New configuration of the zero-length column technique to determine the diffusion coefficients and isotherms of pure components and mixtures in molecular sieves
DOI:
https://doi.org/10.46842/ipn.cien.v26n1a01Keywords:
Zero-length column, diffusion, hydrocarbon separationAbstract
A new configuration of the zero-length column (ZLC) technique was developed, which allows the use of different chromatography variants to quickly determine the diffusion coefficients and isotherms of pure components and mixtures in molecular sieves. The innovative design allows all studies to be performed on a single sample, facilitating the use of the parameters in theoretical models or molecular simulations. One of the key features of the new system is that it is possible to carry out the adsorption and separation process of olefins and paraffin using 5 to 15 mg of the adsorbent. By means of two flame ionization detectors, it is possible to determine the composition at the outlet of both columns and to study the desorption profiles. Through two 4- and 6-way valves communicating with two pairs of mass flow controllers, a configuration for kinetic and equilibrium measurements was designed. With the help of LabVIEW software and DAQ cards, the whole experimental process was managed. The new ZLC setup was applied to study the adsorption and separation of CH4 and C2H5 on zeolite 5A, with which the new experimental setup was validated.
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