Ketones, extraction

Cabezon et al. [662] simultaneously separated copper, cadmium, and cobalt from seawater by coflotation with octadecylamine and ferric hydroxide as collectors prior to analysis of these elements by flame atomic absorption spectrometry. The substrates were dissolved in an acidified mixture of ethanol, water, and methyl isobutyl ketone to increase the sensitivity of the determination of these elements by flame atomic absorption spectrophotometry. The results were compared with those of the usual ammonium pyrrolidine dithiocarbamate/methyl isobutyl ketone extraction method. While the mean recoveries were lower, they were nevertheless considered satisfactory. 

Cadmium, copper, and silver have been determined by an ammonium pyrrolidine dithiocarbamate chelation, followed by a methyl isobutyl ketone extraction of the metal chelate from the aqueous phase [677], and finally followed by graphite furnace atomic absorption spectrometry. The detection limits of this technique for 1% absorption were 0.03 pmol/1 (copper), 2 nmol/1 (cadmium), and 2 nmol/1 (silver). 

After Baishya et al. isobutyl methyl ketone extracts "Tc from the decay products of " Mo-labelled molybdate in the pH range 0.5-13.0. The use of complexing agents is unnecessary. 

Pa-233 is extracted into diisopropyl ketone. The solvent extract containing Pa-233 is washed with 6M HCl for the removal of trace manganese salts and impurities. From the diisopropyl ketone extract, protactinium-233 is reextracted into an HCl-HF mixture solution containing 6M HCl and 0. IM HF. 

Solvent extraction by tributyl phosphate (TBP) (13, 96), dithizone (20, 71, 72), cupferron (89), thenoyl trifluoroacetone (TTA) (55), diiso-propyl ketone (26), mesityl oxide (92), tri-n-benzylamine and methyl di-n-octylamine (99), diisopropyl and diisobutyl carbinol (100) have all found some application on the trace scale. Acetylaeetone and methyl isobutyl ketone extract milligram amounts of polonium almost quantitatively from hydrochloric acid, but the stable polonium-organic compounds which are formed make it difficult to recover the polonium in a useful form from solutions in these ketones (7). Ion exchange (22, 115, 119) and paper chromatography (44, 87) have also been used for trace scale separations of polonium, but the effects of the intense alpha-radiation on organic com-... 

The use of TBP in place of ketone extractants has also been reported 323 this reagent offers the advantages of higher separation factors and lower losses of extractant to the aqueous phase.324 325... 

Fungicides, Bayor2, Bayleton2, Baystan3, Cultar2, Impact Lilufol Chloroform dimethyl ketone Extracted from water with chloroform then TLC Bromocresol blue spray 0.1- [58] 0.5 mg L-1... 

Deoximatiou. Oximes arc converted into aldehydes and ketones in yields of 70-95% when treated with TTN in methanol ai room temperature. The reaction is complete within a few minutes. The precipitated thallium(I) nitrate is removed, the filtrate shaken with dilute sulfuric acid, and the aldehyde or ketone extracted with ether or chloroform. The process is formulated as shown. One limitation is that the method... 

Ammonium Pyrrolidinecarbodithioate-Methyl Isobutyl Ketone Extraction System for Some Trace Metals in Seawater... 

The gallic acid was extracted from the hydrolysis liquor with three successive 1500 mL. portions of methyl isobutyl ketone. After separating the ketone extract from the reaction mixture by decantation, it was steam distilled and the hot residual extract was then treated with iron-free activated carbon and allowed to cool. The crude gallic acid which crystallized from the solution was filtered off and dried. Yield 54 g. 

G. Fronza, C. Fuganti, G. Pedrocchi-Fantoni, S. Serra, G. Zucchi (1999) Stable isotope characterization of raspberry ketone extracted from Taxus baccata and obtained by oxidation of the accompanying alcohol (betuligenol). J. Agric. Food Chem. 47, 1150-1155... 

Comments First pilot-plant batch. Extractive work up with NH3 and methyl isobutyl ketone Extractive work up with NH3 and methyl isobutyl ketone Equilibration implemented. Extractive work up with NH3 and methyl isobutyl ketone Ratio (relative amounts) between H20/DET/Ti = approx. 0.5 2 1 measured by assay/volume of the solution that goes into the salt forming step... 

In the high temperature Synthol process as currently operated, about 5% of the reacted carbon ends up as light alcohols and ketones. Extraction of these compounds from the reaction water and their subsequent refining is an expensive process but nevertheless well worthwhile.. The ketones (mainly acetone and MEK) fetch high prices. Those alcohols which are not sold as such are added to the gasoline pool to boost its octane value and so lower the lead requirements. 

Determination of Free Rubber. The residue from the methyl ethyl ketone extraction was dried and weighed it was then placed in contact with excess n-heptane at room temperature for 24 hrs. The insoluble fraction was separated by filtration after being washed and dried, it was weighed. The supernatant was evaporated in a calibrated flask, and a thin film of n-heptane-extracted rubber remained. From the data, the amount of grafted, crosslinked polymer was calculated, and its composition was determined. 

The pentoxide (or a mixture of pentoxides) is dissolved in strong hydrofluoric acid and the resulting solution adjusted, by addition of H3SO4, to a concentration of 100 g. of pentoxide/liter, 5.6 N HF and 9N H3SO4. This solution is extracted twice with half Its volume of MIBK. The combined ketone extracts contain virtually all of the Nb and Ta originally present and are free of other metals. The organic phase is then extracted with aqueous acid as follows. 

Extraction procedures Low grade oil sand and dried oil sand slime were initially extracted with methylene chloride in a Soxhlet apparatus until the eluate from the thimble became colorless. The residue from the thimble was then dried, and stirred with acid/ methyl ethyl ketone extractant at room temperature. The resulting suspension was filtered, and the clear filtrate evaporated down and dried at room temperature over phosphorous pentoxide in a desiccator. The dried residue was then used for IR and NMR analysis. 

S)-4-Ethyl-e caprolactone using an enzymatic Baeyer-Villiger oxidation. The general procedure described above was also used to oxidize 4-ethylcyclohexanone (10 mmoles, 1.41 mL). In this case, an equimolar quantity of P-cyclodextrin (10 mmoles, 11.33 g) was included in the YP-Gal medium to solubilize the hydrophobic ketone. Extractive workup afforded 1.76 g of crude lactone as an orange oil. 

H. Goto. Y. Kakita, and T. Furukawa "Studies on Methyl Isobutyl Ketone Extraction and Determination of Metallic Salta. 1. Extraction of Iron. Antimony. Tin. Arsenic, Selenium, Tellurium, and Germanium from Hydrochloric Acid Solutions" Nippon Kagaku Zasshi 79. 1513-20 (1958) ... 

Figure 9.2 The effect of processing time on the extent of binding of polystyrene to polyethylene during processing in a closed mixer under N2 at 170°C. (1) PE/PS (1 1)+ 1 g/lOOg CHP, after methyl ethyl ketone extraction (2) PE/PS (1 1) +1 g/lOOg CHP, before extraction (3) PE/PVC (1 1) + 0.1 g/lOOg CHP, after extraction. From M. Hajian et al., Eur. Polym. J. (1984) 20, p.135-138...

Note-. Light gas + LPG reformed to hydrogen and cracked to ethylene. a-Olefins separated for use in polyethylene or detergents. Alcohols and ketones extracted. 

A nitrilase enzyme (BD9570,0.1 unit/mg, Diversa) was used to desymmetrize prochiral substrate 14 to afford (R)-15. In this process, an aqueous solution of 100 mM NaH PO at pH 7.5 (510 mL) was added to lyophilized nitrilase enzyme powder (15.15 g). The mixture was stirred at 27°C (to rehydrate the lyophilized enzyme powder) for 40 min. 3-Hydroxyglutaronitrile (252.5 g) was then charged over 10 min. The mixture was stirred at 27°C for 16 h and then cooled to 2°C prior to acidification to give pH 2. Celite was charged (25 g) and the slurry filtered. The filtrate was extracted with methyl ethyl ketone. The combined methyl ethyl ketone extracts were evaporated in vacuo (15 mbar, 40°C) to yield the product 15 as a brown liquid (240.8 g, 81% yield ee 98.8%). 

Poly(vinyl methyl ketone) Extraction Acetone Soluble and insoluble 3249... 

Allen253 has tested dllsobutyl ketone, dllsopropyl ketone, and methylhexyl ketone as solvents for the purification of uranium from Iron, copper, chromium, and nickel. Dllsobutyl ketone was found most satisfactory under the conditions tested.. Dllsopropyl extracted some Iron and chromium. Methylhexyl ketone extracted Iron, chromium, and copper. 

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