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- Xylene isomers sorption on zeolite betaPublication . Abdelaziz, Bakhta; Silva, José; Adjdir, MehdiThe separation of C8 alkylaromatic mixed compounds is an important process in the chemical industry due to its direct connection with the manufacturing of PET (Polyethylene Terephthalate).The separation can be performed by distillation but the similarity of its boiling points increase significantly the cost. Alternatives are the crystallization and adsorption. In this work it is studied the ability of zeolite BETA to adsorb xylene isomers as a possible alternative adsorbent to the commonly used Faujasite zeolite or Y zeolite in the so called adsorptive process. Zeolite BETA is an intergrowth of two or three polymorphs of crystalline microporous materials formed by tetrahedral corner-sharing TO4 (T = Si or Al) in a unique porous structure with fine thermal and chemical stability. They have found wide spread applications in many industrial field such as catalysis, adsorption, separation, and ion exchange. In this work it is studied the application of Zeolite BETA to separate xylene isomers in vapor phase by adsorption, through an experimental study to determine single component adsorption equilibrium isotherms of xylene isomers and ethylbenzene between the temperatures ranges from 125 to 175ºC. The results obtained in this work are important for further studies in multicomponent systems regarding the ability of zeolite BETA to separate xylene isomers. The adsorbed amount is higher at the lower temperature (125 °C) with values around 0.8 g/100gads and decrease with the increase temperature (175 °C).The adsorption hierarchy order is: EB > OX > PX> MX . The selectivity is very low but we could improve it with decrease the temperature.