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Licensed Unlicensed Requires Authentication Published by De Gruyter April 2, 2020

ASU Simulation in Separating Air Components by Refrigeration Distillation (Oxygen and Nitrogen) Using ASPEN HYSYS (Case Study: SIAD Company)

Afshar Alihosseini ORCID logo


Currently, air separation units (ASUs) have become very important in various industries, particularly oil and petrochemical industries which provide feed and utility services (oxygen, nitrogen, etc.). In this study, a new industrial ASU was evaluated by collecting operational and process information needed by the simulator by means of HYSYS software (ASPEN-ONE). The results obtained from this simulator were analyzed by ASU data and its error rate was calculated. In this research, the simulation of ASU performance was done in the presence of an expansion turbine in order to provide pressure inside the air distillation tower. Likewise, the cooling capacity of the cooling compartment and the data were analysed. The results indicated that expansion turbine is costly effective. Notably, it not only reduces the energy needed to compress air and supply power of the equipment, but also provides more cooling power and reduces air temperature. Moreover, turbines also increase the concentration of lighter gas products, namely nitrogen.


  1. In this study, a new industrial ASU was evaluated by collecting operational and process information needed by the simulator by using HYSYS software (ASPEN-ONE) and the results obtained from this simulator were analyzed by ASU data and its error rate was calculated.

  2. Simulation of ASU performance was done in the presence of an expansion turbine in order to provide pressure inside the air distillation tower that this is a novelty to previous studies.

  3. Detailed instrument as: heat exchanger, cooling tower, expansion turbine, distillation tower, networks for each configuration of the process are designed

  4. Expansion turbine increases nitrogen concentration and decreases oxygen and argon concentration and simulation results in the presence of turbine are very close to experimental and actual results.

  5. The cooling power provided by the expansion turbine for the unit is 1980 kW, which is why the air temperature is lowered.


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Received: 2019-06-06
Revised: 2019-10-03
Accepted: 2019-10-08
Published Online: 2020-04-02

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