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The general desulfurization process referred to as “indirect sulfation” takes place via a two-step process. Calcination makes limestone decompose to calcium oxide (CaO), and then SO2 molecules are adsorbed onto the calcined limestone. However, if the CO2 partial pressure in the system is higher than the equilibrium CO2 pressure over the limestone, an adsorption reaction between limestone and SO2 molecules...
A comparative study was experimentally performed on the explosion characteristics of four pentanol isomer–air mixtures (n-pentanol, 3-methyl-1-butanol, 2-methyl-1-butanol, 2-methyl-2-butanol), at various initial temperatures and initial pressures. The explosion parameters of explosion pressure, maximum rate of pressure rise, combustion duration and combustion development period were measured. The...
Unconventional shale gas reservoirs have become the focus of considerable attention as primary energy resource over the past decades worldwide. Economic gas rate requires the creation of complex fracture networks which could be characterized by the stimulated reservoir volume (SRV) concept. Micro-seismic mapping technique could provide a measurement of the overall SRV and an estimate of the fracture...
Alternative jet fuels and blends are required to meet a minimum aromatic concentration of 8%. It has been proposed that some monoaromatic compounds may make suitable single component aromatics to meet this minimum. One monoaromatic of interest is p-cymene which can be efficiently produced from eucalyptus oil. The oxidative stability of p-cymene and a range of monoaromatics blended with a range of...
Porosity and pore size distribution (PSD) are crucial for reserve and producibility estimation and production planning. PSD properties are evaluated in the subsurface from nuclear magnetic resonance (NMR) logs and require knowledge about surface relaxivity. In common industry practice, a constant surface relaxivity value is used for a well, formation or rock type, regardless of mineralogical and textural...
Alcoholysis reaction for non-edible karanja vegetable oil is investigated in the presence of potassium hydroxide catalyst. The mass transfer and chemical kinetics studies were conducted in a batch reactor together with the effect of temperature on overall reaction kinetics at optimized molar ratio of oil to methanol (1:6) and 1% catalyst weight at a mixing speed of 600rpm. The overall karanja alcoholysis...
Gas diffusion in coal is controlled by nano-structure of the pores. The interconnectivity of pores not only determines the dynamics of gas transport in the coal matrix but also influences the mechanical strength. In this study, small angle neutron scattering (SANS) was employed to quantify pore accessibility for two coal samples, one of sub-bituminous rank and the other of anthracite rank. A theoretical...
Vegetable oils are excellent feedstock for production of diesel and jet fuels. However, catalysts and processes published in the literature do not produce drop-in fuels. One of the major problems is the selectivity and stability of the catalysts. It is vital that the hydrotreating is tested after at least 200h on stream to measure the steady-state performance of the catalyst rather than its initial...
Control system design is one of the key elements which need to be studied before commercial implementation of oxy-fuel power plants. Among others, the control strategy for flue gas recycle process should be firstly considered as it is one of the major differences between oxy-fuel combustion and traditional power plants. In this paper, a dynamic model combined with exergy analysis was firstly proposed...
Several power plant configurations have been recently studied as an alternative to conventional technologies in the field of energetic conversion of coal. The price of natural gas shows a volatile trend and when at its maximum promotes a renewed interest in technologies converting coal into synthetic natural gas (SNG). Moreover, in an low-carbon economy these processes include the capture of CO2 in...
The knowledge of the dielectric property is essential to design and develop microwave technology for processing biomass materials. This paper focuses on the measurement of dielectric properties of three different Saudi Arabian date palm biomass (seed, leaf and stem) from room temperature to ∼800°C and at six different frequencies (397–2986MHz) using a cavity perturbation method. The result showed...
This work is focused on the thermodynamic modeling of systems related to biodiesel processing using the Perturbed Chain form of the Statistical Associating Fluid Theory (PC-SAFT). Different binary ester+ester and methanol or ethanol+ester systems were investigated. The PC-SAFT equation of state was able to predict the vapor–liquid equilibrium and solid–liquid equilibrium of different esters+esters...
The nickel and vanadium content of heavy oil and bitumen affects residue upgrading technology selection. Processes employing heterogeneous catalysts cannot be selected when the metals concentration in the oil exceeds tens, or at most a few hundred parts per million, due to catalyst fouling. Demetalation of high metal content oil is desirable before catalytic conversion. Mild halogenation was evaluated...
Even though diesel particulate filters (DPFs) have been in commercial production for many years, there is still much optimisation activity, especially in the field of the regeneration strategy of these filters.A method for obtaining organosoluble substances with an iron content of 10–15wt% and composition containing iron additives and other selected substances has been developed. These organosoluble...
The physicochemical and optical properties of combustion-generated particles from various sources were investigated. Coal-fired power plants, charcoal kilns, automobiles, and ship engines were the major sources, representing combustions of coal, biomass, and two different types of diesel, respectively. Scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and...
Energy crops and biogeneous residues offer the highest potential for future growth in biomass utilization. Traditional forest grown wood types, along with their consistent combustion characteristics, will thus be replaced by fuels with highly heterogeneous composition. Reliable prediction of their combustion characteristics and in particular of their ash behavior is essential for plant designers and...
Synthesis of biodiesel was carried out through enzymatic biocatalysis by the transesterification of natural waste olive oil (alperujo oil) using a recombinant 1,3-positional selective Rhizopus oryzae lipase (rROL). The most relevant property of this uncommon substrate is the high content of free fatty acids (FFAs), making it impossible to produce biodiesel through basic catalysis. The synthesis reactions...
The cracking performance determined by corresponding physiochemical properties of a FCC catalyst is usually one of the most important factors for catalyst selection and design. Thus, it is crucial to study the quantitative correlations of cracking performance with catalyst physiochemical properties. In this study, six commercial FCC catalysts were evaluated by cracking experiments on a fixed fluidized...
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