No abstract

In this paper, the thermal decomposition of hydrogen sulphide by Cadmium Chalcogens (CdS, CdSe, and CdTe) to hydrogen and sulphur was studied in the temperature range 275-525 • C. The thermal dissociation of hydrogen sulphide process efficiency by these semiconductors, under similar conditions, depended on the type of semiconductor and followed the following trend: CdSe ≥ CdTe > CdS. The experiment also showed that H 2 S is stable at temperatures below 275 • C in the presence of these semiconductors. It is found that the molar percentage of H 2 produced is increased with reaction time increased up to 120 min, and reaches a plateau value for longer reaction times.

Many physical properties of aqueous N-Methyl pyrrolidone mixtures were determined for molar fraction X NMP ¼ 0.02, 0.05, 0.125, 0.32, 0.37 at different temperatures ranging from 15-65 C. From the result we noticed that the viscosity coefficient was increased with increasing the molar fraction X NMP and reached a maximum value at X NMP ¼ 0.25-0.37, and decreased with temperature. We observed the same relationship of the thermodynamic properties for the mixture at different temperatures and for excess activation function was positive. They reached maximum value at the X NMP ¼ 0.25-0.37. The same relationship was observed for excess dielectric constant. The results were explained according to hydrogen bonding effects and dipole-dipole interactions. This binding is stronger than binding between water molecules which may be let to form a complex at the ORDER REPRINTS molal fraction ratio 2:1 of water-NMP solution. We noticed that an increase in temperature may be let to tighten the interaction between water and NMP.

No abstract

A compote procedure is presented in this article for estimating static pressure gradient. The procedure integrates reservoir properties; temperature, pressure, depth, and density to calculate pressure drop in wellbore. The procedure constraints are intended to ensure that an accurate pressure gradient is obtained.