1. INTRODUCTION Air at lower temperatures (-196 o C) becomes in liquid and so can do the distillation of air to its components. Distillation of air is currently the most commonly used technique for production of air component, in industrial scale. Air separation plants are designed to generate oxygen, nitrogen and pure argon from air through the process of compression, cooling, liquefaction and distillation of air. As an experienced and knowledgeable manufacturer of air separation plants with the most advanced technology. Air also using for production of oxygen gas, nitrogen gas, squeezed air, dry air for control and automatisation of devices. The current work aims to describe the air separation process including heat exchange and cryogenic distillation. An ASPEN Plus simulation of cryogenic air separation into Nitrogen, Oxygen and Argon is created. The influence of different process parameters on distillation efficiency is analyzed. INTRODUCTION Air at lower temperatures (-196 o C) becomes in liquid and so can do the distillation of air to its components. Distillation of air is currently the most commonly used technique for production of air component, in industrial scale. Air separation plants are designed to generate oxygen, nitrogen and pure argon from air through the process of compression, cooling, liquefaction and distillation of air. As an experienced and knowledgeable manufacturer of air separation plants with the most advanced technology. Air also using for production of oxygen gas, nitrogen gas, squeezed air, dry air for control and automatisation of devices. The current work aims to describe the air separation process including heat exchange and cryogenic distillation. An ASPEN Plus simulation of cryogenic air separation into Nitrogen, Oxygen and Argon is created. The influence of different process parameters on distillation efficiency is analyzed. Thermodynamic of air separation at 1.4 atmosphere: Figure 1 :T,X,Y- diagram,N 2 – O Figure 2 :X,Y diagram,N 2 - O 2 Figure 3 : T,X,Y- diagram, Ar- O 2 Figure 4 : X,Y- diagram, Ar – O 2 Table 1:results of study state simulation of air distillation process Air separation technology scheme Figure 6: scheme of the air separation C1,C2,C3 are column 2 – S1,S2,S3,S4,S5,B8,B10 are mixers 3-HEO2,HEM2,HE1,HE2,HE3,HE4 are heat exchangers 4 – Expander Aspen simulation of air separation process Calculation of air distillation by McCabe-Thiele method Figure 5: X-Y diagram, vapor and liquid N 2 Composition profile C3 This diagram shows the composition of oxygen, nitrogen and Argon in different stage number of column 3. Composition profile C3 This diagram shows the composition of oxygen, nitrogen and Argon in different stage number of column 3. Figure 6: Composition profile of column C3 Temperature profile C3 This diagram shows the temperature in different stage of column C3. It shows the temperature will be higher up from lower to the bottom of column3 Temperature profile C3 This diagram shows the temperature in different stage of column C3. It shows the temperature will be higher up from lower to the bottom of column3 Figure 7:Temperature profile of column C3 Capital investment costs of air distillation NONameType Direct Cost (USD) NONameType Direct Cost(USD) 1B1DGC CNTRIF1572650015C3- reflux pumpDCP CENTRIF34800 2B2DGC CNTRIF216330016C3-towerDTW TRAYED2758400 3B4DHE FLOAT HEA9050017C4-cnod accDHT HORIZ DRU127200 4C1-cond accDHT HORIZ DRU21950018C4-rebDRB U TUBE65400 5C1- reflux pumpDCP CENTRIF6120019C4-reflux pumpDCP CENTRIF24100 6C1- towerDTW TRAYED45070020C4-towerDTW TRAYED165900 7C2- condDHE FIXED T S57240021ExpanderDTUR TURBOEX63000 8C2 -rebDRB U TUBE14300022HE1DHE FLOAT HEA294600 9C2-reflux pumpDCP CENTRIF33860023HE2DHE FLOAT HEA207200 10C2-towerDTW TRAYED518310024HE3DHE FLOAT HEA278700 11C3-condDHE FIXED T S 25HE4DHE FLOAT HEA374700 12C3-cond accDHT HORIZ DRU14760026HEN2DHE FLOAT HEA94000 13C3- rebDRB U TUBE4160027HEO2DHE FLOAT HEA94000 14total 2513800028total 4582000 TOTAL = 29720000 USD Table 8: calculation of investment costs Technical specifications of KT – 1000 M plant: Volume flow of the air m 3 /hr: High pressure air 800 m3/hr at pressure 160at 5321.4 kmol/hr Low pressure air 3500 m3/hr at pressure 5at 727.5 kmol/hr Volume of producted oxygen 1243.877 kmol/hr Volume of producted nitrogen 4760.309 kmol/hr Volume of producted Argon 44.714 kmol/hr Mol fraction of oxygen 98.7% Mol fraction of nitrogen 99.0% Mol fraction of Argon 99.9 % Technical specifications of KT – 1000 M plant: Volume flow of the air m 3 /hr: High pressure air 800 m3/hr at pressure 160at 5321.4 kmol/hr Low pressure air 3500 m3/hr at pressure 5at 727.5 kmol/hr Volume of producted oxygen 1243.877 kmol/hr Volume of producted nitrogen 4760.309 kmol/hr Volume of producted Argon 44.714 kmol/hr Mol fraction of oxygen 98.7% Mol fraction of nitrogen 99.0% Mol fraction of Argon 99.9 % Using the Peng- Robinson equation of state the isobaric t, xy and x,y diagrams of N 2 - O 2 and Ar-O 2 binary systems at different pressures were calculated: P = 1.4 at SAMRS 2009/09/02 Figure 37: Number of theoretical stages versus Reflux ration in column C3 for, Argon purity: 0.99, Argon recovery:0.999 Optimization of distillation columns parameters

2. Scheme of the air separation process C1,C2,C3 are column 2 – S1,S2,S3,S4,S5,B8,B10 are mixers 3- HEO2,HEM2,HE1,HE2,HE3,HE4 are heat exchangers 4 – Expander, B1, B2 are compressors, B3 and B4 coolers of compressors