Showing papers by "China University of Petroleum published in 2006"
TL;DR: In this article, the influence of drag models on the computational fluid dynamics (CFD) modeling of spouted beds was analyzed. And the results obtained by the different drag models were verified using experimental data of He et al.
245 citations
TL;DR: In this paper, the Cenozoic deformation history of the Qaidam Basin has been studied based on results from the balanced cross-section restoration of six geological sections, and it was shown that the deformation and uplifting in the south and north edges of the Qinghai-Tibet Plateau was almost synchronous with the Altyn Tagh Fault formed at the beginning of India-Asia collision.
194 citations
TL;DR: In this paper, an industrially viable, internally heat integrated (HIDiC) version of a state-of-the-art propylene-propane splitter is presented.
189 citations
TL;DR: The model predicts that the large length of the carbon nanotubes embedded plays a key role in the thermal conductivity enhancement, while the large interface thermal resistance across the nanotube-matrix interface causes a significant degradation.
Abstract: We present a novel model of the effective thermal conductivity for carbon nanotube composites by incorporating the interface thermal resistance with an average polarization theory. The dependence of the effective thermal conductivity on nanotube length, diameter, concentration, and interface thermal resistance has been taken care of simultaneously in our treatment. The model predicts that the large length of the carbon nanotubes embedded plays a key role in the thermal conductivity enhancement, while the large interface thermal resistance across the nanotube-matrix interface causes a significant degradation. Interestingly, the model predicts that the nanotube diameter has a very small effect on the thermal conductivity enhancement of the nanotube composites. In addition, the model predicts that the thermal conductivity enhancement of nanotube composites increases rapidly with decreasing the thermal conductivity of the matrix and increases with increasing the thermal conductivity of the carbon nanotube. Predictions from the novel model are in excellent agreement with the experimentally observed values of the effective thermal conductivity of carbon nanotube nanofluids which the classical models have not been able to explain.
153 citations
TL;DR: In this article, the influence of the frictional stress, maximum packing limit and coefficient of restitution of particles on the spouted bed hydrodynamics has been investigated using two-fluid simulation of spouted beds.
148 citations
TL;DR: In this article, a mesoporous alumina material prepared from precursors of Al[OiPr]3/HNO3 in the presence of glucose in aqueous system, exhibit high specific surface areas, narrow pore size distributions and excellent thermal stability.
136 citations
TL;DR: Gas chromatography with pulsed-flame photometric detector analysis was used to evaluate the effect of R. erythropolis XP treatment on the sulfur content in Fushun crude oil, and it was shown that most organic sulfur compounds were eliminated after biodesulfurization.
Abstract: The soil-isolated strain XP was identified as Rhodococcus erythropolis. R. erythropolis XP could efficiently desulfurize benzonaphthothiophene, a complicated model sulfur compound that exists in crude oil. The desulfurization product of benzonaphthothiophene was identified as α-hydroxy-β-phenyl-naphthalene. Resting cells could desulfurize diesel oil (total organic sulfur, 259 ppm) after hydrodesulfurization. The sulfur content of diesel oil was reduced by 94.5% by using the resting cell biocatalyst for 24 h at 30°C. Biodesulfurization of crude oils was also investigated. After 72 h of treatment at 30°C, 62.3% of the total sulfur content in Fushun crude oil (initial total sulfur content, 3,210 ppm) and 47.2% of that in Sudanese crude oil (initial total sulfur, 1,237 ppm) were removed. Gas chromatography with pulsed-flame photometric detector analysis was used to evaluate the effect of R. erythropolis XP treatment on the sulfur content in Fushun crude oil, and it was shown that most organic sulfur compounds were eliminated after biodesulfurization.
125 citations
TL;DR: A series of noble metal catalysts (Ru, Rh, Ir, Pt, and Pd) supported on alumina-stabilized magnesia (Spinel) were used to produce syngas by methane reforming with carbon dioxide as mentioned in this paper.
116 citations
TL;DR: In this article, a novel aluminosilicate/silico-aluminophosphate composite zeolite ZSM-5/SAPO-11 was synthesized by the in situ overgrowth of SAPO11 on ZSM5 and was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transformed infrared (FT-IR) spectrometry, N 2 adsorption and infrared spectroscopy of adsorbed pyridine.
104 citations
TL;DR: In this paper, a form stable paraffin phase change materials (PCM) was encapsulated in an inorganic silica gel polymer successfully by in situ polymerization, and the differential scanning calorimeter (DSC) was used to measure its thermal properties.
100 citations
TL;DR: In this paper, the influence of Fe loading on the catalytic performances of FeHZSM-5 catalysts for the cracking of isobutane was investigated, and the results indicated that both the isobutan cracking activity and the selectivity to light olefins of Fe-HZ SM-5 samples with a small amount of Fe were greatly enhanced compared with the unpromoted HZSM5, and very high yields of total olefs and propylene were obtained.
TL;DR: It was shown that the hydrate water and CA are the crucial factors in influencing the formation of mesoporous Cr2O3 nanocrystals in the mixture system.
Abstract: Mesoporous chromium oxide (Cr2O3) nanocrystals were first synthesized by the thermal decomposition reaction of Cr(NO3)3.9H2O using citric acid monohydrate (CA) as the mesoporous template agent. The texture and chemistry of chromium oxide nanocrystals were characterized by N2 adsorption-desorption isotherms, FTIR, X-ray diffraction (XRD), UV-vis, and thermoanalytical methods. It was shown that the hydrate water and CA are the crucial factors in influencing the formation of mesoporous Cr2O3 nanocrystals in the mixture system. The decomposition of CA results in the formation of a mesoporous structure with wormlike pores. The hydrate water of the mixture provides surface hydroxyls that act as binders, making the nanocrystals aggregate. The pore structures and phases of chromium oxide are affected by the ratio of precursor-to-CA, thermal temperature, and time.
TL;DR: In this paper, the solubility of CO2 in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (PF6) and the liquid-phase molar volume were determined, in a precision high-pressure PVT apparatus, for water mass fraction of [bmim][PF6] ranging from 0.0067 % to 1.6 % and over temperature and pressure ranges of (40 to 60) °C and (1 to 25) MPa.
Abstract: The solubility of CO2 in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and the liquid-phase molar volume were determined, in a precision high-pressure PVT apparatus, for water mass fraction of [bmim][PF6] ranging from 0.0067 % to 1.6 % and over temperature and pressure ranges of (40 to 60) °C and (1 to 25) MPa. The deviation in solubility, at the same temperature and pressure, with different water mass fractions was not more than 15 %, and the average is 6.7 %. Solubility pressures were correlated with an average relative uncertainty of about 1 % by means of the extended Henry's law for all water mass fractions investigated at less than 6 MPa.
TL;DR: In this article, the solubility parameters of FCC gasoline components and typical polymeric membrane materials were calculated and given out, and polyethylene glycol (PEG) was determined as the promising membrane material for gasoline desulfurization.
TL;DR: The CrHZSM-5 catalysts with a trace amount of Cr were firstly used for catalytic cracking of isobutane, and the effect of Cr-loading on the catalytic performances of the catalysts was also studied.
Abstract: The CrHZSM-5 catalysts with trace amount of Cr were firstly used for catalytic cracking of isobutane, and the effect of Cr-loading on the catalytic performances of CrHZSM-5 catalysts for the cracking of isobutane was also studied. The results suggested that when the loading of Cr in the CrHZSM-5 catalysts was less than 0.038 mmol/g Cr, especially at Cr loading of 0.004 mmol/g, both the reactivity of isobutane cracking and the selectivity to light olefins of CrHZSM-5 samples were greatly enhanced compared with the unpromoted HZSM-5, and very high yields of olefins(C2+C3) and ethylene were obtained. For instance, the yield of olefins(C2+C3) and ethylene reached 56.1% and 30.8%, respectively, at 625 °C when 0.004 mmol/g Cr was loaded on HZSM-5 sample.
TL;DR: In this paper, a crosslinked polyethylene glycol (PEG) membrane was prepared for fluid catalytic cracking (FCC) gasoline desulfurization, and the effect of operation conditions including permeate pressure, feed temperature, feed flow rate and feed sulfur content level on the pervaporation performance was investigated.
TL;DR: In this article, a novel Ag/InVO4-TiO2 composite thin films were synthesized via a sol-gel method in order to elucidate their visible-light-driven photo-catalytic performance.
Abstract: Novel Ag/InVO4–TiO2 composite thin films were synthesized via a sol–gel method in order to elucidate their visible-light-driven photo-catalytic performance. A wide range of techniques, such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photo-electron spectroscopy (XPS), UV–vis absorption spectroscopy (UV–vis) and electron spin resonance (ESR) were applied to characterize the obtained composite thin films. The results revealed that the Ag/InVO4–TiO2 thin films extended the light absorption spectrum toward the visible region. Visible-light-induced photo-catalytic degradation of aqueous methyl orange (MO) and gaseous formaldehyde over Ag and InVO4 co-doped TiO2 thin films was observed. CO2 and SO42− were detected in the products of formaldehyde and methyl orange, respectively, indicating that formaldehyde and methyl orange were mineralized over the Ag/InVO4–TiO2 films under visible light. The effects of doped noble metal Ag by acting as electron traps and InVO4 as a narrow band gap sensitizer in the Ag/InVO4–TiO2 films were also discussed. This study may provide an approach to treatment of organic pollutants by using visible light.
TL;DR: In this article, Nanocrystalline zirconia powder with high surface area, pure tetragonal phase and mesoporous structure was prepared by a surfactant-assisted route by using Pluronic P123 block copolymer as the surfactants.
TL;DR: In this paper, an improved Pal and Rhodes model including the effective water cut theory and the relationship between non-Newtonian behavior and water cut is developed, which can predict relative viscosity of water-in-crude oil emulsions over the range of the maximum and minimum water cut.
TL;DR: In this paper, a newly formulated KCl/sodium silicate system, which overcome the fatal drawbacks of the silicate-based mud systems used previously and characterized by the perfect rheological properties and filtration control, was developed and applied to provide the necessary inhibitive character.
TL;DR: D2d and D3d have definite corrosion expressions, which respectively denote the fractal dimensions for pit diameter distribution and pit depth distribution on real corroded surface.
TL;DR: In this paper, the fluidization behaviors of ultarfine particles were investigated in an acoustic fluidized bed with one type of micron particles and two types of nanoparticles, and it has been found that increasing sound frequency leads to a reduction in minimum fluidization velocity, and then to an increase in minimum liquidization velocity.
TL;DR: In this paper, an ammonia solution of ethylene glycol was used as the acid removal reagent by mixing with the petroleum fraction and then allowing the two phases to separate, with the naphthenic acids being extracted from petroleum fractions.
TL;DR: In this paper, the thermal gradient evolution histories of 70 wells during the Cenozoic time in the Jiyang depression were modeled by using the vitrinite reflectance and apatite fission track data.
Abstract: The thermal history of the sedimentary basins is an important parameter for the study of tectonic evolution, hydrocarbon accumulation and resource assessment. The thermal gradient evolution histories of 70 wells during the Cenozoic time in the Jiyang Depression were modeled by using the vitrinite reflectance and apatite fission track data in this paper. Based on these modeling results, the characteristics of thermal evolution of the Dongying, Zhanhua, Huimin and Chezhen sags in the Jiyang depression were analyzed. The thermal gradients of the depression decreased during the Cenozoic time. However, it decreased quickly in the Eogene, but only changed a little during the Neogene time. The thermal gradient was 54.0~50.0°C/km during the deposition of the Kongdian Group, 50.0~40.0°C/km during the period of Shahejie group, 40.0~38.5°C/km of Dongying group and 38.5~35.5°C/km during the Neogene. It changed little after that time and decreased down to 35°C/km at the present-day. The four sags had different thermal evolution history, especially after the Dongying tectonic movement at the end of Eogene. The thermal gradient of the Dongying sag is the highest, then the Zhanhua sag is next, the Huimin sag is relative lower and the Chezhen sag lowest. The Chezhen sag underwent the lowest thermal history during the whole period of Cenozoic time. The differential thermal gradients resulted in the different threshold depth of hydrocarbon generation in the four sags. The modeling results of thermal history fits well with the evolution stages of rift-subsidence basin to down-warped basin by the tectonic subsidence analyses of the Jiyang depression.
TL;DR: In this article, the authors presented the preparation of monodisperse silica particles by Stober method, and then grafted by γ-methacrylic propyl trimethoxysilane (MPS) as a coupling agent, using these modified particles, the more stable silica-PS superfine composite particles with higher monodispersity than these of previous reports are prepared and reported through dispersion polymerization (DP) method, whose morphology is investigated with transmission electron microscope (TEM).
TL;DR: In this article, the characteristics of CO 2 corrosion of N80 and 4Cr steels with corrosion scales were studied using electrochemical impedance spectroscopy (EIS) and Warburg impedance coefficient.
TL;DR: In this article, the kinetic data of methane hydrate dissociation at various temperatures and pressures were measured in a sapphire cell apparatus by depressurizing method, and the experimental results showed that the rate was controlled by intrinsic dissociation reaction.
TL;DR: In this article, the static pressure, velocity and density contours across the slotted orifice and the standard orifice flow meter have been analyzed with the help of Computational Fluid Dynamics (CFD) technology.
TL;DR: In this paper, a kind of novel nanofiltration membrane was prepared from polyimide based on 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) for recovering chilled solvents from lube oil filtrates.
TL;DR: In this paper, the authors measured the density, kinematic viscosity, and viscosities of the multicomponent nonelectrolyte solutions obeying the linear isopiestic relation.
Abstract: The densities and viscosities were measured at 298.15 K for the quaternary system mannitol + sorbitol + sucrose + H2O and its binary and ternary subsystems (mannitol + H2O, sucrose + H2O, and sorbitol + H2O) and (mannitol + sorbitol + H2O, mannitol + sucrose + H2O, and sorbitol + sucrose + H2O). The results were used to test the applicability of simple equations for the density, kinematic viscosity, and viscosity of the multicomponent nonelectrolyte solutions. The predicted results are in good agreement with the measured values, indicating that the density, kinematic viscosity, and viscosity of the multicomponent nonelectrolyte solutions obeying the linear isopiestic relation can be related to those of their constituent binary solutions by the simple equations.