دوماهنامه مهندسی شیمی ایران
پیاپی 53 (بهمن و اسفند 1389)

Compressibility factor (z-factor) values of natural gases are necessary in most petroleum engineering calculations. Necessity arises when there are no available experimental data for the required composition, pressure and temperature conditions. One of the most common methods of calculating z-factor values is empirical correlation.Firstly, a new correlation based on the famous Standing-Katz (S-K) Chart is presented to predict z-factor values. The advantage of this correlation is that it is explicit in Z and thus does not require an iterative solution as is required by other methods, so it can be utilized at PLC (Programmable Logic Controller) system simply. Secondly, the comparison between new one and other correlations is carried out and the results indicate the superiority of the new correlation over the other correlations used to calculate z-factor.

In this work, some adsorbents that are used to separate carbon dioxide from flue gases, are investigated since much of carbon dioxide as air pollutant released to the atmosphere is from flue gases. Different types of activated carbons, Zeolites, MCMs, HTlcs, Metal oxides and carbon nanotubes are among the adsorbent that are investigated extensively by scientists. At high temperature and atmospheric pressure, basic alumina and HTlcs show suitable results. Under the same conditions, activated carbon has also shown medium adsorption. Also, impregnation of activated carbon by basic reagent increased carbon dioxide adsorption. Although, activated carbon at high temperature has less uptake than basic alumina, the adsorbent price, availability of raw material and a medium level of adsorption, make activated carbon is more suitable than other adsorbents. Also it is important to consider the type of raw material and activation and impregnation methods that can affect the level of uptake.