Application of Cross‐Flow Microfiltration for Purifying Solvent Naphtha with Ceramic Membranes

Abstract

The microfiltration process of solvent naphtha 200 containing impurities was studied using multichannel ceramic membranes with pore diameters of 0.5 and 0.8 lm. The effects of operating time, transmembrane pressure, cross-flow velocity, and temperature on permeate flux and rejection were investigated. The scanning electron microscop and energy dispersive spectrometry were conducted for the clean and fouled membranes. Effect of backflushing on permeate flux was also studied. Results show that it is possible to recover over 94 % of the original flux by a program of backflushing. A concentration process was carried out and furthermore, various membrane resistances were calculated. Finally, commercial detergent, HNO 3 , and NaOH + NaClO cleaning stages were used for the 0.5-lm membrane.

Cleaning ceramic membranes used in treating desizing wastewater with a complex-surfactant SDBS-assisted method

“…10 shows the variation of flux with cleaning time at different CFVs at TMP = 0.10 MPa and T = 60°C. Crossflow velocity is the driving force for the diffusion of the foulants away from the membrane and increasing CFV was effective to decrease the thickness of filter cake and reduce fouling [10]. An increase in crossflow velocity which resulted in an increase in the shear rate can enhance the mass transfer of the foulants from the membrane surface [14].…”

“…Ceramic membranes hold many advantages over polymeric membranes including thermal and chemical tolerance, resistance to abrasion and mechanical stability [9][10][11][12][13]. They have been used to treat desizing wastewater for recycling refining agent, dispersant, and caustic soda.…”

Water Flux Reduction in Microfiltration Membranes: A Pore Network Study

“…Water reclamation is becoming a critical worldwide issue, in particular for developing countries that have a growing demand for water in agriculture and industry , . For the production of high quality water, several membrane‐based processes including microfiltration, ultrafiltration, and reverse osmosis have been applied . A continued problem hindering the wide use of membranes for water‐treatment processes is fouling, which hinders flow through the membrane and degrades the membrane's performance .…”