Print ISSN: 1681-6900

Online ISSN: 2412-0758

Volume 41, Issue 3

Volume 41, Issue 3, March 2023

Research Paper

Optimization of Curing Process for Production of Jatropha Oil Bio-Based Resin Decorated With Nano-Al2O3 and Mechanical Characterization

Agita T. Setiawan; Zurina Z. Abidin; Farah Ezzah Ab Latif; Khalina Abdan

Engineering and Technology Journal, 2023, Volume 41, Issue 3, Pages 1-8
DOI: 10.30684/etj.2022.133859.1209

Concerns on the environment, health and safety issues posed by synthetic resins has amplified numerous efforts of producing resin from various renewable sources. The use of plant oil as potential source of resin has attracted interest from various researchers. Jatropha Oil is a competitive source to petroleum counterparts due to its availability, biodegradability, low eco-toxicity but exhibit poor mechanical properties among many. The objective of this study is to study the effect of adding nanoparticles as reinforcing fillers to bio-based resin from Epoxidized crude Jatropha Oil (ECJO) to improve its mechanical performance. Various loadings of 0% to 4% of Al2O3 nanoparticles was tested on epoxy bio-resin. Later the specimens fabricated were cured and characterized for its mechanical properties. Addition of 1 wt% of Al2O3 nanoparticles improved the tensile strength of a bio-based epoxy resin to tensile stress of 29.37±2.00 MPa, elastic with an elastic modulus of 840.80±124.53 MPa. Further characterization at optimum addition of nano-Al2O3 resulted a glass transition temperature of 37.95˚C. In overall, the inclusion of nano-Al2O3 has definitely improved the mechanical properties of the material which will be useful for further application material engineering.

Review Paper

Applications of Helical Versus Straight Hollow Fiber Membranes: A Review

Adel Zrelli; Jamila Debaya; Abdoulaye Doucoure; Bechir Chaouachi

Engineering and Technology Journal, 2023, Volume 41, Issue 3, Pages 1-11
DOI: 10.30684/etj.2022.134743.1247

The production of straight and helical hollow fibers plays an important role in developing hollow fiber membrane technology that encompasses a broad range of designs. During the last two decades, scientific studies devoted to straight hollow fibers were more abundant than those focused on helical fibers. Several major applications considering side-by-side testing of these two geometries are discussed in this review. For membrane extraction, desalination, and membrane contactor processes, it is observed that permeability rates are 10%-400 % higher for helical fibers compared to straight fibers. This outcome is justified by the presence of Dean-vortices-induced flow turbulences inherent to the geometry of helical membranes. These conditions give rise to an uptake of mass and heat transfer coefficients and a reduction of temperature and concentration polarization phenomena.  Aside from enhanced flow properties, helical hollow fiber bundles tend to be more robust by design, thus exhibiting better resiliency over long service operations than straight bundles. One persistent shortcoming of the helical fibers seems to be an increase in pressure drop. However, this does not always translate into a higher energy consumption – i.e., versus straight bundles. Given the performance advantage, product robustness, and adaptiveness to a broad range of applications, the adoption of helical hollow fiber technology deserves growing support from the membrane community in academic and industrial settings.

Research Paper

Clathrate-Based Recovery of Sulfuric Acid from Spent Acid

Najlaa J. Lazim; Riyadh S. AlMukhtar

Engineering and Technology Journal, 2023, Volume 41, Issue 3, Pages 1-9
DOI: 10.30684/etj.2022.136228.1308

Recently, the applications of hydrate phenomena in industrial processes have been increasing. A clathrate or hydrate is a solid, ice-like compound that forms when water/guest is mixed under certain conditions. Hydrogen water molecules bond with the guest molecules to form a crystal lattice. Different guests can form the Clathrate (e.g., gases or liquids). Dilute Sulfuric acid is usually generated at different industrial plants, and these dilute acids are considered waste because they cannot be reused again. Many treatment processes handle this environmental problem, like electrochemistry, precipitation, adsorption, membrane filtration, and ion exchange. Although such processes have significant operational advantages, their disadvantage is that many of the high costs of the treatment process and the generated products of treatment are considered toxic pollutants. This work utilized clathrate phenomena experiments to re-concentrate dilute sulfuric acid. The selected clathrate guest was Cyclopentane. Each experiment s consists of a mixture of Cyclopentane and dilute sulfuric acids. The volume ratios of dilute sulfuric acid to Cyclopentane were (6:1, 4: 1, 3:1, and 2:1) with different initial concentrations (12.5%, 10%, 7.5%, 5%, 2.5%) of acid. It was found that the clathrate method was effective in re-concentrate dilute sulfuric acids with a maximum efficiency of 94% at the ratio of acid /cyclopentane (6:1) at 12.5% concentration. It can be concluded that the increase in dilute sulfuric acid /cyclopentane volume ratio leads increasing in removal efficiency while reducing the yield percentage and enriched Factor.