Separating chalcopyrite, an important copper-containing ore, from pyrite is an important mineral-processing objective. Herein, we report the synthesis of S-hydroxyethyl-O-isobutyl xanthate (HEIBX), a novel surfactant bearing both hydroxyl and thione groups, through the attachment of a hydroxyeth...

Waxy, normal, and high-amylose maize starches were acetylated to various degrees of substitution (DS) in aqueous medium. A stepwise addition of acetic anhydride enhanced reaction efficiency and DS was in the order of high-amylose maize starch (DS 1.72) > waxy maize starch (DS 1.60) > normal maiz...

The vapour phase infrared contours of the carbonyl stretching of five differently deuterated derivatives of isopropyl chloroformate, and of three differently deuterated derivatives of isopropyl cyanoformate have been investigated. Simulations using rigid asymmetric top calculations of the observ...

Vapor-liquid equilibrium (VLE) data of isopropyl acetate + isopropanol, isopropyl acetate + isopropanol + 1-hexyl-3-methylimidazolium acetate ([HMIM][Ac]), isopropyl acetate + isopropanol + 1-octyl-3-methylimidazolium acetate ([OMIM][Ac]), isopropyl acetate + isopropanol +1-decyl-3-methylimidazo...

A modified biuret method suitable for protein determination of corn-based products was developed by introducing a combination of an alkaline reagent with sodium dodecyl sulfate (reagent A) and heat treatments. The method was tested on seven corn-based samples. The results showed mostly good agre...

Nanostructured indium oxide (In2O3) microcrystals were prepared by calcining hydrothermally synthesized indium hydroxide (In(OH)3) samples. A cubic structure and small crystallite sizes of the In2O3 microcrystals are determined from the X-ray diffraction (XRD) analysis. Observation of the scanni...

Laponite-aminosilane hybrid materials have been prepared by reaction of a chlorosilane, (3-chloropropyl)triethoxysilane, with two aminated compounds, namely, biuret and melamine. The resulting compounds were used for the functionalisation of laponite, using two synthesis procedures. The hybrid m...

As recommended by IFCC, the biuret method is generally used to determine the total protein as a reference method. In order to achieve accurate measurement of the total protein by biuret method, a detailed description of establishment, validation and uncertainty evaluation of this method is propo...

The potential dependent adsorption of urea and its self-condensation product, biuret, have been studied on polycrystalline gold electrodes using electrochemical and in situ infrared spectroscopy. Voltammetry reveals that biuret displays a wider double-layer region compared to its parent compound...

For the purpose of the selective separation of CO2 over CH4, plasma polymerized membranes were prepared. They were multilayer composite membranes consisting of a top plasma polymer layer and a substrate consisting of a silicone skin layer and a porous polyimide support. As monomer, diisopropylam...

A 4-21G conformational analysis with complete geometry optimization was carried out for isobutylamine and diisopropylamine. The results are compared with available geometrical data for similar amines in order to establish general conformational trends.

Diisopropylimine (DIPI) was used as a probe molecule to investigate the hydrogenation of CN on the Ni/Al2O3, Ni/LaAlO and Ni/LaOx catalysts. Microcalorimetric adsorption and infrared spectroscopy were applied to determine the surface bond strengths and structures of the reactant and product. It ...

Densities of the binary mixtures consist of methanol, ethanol, 1-propanol, 1-butanol and 1-pentanol with diisopropylamine were measured at temperatures (293.15, 298.15, 303.15 and 313.15) K and atmospheric pressure. Data were used to calculate the excess molar volumes. All the excess molar volum...

The mutual solubility data of diisopropylamine + water and triethylamine + water systems were measured at the pressure up to 100 MPa and the temperature range was 293.2–316.2 K. Experiments were performed in a high-pressure autoclave with a moveable piston. The experimental data were correlated...

In this study, the reduction of bicarbonate in the presence four amines on a silver oxide/ carbon nanotube (Ag2O/CNT) composite electrode has been investigated. The studied amines includes ethanolamine (MEA), diethylenetriamine (DETA), diisopropylamine (DIPA) and aminoethylpiperazine (AEP). Rega...

In this work, the performance of CO2 absorption into aqueous 1-dimethylamino-2-propanol (1DMA2P) solution was investigated for possible CO2 absorption application and compared with those of MEA and MDEA. The CO2 absorption performance was presented in terms of equilibrium solubility, absorption ...

Pseudo first order rate constants of homogeneous reactions of carbon dioxide (CO2) with primary amines, ethylenediamine (EDA) and 3-amino-1-propanol (3AP), in methanol and ethanol in the concentration range of 20–120 mol m−3; and with tertiary amines, 3-dimethyl-amino-1-propanol (3DMA1P) and 1-...

The proper selection of thermodynamic models is an important step in the design and simulation of CO2 removal processes using amine solutions. In this study, we aim to study the thermodynamic behaviour of the CO2 removal process by employing the extended-universal quasichemical (e-UNIQUAC) model...

In this work, the CO2 absorption performance of aqueous 1-dimethylamino-2-propanol (1DMA2P) was comprehensively investigated in terms of CO2 equilibrium solubility, CO2 absorption rate, CO2 absorption heat, and mass transfer efficiency. The CO2 equilibrium solubility in 2 M 1DMA2P was measured o...

1-Dimethylamino-2-propanol (1DMA2P), a tertiary amine, has been regarded as the promising absorbent with relative higher reaction rate and high capacity for CO2 capture. The CO2 absorption into aqueous 1-Dimethylamino-2-propanol (1DMA2P) solution in the polytetrafluoroethene (PTFE) hollow fiber ...