10 documents found, page 1 of 1
Deterpenation of citrus essential oil via extractive distillation using imidazo...
Vilas-Boas, Miguel; Batista, Fábio R.M.; Dias, Rafael M.; Coutinho, João A.P.; Ferreira, Olga; Costa, Mariana C.; Pinho, SimãoThe deterpenation of citrus essential oils (CEO) is crucial in many industries to promote the stability and preserve the organoleptic properties of the final product, improving considerably the oxygenated fraction purity. Methods: Two imidazolium ionic liquids (ILs), [C4mim][OAc] and [C4mim]Cl, were applied as novel separation agents in a deterpenation process constituted by an extractive distillation column an...
Flash point of binary and ternary monoterpene mixtures: experimental and modeling
Vilas-Boas, Sérgio M.; Nascimento, Debora C. do; Dias, Rafael M.; Rozo, Gabriel H.; Neto, Antonio M.B.; Ferreira, Olga; Pinho, Simão; Costa, Mariana C.The flash point (FP) of pure or mixtures of flammable substances is an important indicator in designing fire risk mitigation and prevention measures in the chemical and oil industry. Although FP data of fuel constituents and blends are often found in the literature, studies addressing other flammable mixtures, such as essential oils (EOs) and their constituents (terpenes and terpenoids), are scarce. EOs are aro...
Octanol–water partition coefficients and aqueous solubility data of monoterpeno...
Vilas-Boas, Sérgio M.; Costa, Mariana C.; Coutinho, João A.P.; Ferreira, Olga; Pinho, SimãoTerpenes and terpenoids encompass one of the most extensive and valuable classes of secondary metabolites. Their ten-carbon-containing oxygenated representatives, monoterpenoids, are the main components of plant essential oils, being widely exploited in the cosmetic, pharmaceutical, and food industrial areas. Due to its widespread use, it is crucial to investigate their environmental distribution. Thus, new wat...
Conversion of organosolv and kraft lignins into value-added compounds assisted ...
Sosa, Filipe H. B.; Bjelić, Ana; Coutinho, João A. P.; Costa, Mariana C.; Likozar, Blaž; Jasiukaitytė-Grojzdek, Edita; Grilc, MihaIn this study, an acidic deep eutectic solvent (DES) was used as a benign solvent to valorise technical lignins by breaking down their structure into value-added aromatic compounds. The action of an acidic DES composed of cholinium chloride ([Ch]Cl) and oxalic acid (Oxa), at a molar ratio of 1 : 1, towards the depolymerisation of Kraft and Organosolv lignins (KL and OL) was studied under mild conditions (80 °C,...
Surface crystallization of ionic liquid crystals
Martins, Mónia A.R.; Carvalho, Pedro J.; Alves, Douglas; Dariva, Cláudio; Costa, Mariana C.; Ferreira, Rute A.S.; André, Paulo S.; Morgado, PedroThe evidence for surface crystallization in ionic liquids is scarce. The existing reports seem to be contradictory as for its driving forces, since in the two compounds investigated in the literature, the contribution of coloumbic and van der Waals forces is very different. In this work 1-dodecyl-3- methylimidazolium tetrafluoroborate was studied and its surface crystallization characterized by surface tension,...
Binary mixtures of fatty acid ethyl esters: solid-liquid equilibrium
Boros, Laslo A.D.; Batista, Marta L.S.; Coutinho, J.A.P.; Krahenbuhl, M.A.; Meirelles, Antonio J.A.; Costa, Mariana C.Biodiesel is a renewable fuel that is commonly used in diesel engines around the world mostly in blends with the conventional diesel. There are many studies concerning its production and its properties and a series of them confirms the biodiesel advantages when compared with conventional diesel in relation of the environmental impacts. In spite of many advances concerning the biodiesel production and prop ertie...
Binary mixtures of fatty acid ethyl esters: Solid-liquid equilibrium
Boros, Laslo A. D.; Batista, Marta L. S.; Coutinho, J. A. P.; Krahenbuhl, M. A.; Meirelles, Antonio J. A.; Costa, Mariana C.Biodiesel is a renewable fuel that is commonly used in diesel engines around the world mostly in blends with the conventional diesel. There are many studies concerning its production and its properties and a series of them confirms the biodiesel advantages when compared with conventional diesel in relation of the environmental impacts. In spite of many advances concerning the biodiesel production and properties...
Lipidic Protic Ionic Liquid Crystals
Maximo, Guilherme J.; Santos, Ricardo J. B. N.; Lopes-da-Siva, Jose A.; Costa, Mariana C.; Meirelles, Antonio J. A.; Coutinho, Joao A. P.Protic ionic liquids (PILs) based on lipidic compounds have a range of industrial applications, revealing the potential of oil chemistry as a sustainable basis for the synthesis of ionic liquids. PILs of fatty acids with ethanolamines are here disclosed to form ionic liquid crystals, and their mixtures with the parent fatty acids and ethanolamines display a lyotropic behavior. Aiming at characterizing their rhe...
Generating Ionic Liquids from Ionic Solids: An Investigation of the Melting Beh...
Maximo, Guilherme J.; Santos, Ricardo J. B. N.; Brandao, Paula; Esperanca, Jose M. S. S.; Costa, Mariana C.; Meirelles, Antonio J. A.; Freire, Mara G.Mixtures of ionic liquids (ILs) allow enlarging the plethora of the physical and chemical properties of these materials in addition to the well-known tunable character associated with pure compounds. It is shown here that mixtures also induce a significant decrease of the melting points of the mixture to values well below those of the original compounds allowing the tuning of the melting point of an ionic liqui...
Trends and demands in the solid-liquid equilibrium of lipidic mixtures
Maximo, Guilherme J.; Costa, Mariana C.; Coutinho, Joao A. P.; Meirelles, Antonio J. A.The production of fats and oils has a remarkable impact on economy, in particular, in the developing countries. To deal with the upcoming demands of the oil chemistry industry, studying the solid-liquid equilibrium of fats and oils is highly relevant because it may support the development of new processes and products, as well as improve existing processes and products. However, this task is challenging because...