Chemical and Petrochemical Research Center

Baghdad, Iraq

Chemical and Petrochemical Research Center

Baghdad, Iraq
SEARCH FILTERS
Time filter
Source Type

Issa T.T.,University of Baghdad | Jasim F.N.,Chemical and Petrochemical Research Center | Mohammed H.J.,Chemical and Petrochemical Research Center | Abbas Z.K.,Chemical and Petrochemical Research Center
AIP Conference Proceedings | Year: 2017

Different composition of (Sn -Bi) powder of (800-100) μm, grain size were achieved. Three types of alloy were fabricated by melting under (350°C) in inert atmosphere. X-ray diffraction indicated the formation of (Sn-Bi) alloys. Melting points were conducted. Optical micrographic investigated to study the main structure characterization for all fabricated alloys. Hardness test reflect the ductile form for all the three alloys with a remarkable value of 26 HRB for the alloy 40 wt.% Sn-60 wt.% Bi. © 2017 Author(s).


Al-Darkazali H.,Mahidol University | Al-Darkazali H.,Chemical and Petrochemical Research Center | Meevootisom V.,Mahidol University | Isarangkul D.,Mahidol University | Wiyakrutta S.,Mahidol University
International Journal of Microbiology | Year: 2017

A xylanase gene xynAMG1 with a 1,116-bp open reading frame, encoding an endo-β-1,4-xylanase, was cloned from a chicken cecum metagenome. The translated XynAMG1 protein consisted of 372 amino acids including a putative signal peptide of 23 amino acids. The calculated molecular mass of the mature XynAMG1 was 40,013 Da, with a theoretical pI value of 5.76. The amino acid sequence of XynAMG1 showed 59% identity to endo-β-1,4-xylanase from Prevotella bryantii and Prevotella ruminicola and 58% identity to that from Prevotella copri. XynAMG1 has two conserved motifs, DVVNE and TEXD, containing two active site glutamates and an invariant asparagine, characteristic of GH10 family xylanase. The xynAMG1 gene without signal peptide sequence was cloned and fused with thioredoxin protein (Trx.Tag) in pET-32a plasmid and overexpressed in Escherichia coli Tuner™(DE3)pLysS. The purified mature XynAMG1 was highly salt-tolerant and stable and displayed higher than 96% of its catalytic activity in the reaction containing 1 to 4 M NaCl. It was only slightly affected by common organic solvents added in aqueous solution to up to 5 M. This chicken cecum metagenome-derived xylanase has potential applications in animal feed additives and industrial enzymatic processes requiring exposure to high concentrations of salt and organic solvents. © 2017 Hind AL-Darkazali et al.


Ahmad A.L.,Universiti Sains Malaysia | Ahmad A.L.,King Saud University | Abdulkarim A.A.,Universiti Sains Malaysia | Abdulkarim A.A.,Chemical and Petrochemical Research Center | And 2 more authors.
Korean Journal of Chemical Engineering | Year: 2016

The application of response surface methodology (RSM) in preparation and optimization of membranes is important in order to reduce the effort and time needed to achieving an optimum performance. RSM was used to develop an optimum polyethersulfone (PES)/ZnO mixed matrix (MM) membrane for humic acid removal. The MMs were synthesized by dispersing various amounts of hydrophilic ZnO nanoparticles (NPs) into a solution containing PES, polyvinylpyrrolidone (PVP) and dimethylacetamide (DMAc). Flat sheet MM membranes were prepared via the phase inversion method using the central composite design (CCD). The effects of four preparation parameters, such as PES, ZnO, PVP weight percentages and solvent evaporation time, were investigated. Pure water flux (PWF), humic acid flux (HAF) and humic acid rejection (HAR) were selected as a model responses. It was shown that PES and PVP were mainly affected on both PWF and HAF. Furthermore, the interaction effect between PES and ZnO-NPs shows a significant effect on PWF, while the quadratic effects of both solvent’s evaporation time and ZnO-NPs weight percentage coupled with the interaction effect between PES and PVP weight percentage shows the most significant parameters that affects HAR. The optimization method was subjected to maximize all of the PWF, HAF and HAR. It was also determined that the optimized membrane can be synthesized from a solution containing 17.25 wt% PES, 3.62 wt% ZnO and 3.75 wt% PVP with 15 s of solvent evaporation time. The optimum values of PWF, HAF and HAR were 222.3 (L/m2 h), 94.7 (L/m2 h), and 96.34%, respectively. Thus, it can be concluded that the CCD technique is capable of optimizing PES-ZnO membrane performance. © 2016 Korean Institute of Chemical Engineers, Seoul, Korea


Issa T.T.,University of Baghdad | Khaleel S.M.,Chemical and Petrochemical Research Center | Kareem N.A.A.,Chemical and Petrochemical Research Center
AIP Conference Proceedings | Year: 2012

Ceramic compact of MgO +WT% of UBG were sintered at different sintering temperature (700°C, 900°C, 1100°C, and 1300°C), under static air for 3 hours. X-ray diffraction, sintering behavior, optical microscope and brake down voltage were conducted. The maximum sintered density, brake down voltage and best homogenize microstructure were indicated for the compilation of MgO -20 WT % UBG, sintered at 1300°C. © 2012 American Institute of Physics.


Ahmad A.L.,Universiti Sains Malaysia | Abdulkarim A.A.,Universiti Sains Malaysia | Abdulkarim A.A.,Chemical and Petrochemical Research Center | Ooi B.S.,Universiti Sains Malaysia | Ismail S.,Universiti Sains Malaysia
Chemical Engineering Journal | Year: 2013

Polyethersulfone is one of the most important membrane materials and has advantageous chemical and thermal stabilities. With the inherent hydrophobic characteristics of polyethersulfone, this material may be susceptible to fouling during filtration processes. To prevent this fouling, a modification of the membrane is an indispensable step. Various modification techniques had been reported, including the use of additives, chemical treatments, grafting components, and coatings. In this article, the blending/additives modifications of polyethersulfone membranes were performed to increase the membrane flux as well as the hydrophilicity. Three types of additives were introduced, including hydrophilic, amphiphilic, and inorganic materials. The polymeric additives were compatible with good miscibility with the base material, suggesting that these materials may be useful in multiple applications. Several functional groups, such as the sulfonated, pegylated, and carboxylated groups, had excellent miscibility with the polyethersulfone, forming highly hydrophilic membranes with a resistance for protein adsorption. The amphiphilic polymers significantly improved the membrane flux, producing membranes with anti-fouling properties. Several inorganic materials were also used to increase the membrane flux, the hydrophilicity, and the mechanical properties, generating new functional membranes for defined applications. To conclude, the flux enhancement was performed by improvements in the hydrophilicity, roughness, structure, membrane thickness and surface property characteristics of the modified membranes. The blending/additive modifications allowed for improvements in the membrane permeability, the structural features and the surface properties. © 2013 Elsevier B.V.


Abdulhameed A.A.,Universiti Sains Malaysia | Abdulhameed A.A.,Al Adel Health Center | Yang T.A.,Universiti Sains Malaysia | Abdulkarim A.A.,Chemical and Petrochemical Research Center
Polish Journal of Food and Nutrition Sciences | Year: 2016

The aim of this study was to develop a kinetic model to describe the texture and colour changes of chicken sausage during superheated steam cooking. Chicken sausages were cooked at temperature ranging from 150-200°C with treatment times ranging from 2-6 mins. The texture profile was evaluated in terms of hardness, cohesiveness, gumminess, and chewiness, while the colour parameters were estimated in terms of lightness (L∗), redness (a∗), yellowness (b∗), and total colour difference (ΔE). Experimental data showed a gradual reduction in texture parameters as cooking times and temperatures increased. The L∗ value of the colour showed a linear reduction with cooking condition, while the a∗, b∗, and ΔE values showed a contrary effects. The decrease in texture parameters and L∗-value of colour parameter followed the first-order kinetic model. While, zero-order kinetic model was adapted to fit the a∗ and b∗. The modified first order kinetic showed a good fit for total ΔE. Significant correlations between colour and texture parameters were observed, which showed that a∗ alone could be used to predict the texture of chicken sausage. © 2016 Author(s).


Abdulkarim A.A.,Universiti Sains Malaysia | Abdulkarim A.A.,Chemical and Petrochemical Research Center | Ahmad A.L.,Universiti Sains Malaysia | Ismail S.,Universiti Sains Malaysia | Ooi B.S.,Universiti Sains Malaysia
Jurnal Teknologi (Sciences and Engineering) | Year: 2013

Flat sheet polyethersulfone (PES) ultrafiltration membranes were fabricated by a dry/wet induced phase inversion process. Various ranges of ZnO concentrations (from 0 -5 wt. %) were utilized in conjunction with 16.5 and 2.5 wt. % of polyethersulfone and polyvinylpyrrolidone (PVP), respectively. The prepared membranes were characterized using scanning electron microscope (SEM), contact angle (CA), and flux/rejection performance. The modified membranes were tested on humic acid removal. The hydrophilicity of PES membrane was improved after addition of zinc oxide nanoparticles in the casting solution. Highest pure water flux was obtained at 5 wt.% ZnO nanoparticles. The modified membranes with 2.5 wt. % of zinc oxide exhibited higher humic acid flux and rejection. © 2013 Penerbit UTM Press. All rights reserved.


Ahmad A.L.,Universiti Sains Malaysia | Abdulkarim A.A.,Universiti Sains Malaysia | Abdulkarim A.A.,Chemical and Petrochemical Research Center | Ismail S.,Universiti Sains Malaysia | Ooi B.S.,Universiti Sains Malaysia
Desalination and Water Treatment | Year: 2015

Abstract: Zinc oxide nanoparticles (ZnO-NPs) were incorporated into polyethersulfone (PES) matrix to prepare mixed matrix membranes. The separation performance of mixed matrix membranes with respect to humic acid (HA) removal was significantly improved through the addition of ZnO-NPs. The membranes were synthesised by dispersing various amounts of hydrophilic ZnO-NPs (0–3.75 wt.%) into a dope solution containing PES, polyvinylpyrrolidone (PVP) and dimethylacetamide in the appropriate proportions. SEM and AFM were employed to investigate the dispersion of the ZnO-NPs within the polymer matrix and characterise the surface properties of the particles. The pure water flux, HA flux and rejection rate, and the fouling resistance were investigated to evaluate the membrane performance. The characterisation results indicated that all of the PES/ZnO membranes possessed a smaller pore size than that of the pristine PES membrane. The HA rejection rates were observed to increase with the amount of added ZnO. In particular, the PES/ZnO membrane with 1.25 wt.% ZnO exhibited the highest pure water and HA fluxes. Additionally, the fouling analysis revealed that all of the PES/ZnO membranes exhibited a decrease in their HA fouling tendency. © 2014 Balaban Desalination Publications. All rights reserved.

Loading Chemical and Petrochemical Research Center collaborators
Loading Chemical and Petrochemical Research Center collaborators