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 CNTRIF C3- reflux pumpDCP CENTRIF B2DGC CNTRIF C3-towerDTW TRAYED B4DHE FLOAT HEA C4-cnod accDHT HORIZ DRU C1-cond accDHT HORIZ DRU C4-rebDRB U TUBE C1- reflux pumpDCP CENTRIF C4-reflux pumpDCP CENTRIF C1- towerDTW TRAYED C4-towerDTW TRAYED C2- condDHE FIXED T S ExpanderDTUR TURBOEX C2 -rebDRB U TUBE HE1DHE FLOAT HEA C2-reflux pumpDCP CENTRIF HE2DHE FLOAT HEA C2-towerDTW TRAYED HE3DHE FLOAT HEA C3-condDHE FIXED T S 25HE4DHE FLOAT HEA C3-cond accDHT HORIZ DRU HEN2DHE FLOAT HEA C3- rebDRB U TUBE HEO2DHE FLOAT HEA total total TOTAL = 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 kmol/hr Low pressure air 3500 m3/hr at pressure 5at kmol/hr Volume of producted oxygen kmol/hr Volume of producted nitrogen kmol/hr Volume of producted Argon 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 kmol/hr Low pressure air 3500 m3/hr at pressure 5at kmol/hr Volume of producted oxygen kmol/hr Volume of producted nitrogen kmol/hr Volume of producted Argon 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

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