Dearomatization of normal paraffin by adsorption process using synthesized NaX zeolite

Petroleum Science, Aug 2013

Linear alkyl benzenes (LABs) are the main materials for detergent production. The presence of aromatic compounds in this material can decrease the quality of the final product and enhance the deactivation rate of catalysts. In this research we used zeolite NaX for de-aromatization of the recycled paraffin from the alkylation unit of an LAB production complex. The effect of different parameters on the removal efficiency of adsorbent was studied and optimized. To study the re-usability of the adsorbent, the breakthrough curves were obtained by using a fixed bed column filled with the adsorbent. The results indicated that the adsorbent capacity remained unchanged after three regeneration cycles. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. It was concluded that the Langmuir model agreed well with the experimental data. The calculated thermodynamic parameters of the adsorption showed that the adsorption process was spontaneous and exothermic. The reaction rate was estimated by the pseudo-second order kinetic model.

A PDF file should load here. If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a PDF plug-in installed and enabled in your browser.

Alternatively, you can download the file locally and open with any standalone PDF reader:

https://link.springer.com/content/pdf/10.1007%2Fs12182-013-0289-y.pdf

Dearomatization of normal paraffin by adsorption process using synthesized NaX zeolite

Hossein Faghihian Leila Riazi - 1 Introduction 2 Material and methods 2.1 Synthesis and characterization of NaX zeolite 2.2 Adsorption experiment 2.2.1 Effect of initial aromatics concentration on adsorption of the adsorbent 2.2.2 Effect of temperature on adsorption of the adsorbent 2.3 Regeneration of adsorbent N2 bed tro Product drum 3 Results and discussion 3.1 Characterization of adsorbent N2 HPLC pump Feed drum Fig. 2 4000 3500 3000 2500 2000 1500 1000 500 Wave number, cm-1 475 2 , degree Fig. 5 3.2 Adsorption studies 3.3 Equilibrium modeling Initial aromatics Concentration, wt% 300 320 340 360 380 400 420 440 Temperature (T), K C q e e q 1 max b q C e max q C q q b C q L / g , e q/ e C 2.2 2.0 1.8 1.6 1.4 1.2 1.0 log q e log K f (1 n) log C e K C n n q 2.0 2.5 C Ci CeCe Vm ( RHT ) ( RS ) G H T S H G 3.5 Kinetics of adsorption S t qt q (a) Acknowledgements 30 40 2 , degree 5 10 20


This is a preview of a remote PDF: https://link.springer.com/content/pdf/10.1007%2Fs12182-013-0289-y.pdf

Faghihian Hossein, Riazi Leila. Dearomatization of normal paraffin by adsorption process using synthesized NaX zeolite, Petroleum Science, 2013, 408-414, DOI: 10.1007/s12182-013-0289-y