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Dive into the research topics where H. Al-Zoubi is active.

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Featured researches published by H. Al-Zoubi.


Chemical Engineering Journal | 2000

Extraction of jojoba oil by pressing and leaching

Mousa K. Abu-Arabi; Mamdouh Allawzi; H. Al-Zoubi; A. Tamimi

Abstract Jojoba oil extraction by pressing alone, pressing followed by leaching, and leaching alone were investigated. The extraction process by first and second pressing followed by leaching gave about 50% by weight oil with reference to total seed, which is in agreement with what has been reported previously. The extraction by leaching process was carried out using different solvents. These solvents were; hexane, benzene, toluene, petroleum ether, chloroform, and isopropanol. Hexane, benzene, and petroleum ether gave the highest yield (all about 50% by weight oil with reference to total seed), but when cost is considered, petroleum ether is recommended as the best solvent to leach jojoba oil. The yield obtained in this work for leaching by hexane and benzene are 3–5% and about 10% for isopropanol more than those reported in the literature. Traces of solvent remained with the extracted oil after simple distillation followed by a second stage distillation via a Rotavapour apparatus. These traces slightly affected some of the oil properties such as pour point and flash point.


Separation Science and Technology | 2010

Optimization Study for Treatment of Acid Mine Drainage Using Membrane Technology

H. Al-Zoubi; Andre Rieger; P. Steinberger; W. Pelz; Roland Haseneder; Georg Härtel

The use of membrane technology in the treatment of Acid Mine Drainage (AMD) can result in reduction of chemical usage and sludge production making the treatment process more environmentally friendly. This study deals with the optimization of membrane filtration performance in the treatment of AMD using two nanofiltration (NF) membranes (NF99 and DK) and one reverse osmosis (RO). All membranes were used in various tests treating a model solution at two different concentration levels in order to cover the concentration of actual AMD found in the mining industry. The main parameters which were studied to determine the optimal condition for AMD filtration are pressure, pH, temperature, and flow rate. Pressure and temperature were found to have a considerable influence on flux, while rejection was only slightly influenced by pressure. The feed flow rate had no effect on rejection. The highest flux with moderate rejection was determined for NF99 while RO had the lowest flux but highest rejection. Therefore, NF is preferable for AMD treatment due to lowest energy consumption. The treatment has also been tried on a large scale to check its applicability at a commercial scale. Finally, PHREEQC has been used to determine the scaling risk in the prepared AMD.


Separation Science and Technology | 2007

Performance of Nanofiltration Membranes in the Treatment of Synthetic and Real Seawater

Nidal Hilal; H. Al-Zoubi; Naif A. Darwish; Abdul Wahab Mohammad

Abstract Nanofiltration membranes (NF) are being employed in pretreatment unit operations in both thermal and membrane seawater desalination processes and as partial demineralization to seawater. In order to predict NF membrane performance, a systematic study on the filtration performance of selected commercial NF membranes against seawater is presented in this paper. Two commercial nanofiltration membranes (NF90 and NF270) have been investigated in details to study their performance in filtering the salt mixture, synthetic and real seawater in a cross‐flow NF membrane process at a pressure range from 4 to 9 bars. The Spiegler‐Kedem model was used to fit the experimental data of rejection with the permeate flux in order to determine the fitting parameters of the reflection coefficient (σ) and the solute permeability (Ps). The results showed that the rejection increases with pressure for NF90 and slightly increases with pressure for NF270. Also, the NF90 membrane has shown to be able to reject both monovalent and divalent of all investigated mixtures and seawater with very reasonable values but at a relatively low flux. Moreover, it reduced the salinity of investigated seawater from 38 to 25.5 g/L using one stage of the NF membrane at 9 bars. This makes NF90 more suitable for the application in the pretreatment of desalination processes. On the other hand, NF270 can reject monovalent ions at relatively low values and divalent ions at reasonable values. It has also reduced the seawater salinity to 33.6 g/L, but at a very high permeate flux. The SKM model fitted the experimental data of divalent ions in salt mixture and seawater.


Separation Science and Technology | 2005

Nanofiltration of Magnesium Chloride, Sodium Carbonate, and Calcium Sulphate in Salt Solutions

Nidal Hilal; H. Al-Zoubi; Naif A. Darwish; Abdul Wahab Mohammad

Abstract Nanofiltration (NF) membranes have been employed in pre‐treatment unit operations in both thermal and membrane seawater desalination processes. This has resulted in reduction of chemicals used in pretreatment processes as well as lowering the energy consumption and water production cost and, therefore, has led to a more environmentally friendly processes. In order to predict NF membrane performance, a systematic study on the filtration performance of selected commercial NF membranes against brackish water and seawater is required. In this study, three commercial nanofiltration membranes (NF90, NF270, N30F) have been used to treat highly concentrated different salts solutions (MgCl2, Na2CO3, and CaSO4) at salinity level similar to that of brackish water and seawater. The main parameters studied in this paper are salt concentration and feed pressure. The experimental data were correlated and analysed using the Spiegler‐Kedem model. In particular, the reflection coefficient (σ) of all studied membranes and the solute permeability (Ps) have been determined for all membranes and at different salinity levels of studied salts. All the studied membranes fitted the model well for all investigated salts except the experimental data of MgCl2 using N30F membrane, which did not fit well at low rejection. The results showed that NF90 produced a high rejection around 97% for all salts with medium permeate flux while NF270 gave a high flux with medium rejection and N30F gave low rejection and flux.


Desalination | 2004

A comprehensive review of nanofiltration membranes:Treatment, pretreatment, modelling, and atomic force microscopy

Nidal Hilal; H. Al-Zoubi; N.A. Darwish; A.W. Mohamma; M. Abu Arabi


Desalination | 2005

Characterisation of nanofiltration membranes using atomic force microscopy

Nidal Hilal; H. Al-Zoubi; Naif A. Darwish; Abdul Wahab Mohammad


Desalination | 2005

Nanofiltration of highly concentrated salt solutions up to seawater salinity

Nidal Hilal; H. Al-Zoubi; Abdul Wahab Mohammad; Naif A. Darwish


Desalination | 2007

Rejection and modelling of sulphate and potassium salts by nanofiltration membranes: neural network and Spiegler–Kedem model

H. Al-Zoubi; Nidal Hilal; N.A. Darwish; Abdul Wahab Mohammad


Journal of Membrane Science | 2007

Prediction of permeate fluxes and rejections of highly concentrated salts in nanofiltration membranes

Abdul Wahab Mohammad; Nidal Hilal; H. Al-Zoubi; Naif A. Darwish


Chemical Engineering Research & Design | 2007

Neural networks simulation of the filtration of sodium chloride and magnesium chloride solutions using nanofiltration membranes

Naif A. Darwish; Nidal Hilal; H. Al-Zoubi; Abdul Wahab Mohammad

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Abdul Wahab Mohammad

National University of Malaysia

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Naif A. Darwish

Jordan University of Science and Technology

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S. Al-Thyabat

Al-Hussein Bin Talal University

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A. Tamimi

Jordan University of Science and Technology

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Mamdouh Allawzi

Jordan University of Science and Technology

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Marwan M. Batiha

Al-Hussein Bin Talal University

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Mohammad Al-Harahsheh

Jordan University of Science and Technology

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Mousa K. Abu-Arabi

Jordan University of Science and Technology

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Naif A. Darwish

Jordan University of Science and Technology

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