11 documents found, page 1 of 2

Osmotic coefficients of alcoholic mixtures containing BMpyrDCA: Experimental de...

The vapour pressure osmometry technique (VPO) has been used to obtain the osmotic coefficients of the binary mixtures of the primary and secondary alcohols 1-propanol, 2-propanol, 1-butanol, 2-butanol and 1-pentanol with the ionic liquid 1-butyl-1-methylpyrrolidinium dicyanamide, BMpyrDCA. From these coefficients, the corresponding activity coefficients and vapour pressures of the mixtures have been also determ...

Laccase recovery with aqueous two-phase systems: Enzyme partitioning and stability

In this work, the potential of several aqueous two-phase systems (ATPS) for laccase recovery was evaluated. For this purpose, different types of ATPS were prepared and the partition coefficient of pure commercial laccase was determined in each one, at 23 C. A total of 21 ATPS were investigated: 12 composed by a polymer and a salt and 9 composed by two different polymers. For polymer-salt ATPS, different composi...

Solubility of hydrofluorocarbons in aromatic solvents and alcohols: Experimenta...

New experimental data of gas solubility of hydrofluorocarbons (CH3F, CH2F2, CHF3 and CF4) in aromatic solvents (benzene, toluene, m-xylene, mesitylene) have been determined. The measurements were performed using a volumetric method with an automated apparatus in the temperature range [288, 308] K and at atmospheric pressure. The gas solubility data of the hydrofluorocarbons in aromatic solvents and in lower alc...

Influence of the structure of the cation of ionic liquids on the vapor pressure...

The osmotic and activity coefficients and vapor pressures of binary mixtures containing the alcohol 1-propanol and the ionic liquids 1-ethyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide, C2MpyNTf2, 1-propyl-3- methylpyridinium bis(trifluoromethylsulfonyl)imide, C3MpyNTf2, 1-butyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide, C4MpyNTf2 and 1-butyl-3-methylpyrrolidinium bis(trifluoromethylsulfonyl...

Biocatalysis in ionic liquids: Degradation of phenol by laccase

The aim of this work was to optimize the reaction conditions for the degradation of phenol in aqueous and ionic liquid (IL)-aqueous solution by biocatalysis using two commercial laccases. In order to evaluate the effect of IL on laccase-mediated reactions, the IL 1-ethyl-3-methylimidazolium ethylsulfate, [C2mim][EtSO4] was selected as reaction media for this study. Preliminary studies for phenol degradation wer...

Physical and excess properties for binary systems containing an alcohol and ion...

In this paper, density, speed of sound and refractive index of six binary systems (alcohol + ionic liquid) were measured, along the whole composition range, at T = 298.15 K and atmospheric pressure. The ionic liquids used in this work are constituted by different cations (pyridinium and pyrrolidinium), anions (trifluoromethanesulfonate and dicyanamide) and alkyl-side chain (propyl- and butyl-). From the experim...

Molecular simulation of absolute hydration Gibbs energies of polar compounds

In this work, we present simulation-based predictions of the absolute hydration energy for several simple polar molecules with different functional groups, as well as for more complex multifunctional molecules. Our calculations were performed using the thermodynamic integration methodology where electrostatic and non-polar interactions were treated separately, allowing for a stable transition path between the e...

Decyl Acetate Synthesis by Enzyme Catalysis in sc-CO2

Kinetic Modelling of Decyl Acetate Synthesis by Supercritical Biocatalysis

The synthesis of decyl acetate, by the transesterification reaction of vinyl acetate withdecanol, was studied using supercritical CO2 as solvent and immobilized Candida antarcticalipase B as catalyst (Novozym 435). The enzymatic content was determined for each particlesize of the catalyst, showing that the smallest particles have a larger specific amount ofenzyme and indicating that the enzyme is located in an ...

Solvent-free Enzymatic Synthesis of Decyl Acetate: the Cherry on Top?

This article presents the results of a building inspection, diagnosis and intervention applied to a significant group of rural houses located in a council at the interior centre of Portugal. The houses external conditions, structural conditions and other aspects related to occupation and use were evaluated by this method. It indicates the necessity of immediate or posterior intervention, on each house, based on...