Methyl isobutyl ketone MIBK

Aqueous solutions buffered to a pH of 5.2 and containing known total concentrations of Zn + are prepared. A solution containing ammonium pyrrolidinecarbodithioate (APCD) is added along with methyl isobutyl ketone (MIBK). The mixture is shaken briefly and then placed on a rotary shaker table for 30 min. At the end of the extraction period the aqueous and organic phases are separated and the concentration of zinc in the aqueous layer determined by atomic absorption. The concentration of zinc in the organic phase is determined by difference and the equilibrium constant for the extraction calculated. 

Methyl Isobutyl Ketone. Methyl isobutyl ketone (MIBK) (4-methyl-2-pentanone), (CH2)2CHCH2COCH2, is an industrially important solvent which after methyl methacrylate and bisphenol A is the third largest tonnage product obtained from acetone. 

In the initial thiocyanate-complex Hquid—Hquid extraction process (42,43), the thiocyanate complexes of hafnium and zirconium were extracted with ether from a dilute sulfuric acid solution of zirconium and hafnium to obtain hafnium. This process was modified in 1949—1950 by an Oak Ridge team and is stiH used in the United States. A solution of thiocyanic acid in methyl isobutyl ketone (MIBK) is used to extract hafnium preferentially from a concentrated zirconium—hafnium oxide chloride solution which also contains thiocyanic acid. The separated metals are recovered by precipitation as basic zirconium sulfate and hydrous hafnium oxide, respectively, and calcined to the oxide (44,45). This process is used by Teledyne Wah Chang Albany Corporation and Western Zirconium Division of Westinghouse, and was used by Carbomndum Metals Company, Reactive Metals Inc., AMAX Specialty Metals, Toyo Zirconium in Japan, and Pechiney Ugine Kuhlmann in France. 

MEK in urine METHYL ISOBUTYL KETONE (MIBK) End of shift 2 mg/l ... 

Obviously, accurate concentrations of other gases or vapors cannot be indicated unless the instrument has been appropriately calibrated for each of these gases. Furthermore, the manufacturer s calibration may not be sufficiently accurate and a correction may be required. For example, a meter reading of 2.0 on the 0 to 10% LEL scale of one instrument would indicate, for a solvent having an LEL of 1.4 %, a concentration of 280 ppm (0.02 x 14,000 ppm). Benzene, methyl isobutyl ketone (MIBK). For example, a meter reading of 2.0 on the O-to-10% LEL scale of one instrument would indicate, for a solvent having an LEL of 1.4%, a concentration of 280 ppm (0.02 x 14,000 ppm). Benzene, methyl isobutyl ketone (MIBK) and toluene all have LEL s of 1.4%, but actual concentrations at a meter... 

In this study we examine the generalities in reductive alkylation however, since the subject is vast, we limited ourselves to the interaction of aromatic and aliphatic primary amines and diamines with ketones. The ketones examined include the cyclic ketone, cyclohexanone, and aliphatic ketones such as acetone, and methyl isobutyl ketone (MIBK). We limited our study to sulfided and unsulfided Pt and Pd catalysts supported on activated carbon that were commercially available from Evonik Degussa Corporation. 

The aldol condensation of acetone to diacetone alcohol is the first step in a three-step process in the traditional method for the production of methyl isobutyl ketone (MIBK). This reaction is catalysed by aqueous NaOH in the liquid phase. (3) The second step involves the acid catalysed dehydration of diacetone alcohol (DAA) to mesityl oxide (MO) by H2S04 at 373 K. Finally the MO is hydrogenated to MIBK using Cu or Ni catalysts at 288 - 473 K and 3- 10 bar (3). 

Figure 12.8 S3fnthesis of methyl isobutyl ketone (MIBK) from acetone.

Methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK) have higher boiling temperatures, are less hazardous liquids, and are also popular... 

In 1942, the Mallinckrodt Chemical Company adapted a diethylether extraction process to purify tons of uranium for the U.S. Manhattan Project [2] later, after an explosion, the process was switched to less volatile extractants. For simultaneous large-scale recovery of the plutonium in the spent fuel elements from the production reactors at Hanford, United States, methyl isobutyl ketone (MIBK) was originally chosen as extractant/solvent in the so-called Redox solvent extraction process. In the British Windscale plant, now Sellafield, another extractant/solvent, dibutylcarbitol (DBC or Butex), was preferred for reprocessing spent nuclear reactor fuels. These early extractants have now been replaced by tributylphosphate [TBP], diluted in an aliphatic hydrocarbon or mixture of such hydrocarbons, following the discovery of Warf [9] in 1945 that TBP separates tetravalent cerium from... 

Methyl isobutyl ketone, MIBK, hexone 18. o-Phenanthroline... 

Enamel Preparation. Soluble oligoester diols (Ib-ld, 2a-2g, and 3a-3g), HMMM, methyl isobutyl ketone (MIBK) and -toluenesulfonic acid ( -TSA) were thoroughly mixed in a 70/30/30/0.3 wt. ratio. The solution was cast on panels and baked at 150" for 30 min. Less soluble LC diols le-lg were melted, dispersed in MIBK, mixed with HMMM and -TSA in the above proportions and immediately cast as films. Oligoester diol la was too insoluble for enamel formation. 

Materials. Phthalic anhydride (PA), adipic acid (AA), neopentyl glycol (NPG), p-hydroxybenzoic acid (PHBA), salycilic acid, m-hydroxybenzoic acid (MHBA), xylene, and methyl isobutyl ketone (MIBK) were purchased from Aldrich. p-Toluenesulfonic acid (p-TSA) was purchased from Matheson. "Aromatic 150" solvent and "Resimene 7A6", a hexakis(methyloxymethyl)melamine (HMMM) resin were supplied by Exxon and Monsanto, respectively. "Bonderite 1000" pretreated cold-rolled steel panels 3"x9"x2AGA were purchased from Parker. 

Toxicity. Methyl isobutyl ketone (MIBK) is an irritant of the eyes, mucous membranes, and skin high concentrations cause narcosis in animals, and it is expected that severe exposure will cause the same effect in humans. 

Gagnon P, Mergler D, Lapare S Olfactory adaptation, threshold shift and recovery at low levels of exposure to methyl isobutyl ketone (MIBK). Neurotoxicology 15(3) 637-642, 1994... 

Aldol chemicals refer to a variety of substances desired from acetone involving an aldol condensation in a portion of their synthesis. The most important of these chemicals is methyl isobutyl ketone (MIBK), a common solvent for many coatings, pesticides, adhesives, and pharmaceuticals. Approximately 0.17 billion lb of MIBK were made in recent years. The synthesis is outlined on the next page. 

The crude tetrachloride mixture of zirconium and hafnium is dissolved in ammonium thiocyanate solution. The solution is extracted with methyl isobutyl ketone (MIBK). MIBK is passed countercurrent to aqueous mixture of tetrachloride in the extraction column. Halhium is preferentially extracted into MIBK leaving zirconium in the aqueous phase. Simultaneously, zirconium tetrachloride oxidizes to zirconyl chloride, ZrOCb. When sulfuric acid is added to aqueous solution of zirconyl chloride, the chloride precipitates as a basic zirconium sulfate. On treatment with ammonia solution the basic sulfate is converted into zirconium hydroxide, Zr(OH)4. Zirconium hydroxide is washed, dried, and calcined to form zirconium oxide, Zr02. 

According to the vendor, the total cost for treating an estimated 9800 m of contaminated soil at the Sweden 3 Chapman site, in Sweden, New York, for a 12-month duration was 52/m of soil (D18722Y, p. 134). Soil at this site was contaminated with trichloroethene (TCE), tetrachloroethene (PCE), acetone, methylethyl ketone (MEK), methyl isobutyl ketone (MIBK), toulene, and xylene. 

Photon sensitivities are measured relative to PMMA and were obtained by imaging a 1mm wide slit, illuminated by a 1000 watt Hg lamp focused through quartz condenser optics, onto the substrate for varying times. Exposure times were recorded as the time necessary to allow complete removal of the resist in the irradiated areas, with no thinning in the unexposed areas. The irradiated films were developed in methyl isobutyl ketone (MIBK)/2-propanol (7 3 v/v) for the copolymers and terpoly-mers, and MIBK for PMMA. 

An example of CO2 enhanced aqueous extraction is shown in Figure 7 for tetrabutylammonium picrate (TBAP). Three common solvents for PTC butyl acetate, methyl isobutyl ketone (MIBK) and methylene chloride were used as the organic phase. 

Reductive alkylation is an efficient method to synthesize secondary amines from primary amines. The aim of this study is to optimize sulfur-promoted platinum catalysts for the reductive alkylation of p-aminodiphenylamine (ADPA) with methyl isobutyl ketone (MIBK) to improve the productivity of N-(l,3-dimethylbutyl)-N-phenyl-p-phenylenediamine (6-PPD). In this study, we focus on Pt loading, the amount of sulfur, and the pH as the variables. The reaction was conducted in the liquid phase under kinetically limited conditions in a continuously stirred tank reactor at a constant hydrogen pressure. Use of the two-factorial design minimized the number of experiments needed to arrive at the optimal solution. The activity and selectivity of the reaction was followed using the hydrogen-uptake and chromatographic analysis of products. The most optimal catalyst was identified to be l%Pt-0.1%S/C prepared at a pH of 6. 

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