FUEL PROCESSING TECHNOLOGY
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2023
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IF 7.5
Luoming Kang,Airong Li,Yuan Lu,Yuling Ma,Cheng Wang
Mercaptans as volatile organic sulfur compounds would cause environmental pollution. Researches are focused on the removal of mercaptans by solvent absorption method. In this work, a new efficient absorbent of 1-butyl-3-methylimidazolyl alanine ([Bmim]Ala) was prepared and evaluated by the removal of mercaptans from the model gas containing methyl mercaptan (MeSH, 307.6 mg/m 3 ), ethyl mercaptan (EtSH, 201.1 mg/m 3 ) and propyl mercaptan (PrSH, 149.9 mg/m 3 ) in nitrogen. The results showed that the removal rate of MeSH, EtSH and PrSH was 97.77, 98.12 and 100.00%, respectively, at a temperature of 35 °C and a pressure of 1.00 bar for 2 min. After 6 recycling times, [Bmim]Ala remained a good performance for the removal of mercaptans. The desulfurization mechanism was proposed that the absorption sites were mainly on the alanine anion (Ala − ) and Ala − could be replaced by the thiol anion (RS − ) to form a new ionic liquid 1-butyl-3-methylimidazolyl thiolate ([Bmim] + RS − ). Meanwhile, since the electrostatic interaction between -COO − in Ala − and H -g on the imidazolium cation could be destroyed by the -SH group, the -COO − group would interact with mercaptans to form a strong H-bond. The amino in Ala − and the -SH group could form Lewis acid-base compounds.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
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IF 6.609
Lan li,Feng Ju,Yao Sun,Hui Pan,Hao Ling
The Ni/ZnO-Al 2 O 3 -SiO 2 adsorbent is a widely used industrial adsorbent for reactive adsorption desulfurization (RADS) process. Metallic Ni and NiO are assumed as the main RADS active sites, and NiS x is the intermediate phase to transfer sulfur to ZnO. However, NiS x could also be the active center for RADS process. In this work, to conduct the desulfurization activity of NiS x , a novel NiSO 4 /ZnO-Al 2 O 3 -SiO 2 adsorbent was prepared and examined through a serious experimental and theoretical study over the conventional adsorbents. Results showed that NiSO 4 based adsorbents could first self-sulfide to NiS x phases, and then NiS x plays as main active sites for RADS. The NiSO 4 phases improved the direct desulfurization selectivity of dibenzothiophene (DBT). By adjusting the content of nickel, the sulfur removal rate of adsorbent with 3 wt% Ni from NiSO 4 could achieve the same level of adsorbent prepared with 18 wt% Ni from NiO. Moreover, NiSO 4 based adsorbent performs excellent desulfurization activity, and its breakthrough sulfur capacity achieves 122.0 mgS/g. The evolution of Ni species on NiSO 4 adsorbent has been studied, and a desulfurization mechanism that takes both NiO and NiS x as active phases has been carried out. NiO phase mainly promotes the hydrodesulfurization pathway, while NiS x phase prefers the direct desulfurization pathway. Finally, the mechanism of RADS on NiS x and the reaction pathways of DBT are also presented.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2013
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IF 3.41
Jiajun Gao,Wenyan Ma,Linpo Yuan,Yafen Dai,Chunxi Li
Lewis–Brønsted complex acid, such as BF 3 , SnCl 4 , FeCl 3 , or ZnCl 2 -CH 3 COOH, can enhance thiophenic compound oxidation using solid oxidants. The catalytic oxidative mechanism was studied here. For the catalysis of the complex acid system, Lewis acid was the core, improving the Brønsted acidity of the system, promoting the dissolution of oxidant in the system, and finally catalyzing the oxidation of sulfur in the oil. For the oxidation of thiophenic compound, dibenzothiophene (DBT) was oxidized to its sulfone, but benzothiophene (BT) and thiophene (T) were oxidized to some unidentified products besides the sulfones or sulfoxides. These unidentified products originated from the oxidation of unsaturated bonds on thiophenic compounds. The electronic property of unsaturated bonds, which included bond order and π orbital occupancy, was used to explain the reactivity of unsaturated bonds on those compounds. On the basis of mechanism obtained, the catalysis for the oxidation of sulfur against olefins was controlled.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2025
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IF 1.9
Yi Bai,Tailiang Zhang,Qingzheng Yang,Xin Cheng
At present, the use of oil-based drilling fluids is an effective means of achieving efficient drilling. Because of the complex geological conditions, the sulfur content of oil-based drilling fluids increases with increasing drilling time, which has become a difficult problem restricting the exploitation of oil and gas resources. The oil-soluble triazine sulfur remover XN was synthesized from octylamine and formaldehyde, and its structure was characterized by infrared spectroscopy (FTIR) and nuclear magnetic hydrogen spectroscopy (1HNMR). The synthesis conditions of the sulfur removal agent XN were further studied. Simultaneously, the sulfur removal, corrosion, and compatibility of the sulfur removal agent XN in oil-based drilling fluid were studied. The results show that under the conditions of 1% desulfurizer dosage system, 70 °C desulfurization temperature, 30 min desulfurization time, and 100r/min stirring intensity, the optimal desulfurization efficiency of the desulfurizer is 93.09%, and it has good compatibility with oil-based drilling fluid and certain corrosion inhibition performance. When the amount of desulfurizer is 0.2%, the optimal desulfurization efficiency is 93.09%. The maximum corrosion rate is only 0.09 mm·a−1. The desulfurization mechanism of XN was studied using infrared and hydrogen nuclear magnetic resonance spectroscopies. Because XN exhibits good sulfur removal performance in oil-based systems, it is expected to be used as a sulfur removal agent in oil-based drilling fluids with high sulfur content in oil and gas fields.
研究领域:
石油工程
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钻井液技术
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化学合成
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脱硫机制
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腐蚀抑制
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油气勘探
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）