International Journal of Advanced Scientific and Technical Research Issue 5 volume 4, July-August 2015 Available online on http://www.rspublication.com/ijst/index.html ISSN 2249-9954 RSPUBLICATION, rspublicationhouse@gmail.com Page 742 Numerical Simulation to Optimize Di-Ethanol-Amine (DEA) Strength for Achieving the Highest Methane Purity from Biogas Sameh Tawfik Abd Elfattah #1 ,Yehia A. Eldrainy #2 and Abdelhamid Attia #3 #1 Mechanical power department,Faculty of engineering, Alex university, Egypt, Phone no(+2-0100-1808-616), Email (sameh_tawfeek@hotmail.com) #2 Mechanical power department, Faculty of engineering, Alex university, Egypt, Phone no (+2-0101-5393-646), Email (yeldrainy@alexu.edu.eg) #3 Mechanical power department, Faculty of engineering, Alex university, Egypt, Phone no (+2-0122-3261-171), Email (abdelhamid28_eg@yahoo.com) ABSTRACT Biogas has to be purified to meet the quality standards. Carbon dioxide (CO 2 ) hydrogen sulfide (H 2 S) and other sulfide compound are the main acid gases that may require complete or partial removal. Thus, acid gas removal simulation is an essential tool for control and operations in gas processing plant. Process simulator, plays an important role to accomplish these objective.This paper aims to determinethe optimum DEA (Di-Ethanol-Amine)strength to achieve the highest methane purity from Biogas using Aspen HYSYS simulation program.This simulation will use the DEA amine solvent with different strength for removing the CO 2 and H 2 S simultaneously from an amount of feed biogas that has total volume flow rate about 13 m 3 /h. Twenty stages of PSA (Pressure Swing Absorber) absorption columns which operate at pressure ranging from 25 to 26 bar and at temperature of nearly 43 C.The results of this simulation process shows that pure methane (99 % purity) with zero percentage of CO 2 and H 2 S is obtained at an optimum value of 0.3 of DEA strength. Key words:Biogas, DEA, Aspen HYSYS, pure methane. INTRODUCTION Biogas[1,2,3] has to be purified to meet the quality standards[4] specified by the major pipeline transmission and distribution companies since the biogas contains others impurities such as liquids, sand, mercury and other gasses like nitrogen, helium and acid gases (carbon dioxide, hydrogen sulfide)[5]. Carbon dioxide (CO 2 ) hydrogen sulfide (H 2 S) and other sulfide compound are the main acid gases that may require complete or partial removal as they can