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Salehi E.,Arak University | Madaeni S.S.,Razi University | Shamsabadi A.A.,Marun Petrochemical Company | Laki S.,Marun Petrochemical Company
Ceramics International | Year: 2014

Fouling and subsequent disruption of filter coalescers due to deposition of coke particles is a crucial concern for petrochemical and oil-refinery plants. Our previous study confirmed that the γ-alumina ceramic microfiltration membranes could successfully remove coke particles from petrochemical oily wastewater. The aim of the current study is preliminary design and economic evaluation for implementation of ceramic membrane unit (CMU), as a pretreatment for coalescer filtration unit, to elucidate the applicability of the process in petrochemical wastewater treatment. Using CMU not only increases the lifetime of the filter coalescers but also introduces a supplementary source for the production of dilution-steam-water (DSW). Two types of ceramic membranes, including 7- and 19-channel modules, were analyzed with the latter providing better performance for the full-scale application. Total number of the required membrane modules was calculated considering the fact that one flow pass through the tubular membrane is adequate for the reasonable elimination of coke particles from the feed. Accordingly, a continuous cross-flow filtration procedure provided with a system of concentrate recycle was suggested. Total capital investment elements were calculated for the CMU implementation. Economic studies showed that the break-even point (BEP) and payback period (PBP) are near 3% and 2 yr, respectively. The results indicated that the CMU is a potential pretreatment for coke removal from petrochemical effluents. © 2013 Elsevier Ltd and Techna Group S.r.l.

Sabzevari S.A.,Isfahan University of Technology | Sabzevari S.A.,Marun Petrochemical Company | Sadeghi M.,Isfahan University of Technology | Mehrabani-Zeinabad A.,Isfahan University of Technology
Macromolecular Chemistry and Physics | Year: 2013

A new model for prediction of the effective permeability of gases in mixed matrix membranes (MMMs), considering the effects of particle shape and the interfacial layer, is presented. The proposed model treats core filler particles and interfacial shell layers as complex particles. Moreover, the Bruggman mathematical procedure is used to improve the accuracy of the presented model for high concentrations of fillers in MMMs. Also, an appropriate uniform criterion is established to make efficient use of the new model for various experimental data to avoid the need for curve-fitting procedures. Finally, the proposed model is examined for several sets of experimental data. A new model is presented for the effective permeability in mixed-matrix membranes. The effects of the interfacial shell layer and particle shape are considered. Furthermore a new criterion is established for estimation of shell-layer properties. The new model and established criterion are evaluated according to experimental data and found to provide a reasonably good fit. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Arabi Shamsabadi A.,Petroleum University of Technology of Iran | Arabi Shamsabadi A.,Marun Petrochemical Company | Kargari A.,Amirkabir University of Technology | Bahrami Babaheidari M.,Petroleum University of Technology of Iran
International Journal of Hydrogen Energy | Year: 2014

In this work, PDMS/PEI membranes were synthesized and sorption and permeation of H2/CH4 mixture were studied. The influence of pressure, temperature and feed composition were investigated. It was shown that permeances increased and selectivity decreased with an increment in the feed temperature. Increasing feed pressure caused a decline in gas permeance and increased selectivity. Higher concentrations of hydrogen in the feed declined the selectivity. The effect of different non-solvents was explained by their effect on precipitation time and it was concluded that water made the membrane denser while isopropanol forms a sponge-like structure. Coagulation bath temperature made the membrane denser. Film casting and dip-coating techniques were used to prepare selective membranes. Obtained selectivity results introduced dip-coating as a better method than film casting. Sequential coating improved selectivity of the prepared membrane. Finally, sequential coating with different concentrations was applied and enhanced selectivity significantly from about 22 to more than 70. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Ahmadpour E.,Petroleum University of Technology of Iran | Shamsabadi A.A.,Petroleum University of Technology of Iran | Shamsabadi A.A.,Marun Petrochemical Company | Behbahani R.M.,Petroleum University of Technology of Iran | And 2 more authors.
Journal of Natural Gas Science and Engineering | Year: 2014

Separation of CO2 from CH4 is a part of gas sweetening process for natural gas treatment. In the present study, Poly (amide - 6 - b - ethylene oxide) (Pebax MH 1657) copolymer was used as a selective layer to prepare PVC/Pebax composite membrane for CO2 capturing. Gas permeation and transport characteristics of single and mixed gases for CO2 and CH4 were investigated and analyzed using constant pressure method. Trans-membrane pressure and temperature were varied from 5 to 15bar and 20-50°C respectively. The temperature dependency of selectivity for CO2/CH4 was decreased noticeably with an increase in temperature, whereas the permeability of both gases increased dramatically. Furthermore, the enhancement of CO2 permeability with increase in gas pressure was probably due to the plasticization of membrane caused by relatively high solubility of CO2 in the membrane. Mixed gases experiments were conducted with different concentration of CO2 at constant temperature and pressure. Permeation measurement showed a steep decline on the membrane selectivity as the partial pressure of CO2 decreased. © 2014 Elsevier B.V.

Saedi S.,Razi University | Madaeni S.S.,Razi University | Shamsabadi A.A.,Marun Petrochemical Company
Chemical Engineering Research and Design | Year: 2014

Polyetherimide (PEI) was used as a polymeric additive for preparing an asymmetric polyethersulfone (PES) membrane for the separation of CO2 from CH4. In pure gas experiments, the higher skin layer thickness and the lower porosity of the sub layer for the membrane prepared from the polymer blend with the composition of 98:2 lead to an increase in CO2/CH4 selectivity and a decrease in the CO2 permeance in contrast with a pristine PES. For higher PEI contents, the higher fractional free volume of the membranes improves the gas permeance and reduces the CO2/CH4 selectivity. The incorporation of PEI in PES reduces the CO2 sorption in PES via decreasing the non-equilibrium free volume and imparts antiplasticization properties to the membrane. © 2014 The Institution of Chemical Engineers.

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