Showing papers on "Methyl isobutyl ketone published in 1971"
TL;DR: The enthalpy of mixing of dimethylsulfoxide and water has a minimum of −662 cal mol−1 at 0.35 moles fraction, and the enthalpies of mixing with the ketones are nearly symmetric in mole fraction as discussed by the authors.
74 citations
TL;DR: The rate of beryllium ion extraction from aqueous 4.0M or 0.1M sodium perchlorate-chloride or -nitrate ionic media into carbon tetrachloride or MIBK as a chelate complex with TTA (thenoyltrifluoroacetone) has been determined at 25°C as mentioned in this paper.
Abstract: The rate of extraction of beryllium ions from aqueous 4.0M or 0.1M sodium perchlorate-chloride or -nitrate ionic media into carbon tetrachloride or MIBK (methyl isobutyl keton) as a chelate complex with TTA (thenoyltrifluoroacetone) has been determined at 25°C. The rate of extraction in the carbon tetrachloride system is first-order with respect both to the beryllium ion and the dissociated TTA anion in the aqueous phase. The rate constant for this reaction is about 2×104M2min−1. The rates in these systems are not influenced by the replacement of perchlorate ions by nitrate or chloride ions in the ionic media when the ionic concentration is kept constant. On the other hand, it was found that three extraction reactions take place in the MIBK systems. The rate of these extractions is in all cases first-order with respect both to the beryllium ion and the dissociated TTA anion, but is zeroth-, first, or second-order with respect to the perchlorate ions in the aqueous phase. Because of this, the extraction is...
16 citations
TL;DR: In this paper, a method for the determination of silver in soil, sediment, and rock samples in geochemical exploration has been developed, where the sample is digested with concentrated nitric acid, and the silver extracted with triisooctyl thiophosphate (TOTP) in methyl isobutyl ketone (MIBK) after dilution of the acid digest.
16 citations
Patent•
03 Feb 1971
TL;DR: In this paper, pressure sensitive copying sheets are produced by coating paper or similar sheet material with an aqueous suspension of a microencapsulated oily printing ink emulsion, particularly colourless lenco dye intermediates, which has been prepared by mixing the oil, an emulsifying agent, water and (1) a solution of a hydrophobic thermoplastic resin in an oil-and water-miscible solvent from which the resin precipitates on dilution with water or (2) an a queous solution of partially condensed thermosetting resin, so that
Abstract: 1,221,489. Pressure-sensitive copying sheets. CHAMPION PAPER CO. Ltd. 5 Aug., 1968, No. 37260/68. Heading D2B. [Also in Division B8] Transfer sheet materials are produced by coating paper or similar sheet material with an aqueous suspension of a microencapsulated oily printing ink emulsion, particularly colourless lenco dye intermediates, which has been prepared by mixing the oil, an emulsifying agent, water and (1) a solution of a hydrophobic thermoplastic resin in an oil- and watermiscible solvent from which the resin precipitates on dilution with water or (2) an aqueous solution of a partially condensed thermosetting resin from which the resin precipitates on dilution, so that resin separates in solid form about a nucleus of oil-in-water emulsion. Suitable resins are (1) polyvinyl chloride, polystyrene, polyvinylacetate, vinyl chloride - vinylidene chloride copolymers, cellulose acetate, ethyl cellulose or novolak resin dissolved in tetrahydrofuran, dioxane, cyclohexanone, methyl tetrahydrofuran, methyl isobutyl ketone or acetone or (2) are formaldehyde condensates of phenols, carboamides, triazines, amines and amides, ketones, aromatic hydrocarbons or heterocyclics, particularly melamine, phenol or urea. Where both types of resin are used they may be added in either order to produce two encapsulating walls. The emulsifier is gum arabic or tragacanth, azo, gelatin, starch, methyl cellulose, polyvinyl pyrrolidone or methyl vinyl ether-maleic anhydride copolymer. Stabilisers may also be incorporated; dibasic lead phosphite or stearate, tribasic lead sulphate monohydrate, or dibutyl tin maleate in the case of the thermoplastic resin and zinc stearate or dibasic lead stearate for the thermosetting resin. The inks to be encapsulated are dissolved in oils, e.g. cottonseed, castor, soybean, petrolium lubricating, fish liver, drying or essential oils, methyl salicylate, halogenated biphenyls or low melting fats or waxes, e.g. lard, sperm oil or lanolin; an inhibitor, e.g. N- pihenyl 2-naphthylamine may be included, and a buffer material is preferably added to maintain the aqueous phase alkaline. Dispersions of the microencapsulated colourless inks in water with a binder material are applied to one side of paper to form a transfer sheet. The copy sheet is an adsorbent, acidic electron-acceptor material so that when dye from the transfer sheet is applied by rupture of the capsules by pressure, the dye is converted to a visible form.
12 citations
TL;DR: Biological samples containing Cr(III) were wet-ashed and oxidized to Cr(VI) with a mixture of nitric, sulfuric, and perchloric acids and the oxidized chromium was extracted into 10% tributyl phosphate in methyl isobutyl ketone.
12 citations
TL;DR: Extraction properties of chelates of Ni 2+, Cu 2+, Co 3+, Fe 2+ and Zn 2+ with pyridine-2-aldehyde-2 quinolylaldehyde (PAQH) were studied by means of transmission and atomic absorption spectroscopy as discussed by the authors.
11 citations
TL;DR: In this article, a standard addition method was described for the determination of vanadium in brines by atomic absorption spectroscopy with a nitrous oxide-acetylene flame, where the sample pH was adjusted to 1.0 with concentrated hydrochloric acid and the vanadium was directly extracted with 5% cupferron in methyl isobutyl ketone (MIBK).
11 citations
11 citations
TL;DR: In this article, the formation and extraction equilibria of zinc(II) complexes with thiocyanate ions have been determined at 25°C, and the stability constants of these complexes in the aqueous phase were first determined from the decrease in β-isopropyltropolone (IPT) chelate extraction.
Abstract: The formation and extraction equilibria of zinc(II) complexes with thiocyanate ions have been determined at 25°C. Zinc(II) ions in 1 m sodium perchlorate constant ionic media containing thiocyanate ions at various concentrations have been extracted into chloroform containing β-isopropyltropolone (IPT), into hexane containing trioctylphosphine oxide (TOPO), or into methyl isobutyl ketone (MIBK). The stability constants of the zinc(II) thiocyanate complexes in the aqueous phase were first determined from the decrease in the IPT chelate extraction, and then the distribution constants for the zinc(II) thiocyanate complexes into the latter two solvents were determined. The results were explained by saying that (i) zinc(II) forms the first (logβ1=0.56), second (logβ2=1.32), and the third (logβ3=1.18) complexes in the above aqueous phase, (ii) TOPO in hexane extracts the second complex as an adduct in the Zn(SCN)2(TOPO)2 form, (iii) MIBK extracts both the second and the third complexes, and (iv) the addition of ...
10 citations
Patent•
06 Jan 1971
TL;DR: In this paper, a pressure sensitive transfer element was made by printing inks of composition as followed: (a) vinyl chloride/ vinyl acetate copolymer, methyl ethyl ketone, methyl isobutyl ketones, toluene, blue pigment, titanium dioxide and tricresyl phosphate.
Abstract: 1,218,031. Ink compositions. COLUMBIA RIBBON & CARBON MFG. CO. Ltd. 28 Oct., 1968 [4 Aug., 1967], No. 35902/67. Heading C3P. [Also in Division D2] In making a pressure-sensitive transfer element (see Division D2), printing inks of composition as followed are used: (a) vinyl chloride/ vinyl acetate copolymer, methyl ethyl ketone, methyl isobutyl ketone, toluene, blue pigment, titanium dioxide and tricresyl phosphate; (b) polyvinyl butyral, isopropyl alcohol, isopropyl acetate, blue pigment, titanium dioxide and tricresyl phosphate. Solutions of vinyl chloride/ vinyl acetate copolymer in methyl ethyl ketone, and polyvinyl butyral in isopropyl alcohol are used to form coatings of the two polymers. A composition containing a ground pigment paste (black toner pigment with lecithin), vinyl chloride/vinyl acetate copolymer, methyl ethyl ketone and toluene is coated on to a substrate, and the solvent evaporated to form an inkfilled, microporous transfer layer.
5 citations
TL;DR: In this paper, the number of double bonds available for reaction in poly-trans-1,4-butadiene was determined by epoxidation in suspension; crystal thicknesses were measured by electron microscopy.
Abstract: Crystals of poly-trans-1,4-butadiene of uniform size have been grown from three solvents (n-heptane, methyl isobutyl ketone, and toluene) by using a minimum dissolution temeprature technique. The percentage of double bonds available for reaction in the crystals was determined by epoxidation in suspension; crystal thicknesses were measured by electron microscopy. These values were used to calculate the number of monomer units per fold. The number of available double bonds was found to increase with decreasing molecular weight, evidence for the presence of non-reentrant chains (cilia) at the crystal surfaces. The nature of the chain fold in poly-trans-1,4-butadiene crystals is discussed.
Patent•
29 Dec 1971
TL;DR: In this article, an improved process for the mixing of 2, 6-DIALKYL PHENOLS was proposed, which is similar to the one described in this paper.
Abstract: AN IMPROVED PROCESS FOR THE OXIDATION OF 2, 6-DIALKYLPHENOLS WHICH COMPRISES THE MIXING OF THE DIALKYL PHENOL IN THE PRESENCE OF AN OXYGEN CONTAINING GAS AND A CATALYST SELECTED FROM A COMBINATION OF A NOBLE METAL SALT AND CUPRIC OR FERRIC NITRATE IN A PARTICULAR SOLVENT AND HEATING THE MIXTURE TO YIELD 2, 6-DIALKYLQUINONE, DIPHENOQUINONE, AND AN OXIDIZED POLYPHENOXYETHER. THE NOBLE METAL SALTS WHICH WERE FOUND TO BE EFFECTIVE ARE PALLADIUM CHLORIDE, PALLADIUM ACETATE, RUTHENIUM CHLORIDE, RHODIUM CHLORIDE, AND THE SOLVENTS WHICH WERE FOUND TO BE EFFECTIVE ARE: TERTIARY HEXYL ALCOHOL, TERTIARY AMYL ALCOHOL AND METHYL ISOBUTYL KETONE.
TL;DR: In this paper, a neutron activation method is described for the analysis of small concentrations of Cu, Cd, Mn, Co, Cr and Zn contaminants in thorium and zirconium compounds used for telecommunication and reactor techniques.
Abstract: A neutron activation method is described for the analysis of small concentrations of Cu, Cd, Mn, Co, Cr and Zn contaminants in thorium and zirconium compounds used for telecommunication and reactor techniques. The thorium matrix is separated from the contaminants by pre-irradiation paper chromatography and the233Pa is isolated after irradiation by extraction into methyl isobutyl ketone and precipitation with cupferron. For the analysis of the contaminant in zirconium compounds only precipitation with cupferron is used after irradiation. The individual impurities are determined by γ-spectrometry following separation.
Patent•
30 Jun 1971
TL;DR: A rear projection screen comprises a transparent base coated on one face with a mixture of finely divided 2 to 6 micron particles of amorphous silica having capillary passages therein in a transparent organic material, silica being in the proportion of 1%-5% by weight.
Abstract: 1,237,201. Coated products. GAF CORP. 17 Jan., 1969 [19 Jan., 1968], No. 2910/69. Heading B2E. [Also in Divisions G2 and G3] A rear projection screen comprises a transparent base coated on one face with a mixture of finely divided 2 to 6 micron particles of amorphous silica having capillary passages therein in a transparent organic material, silica being in the proportion of 1%-5% by weight. The transparent organic material may be a nitrocellulose lacquer, or a composition of 15% vinyl resin, 3% cyclohexanone, 61% di-isobutyl ketone, 10% xylol, 10% methyl isobutyl ketone, and 1% plasticizer such as di-butyl-phthalate. The silica is initially prepared as a concentrated mixture which is subsequently diluted with more lacquer for spraying on to the base. The base may be of polymethyl methacrylate, glass or polystyrene in which latter case the lacquer is a vinyl or acrylic emulsion.
Patent•
06 Oct 1971TL;DR: In this article, a C 3 -C 13 ketone and a diester are used for a phthalate diester with 6 to 18 carbon atoms in each ester group (e.g. diisodecylphthalate).
Abstract: 1,249,133. Lubricants. EASTMAN KODAK CO. 27 Sept., 1968 [29 Sept., 1967], No. 45957/68. Heading C5F. [Also in Division F2] A lubricant comprises a C 3 -C 13 ketone and a diester. The lubricant is preferably a phthalate diester having 6 to 18 carbon atoms in each ester group (e.g. diisodecylphthalate) and the ketone may be acetone, methyl ethyl ketone or methyl isobutyl ketone. Other lubricants which may be used are dioctyl phthalate, didodecyl phthalate, dihexadecyl phthalate, octyldecylphthalate.
28 Feb 1971
TL;DR: In this paper, it was found that sodium diethyldithiocarbamate (DDTC) was better than ammonium pyrrolidyldithionic acid (APDC) for the atomic absorption spectroscopic determination of cadmium.
Abstract: In the atomic absorption spectroscopic determination of cadmium, ammonium pyrrolidyldithiocarbamate (APDC) was used as the chelating reagent but it was found that sodium diethyldithiocarbamate (DDTC) was better than APDC. Cadmium pyrrolidyldithiocarbamate was slightly soluble in most organic solvents and fairly soluble only in methyl isobutyl ketone, but cadmium diethyldithiocarbamate was easily soluble in most organic solvents. Therefore, extraction efficiency of cadmium complex from the aqueous solution with methyl isobutyl ketone was very good in the case of cadmium diethyldithiocarbamate. This experimental fact resulted in the simplified procedure and high recovery ratio.
31 Aug 1971
TL;DR: In this article, a trace amount of cadmium of ppb level was determined by aspirating the methyl isobutyl ketone extract using ammonium pyrrolidine dithiocarbamate as a chelating agent.
Abstract: A trace amount of cadmium of ppb level was determined by aspirating the methyl isobutyl ketone extract using ammonium pyrrolidine dithiocarbamate as a chelating agent. When a large aqueous phase/solvent ratio was used, the volume of the organic phase obtained after extraction decreased to a smaller volume compared with the initial volume added because of the appreciable solubility of methyl isobutyl ketone in water. In addition to the solvent effect, this "solubility effect"resulted in much enhanced sensitivity for the determination of cadmium.
TL;DR: In this article, Europium is extracted from an aqueous phase 1 M (H, Na)ClO 4 by H 2 B 2 EDP into benzene, CHCl 3, CHBr 3, methyl isobutyl ketone and into benzenes containing 12% pentanol-1.