Semnan University Press Journal of Modeling in Engineering 2008-4854 12 37 2014 08 23 Investigation of pyrolysis temperature effects on diffusion coefficients of oxygen and nitrogen in carbon molecular sieve Investigation of pyrolysis temperature effects on diffusion coefficients of oxygen and nitrogen in carbon molecular sieve 77 87 1673 10.22075/jme.2017.1673 FA Journal Article 2017 01 28 Separation and purification of gases is the most important industrial processes. In this article, adsorption and diffusion of oxygen and nitrogen through carbon molecular sieve (CMS) were investigated. CMS were made by pyrolysis of phenolic resin at three different temperatures, 500, 700 and 800℃ . Micro pore diffusion of oxygen and nitrogen into the CMS adsorbents were studied by volumetric method in batch adsorption unit. The diffusion data were yield from the batch system can be modeled by homogeneous diffusion (long and short time) equation, LDF method and Vermeulen model. The results showed that data of this work were in good agreement with diffusion equation (long time), LDF method and Vermeulen model. Therefore, they could give accurate estimation diffusion time constants of O2 and N2. Also, a comparison of diffusion time constants (DTC) of Oxygen and Nitrogen for different pyrolysis temperatures showed that the DTC of O2 and N2 increase with temperature increasing up to 700 ℃ and decrease with temperature rising to 800℃. In addition, DTC of O2 increase over the temperature range, 500℃ to 800℃. Separation and purification of gases is the most important industrial processes. In this article, adsorption and diffusion of oxygen and nitrogen through carbon molecular sieve (CMS) were investigated. CMS were made by pyrolysis of phenolic resin at three different temperatures, 500, 700 and 800℃ . Micro pore diffusion of oxygen and nitrogen into the CMS adsorbents were studied by volumetric method in batch adsorption unit. The diffusion data were yield from the batch system can be modeled by homogeneous diffusion (long and short time) equation, LDF method and Vermeulen model. The results showed that data of this work were in good agreement with diffusion equation (long time), LDF method and Vermeulen model. Therefore, they could give accurate estimation diffusion time constants of O2 and N2. Also, a comparison of diffusion time constants (DTC) of Oxygen and Nitrogen for different pyrolysis temperatures showed that the DTC of O2 and N2 increase with temperature increasing up to 700 ℃ and decrease with temperature rising to 800℃. In addition, DTC of O2 increase over the temperature range, 500℃ to 800℃. https://modelling.semnan.ac.ir/article_1673_c3e79793df1c0d446899bdedb95de964.pdf