Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"naphtha"”.
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Characterization of Pt/Al2O3 and Pt-Re/Al2O3 reforming catalysts and their evaluation using a naphtha feedstock, The
Includes bibliographical references.
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Dimerization of naphtha-range Fischer-Tropsch olefins into diesel-range products over zeolite H-ZSM-5 and amorphous silica-alumina
… 1-octene (as model compounds for Fischer-Tropsch naphtha-range olefins) into diesel-range olefins was carried out in a tubular, continuous flow fixed-bed reactor, in the liquid phase, over zeolite H-ZSM-5 and an amorphous silica-alumina (ASA) catalyst. Both catalysts were in the form of extrudates.
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The design and construction of a liquid-liquid solvent extractor with reflux
… with the system methylcyclohexane-petroleum naphtha-aniline at 25°C. ± 1°C. Saturation of equilibrium data with the corresponding refractive indices were determined. Rates of flow and reflux ratios were calculated by the material balance of Varteressian and Fenake which is based on the …
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Effects of Variables on a Soaker-Stripper Reactor for Thermal Cracking of Deasphalted Oil
… (R), vacuum gas oil (VGO), distillates (D), naphtha (N) and gases (G). Thermal cracking of the residue followed first order kinetics with activation energies ranging from 172 to 250 kJ/kmol. Gases were found to be produced almost exclusively from residue, and naphtha was found to be a …
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Non-thermal Plasma Assisted Catalytic Upgrading of Low-cost Hydrocarbons
… reactions, such as catalytic reforming of naphtha and hydrodesulfurization of crude oil. Upon plasma activation, the co-fed methane can effectively accelerate hydrogenation and isomerization reactions for iso-paraffin production over an optimized Ga-based ZSM-5 catalyst. A systematic model …
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Degradation analyses of empirical inferential predictors for the development of improved dynamic mechanistic/empirical equations
… flow into LPG and a heavier stream of catalytic naphtha. The operation of the Debutaniser is crucial for maintaining the total C5 vol% and RVP within specified limits, ensuring optimal operation of downstream units. Given the high costs associated with real-time analysers, the study explores the …
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Kinetic Modelling Simulation and Optimal Operation of Trickle Bed Reactor for Hydrotreating of Crude Oil. Kinetic Parameters Estimation of Hydrotreating Reactions in Trickle Bed Reactor (TBR) via Pilot Plant Experiments; Optimal Design and Operation of an Industrial TBR with Heat Integration and Economic Evaluation.
… (using distillation pilot plant unit): light naphtha (L.N), heavy naphtha (H.N), heavy kerosene (H.K), light gas oil (L.G.O) and reduced crude residue (R.C.R) in order to compare the yield of these fractions produced by distillation after the HDT process with those produced by conventional …
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Investigation of Recyclable and Renewable Crude oil from Biomass and Plastics
… of LDPE pyrolysis oil results in 9.8 wt.% more naphtha yield and 1 wt.% coke yield than the VGO catalytic cracking.</p>
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Mass transfer studies in heavy oil recovery using solvents
… being highly viscous needs a diluent like naphtha for transportation. Therefore another method is devised which involves using gaseous or liquid solvents directly to bring down the viscosity of bitumen. One such method, vapor extraction (VAPEX) process uses gaseous solvents like hydrocarbon …
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Sustainable firm performance of green supply chain management practice at petrochemical industry
… the industrial sector as well as availability of naphtha raw material. Therefore, to achieve the industry sustainability it is a need to have Green Supply Chain Management (GSCM) model toward petrochemical industry sustainability in line with the Green Industry Long Run Strategic Plan in …
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Understanding the active sites of Mg-Al oxide catalysts in the formation of aromatic platform chemicals from acetaldehyde
… chemicals traditionally produced from petroleum naphtha. The acid-base properties of the catalyst must be carefully designed in order to selectively promote the multiple condensation-cyclodehydration mechanisms, yet it is not clear what the active sites actually are. To investigate this, we built …
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Advancing plastics reutilization via catalytic hydroconversion
… We demonstrate Ni/BEA is optimal for naphtha generation, with productivities that surpass Pt- and other earth-abundant metal-based catalysts. We deduce Ni/BEA operates in a nonideal (metal-deficient) hydrocracking regime and reveal that LDPE chains can directly diffuse into the zeolite …
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Geochemical Reaction Proxies (Parameters) to Remotely Monitor In Situ Chemical Reactions and Assess the Extent of Bitumen Upgrading during Thermal Recovery Processes
… steroid hydrocarbons decreasing, whereas naphtha, atmospheric distillate, lower end VGO fractions and lighter hydrocarbons such as n-C9 to n-C17 alkanes, isoprenoid alkanes, naphthalenes, phenanthrenes, anthracenes, dibenzothiophenes increasing. Established reaction proxies, which are a …
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Sustainability within the polyester value chain
… acid is p-xylene, conventionally made from naphtha. It is feasible, however, to manufacture p-xylene by the catalytic conversion of sugars extracted from biomass sources. A PET bottle made using p-xylene derived from willow could reduce the GWP and non-renewable energy use by 32% and 2%, …
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Optimization of Great Plains Coal Gasification Using Aspen/SP
… predicted flow of condensible volatile matter (naphtha, phenol, tar oil) was corrected to allow for the significant amount of non-condensible volatile matter produced during devolatilization. (Previously, all volatile matter was assumed to be condensible.) • The heat transfer coefficient of the …
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Optimal design and operation of energy polygeneration systems
… coal and biomass to electricity, liquid fuels (naphtha and diesel) and chemical products (methanol) with carbon dioxide (CO²) capture under different economic scenarios is investigated. In this system, syngas is produced by gasification of coal and/or biomass; purified by a cleaning process to …
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Waste to fuel: designing a cobalt based catalyst and process for once-through Fischer-Tropsch synthesis operated at high conversion
… at lower conversions (XCO = 60%) and largely naphtha/distillate products at higher conversions (XCO > 80%). The Fischer-Tropsch products were partially refined to distillate (low density diesel) by means of flash tanks and an atmospheric distillation column. At lower conversion levels, a …
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Association Between Smoking, Chemical Exposure and Hearing Loss in an Occupational Setting
Objective: Twenty-two million Americans or roughly 8% of the population are hearing impaired. This affects more than just the ability for one to hear. In the last three decades, younger Americans have shown a sharp increase in hearing impairment. Hearing loss affects social and emotional well being …