In addition, benzene is used as an extracting agent
, solvent, laboratory chemical, and additive in gasoline.
The dry extract was prepared with 59% ethanol as extracting agent
(V/V) (with a final drug/extract ratio of 4.
The mixture of shale oil and solvent in the required proportions was put into a container, heated up to the required temperature and stirred to ensure good contact between shale oil and extracting agent.
Effect of temperature (50, 60, 70, 80[degrees]C) on the yield of raffinate at a mass ratio of extracting agent to oil of 3:1 and residence time of 30 min using technical furfural as the extracting solvent was investigated and the results are shown in Fig.
Effect of residence time on removal rate of basic nitrogen at agent to oil ratio 3:1, reaction temperature 60[degrees]C with furfural as extracting agent was also investigated and the results are shown in Fig.
The dynamics of the process depends on the extracting agent used (Fig.
Total extraction yields varied in the range 27-31% (of air-dry algal biomass) depending on the extracting agent.
Ossett, UK, has demonstrated the efficacy of a CFC-substitute (1,2,2,2-tetrafluoroethane) for use as a low-temperature and pressure extracting agent
for a variety of natural products and nutraceuticals.
In the project, the solvent extraction of elements of 4f-series (light (Ce), medium (Eu) and heavy (Lu)) with two types of extracting agents
will be investigated: the acidic chelating derivatives of pyrazolone and isoxazolone families and a neutral bifunctional organophosphorous extractant, octyl(phenyl)N,N-diisobutylcarbamoylmethyl)phosphine oxide, as well as their combinations in order to study the extraction efficiency, synergistic enhancement and selectivity using different ILs.
The levels of neutral solvent extractives are discussed, but the results obtained with alkaline extracting agents suggest that, when the woods or cork are mixed with a cement suspension, cations are adsorbed onto the substrate surfaces, and are therefore, subtracted from the solution.
Therefore, in order to assess the amount of extractives that are removed when the woods or cork are added to a cement suspension, three additional extracting agents were prepared.