalyst was prepared from the catalyst 1 wt% Pt/ZnO, 1 wt% Pd/ZnO, and 20 wt% Ni/ZnO prepared in example 2. And (3) investigating the influence of different metal loaded ZnO on the reaction result. The concentration of dibenzothiophene was 3000 ppm. The following table 1 shows the reaction results.
As can be seen from Table 1, the Pt/ZnO catalyst has the highest desulfurization rate, and compared with the existing industrial Ni/ZnO catalyst, the Pt/ZnO catalyst has low loading capacity and good desulfurization effect, and is very suitable for desulfurization under the conditions of normal pressure and low hydrogen consumption.
Example 4: Pt/ZnO catalysts of different loading amounts prepared in example 2 were used as fixed bed hydrogenation adsorption desulfurization catalysts. The effect of metal loading on the reaction results was examined. The concentration of dibenzothiophene was 3000 ppm. The reaction results are shown in Table 2 below.
From Table 2, it can be seen that the 0.5 wt% Pt/ZnO catalyst has the best desulfurization rate.
Example 5: a fixed bed hydrogenation adsorption desulfurization catalyst was used as the 0.5 wt% Pt/ZnO catalyst prepared in example 2. The influence of the space velocity on the reaction results was examined. The concentration of dibenzothiophene was 3000 ppm. The reaction results are shown in Table 3 below.
As can be seen from Table 3, desulfurization of dibenzothiophene was more favored at low space velocities.
Example 6: a fixed bed hydrogenation adsorption desulfurization catalyst was used as the 0.5 wt% Pt/ZnO catalyst prepared in example 2. The influence of the reaction temperature on the reaction results was examined. The concentration of dibenzothiophene was 3000 ppm. The reaction results are shown in Table 4 below.
As can be seen from Table 4, increasing the temperature favors desulfurization of dibenzothiophenes.
Example 7: a fixed bed hydrogenation adsorption desulfurization catalyst was used as the 0.5 wt% Pt/ZnO catalyst prepared in example 2. The influence of the hydrogen-oil ratio on the reaction results was examined. The concentration of dibenzothiophene was 3000 ppm. The reaction results are shown in Table 5 below.
As can be seen from Table 5, a high hydrogen-to-oil ratio is more favorable for dibenzothiophene desulfurization.
Example 8: a fixed bed hydrogenation adsorption desulfurization catalyst was used as the 0.5 wt% Pt/ZnO catalyst prepared in example 2. The influence of the reaction time on the reaction results was examined. The concentration of dibenzothiophene was 3000 ppm. The reaction results are shown in Table 6 below.
As can be seen from Table 6, the Pt/ZnO catalyst can maintain a high desulfurization rate for 36 hours when used for desulfurization of dibenzothiophene, and has a sulfur capacity of 1.36%, which is much higher than that of the conventional industrial Ni/ZnO catalyst.
Example 9: a fixed bed hydrogenation adsorption desulfurization catalyst was used as the 0.5 wt% Pt/ZnO catalyst prepared in example 2. The influence of the reaction temperature on the reaction results was examined. The concentration of 4, 6-dimethyldibenzothiophene was 1000 ppm. The reaction results are shown in Table 7 below.
From Table 7, it can be seen that the Pt/ZnO catalyst has a high desulfurization activity for the most difficult to remove 4, 6-dimethyldibenzothiophene model sulfide.
Claims (8)
1. The application of normal pressure ultra-deep desulfurization catalyst is characterized in that liquid solution containing sulfur compounds and hydrogen are mixed and injected into the catalyst containing normal pressure ultra-deep desulfurization catalystIn the desulfurizing device, sulfur in the liquid solution is removed by hydrogenation adsorption desulfurization, the feeding temperature is 240-340 ℃, the hydrogen partial pressure is normal pressure, and the mass space velocity is 2-39h-1The hydrogen-oil ratio is 50-300; the desulfurization rate reaches 100 percent, and the sulfur capacity of the catalyst reaches 1.36 percent; the normal-pressure ultra-deep desulfurization catalyst is a supported Pt/ZnO catalyst and consists of metal Pt and carrier ZnO, wherein the mass percentage of Pt is 0.1-1%, and the mass percentage of ZnO is 99-99.9%.
2. The application of the catalyst as claimed in claim 1, wherein the normal pressure ultra-deep desulfurization catalyst metal Pt has a particle size of less than or equal to 15nm, the carrier ZnO has a mesoporous structure, and the specific surface area of the carrier ZnO is more than or equal to 40m3The grain diameter is between 5 and 50nm, and the pore volume is more than or equal to 0.2 ml/g.
3. Use according to claim 1 or 2, wherein the sulphur compound is dibenzothiophene and/or 4, 6-dimethyldibenzothiophene and the concentration of sulphur compounds in the liquid solution containing the sulphur compound is between 1000ppm and 3000 ppm.
4. The use according to claim 1 or 2, wherein the desulfurization unit is a fixed bed, a fluidized bed or a desulfurization tower.
5. The use according to claim 3, wherein the desulfurization unit is a fixed bed, a fluidized bed, or a desulfurization tower.
6. The use of claim 1, 2 or 5, wherein the atmospheric pressure ultra-deep desulfurization catalyst is used for atmospheric pressure deep desulfurization of oil products, coal tar, resins and fuel cells.
7. The application of claim 3, wherein the atmospheric pressure ultra-deep desulfurization catalyst is used for atmospheric pressure deep desulfurization of oil products, coal tar, resins and fuel cells.
8. The application of claim 4, wherein the atmospheric pressure ultra-deep desulfurization catalyst is used for atmospheric pressure deep desulfurization of oil products, coal tar, resins and fuel cells.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115584283A (en) * | 2022-10-26 | 2023-01-10 | 大连理工大学 | Method for preparing adamantane high-density fuel from crude fluorene |
| CN117209349A (en) * | 2023-11-07 | 2023-12-12 | 烟台百川汇通科技有限公司 | Process evaluation method for deeply removing thiophenic sulfur in refined benzene at low pressure |
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| CN106701158A (en) * | 2015-11-16 | 2017-05-24 | 神华集团有限责任公司 | Desulfurization treatment method of phenol-containing oil and desulfurated phenolic-containing oil |
| US20200188873A1 (en) * | 2017-02-10 | 2020-06-18 | Advanced Energy Materials, Llc | Nanometal oxide Adsorbents for Desulfurization of Hydrocarbon Fuels |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001278602A (en) * | 2000-03-31 | 2001-10-10 | Idemitsu Kosan Co Ltd | Desulfurization agent, method of desulfurization and method of manufacturing hydrogen for fuel cell |
| CN1724614A (en) * | 2005-06-21 | 2006-01-25 | 大连理工大学 | Deep oxidation desulfurization catalyst |
| CN101007963A (en) * | 2007-01-19 | 2007-08-01 | 华东师范大学 | Method for removing sulfur-containing compound from carbon fuel by catalytic oxidation |
| CN106701158A (en) * | 2015-11-16 | 2017-05-24 | 神华集团有限责任公司 | Desulfurization treatment method of phenol-containing oil and desulfurated phenolic-containing oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115584283A (en) * | 2022-10-26 | 2023-01-10 | 大连理工大学 | Method for preparing adamantane high-density fuel from crude fluorene |
| CN115584283B (en) * | 2022-10-26 | 2024-01-30 | 大连理工大学 | Method for preparing adamantane high-density fuel from crude fluorene |
| CN117209349A (en) * | 2023-11-07 | 2023-12-12 | 烟台百川汇通科技有限公司 | Process evaluation method for deeply removing thiophenic sulfur in refined benzene at low pressure |
| CN117209349B (en) * | 2023-11-07 | 2024-02-06 | 烟台百川汇通科技有限公司 | Process evaluation method for deeply removing thiophenic sulfur in refined benzene at low pressure |
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Application publication date: 20220415 |