Encontrados 29 documentos, a visualizar página 1 de 3
The CO2-assisted autohydrolysis of wheat strawÂ
Silva, Sara P. Magalhães da; Morais, Ana Rita; Bogel-Lukasik, R.The CO2-assisted autohydrolysis was used for wheat straw treatments at temperatures ranging from 180 to 210 °C and an initial CO2 pressure of 60 bar. The study was performed using three different mixture loadings, such as 250 g of H2O/25 g of wheat straw, 150 g of H2O/15 g of wheat straw and 75 g of H2O/7.5 g of wheat straw. The in situ formed carbonic acid was found to result in a higher dissolution of xylose...
Chemical and biological-based isoprene production: Green metrics
Morais, Ana Rita; Dworakowska, Sylwia; Reis, Alberto; Gouveia, L.; Matos, Cristina T.; Bogdal, Dariusz; Bogel-Lukasik, R.Green metrics is a methodology which allows the greenness of either new or already existing processesto be assessed. This paper is a part of a special issue devoted to green metrics in which this methodologyis applied to different processes to assess bio and petrochemical routes. In this work, green metrics wereused as a tool to validate and compare the petrochemical and biological processes of isoprene product...
Green metrics evaluation of isoprene production by microalgae and bacteria
Matos, Cristina T.; Gouveia, L.; Morais, Ana Rita; Reis, Alberto; Bogel-Lukasik, R.Isoprene is a key intermediate compound for the production of synthetic rubber and adhesives and is also used as a building block in the chemical industry. Traditionally, isoprene is obtained from crude oil during the refinery process. Nevertheless, plants and animals are also able to synthesize this important compound. This work compares two renewable approaches for isoprene production: by photosynthetic organ...
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...
Green chemistry and the biorefinery concept
Morais, Ana Rita; Bogel-Lukasik, R.Green Chemistry and Biorefinery concepts are two approaches helping to develop new and more sustainable processes. The implementation of both methodologies impels to fossil-independent future with bioeconomy based on natural feedstock like biowaste and industrial by-products. The development of technologies for valorisation of these resources is a key role of society in the creation of sustainable and more envi...
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...
High pressure vapour-liquid equilibrium of volatiles in supercritical carbon di...
Gurgenova, Karina; Bogel-Lukasik, R.; Wawrzyniak, PawelBinary vapour-liquid equilibrium of thymoquinone and carbon dioxide at the isothermal conditions was carried out at temperature 323.15 K and pressures from 6 to 10 MPa. The experimental data were fitted to the Soave-Redlich-Kwong equation of state. Results could be used for selection of process parameters in separation of volatiles from raw oil or for evaluation of existing separation technologies.
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