Current Issue : October - December Volume : 2019 Issue Number : 4 Articles : 5 Articles
A moving boundary model for food isothermal drying and shrinkage is applied to predict the time decay of water content and\nsample volume, as well as water diffusivity for chayote discoid slices in the temperature range 40-70°C. (The core of the model is the\nshrinkage velocity v, assumed equal to the water concentration gradient times a shrinkage function.................
Oil recovery was improved using the tertiary amine, N,N-dimethylcyclohexylamine (DMCHA), a powerful and promissory\nswitchable solvent, in simulated conditions similar to the Colombian crude oil reserves. Firstly, the Colombian crude oil (CCO)\nand the soil were characterized completely. Afterwards, an aged crude-rock system was obtained to use DMCHA that gave an oil\ncrude extraction of 80% in our preliminary studies. ,us, a sand-pack column (soil-kaolin, 95 : 5) frame saturated with CCO was\nused to simulate the conditions, in which DMCHA could recover the oil. After the secondary recovery process, 15.4-33.8% of\noriginal oil in place (OOIP) is obtained. Following the injection of DMCHA, the recovery yield rose to 87-97% of OOIP. Finally,\n54-60% of DMCHA was recovered and reinjected without affecting its potential in the simulated conditions....
Abstract: Being able to control polymorphism of a crystal is of great importance to many industries,\nincluding the pharmaceutical industry, since the crystalâ??s structure determines significant physical\nproperties of a material. While there are many conventional methods used to control the final\ncrystal structure that comes out of a crystallization unit, these methods fail to go beyond a few\nknown structures that are kinetically accessible. Recent studies have shown that externally applied\nfields have the potential to effectively control polymorphism and to extend the set of observable\npolymorphs that are not accessible through conventional methods. This computational study focuses\non the application of high-intensity dc electric fields (e-fields) to induce solid-state transformation of\nglycine crystals to obtain new polymorphs that have not been observed via experiments. Through\nmolecular dynamics simulations of solid-state...........
Naturally occurring nanomaterials are finding growing interests in tailoring properties\nof engineering polymers for advanced applications. The objective of this study was to develop\nenvironment-friendly nanocomposite films by reinforcing kaolinite nanofillers (1-10 wt%) in silicone\nrubber (SR) matrix using a simple solvent casting technique. Kaolinite-reinforced films showed\nsubstantial improvement in mechanical (tensile strength, Youngâ??s modulus, and elongation at break)\nand thermal properties at very low filler loading (5 wt%). The improvement of solvent resistance\nnature of the fabricated films was another critical aspect of this study.........
In this study, vapour-liquid equilibrium of CO2-loaded aqueous potassium salt of L-histidine was studied for a wide range of\ntemperature (313.15-353.15 K), pressure (150-4000 kPa), and solvent concentrations (1-2.5 molar).The experimental results\nshow that L-histidine has an excellent absorptive capacity for carbon dioxide. When compared to conventional solvent\n(monoethanolamine) and amino acid salt (potassium L-lysinate) at similar process conditions, L-histidine has superior absorption\ncapacity. Moreover, modified Kent-Eisenberg model was used to correlate the VLE of the studied system with excellent agreement\nbetween the model and experimental values. The model exhibited an AARE% of 7.87%, which shows that it can satisfactorily\npredict carbon dioxide solubilities in aqueous potassium salt of L-histidine at other process conditions. Being a biological\ncomponent in origin, almost negligibly volatile, and highly resistant to oxidative degradation, L-histidine offers certain operational\nadvantages over other solvents used and has a promising potential for carbon dioxide capture....
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