Process optimization studies of p-xylene separation from binary xylene mixture over silicalite-1 membrane using response surface methodology

Xylene isomerization kinetic over acid-functionalized silicalite-1 catalytic membranes: Experimental and modeling studies

“…Fig. 5a shows XRD pattern of parent silicalite-1 membrane reported in our previous work [16]. Propylsulfonic acid-functionalized silicalite-1 membrane (MAFS-P10) (Fig.…”

“…by considering three strong peaks at 2Â ∼ 7.7 • , 8.8 • and 23 • , and silicalite-1 membrane reported in our previous work [16] was used as reference.…”

“…Acid-functionalized silicalite-1 membranes were synthesized on a porous ␣-alumina support by in situ hydrothermal crystallization method as reported in our previous work [16,17]. Firstly, a porous ␣-alumina support (diameter = 25 mm, thickness = 3 mm) was coated with a thin silica layer using sol-gel technique [19].…”

“…Due to the higher diffusion rate of p-xylene compared to m-xylene and o-xylene, p-xylene could be separated though silicalite-1 membrane [14][15][16]. However, silicalite-1 is catalytically inactive in its pure form (an aluminum-free analogue of ZSM-5 (Si/Al = ∞)).…”

Selective Cracking of Durene to Para-Dimethyl Benzene over ZSM-5 Zeolite

“…In the industry, p-xylene is used as a source for large scale manufacture of the chemical and pharmaceutical intermediate, terephthalic acid, which is further used in the production of polyester resin and fibers. In traditional process, p-Xylene is separated from the BTX aromatics (benzene, toluene and the xylene isomers) through the catalytic reforming of petroleum naphtha by series of distillation, adsorption or crystallization, however, these separation methods are difficult to conduct because the xylene isomers have similar boiling point [3], in additional, they need more energy for their recovery [4].…”