Diffusion coefficients were obtained from rates of gas absorption in polyethylene rods under isothermal-isobaric conditions by means of a new diffusivity apparatus.

В«В lessДiffusion and solubility coefficients have been determined for the CO/sub 2/-, CH/sub 4/-, C/sub 2/H/sub 4/-, and C/sub 3/H/sub 8/-polyethylene systems at temperatures of 5, 20, and 35/sup 0/C and at gas pressures up to 40 atm. Preliminary design calculations for sweetening natural gases by absorption suggested the superiority of mixed solvent absorption over conventional aqueous alkanolamine solutions in some circumstances. Henry's constants for ethane, hydrogen sulfide, moreВ В» and carbon dioxide in polar and nonpolar solvents were correlated by a modification of the regular-solution model that included corrections for dipole-induced dipole contributions and hydrogen-bond effects. Thermodynamically consistent equations were developed for representing gas-absorption equilibria with chemical reaction.

The solubilities of ethane, carbon dioxide, and hydrogen sulfide were determined in propylene carbonate, N-methyl-2-pyrrolidone, and tetramethylene sulfone (sulfolane) and in nonaqueous mixtures of these physical solvents with monoethanolamine and diglycolamine. Equilibrium solubilities accurate to within 1Vertical Bar3< were determined from total gas pressure and material balances. Solvent selectivity for the purification of nature gases was studied by using an apparatus for measuring the solubility of gases in pure or mixed solvents below 1 atm and at -20/sup 0/ to +200/sup 0/C. the acid gas selectivity can be optimized with the inclusion a limited quantity of a hydrophilic component to enhance H 2S and CO 2 while still minimizing the hydrocarbons = , The HPS exhibits rather high CH 4 and C 2H 6 absorption, and consequently, has low acid gas selectivity compared to the commercially available physical solvent.

Here, the simulation results suggest that HPS can remove acid contaminants and achieve the targeted quality of natural gas for liquid natural gas (LNG) production. The temperature-dependent HenryвЂ™s constant correlations of these gases were developed and used to determine the separation performance of the HPS in a simple absorber process simulation. The HenryвЂ™s constant of N 2O in the HPS was also determined and used to differentiate the physical absorption of the acid gases from the chemical absorption. The gas solubilities were evaluated at atmospheric pressure in the temperature range of 298-353 K. Column Analysis allows you to see how modifications in packing and trays change the hydraulic behavior and the operating range of the column.The HenryвЂ™s constants of H 2S, CO 2, CH 4, and C 2H 6 in a hydrophobic solvent (HPS) were determined to evaluate the potential use of the HPS for natural gas sweetening applications. Currently, the Glycol Property Package can be used to model dehydration using TEG in Aspen HYSYS. In the absorption process, the glycols, ethylene glycol (MEG), diethylene glycol (DEG), and triethylene glycol (TEG) are the commonly used absorbents. With accurate modeling and predictive results, engineers can save CAPEX, OPEX and time by making decision quickly and confidently. Luckily, your favorite process simulator, Aspen HYSYS В®, includes best-in-class technology for simulating gas treating units- including dehydration, acid gas treating, and sulfur recovery units. Data-driven decisions are needed for engineers to keep on top of operations and prevent issues in design. To meet these standards, oil and gas producers need to make sure their gas treating units are up and meeting requirements, while operating efficiently to maintain competitive margins.ДЄ small operational issue with dehydration, acid gas treating, mercury removal, or sulfur recovery units can result in production loss, or worse: a costly shutdown due to noncompliance. Air emission and sales pipeline standards are set by local and national governments to protect indoor and outdoor air quality. A deep breath of fresh air is often a good way to de-stress, but treating oil and gas products to remove contaminants and ensure fresh air can be a major source of stress.

Aspen hysys depg model