Showing papers on "Methyl isobutyl ketone published in 2010"

Extraction Equilibria of Acrylic Acid from Aqueous Solutions by Amberlite LA-2 in Various Diluents

Abstract: Amberlite LA-2 (a secondary amine mixture) has been studied for its ability to extract acrylic acid at different amine concentrations. The extraction of acrylic acid by Amberlite LA-2 dissolved in seven single solvents (cyclohexane, 2-octanone, toluene, methyl isobutyl ketone (MIBK), iso-octane, hexane, and 1-octanol) has been investigated with respect to different amine concentrations at 298.15 K. In the extraction, two acid−amine complexes, (HO):(R2N) and (HO):(R2N)2, have been assumed to exist in the organic phase in the case of proton-donating diluents, while the complexes (HO):(R2N) and (HO)2:(R2N)3 have been suggested in the case of nonproton-donating diluents. Important data for the design and analysis of different separation processes have been obtained as a result of batch experiments. These important data are distribution coefficients (D), loading factors (Z), extraction efficiency (E), and overall extraction constants (K11, K12, K23). The maximum removal of acrylic acid is 98.22 % with MIBK at ...

Excess Molar Enthalpies and Vapor—Liquid Equilibrium for N-Methyl-2-pyrrolidone with Ketones

Abstract: Excess enthalpies (HE), at ambient pressure and 298.15 K, have been measured by using a solution calorimeter for the binary liquid mixtures of N-methyl-2-pyrrolidone (NMP) with ketones, as a function of composition. The ketones chosen in the present investigation were methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone (CH). The HE values were measured using a new Parr 1451 solution calorimeter and were negative over the entire mole fraction range for NMP with MEK and were positive for NMP with MIBK or CH. The excess enthalpy data have also been correlated with the Redlich−Kister equation. Furthermore, the vapor−liquid equilibrium (VLE) data were measured at 95.3 kPa for these mixtures, of different compositions, with the help of the Swietoslawski ebulliometer. The experimental temperature−mole fraction (T−x) data were used to compute Wilson parameters and then used to calculate the equilibrium vapor-phase compositions. The intermolecular interactions and structural effects were an...

Batch Liquid‐Liquid Extraction of Phenol from Aqueous Solutions

Abstract: The aim of this work is the study of batch liquid-liquid extraction of phenol from aqueous solutions in a bench-scale well-mixed reactor. The influence of the ratio of phase volumes, temperature, and rotational speed on phenol removal (0.72–1.1 % w/w) was investigated using methyl isobutyl ketone as an extracting solvent. For this purpose, the ratio of phase volumes were set at 0.1 and 0.2, the temperature at 10, 20, and 30 °C, and the rotational speed at 300, 400, and 500 rpm. A physical model based on the material balance of the phases as well as the equation of mass flux between the phases allowed the estimation of the overall coefficient of mass transfer coupled with the superficial area. Moreover, it proved to fit, satisfactorily well, the experimental data of residual phenol concentration in the organic phase versus time under all the conditions investigated.

Biofiltration for removal of methyl isobutyl ketone (MIBK): experimental studies and kinetic modelling.

Abstract: The present study deals with the biofiltration of methyl isobutyl ketone (MIBK), which is considered to be a highly toxic volatile organic compound. It is released from the paint and petrochemical industries and is one of the major contributors to air pollution. The biofiltration study was carried out on a lab scale for two months in the presence of acclimated mixed culture. The performance of the biofilter column was evaluated for different inlet loads of MIBK at air flow rates ranging from 0.18 to 0.3 m3 h(-1). The maximum removal efficiency of 93% was obtained after 60 days of biofilter operation for an inlet MIBK concentration of 0.45 g m(-3), and a microbial concentration of 2.36 x 10(8) CFU g(-1) of packing material was obtained. This led to a study of shock loadings for 20 days, by varying the inlet MIBK load and air flow rate after every five days, to observe the behaviour of the biofilter column in removing sudden loads of MIBK. The biokinetic constants r(max) and Ks were obtained using the Michaelis-Menten kinetics and were found to be 1.046 g m(-3) and 0.115 g m(-3) h(-1),respectively, with a coefficient of determination (R2) of 0.993. The obtained experimental results were validated with the Ottengraf and Van den Oever kinetic model. The critical inlet concentration, critical inlet load and biofilm thickness were also estimated using the results obtained from the model predictions.

Synthesis of Methyl Isobutyl Ketone over Pd/MgO/SiO2

Abstract: In this paper, we have examined the activity and selectivity of catalysts for the one-step, gas phase production of methyl isobutyl ketone (MIBK) from acetone (propanone) over the temperature range 373−573 K. The catalysts used were an impregnated MgO/silica, a Pd-MgO/silica formed from coimpregnation of the nitrates, and a Pd supported on a 1% Mg doped silica, Pd/Mg-SiO2. Using MgO/silica, mesityl oxide (MO) was formed with 100% selectivity at 373 and 473 K. Addition of Pd gave 100% selectivity to MIBK at 373 K, albeit at low conversion. Pd-MgO/silica revealed a promotional effect of the MgO on the hydrogenation function of the Pd and a promotional effect of the Pd on the aldol condensation activity of the MgO. The Pd/Mg-SiO2 catalyst showed high selectivity but low conversion, as no promoting effect was observed.

Experiments on the Release of Gaseous Iodine from Gamma-Irradiated Aqueous CsI Solution and Influence of Oxygen and Methyl Isobutyl Ketone (MIBK)

Abstract: Volatile iodine production due to radiation chemical effects is known to be an important uncertainty source in the evaluation of the source term for severe accidents of light water reactors (LWRs). The gaseous release fractions of molecular iodine and organic iodine from gamma-irradiated 10−4 mol/L cesium iodide aqueous solution were measuredwith the dose rate ∼ 7 kGy/h at room temperature. The solution was buffered with 0.1 mol/L boric acid and sodium hydroxide (pH ∼7) and contained up to 10−3 mol/L methyl isobutyl ketone (MIBK) as an organic additive. The concentrations of MIBK in the solution and oxygen in the sweep gas were changed as experimental parameters. The total iodine release fraction of the original aqueous inventory and the fraction released as organic iodine were 2–47 and 0.02–1.5%, respectively, at the end of 2 h of irradiation. They were dependent on both the aqueous MIBK concentration and oxygen concentration in the sweep gas. Under a constant cover gas condition, the total iodine releas...

Synthesizing and utilizing novel nano crystalline zinc chromate supported nano palladium catalyst

Abstract: Several metal-supported catalyst compositions based on nano-crystalline zinc oxide were synthesized and characterized by X-ray powder diffraction (XRD), Carbon dioxide temperature programmed desorption (CO 2 TPD), and nitrogen adsorption at −196° C. The Pd-supported nano-ZnO mixed with different oxides such as Cr 2 O 3 , CrO 3 , MgO, and γ-Al 2 O 3 showed high catalytic activity in acetone condensation in gas-phase process under hydrogen flow. This reaction involves the base-acid coupling of acetone to form mesityl oxide, followed by its hydrogenation to methyl isobutyl ketone (MIBK). The novel catalyst 1% wt. n-Pd/n-ZnCr 2 O 4 was utilized during gas-phase reaction during production of MIBK. MIBK selectivity was 70-72% at 66-77% acetone conversion at 300-350° C. Diisobutyl ketone (DIBK) was the main by-product, with a total MIBK+DIBK selectivity up to 88%. The prepared catalysts showed stable activity and may be used repeatedly and for a longer period of time.

Silica glass modified with flavonoid derivatives for preconcentration of some toxic metal ions in water samples and their determination with ICP-MS

Abstract: Quercetin (3,3′,4′,5,7-pentahydroxyflavone) chemically bonded through pyran rearrangement on modified controlled pore silica glass (QCPSG) with a capacity 0.213 mmol/g was used for solid phase extraction of some toxic metal and metalloid ions. The newly designed QCPSG quantitatively sorbs As(V), Cd(II), Hg(II), and Pb(II) at the pH range 7.5–8.5 after 10 min of stirring. HCl (1 mol L − 1) instantaneously elutes all the metal ions. The sorption capacity of the ion collector is 0.42, 0.46, 0.53, and 0.49 mmol g − 1 for As(V), Cd(II), Hg(II), and Pb(II), respectively, whereas the preconcentration factor is 200. The effect of NaCl, Na2SO4, NaF, NaBr, Na3PO4, and other interfering salts on the sorption of metal ions (50 μg L − 1) was reported. Analytical detection limits of As(V), Cd(II), Hg(II), and Pb(II) were 4.18, 2.44, 15.86, and 25.00 pg mL − 1, respectively. QCPSG was used in the separation of the investigated metal ions from some natural water samples collected from diverse origins followed by determination by inductively coupled plasma–mass spectrometry. The data were compared with those obtained by the standard methods of determination using atomic absorption (hydride generation, HGAAS and after solvent extraction with ammonium pyrolidine dithiocarbamate/methyl isobutyl ketone). The suggested solid phase extraction method was found accurate with no random error.

Weather-resistant epoxy polyurethane anticorrosive paint and preparation thereof

Abstract: The invention relates to a weather resistant epoxy-polyurethane anti-corrosion coating and a manufacturing method thereof, which adds phenol-A epoxy resin, bisphenol-F epoxy resin, hydroxyl containedsaturated polyester resin and fluorocarbon resin into the mixed solvent of dimethylbenzene, n-butyl acetate, methyl isobutyl ketone and butanone; then adds rutile type titanium pigment, saponite, sericite in powder, polyacrylate co-polymer, polymethyl alkyl siloxane, benzotriazole, gas phase silica and iso-caprylic acid znic to make the fluid A of the weather resistant epoxy-polyurethane anti-corrosion coating while adds fatty group polyisocyanate into the mixed liquor of anhydro-dimethylbenzene and the n-butyl acetate to make fluid B, and mix the two components during application. The invention can be applied to the preservation of the surfaces of outdoor steel structures, pipes and concrete requiring weather resistance, light aging resistance and acid, alkali and salt corrosion resistance.

Solubility and tie-line data for water + formic acid + methyl isobutyl ketone ternary system at different temperatures

Abstract: The solubility and tie-line data of the ternary system comprising water, formic acid, and methyl isobutyl ketone were experimentally determined at the temperatures 288.15, 298.15, and 308.15 K, and atmospheric pressure 101.3 kPa. The plait points were also determined using Treybal's method. The results indicate that formic acid distributes preferentially in MIBK compared to water. Experimental tie-line data were regressed with the NRTL model to obtain binary interaction parameters. It is found that the NRTL model correlates the present system satisfactorily with average root-mean-square deviation of 0.34%.

Effect of Organic Solutions on the Stability and Extraction Equilibrium of Penicillin G

Abstract: The effects of organic solutions on the stability and extraction equilibrium of penicillin G were investigated. N-Butyl acetate, methyl isobutyl ketone, 2-ethyl hexanol, kerosene, and n-heptane were used for physical extraction; di-N-octylamine, tri-N-octylamine, N235 (a mixture of tertiary amines), tributyl phosphate, and di-(2-ethylhexyl)phosphoric acid were used as the extractants, with N-butyl acetate, kerosene, and n-heptane as diluents for reactive extraction. The degradation efficiency of penicillin G increases with increasing temperature. The stability of penicillin G was better in the presence of an amine-based extractant, while it was worse in the presence of a phosphorus acid extractant. The effect of neutral extractant on the stability of penicillin G was mainly dependent on the temperature. The degradation of penicillin G in alkali solution was governed by pH. The efficiency of physical extraction of penicillin G increased with decreasing pH in the aqueous solution. The efficiency of reactive...

Fluorine carbon silver powder baking finish and preparation thereof, special diluting agent and use method thereof

Abstract: The invention relates to a fluorocarbon aluminum powder baking paint which is made from components with following weight ratio: 40-50 of fluororesin, 15-25 of acrylic resin, 9-16 of amino resin, 03-10 of dispersant, 03-10 of wax powder, 005-015 of levelling agent, 55-85 of non-leafing aluminium paste, 3-8 of methyl isobutyl ketone, 6-12 of dimethylbenzene, and 3-8 of propylene glycol monoemethyl ether acetate The preparation method is that: pre-disperse the aluminium paste, add the dispersant after the fluororesin, the acrylic resin and the amino resin are agitated at intermediate speed to be evenly mixed, add the wax powder after agitating, add the leveling agent, the dimethylbenzene, the methyl isobutyl ketone and the propylene glycol monomethyl ether acetate when agitating at high speed to be uniformly blended; add the pre-dispersed aluminium paste into the paint vehicle, continue to agitate until the aluminium paste is uniformly dispersed, then filter to obtain the fluorocarbon aluminum powder baking paint The invention also relates to a special diluent and the using method The paint has the advantages of baking at medium temperature with high efficiency and low energy consumption; weather resistance approximate to PVDF fluorocarbon paint; re-coating without special processing, excellent adhesion between coatings; high rigidity; contamination resistance; no needof acid catalyst, good storage stabilization; and wide option of color

Isobaric Vapor−Liquid Equilibria for Binary and Ternary Mixtures with Cyclohexane, Cyclohexene, and Methyl Isobutyl Ketone at 100 kPa

Abstract: Consistent vapor−liquid equilibrium (VLE) data at 100 kPa have been determined for the ternary system cyclohexane + cyclohexene + methyl isobutyl ketone and two constituent binary systems: cyclohexane + methyl isobutyl ketone and cyclohexene + methyl isobutyl ketone. Both binary systems show positive deviations from ideal behavior and do not present an azeotrope. The VLE data have been correlated by the Wilson, UNIQUAC, and NRTL equations. The ternary system does not present an azeotrope and is well predicted from binary interaction parameters. Prediction with the UNIFAC method has also been obtained.

Method for fermenting, extracting and preparing high purity pleuromutilin raw material

Abstract: The invention discloses a method for fermenting, extracting and preparing high purity pleuromutilin raw material, comprising: filtering fermentation liquor used for fermenting and culturing pleurotusmutilus, and obtaining wet thallus containing the pleuromutilin; after drying the wet thallus, obtaining dry thallus; then, taking methyl isobutyl ketone as solvent for extracting for a plurality of times, and obtaining extracted filtrate; concentrating the filtrate, and obtaining concentrated solution containing the pleuromutilin; after carrying out temperature reduction and crystallization on the concentrated solution, obtaining crystalloid containing the pleuromutilin; and finally, vacuum drying and grinding the crystalloid, and obtaining the raw material powder of the pleuromutilin The method has simple technique and easy operation, and the obtained pleuromutilin has high yield, good quality and the content reaching more than 95%; furthermore, the methyl isobutyl ketone which is adopted as solvent has good dissolubility, can be recycled, is high in recovery rate, saves the using quantity of the solvent by about 15% compared with the existing technique, and has little environmentalpollution

Gasoline additive for purifying tail gas

Abstract: The invention relates to an additive for gasoline, in particular to an additive for gasoline, which can purify the tail gas discharged by a vehicle using the gasoline after being added into the gasoline and can also be used for directly replacing fuel. The additive of the invention contains methanol or ethanol, isopropanol, isobutanol, xylene, toluene, hydrogenated naphtha, isobutane, methyl tertiary butyl ether, benzyl alcohol, isopropylamine, isooctane, methyl isobutyl ketone and isohexane, wherein the weight ratio of the alcohols of the methanol or the ethanol, the isopropanol and the isobutanol accounts for 47%-55%, the weight ratio of the xylene and the toluene accounts for 19%-31%, and the weight ratio of the hydrogenated naphtha, the isobutane, the methyl tertiary butyl ether, the benzyl alcohol, the isopropylamine, the isooctane, the methyl isobutyl ketone and the isohexane accounts for 16%-23%. The invention has the advantages that after the additive is used, the content of the harmful gas in the tail gas of vehicles can be lowered, and the air pollution can be reduced, thereby reducing the damage of the tail gas of vehicles to the ozonosphere in the atmosphere and reducing the conditions of causing global warming.

Method for synthesizing methyl isobutyl ketone and diisobutyl ketone by acetone gas-phase one-step method

Abstract: The invention relates to a method for synthesizing methyl isobutyl ketone and diisobutyl ketone by an acetone gas-phase one-step method, which relates to a chemical solvent. A Pd/MgO-Al2O3-ZrO2 catalyst is used in the method, comprises the components of 1wt% of Pd, 55wt% of MgO, 10wt% of Al2O3 and 34wt% of ZrO2 and is prepared from a PdMgAlZr four-element houghite compound. under the condition that the reaction temperature is 150-200 DEG C,the liquid air speed is 4.8ml/gcat.h, and the hydrogen-ketone mol ratio is 1, in a fixed bed reactor, the acetone conversion rate is 30-73 percent, and theselectivity of the methyl isobutyl ketone and the diisobutyl ketone respectively reaches 50-60 percent and 23-30 percent. The catalyst has simple preparation process and is suitable for large-scale production. After the ZrO2 is added, the catalyst has proper acid-base property and higher activity. The catalyst can be simultaneously used for preparing the two products of the methyl isobutyl ketoneand the diisobutyl ketone.

Synthesis, characterization and activation of quaternary layered double hydroxides for the one-pot synthesis of methyl isobutyl ketone

Abstract: Quaternary hydrotalcite-like precursors containing Mg (II) Pd (II) Cu (II) Al (III) with (Pd + Cu + Mg)/Al ≈ 3 and varying Pd/Cu molar ratios were prepared by coprecipitation of metal nitrates at constant pH. The precursors and their calcined products were characterized by elemental analysis, powder XRD, TG-DTA, FT-IR diffuse reflectance, TPR and N 2 physisorption. Powder XRD indicated the formation of hydrotalcite of good crystallinity as the structure for all the precursors; the crystallinity decreased with increase of Pd 2+ and Cu 2+ in the Mg-Al brucite like layer. Thermal decomposition of HT-precursors at intermediate temperatures led to amorphous mixed oxides, PdCu/MgAl(O), which on reduction yielded a bi-functional catalyst, Pd 0 Cu 0 /MgAl(O). The resulting catalysts with acid, base and hydrogenating sites were highly effective and selective for the one-step synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen under mild conditions. Addition of copper with Pd inhibited the formation of hydrogenated by-products, propane-2-ol (IPA) and 4-methyl-pentane-2-ol (MIBA), which resulted an increase of MIBK selectivity and also the stability of the catalysts. A proper balance between acid-base and metallic sites was paramount for high catalytic performance.

Kinetics of the Syntheses of Mesityl Oxide (MO) and Methyl Isobutyl Ketone (MIBK) in a Fixed-Bed Flow Reactor (FBR)

Abstract: Nb2O5/SiO2 and Pd/Nb2O5/SiO2 catalysts were studied for the liquid phase syntheses of mesityl oxide (MO) and methyl isobutyl ketone (MIBK) in a fixed bed flow reactor (FBR). Catalyst activities as high as 1.7 g/h gcat and selectivities ranging from 93.4 to 100% for MO synthesis were observed. The catalyst activity was found to be a strong function of space velocity likely due to product inhibition. A synergistic effect was observed whereby the catalyst activity for all organic products increased by 22% and the MIBK productivity increased by 20% at 160 °C and WHSV = 8.6 h−1 from the introduction of hydrogen to the reactor. However, the MIBK selectivity was constrained to less than 83.5% due to competing reactions.