in the present study, a heterogeneous and homogeneous gas flow dispersion model for simulation and optimization of a large-scale catalytic slurry reactor for the direct synthesis of dimethyl ether (dme) from synthesis gas (syngas) and co2, using a churn-turbulent regime was developed. in the heterogeneous flow model, the gas phase was distributed into two bubble phases including small and large...

Loss of containment in the oil and gas and chemical process industries can have undesirable safety and environmental consequences. If leaks are not discovered at an early stage, they can accumulate into dangerous gas clouds that can ignite and create explosions or inflict harm as toxic agents. A recent report by British Petroleum estimates a single cavity pressure vent at an unmanned offshore p...

Petroleum hydrocarbon contamination of ground water is a significant and often complex problem. The complexity results from the fact that ground-water contamination is a product of soil contamination. Especially with older spills, significant amounts of hydrocarbons can be trapped below the water table. Traditional pump and treat is ineffective because of the low solubility of trapped oily phas...

at the present study, different properties of sarin with the formula [(ch3)2cho]ch3pof was studiedin gas phase. geometrical optimizations of sarin, single point calculation, nmr and electricalparameters were carried out in gas phase with the hartee -fock method coupled to 6-31g* basis setsfor all atoms. the results obtained from a comparison between tables and charts came up fordiscussion and a...

The fractional electron power quickly transferred to heat in non-equilibrium plasmas was studied experimentally and theoretically in N(2)/O(2) mixtures subjected to high electric fields. Measurements were performed in and after a nanosecond surface dielectric barrier discharge at various (300-750 Torr) gas pressures and (50-100%) N(2) percentages. Observations showed that the efficiency of fast...

Soil gas measurements of radon (222Rn), CO2, and hydrocarbon concentrations, as well gamma-ray spectrometry, were conducted at two separate locations to estimate the measurement results for known accumulations in subsurface oil seepage on surface. The aim study was confirm applicability method identifying migration pathways (e.g., faults) detect possible seepages hydrocarbons surface investigat...