17 research outputs found
Decomposition of chloroform and succinic acid by ozonation in a suction-cavitation system: Effects of gas flow
Microwave-Assisted Chemistry â A Stock Taking
In 1986 Gedye and Giguere published the first important articles on the influence of microwaves (2.45 GHz) on syntheses undertaken in household ovens. Over the past 20 years there have been various developments in different directions reflecting a steadily growing interest in this innovative
field. This mini-overview focuses on selected details of reaction engineering in microwave chemistry
Microwave-Assisted Extraction â A State-of-the-Art Overview of Varieties
The microwave-assisted extraction technique offers some advantages over conventional extraction methods. Applications include the extraction of high-value compounds from natural sources including nutraceutical and functional food ingredients, pharma actives from biomass, and phytonutrients.
Compared to conventional solvent extraction methods, the microwave-assisted extraction (MAE) technique offers advantages such as improved stability of products and marker compounds, increased purity of crude extracts, the possibility to use less toxic solvents, reduced processing costs, reduced
energy and solvent consumption, increased recovery and purity of marker compounds, and very rapid extraction rates
Ionic liquids and their heating behaviour during microwave irradiation - a state of the art report and challenge to assessment
Decontamination of soil containing POPs by the combined action of solid Fenton-like reagents and microwaves
Biomass-Derived Platform Chemicals: Thermodynamic Studies on the Extraction of 5âHydroxymethylfurfural from Ionic Liquids
Activity coefficients at infinite dilution, Îł<sub><i>i</i></sub><sup>â</sup>, of 13 solutes such as alkanes, alkenes, alkylbenzenes, alcohols,
esters, and ethers in six 1,3-dialkylimidazolium- or tetraalkylphosphonium-based
ionic liquids have been determined by gas chromatography using the
ionic liquids as the stationary phase. Furthermore, the solubility
of 5-hydroxymethylfurfural (HMF) in these solutes and the solubility
of the solutes in 1-butyl-3-methylimidazolium methanesulfonate ([C<sub>4</sub>mim]Â[CH<sub>3</sub>SO<sub>3</sub>]) was assessed. The combination
of these data allowed for the interpretation of prevailing interactions
on molecular level and resulted in the hypothesis that an ideal extracting
agent must feature hydrogen bond acceptor properties to obtain high
extraction efficiencies of hydrogen bond donor molecules such as HMF
from this ionic liquid. Extraction data obtained using the thus proposed
extracting agents demonstrated that this hypothesis was correct and
can in future be transposed to other separation problems. In the case
of a multifunctional molecule such as HMF, extraction efficiencies
are however in general low and can only be little improved by removing
other potential interaction sites from the ionic liquidâs cation:
hence, in the <i>N</i>-ethyl-<i>N</i>-methylpyrrolidinium
analogue [C<sub>2</sub>C<sub>1</sub>pyr]Â[CH<sub>3</sub>SO<sub>3</sub>], ÏâÏ-interactions between cation and HMF cannot
form, which increases the extraction efficiency somewhat