Maryam Baninaam, Seyed Ali Hosseini, Ahmad Reza Abbasian
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引用次数: 9
摘要
本文报道了伊朗重质原油中沥青质在几种天然和合成硅铝酸盐上的吸附研究。用正庚烷沉淀沥青质。以甲苯为沥青质的沉淀溶剂，以4A、ZSM-5、斜沸石、la改性膨润土(Phoslock)等沸石为吸附剂。红外光谱分析表明沥青质由芳香族、脂肪族和极性化合物组成。用BET法测定了吸附剂的孔径和外表面积，外表面积大小顺序为:ZSM-5 (238.27 m2?g?1)?>斜发沸石(28.75平方米? g ? 1) ?在?Phoslocks(27.92平方米? g ? 1) ?在?沸石4A (21.11 m2?g?1)沸石13X (317.24 m2?g?1)。此外，用常规等温线模型研究了吸附等温线，结果表明Langmuir等温线与实验数据吻合较好。沸石13X具有最高的比表面积和孔径，表现出最大的吸附容量，说明比表面积与吸附容量之间存在直接关系。然而，由于沥青质分子的大尺寸，孔径效应似乎更为突出。
Isothermal study of asphaltene adsorption over 4A, 13X, ZSM-5, clinoptilolite zeolites, and phoslock
The paper reports the adsorption studies of asphaltenes of Iran’s heavy crude oil on some natural and synthetic alumino-silicates. Asphaltenes were precipitated using n-heptane. Toluene was used as a precipitating solvent of asphaltenes and several zeolites including 4A, ZSM-5, Clinoptilolite, and La-modified bentonite (Phoslock) as adsorbents. FTIR analysis indicated the asphaltenes which comprise a complex of aromatic, aliphatic, and polar compounds. The pore size and outer surface area of the adsorbents were determined by BET method and the following order was found between outer surface areas: ZSM-5 (238.27?m2?g?1)?>?Clinoptilolite (28.75?m2?g?1)?>?Phoslocks (27.92?m2?g?1)?>?zeolite 4A (21.11?m2?g?1)?>?Zeolite 13X (317.24?m2?g?1). Besides, the adsorption isotherms were investigated with the conventional isotherm models and it was indicated that the Langmuir isotherm fitted the experimental data. Zeolite 13X with the highest specific surface area and pore size exhibited the maximum adsorption capacity, indicating that there is a direct relationship between surface area and adsorption capacity. However, it seems that the pore size effect is more prominent because of the large size of asphaltene’s molecules.
期刊介绍：
Applied Petrochemical Research is a quarterly Open Access journal supported by King Abdulaziz City for Science and Technology and all the manuscripts are single-blind peer-reviewed for scientific quality and acceptance. The article-processing charge (APC) for all authors is covered by KACST. Publication of original applied research on all aspects of the petrochemical industry focusing on new and smart technologies that allow the production of value-added end products in a cost-effective way. Topics of interest include: • Review of Petrochemical Processes • Reaction Engineering • Design • Catalysis • Pilot Plant and Production Studies • Synthesis As Applied to any of the following aspects of Petrochemical Research: -Feedstock Petrochemicals: Ethylene Production, Propylene Production, Butylene Production, Aromatics Production (Benzene, Toluene, Xylene etc...), Oxygenate Production (Methanol, Ethanol, Propanol etc…), Paraffins and Waxes. -Petrochemical Refining Processes: Cracking (Steam Cracking, Hydrocracking, Fluid Catalytic Cracking), Reforming and Aromatisation, Isomerisation Processes, Dimerization and Polymerization, Aromatic Alkylation, Oxidation Processes, Hydrogenation and Dehydrogenation. -Products: Polymers and Plastics, Lubricants, Speciality and Fine Chemicals (Adhesives, Fragrances, Flavours etc...), Fibres, Pharmaceuticals.
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