60 research outputs found
High-pressure Solubility of Carbon Dioxide in Aqueous Sodium L- Prolinate Solution
No full textAbstractAn experimental evaluation of CO2 solubility in aqueous sodium L-prolinate (SP) solution was carried out using high-pressure solubility equipment at three different temperatures, 303.15, 313.15, and 333.15K. The study was conducted over the pressure range from 2 to 60bar for 30wt. % SP solution. It was found that, the CO2 loading (mole of CO2 / mole of SP) decreases with increasing temperature, while it increases with increasing the pressure of gas. ANOVA analysis was carried out to determine the statistical significance of the solubility data with respect to temperature and pressure. The CO2 loading of aqueous SP solution was also compared with MEA and aqueous sodium glycinate (SG) solution. It was observed that the aqueous SP solution has higher CO2 loading capacity as compared to 30wt. % MEA, and comparable with aqueous 30wt. % SG solution
Extraction of benzene and cyclohexane using [BMIM][N(CN)2] and their equilibrium modeling
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Physical Properties of Aqueous Sodium Salt Solution of α-Methylalanine (Na-AMALA)
No full textAbstractThe density, viscosity and refractive index of aqueous sodium salt of α-methylalanine (Na-AMALA) have been measured over the temperature range from (298.15 to 333.15) K in the mass fraction range of (0.05 to 0.30). Based on the results obtained, the three physical properties of the aqueous Na-AMALA solutions were found to decrease with the increasing temperature and increase with increasing concentration. Each physical property was correlated as a function of temperature by least-squares method, and the corresponding coefficients for each property were reported here. All properties were correlated well over the whole range of temperatures and concentrations. The determination of the thermal expansion coefficients of Na-AMALA solutions by using measured density was shown increased consistently with the increasing the temperatures and concentrations
Thermal Stability and Kinetic Study of Benzimidazolium Based Ionic Liquid
No full textAbstract3-methyl-1-(4-sulfo-butyl)-benzimidazolium trifluoromethanesulfonate [BSMBIM][CF3SO3] as a new ionic liquid (IL) was synthesized and their structure was confirmed by NMR, FTIR and CHNS technique. The IL thermal stability is of the great significance for their applications. This IL thermal stability was investigated by TGA from 373.15-873.15K with different heating rates (10, 15 and 20oC). The activation energy and pre-exponential factor were also evaluated using Kissinger (171.01 KJ/mol and 9.88×1012 min-1), Ozawa (172.60 KJ/mol and 13.76×1012 min-1) and Starink (171.30 KJ/mol and 10.50×1012 min-1) methods, respectively
Mercury Removal of Fluctuating Ethane Feedstock in a Large Scale Production by Sulphur Impregnated Activated Carbon
No full textAbstractAbstract — The removal of mercury from entering process area is the key to safeguard aluminum brazed heat exchanger and other critical equipment in the ethylene production plant from Liquid Metal Embrittlement (LME) and amalgam corrosion. Sulphur Impregnated Activated Carbon (SIAC) is the proven technology for mercury removal. However, currently there is no specific study conducted at fluctuating ethane feedstock to monitor its functionality and performance. This study is conducted at a large scale of aging ethylene plant without Ethylene Buffer Storage Tank (EBST) which results in fluctuating feedstock upstream of mercury removal vessel. Number of experiments and data gathering were done by observing current mercury level at various process stream to determine its performance before and after installation. Analysis performed at mercury removal vessel's outlet indicates consistent decrease in adsorption capacity with an increase of temperature. The fluctuation of ethane feedstock from 35,000kg/hr to 71,000kg/hr also results in less adsorption efficiency of SIAC
Synthesis of CaO-based Sorbent from Biomass for CO2 Capture in Series of Calcination-carbonation Cycle
No full textAbstractThis paper described CO2 capture performance of CaO-based sorbents which were derived from biomass mixture within 9 cycles of calcination-carbonation conducted in TGA. The study utilized commercial sorbent to configure the suitable calcination and carbonation condition as a reference to synthesis biomass-derived sorbent. Calcination was conducted at 850°C in pure N2 atmosphere for 20min while carbonation occurred at 800°C in pure CO2 environment for 30min. Cockle shells (CS) were utilized as the main precursor to synthesize CaO and its capture performance was enhanced by adding 20wt.% biomass of rice husk (RH), empty fruit bunch (EFB) and palm kernel shell (PKS). Biomass addition to CS has increased CO2 capture capacity of the derived sorbents. The highest CO2 captured was obtained by fresh sorbent of CS with EFB which is 8% higher than non-mixed CS sorbent. However after regeneration, CS with CBA sorbent illustrated the highest capture capacity among all sorbents at every cycle. The derived CS with EFB sorbent also demonstrated the most cyclic-stable material due to minimum loss of CO2 captured capacity. Overall, application of biomass-derived CaO-sorbent in a series of calcination-carbonation cycle is promising CO2 capture development
Metal-Organic Frameworks: Screening M-MOF-74 (M = Co, Cr, Cu, Fe, Mg, Mn, Ni, Ti, and Zn) Based for Carbon Dioxide Adsorption
No full textThe release of carbon dioxide in the environment is increasing yearly due to human activities and it will affect greenhouse gas. To overcome this issue, adsorption technology found to be the best candidate due to its performance to capture high CO2 with lower capital cost. Much attention has focused on metal-organic framework (MOF) due to high potential of CO2 capture compared with conventional adsorbents. More research has been done on MOF-74 due to presence of the open-metal site that favors CO2 binding. The presence of metal in MOF-74 able to give higher surface area and porosity of the molecules thus result in higher adsorption of CO2. However, there is limited research related to metal in MOF-74 where most focused on the Mg-MOF-74 due to its ability to adsorb twice of CO2 compared with zeolites. Yet, Mg-MOF-74 found to lose stability in presence of water where it's only able to recover 15% from initial adsorption. Synthesizing MOF-74 requires high cost and providing not a promising result for each synthesizes. Thus, this paper introduces to screen MOF-74 for different metal centers using modeling approach by Material Studio. As result, Ni-MOF-74 shows the highest adsorption of CO2 with 12.35mmol/g compared to other metals
Effect of Liquid Flow Rate and Amine Concentration on CO 2 Removal from Natural Gas at High Pressure Operation in Packed Absorption Column
No full textAbstract. Greenhouse gas (GHG) emissions such as carbon dioxide (CO 2 ) and methane (CH 4 ) from oil and natural gas operation at offshore platforms have significant contribution to global warming. The reduction of these GHG emissions is possible through CO 2 capture technology. This study reports the absorption performance of monoethanolamine (MEA) for the removal of CO 2 from natural gas (NG) at high pressure conditions. The absorption experiments were performed in an absorption column packed with Sulzer Metal Gauze Packing at 5.0 MPa operating pressure. The absorption performance was evaluated in terms of CO 2 removal (%) with liquid flow rate ranging from 1.81 to 4.51 m 3 /m 2 .h and MEA concentration of 1.0 -4.0 kmol/m 3 . It was found that CO 2 removal (%) had increased with increasing liquid flow rate and MEA concentration
Effect of Reaction Time on Green Synthesis of Gold Nanoparticles by Using Aqueous Extract of Elaise Guineensis (Oil Palm Leaves)
No full textAbstractIn this research gold nanoparticles (AuNPs) were synthesized by using aqueous extract of Elaeis guineensis (oil palm) leaves. Effects of reaction time on rate of reduction, size of particles and stability of gold nanoparticles were investigated. Reduction of gold precursor to form gold nanoparticles was monitored by recording SPR wavelength on a UV-vis spectrophotometer. SPR wavelength and maximum absorbance of the reaction medium reached a plateau after 60min of reaction indicating complete reduction of gold precursor to gold nanoparticles. DLS measurements showed that polydispersed gold nanoparticles with average hydrodynamic diameter of 55.22 ± 42.86nm were formed during the AuNPs synthesis reaction. Synthesized gold nanoparticles with zeta potential value of -14.7mV were stable for 30 days
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