Encontrados 11 documentos, a visualizar página 1 de 2
Pre-treatment of lignocellulosic biomass using ionic liquids: wheat straw fract...
Lopes, André; João, Karen; Rubik, Djonatam; Bogel-Lukasik, Ewa; Duarte, Luís C.; Andreaus, Jurgen; Bogel-Lukasik, R.This work is devoted to study pre-treatment methodologies of wheat straw with 1-ethyl-3-methylimidazolium acetate ([emim][CH3COO]) and subsequent fractionation to cellulose, hemicellulose and lignin. The method developed and described here allows the separation into high purity carbohydrate and lignin fractions and permits an efficient IL recovery. A versatility of the established method was confirmed by the IL...
Ionic liquids as a tool for lignocellulosic biomass fractionation
Lopes, André; João, Karen; Morais, Ana Rita; Bogel-Lukasik, Ewa; Bogel-Lukasik, R.Lignocellulosic biomass composes a diversity of feedstock raw materials representing an abundant and renewable carbon source. In majority lignocellulose is constituted by carbohydrate macromolecules, namely cellulose and hemicellulose, and by lignin, a polyphenilpropanoid macromolecule. Between these biomacromolecules, there are several covalent and non-covalent interactions defining an intricate, complex and r...
Ammonium ionic liquids as green solvents for drugs
Melo, Catarina I.; Bogel-Lukasik, R.; Ponte, Manuel Nunes; Bogel-Lukasik, EwaA high solubility of antituberculosis antibiotic drugs: isoniazid and pyrazinecarboxamide in ammonium ionic liquids shown in this work, demonstrates the promising perspectives in the drug processing. Solid–liquid equilibrium (SLE) measurements have been made using a dynamic (synthetic) method. Thermophyscial properties such as melting point, enthalpy of fusion, temperatures of phase transitions and correspondi...
Solubility of pharmaceutical compounds in ionic liquids
Santos, Ana Duarte dos; Morais, Ana Rita; Melo, Catarina I.; Bogel-Lukasik, R.; Bogel-Lukasik, EwaThe solubility of N-acetyl-l-cysteine, coumarin and 4-hydroxycoumarin in alternative solvents was studied in this work. The solid–liquid equilibrium (SLE) measurements have been performed using a dynamic(synthetic) method. Melting points and enthalpies of fusion of the pharmaceutical compounds were acquired using a differential scanning calorimetry (DSC). The solubility of N-acetyl-l-cysteine and 4-hydroxycoum...
Ionic liquids’ cation and anion influence on aromatic amine solubility
Morais, Ana Rita; Lopes, André; Bogel-Lukasik, Ewa; Bogel-Lukasik, R.he mutual solubility of aniline and a series of imidazolium based ionic liquids with bis(trifluoromethylsulfonyl)amide, chloride, dicyanamide, tetrafluoroborate, and hexafluorophospate anions were studied. The produced results show the potential in the new solvent systems which can be used in amine chemistry. The liquid–liquid equilibrium (LLE) and solid–liquid equilibrium (SLE) measurements were performed usin...
Pretreatment and fractionation of wheat straw using various ionic liquids
Lopes, André; João, Karen; Bogel-Lukasik, Ewa; Roseiro, Luísa; Bogel-Lukasik, R.Pretreatment of lignocellulosic biomass with ionic liquids (ILs) is a promising and challenging process for an alternative method of biomass processing. The present work emphasizes the examination of wheat straw pretreatment using ILs, namely, 1-butyl-3-methylimidazolium hydrogensulfate ([bmim][HSO4]), 1-butyl-3-methylimidazolium thiocyanate ([bmim]-[SCN]), and 1-butyl-3-methylimidazolium dicyanamide ([bmim][N(...
Ionic liquids
Bogel-Lukasik, R.; Bogel-Lukasik, EwaIonic liquids (ILs) are a group of interesting compounds that have been known for more than a century, attracting major attention within the last two decades. ILs are often confused with molten salts. ILs are salts with the melting point arbitrarily determined to be below 100°C. They are composed of ions and, thus, each IL possesses unique properties that are the effect of a cation and an anion‘s nature. Howeve...
A favourable solubility of isoniazid, an antitubercular antibiotic drug, in alt...
Forte, Andreia; Melo, Catarina I.; Bogel-Lukasik, R.; Bogel-Lukasik, EwaThe sufficient solubility of isoniazid in alternative solvents obtained in this work can open new perspectives in pharmaceutical processing. Solid–liquid equilibrium (SLE) measurements have been made using a dynamic (synthetic) method. The melting point and the enthalpy of fusion of isoniazid were acquired using differential scanning calorimetry (DSC). The solubility of isoniazid in bis(trifluoromethylsulfonyl)...
Combination of supercritical carbon dioxide and ionic liquid in a novel assembl...
Melo, Catarina I.; Bogel-Lukasik, R.; Bogel-Lukasik, EwaExploitation of neoteric solvents in the efficient total synthesis of carvacrol, an antimicrobial reagent, has been accomplished. The first reaction aimed supercritical mediated heterogeneous hydrogenation of carvone catalysed by palladium. The second step guided to an application of great salvation capacity of ionic liquids in separation of carvacrol from the post-hydrogenation mixture. The process has been co...
A new outlook on solubility of carbohydrates and sugar alcohols in ionic liquids
Conceição, Lucinda J. A.; Bogel-Lukasik, Ewa; Bogel-Lukasik, R.Ionic liquids are innovative media characterised by an easy tunability of physical and chemical properties with the potential for broad usefulness in a wide spectrum of chemical applications. One example of such an application is a complex biorefinery concept leading to the exploitation of the biomass for the production of energy (heat, power, fuel) and value added products. Until now ionic liquids have proven ...
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