Showing papers on "Methyl isobutyl ketone published in 1989"

Atomic Absorption Spectrometric and Spectrophotometric Trace Analysis of Uranium in Environmental Samples with N-p-MEthoxyphenyl-2-Furylacrylohydroxamic acid and 4-(2-Pyridylazo) Resorcinol

Abstract: Methods are presented for the determination of uranium in presence of various anions and cations which are usually associated with it in rocks, waters, minerals, nuclear fission products and biological materials. The methods are based on the solvent extraction of uranium(VI) as its complex with N-p-methoxyphenyl-2-furylacrylohydroxamic acid (MFHA) in chloroform, or methyl isobutyl ketone (MIBK) at pH 4.5–5.1. The uranium in the orange-yellow chloroform extract is either directly determined spectrophotometrically or back-extracted into 0.01 M HCl solution and determined as its intensely red coloured complex (e = 3.94 × 104 mol−1 cm−1 at 530 nm) with 4-(2-Pyridylazo) resorcinol (PAR). The metal in the MIBK extract is determined atomic absorption spectrometrically by the aspiration of the extract in nitrous oxide-acetylene flame and measuring the absorbance at 358.5 nm resonance line. Both the methods are highly sensitive and selective, and were applied to the determination of uranium in waters, pla...

An electrically driven multistage countercurrent solvent extraction device: the emulsion-phase contactor

Abstract: An electrically-driven, high-surface-area solvent extraction system has been conceived and tested. The system accomplishes droplet formation, coalescence, and phase separation utilizing a single electric field while operating under countercurrent flow conditions. The mass-transport capability of this system has been analyzed by observing the transfer of acetic acid from water (dispersed phase) into methyl isobutyl ketone. Results are reported in terms of the number of theoretical transfer stages per centimeter of column. The emulsion-phase contactor, which has 1.7 stages/cm, outperforms laboratory-scale versions of the York-Scheibel column by a factor of 17 and the Podbielniak centrifugal contactor by a factor of 10. The mass-transfer performance along with the minimal energy requirements of this conceptual device combine to make it an attractive possibility for greatly enhanced solvent extraction operations.

Liquid―liquid extraction of ethanol from aqueous solutions with amyl acetate, benzyl alcohol, and methyl isobutyl ketone at 298-15 K

Abstract: Experimental mutual solubility and tie-line data were determined for three ternary liquid-liquid systems containing water, ethanol, and amyl acetate, benzyl alcohol, and methyl isobutyl ketone at 298.15{Kappa} in order to obtain their complete phase diagrams and to determine which is the most suitable solvent for extraction of ethanol from aqueous solutions. Tie lines were determined correlating the density of the binodal curve as a function of composition and the plait points using the Othmer and Tobias method. The experimental data were also correlated with the UNIFAC group contribution method. A qualitative agreement was obtained. Experimental results show that amyl acetate is a better solvent than methyl isobutyl ketone and benzyl alcohol.

Heat reversible recording material

Abstract: PURPOSE: To obtain a heat reversible recording material having a wide temperature range capable of being brought to a transparent state and a large contrast by incorporating a matrix material composed of a styrene-butadiene copolymer and saturated carboxylic acid. CONSTITUTION: Carpric acid, lauric acid, myristic acid, etc., are proper as saturated carboxylic acid, and corresponds to 10-24C saturated carboxylic acid, and it is preferable that saturated carboxylic acid is kept within a range of (1:1)-(20:1) at a mixing ratio with a matrix material. When the coating fluid of a heat reversible recording material is adjusted for being applied to a substrate, etc., on usage, the matrix material and saturated carboxylic acid are dissolved into a solvent and the coating fluid may be acquired, and one kind selected from tetrahydrofuran, methyl ethyl ketone, methyl isobutyl ketone, etc., may be used or two kinds or more are mixed and may be employed as the solvent. Accordingly, the heat reversible recording material, a temperature range of which capable of being brought to a transparent state can be enlarged and a contrast of which can also be improved, is obtained. COPYRIGHT: (C)1991,JPO&Japio

Influence of solvent quality on surface forces between polystyrene layers adsorbed onto mica

Abstract: (about 40 nm) and small size (about 10 nm). The particle size in o-xylene was about 20 nm, while that in p-xylene was about 75 nm. In valeric acid, dimethyl sulfoxide, and caproic acid, relatively larger palladium particles were obtained in the range 60-100 nm. Thus, the fact that relatively larger particles are prepared in organic solvents whose boiling points are much higher than that of methyl isobutyl ketone indicates the nucleation of palladium seems not to proceed rapidly, but the nuclear growth occurs in an organic solvent with a higher boiling point, resulting in a larger particle size of palladium. Since very stable palladium particles were obtained in methyl isobutyl ketone, the effect of concentration of P d ( a ~ a c ) ~ on the particle size of palladium was studied in methyl isobutyl ketone where the concentration of Pd(acac)2 was between 0.1 and 1.0 mmol dn~-~ . Figure 2 shows that the average diameter of palladium is nearly independent of the concentration of P d ( a ~ a c ) ~ and ranges between 8 and 10 nm. The effect of refluxing time on the particle size of palladium was also studied. Figure 3a shows that the average diameter of palladium is almost constant in all the refluxing times studied. Further, Figure 3b shows that the absorbance of palladium particles in methyl isobutyl ketone increases with an increase of the refluxing time, suggesting that the number of palladium particles increases since the particle diameter is almost constant over a whole refluxing time. It is concluded from the above results that the thermal decomposition of P d ( a ~ a c ) ~ in methyl isobutyl ketone gives relatively monodispersed palladium particles whose stability is considerably high. The particle diameter ranges between 8 and 10 nm. Further, it is also expected that many organo precious metal particles can be prepared in organic solvents from decomposition of their corresponding organic complexes.

A rapid method for the determination of trace Cu and Fe in edible salad oil by graphite furnace atomic absorption spectroscopy

Abstract: In the determination of trace amounts of copper and iron in edible salad oils by graphite furnace atomic absorption spectroscopy (GFAAS), an ashing method with low temperature oxygen plasma was used to effectively eliminate the interference of the organic matrix. Two sample preparation methods were studied, extraction with concentrated nitric acid followed by ashing with the low temperature oxygen plasma to determine the yield of extraction, and direct analysis of the metal content after dilution with methyl isobutyl ketone (MIBK). Results obtained from these methods were compared with the background absorbance by inductively coupled plasma-atomic emission spectroscopy (ICP-AES).

A New Catalyst for Mibk Synthesis—Palladium on Zsm-5 Zeolites

Abstract: The one-step vapour phase synthesis of methyl isobutyl ketone (MIBK) was extensively studied on supported bifunctional Pd catalysts Effects of support acidity and Pd metal dispersion on both acetone conversion and MIBK selectivity were examined It was found that ZSM-5 modified by exchange with alkali metal cation, especially Cs ions, would enhance the selectivity of MIBK The results indicated that MIBK selectivity as high as 82% with the conversion of acetone about 42% at 250°C could be obtained

Production of solvent-soluble polyorganosilsesquioxane

Abstract: PURPOSE: To mass-produce the subject compound having a ladder form of a regular structure by subjecting an organotriacetoxysilane as a starting material to a specified reaction. CONSTITUTION: The subject compound of the formula [wherein R is a 1-5C alkyl, an alkenyl, a halogen-substituted alkyl or a (substituted) 6-10C hydrocarbon group; R' is H, an organic group or an organo(polysiloxy)silyl; and (n) is 2-10000] is obtained by reacting an organotriacetoxysilane (e.g. methyl- triacetoxysilane) with an equivalent amount of an alcohol (e.g. ethyl alcohol) and/or water in an organic solvent (e.g. methyl isobutyl ketone) to form an alkoxyacetoxysilane, polycondensing this product in the presence of sodium hydrogencarbonate in an organic solvent to form a prepolymer, and polycondensing this prepolymer by heating in the presence of at least one catalyst selected form the group consisting of an alkali (alkaline earth) metal hydroxide, an alkali (alkaline earth) metal fluoride and triethylamine (e.g. KOH). COPYRIGHT: (C)1991,JPO&Japio

Process for recovering gallium

Abstract: In the process for recovering gallium from aqueous, alkaline solutions by adsorption of the gallium on to bead-polymerised synthetic resins impregnated with 8-hydroxyquinolines and elution thereof with aqueous acids, the synthetic resins employed according to the invention are macroporous polydivinylbenzene or macro-porous divinylbenzene copolymers which have been obtained by bead polymerisation of divinylbenzene or mixtures of aromatic mono-, di- and/or trivinylbenzenes containing at least 50% by weight of divinylbenzene, in the presence of methyl isobutyl ketone, and which have been loaded with 160-190 g of Kelex 100 per litre of resin; in addition the resin is washed with sodium hydroxide solution after the elution step and before the commencement of each individual service cycle.

Atomic Absorption Spectrometric Microdetermination of Tungsten (VI) in Alloys and Environmental Samples After Extractive Separation with a Hydroxamic Acid into Mibk

Abstract: Tungsten (VI) was selectively extracted from 2–8 M HCI or 15–20 M H2SO4 media with N-p-methoxyphenyl-2-furylacrylohydroxamic acid (MFHA) in methyl isobutyl ketone (MIBK) and determined atomic absorption spectrometrically at 400.9 nm employing nitrous oxide-acetylene flame. The method was significantly more selective and sensitive than the prevailing methods for tungsten (VI) based on flame-AAS, and was successfully applied to the trace analysis of the metal in alloys, ores, plant tissues, animal tissues, and freshwaters. MFHA was chosen from amongst eleven new hydroxamic acids.

Production of carnitine

Abstract: PURPOSE:To obtain the subject compound useful as a remedy, etc, for cardiopathy in high yield and optical purity by reacting a gamma-halo-beta- hydroxybutyric acid ester with trimethylamine in a ketone solvent and hydrolyzing the resultant product CONSTITUTION:For example, a gamma-halo-beta-hydroxybutyric acid ester expressed by formula I (X is halogen; R is hydrocarbon) is reacted with trimethylamine in the presence of a ketone solvent, such as acetone, methyl ethyl ketone or methyl isobutyl ketone, to afford a carnitine ester expressed by formula II, which is then advantageously hydrolyzed with an alkali, such as NaOH or KOH, as a catalyst to provide carnitine expressed by formula III

Ionic Association of Mixed Nickel(II) Chelates in Alcohols, Ketones, and Nitrobenzene

Abstract: The conductances of mixed nickel(II) chelates, [Ni(acac)(N,N,N′,N′-tmen)]X (where acac=2,4-pentanedionato, N,N,N′,N′-tmen=N,N,N′,N′-tetramethylethylenediamine, and X−=ClO4− or NO3−), in alcohols {ethanol (EtOH), 1-propanol (n-PrOH), 2-propanol (i-PrOH), and 1-butanol (n-BuOH)}, ketones {acetone (Me2CO), methyl ethyl ketone (MEK), and methyl isobutyl ketone (MIBK)}, and nitrobenzene (PhNO2) were measured at 25 °C. The obtained ionic association constants (Ka) of [Ni(acac)(N,N,N′,N′-tmen)]ClO4 which were derived by using the extended Fouss–Hsia function indicated that (1) the perchlorate complex is a normal type of uni-uni-valent electrolyte and (2) it is more dissociated than [Co(acac)2(N,N,N′,N′-tmen)]ClO4 in EtOH, n-PrOH, and n-BuOH. Walden products of the cations suggest that the nickel(II) chelate cation in the alcohols is present as an octahedral form with the coordination of two solvent molecules. On the other hand, Ka of [Ni(acac)(N,N,N′,N′-tmen)]NO3 are much larger than those of [Ni(acac)(N,N,N′,N′...

Simultaneous Extraction and Atomic Absorption Spectrometric Determination of IB Group Elements (Cu, Ag, Au) from Aqueous Thiocyanate/2,2′-Dipyridyl-2-Pyridylhydrazone (Dpph) Solutions

Abstract: A quantitative simultaneous extraction procedure of copper, silver and gold cations from aqueous thiocyanate solutions into Methyl Isobutyl Ketone (MIBK) is described. the effects of pH, thiocyanate and 2,2′-Dipyridyl-2-py-ridylhydrazone (DPPH) concentration were studied. Tolerance amounts for many diverse cations and anions have been determined. Finally, a procedure for the determination of IB Group elements is recommended, by extaction-AAS.

Production of block copolymer and polymerization initiator

Abstract: PURPOSE:To obtain a block copolymer useful as a binder, surface-treating agent, etc., on an industrial scale at a low cost, by using a ketone peroxide having a specific structure as a radical polymerization initiator and carrying out the polymerization by a two-stage polymerization process. CONSTITUTION:The objective block copolymer is produced by using a polymerization initiator consisting of methyl isobutyl ketone peroxide containing >=70% of the organic peroxide of formula and carrying out the polymerization by two-stage polymerization process. The two-stage polymerization process preferably comprises the 1st stage polymerization of one or more monomers at a low temperature in the presence of a reducing agent acting exclusively to hydroperoxy group and inducing redox reaction (e.g., sodium bisulfite or L- ascorbic acid) and the successive 2nd stage polymerization comprising the addition of one or more monomers to the polymerization system maintained at a high temperature to induce the decomposition of the monomer.

Determination of Gallium By Liquid-Liquid Extraction-Flame Atomic Absorption Spectrometry In Bayer Process Aluminate Solutions

Abstract: The described flame-atomic absorption determination of gallium involves the extraction of 8-hydroxyauinoline-Ga complex and the extraction of galhum as an ion association complex from strong hydrochloric acid into Methyl Isobutyl Ketone (MIBK) Both of the examined extraction systems were found to be workable for gallium determination in aqueous solutions A comparison of mentioned extraction systems showed that only the second one can be applied for gallium determination in low concentration in aluminate solutions (strong alkaline) Finally, an analytical scheme for gallium determination in aluminate solutions is recommended (extraction of Ga from hydrochloric acid solutions, 30-50M, through matrix matched calibration curve) the proposed procedure was found to be simple, selective and accurate

Method for recovering gallium

Abstract: Erfindungsgemas werden im Verfahren zur Gewinnung von Gallium aus wasrigen alkalischen Losungen durch Adsorption an mit 8-Hydroxychinolinen getrankten perlpolymerisierten synthetischen Harzen und Elution mit wasrigen Sauren als synthetische Harze makroporoses Polydivinylbenzol oder makroporose Divinylbenzol-Copolymerisate verwendet, die durch Perlpolymerisation von Divinylbenzol oder mindestens 50 Gew.-% Divinylbenzol enthaltenden Gemischen aromatischer Mono-, Di- und/oder Trivinylbenzole in Gegenwart von Methylisobutylketon erhalten und mit 160-190 g Kelex 100 l/ Harz beladen wurden. According to the invention with 8-hydroxyquinolines soaked perlpolymerisierten synthetic resins and elution used with aqueous acids as synthetic resins macroporous polydivinylbenzene or macroporous divinylbenzene copolymers in the method for recovering gallium from aqueous alkaline solutions by adsorption on the weight by suspension polymerization of divinylbenzene or at least 50th - with 160-190 g Kelex l / resin were loaded condition% divinylbenzene-containing mixtures of aromatic mono-, di- and / or trivinylbenzenes in the presence of methyl isobutyl ketone to 100. Auserdem wird das Harz nach der Elution und vor Beginn eines jeden Arbeitszyklus mit Natronlauge gewaschen. In addition, the resin is washed after elution and before the beginning of each cycle with sodium hydroxide.

Estimation of organic bases in coal carbonization wastewater

Abstract: A simple, suitable, reliable and accurate chromatographic method has been developed for estimation of organic bases in coal carbonization wastewater using Methyl Isobutyl Ketone (MIBK) and Diethylether (DEE). The method gives an accuracy of 80-90 per cent while precision ranges from 1-5 per cent at different concentrations of various constituents

Green sheet for ceramic substrate and thick-film paste composition for simultaneous calcination

Abstract: PURPOSE:To obtain the titled sheet which is free from generation of a wrinkle and a crack on the surface in a drying process by using butyl methacrylate resin as an organic binder and using a mixed soln. of methyl isobutyl ketone and isophorone as a solvent. CONSTITUTION:Slurry consisting of (A) ceramic powder (e.g. alumina powder), (B) an organic binder consisting of butyl methacrylate resin, (C) a solvent consisting of a mixed soln. of methyl isobutyl ketone and isophorone, (D) a plasticizer (e.g. dibutyl phthalate) and (E) a dispersant added in accordance with necessity is prepared. Then this slurry is molded with a doctor blade method and a green sheet for a ceramic substrate is produced. Thereby the dried sheet which is free from a wrinkle and a crack on the surface and homogeneous can be produced without using a specific drying means even in the case of a thick-walled sheet.

Dust-proof membrane

Abstract: PURPOSE:To obtain a dust-proof membrane whose film thickness is uniform and having excellent light transmission, light resistance and durability, by forming a film from a specified cellulose propionate by a rotating process. CONSTITUTION:A soln. of cellulose propionate whose wt.-average MW is 60,000-400,000 (in terms of polystyrene) in an org. solvent (e.g., methyl isobutyl ketone) with a wt. ratio of 1:10-30 is filtered under pressure with a filter of about 0.2mum to remove contaminants. An org. solvent which is a poor solvent (e.g., hexane) with a vol. ratio (poor solvent/solvent) of 0.8-1.8 is added to precipitate and remove high-MW component, gel-like material and impurities of low solubility in cellulose propionate to obtain a cellulose propionate soln. Then, this soln. is fed on a horizontal plane 3 of a base plate 2 placed on a turn table 1 from a nozzle 4 and the turn table 1 is rotated with a rotating speed of 400-4,000rpm to form a film of the soln. by means of the centrifugal force and to obtain a dust-proof membrane whose thickness is 2.85mum and light transmission is 99% or higher.

Synthesis of 2-benzyl (and isobutyl)-5-hydroxybenzopurans

Abstract: Condensation of p-benzoquinones with methyl benzyl and methyl isobutyl ketone enamines has given the novel 2-benzyl (and isobutyl)-5-hydroxy-benzofurans.