Showing papers on "Methyl isobutyl ketone published in 2015"

Solvent Mediation for Enhanced Separation of 5-Hydroxymethylfurfural from 1-Butyl-3-Methylimidazolium Chloride

Abstract: Ionic liquids have been widely studied as effective reaction media for the conversion of glucose or cellulose to 5-hydroxymethhylfurfural (5-HMF). However, the recovery of 5-HMF from ionic liquids, typically carried out by extraction, has been encountered with very low extraction efficiency, which limited the reusability of the solvents. Through this work, based on the model biphasic system that consists of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as the ionic liquid phase and methyl isobutyl ketone (MIBK) as the extractant phase, the dominant force that suppresses the extraction efficiency of 5-HMF was identified as being the strong hydrogen bonding between 5-HMF and [BMIM]Cl. Solvent mediation with functional promoters have been established as a new strategy to shift this force, resulting in improved extraction efficiency of 5-HMF from the ionic liquid. For example, with ethanol as a promoter, the distribution coefficient of 5-HMF was about 10 times higher than that without a promoter.

Reactive extraction of acrylic acid using trioctylamine (TOA) in versatile diluents

Abstract: Herein, since the extraction of organic acids is very important for recovery, acrylic acid was investigated from aqueous solutions by different diluents of trioctylamine (TOA). The extraction of acrylic acid with TOA dissolved in various individual solvents has been worked. Solvents have selected as dimethyl phthalate (DMP), cyclohexyleacetate (CHA), methyl isobutyl ketone, 2-octanone, 1-octanol, and 1-decanol. The experimental results of experiments are reported as distribution coefficients, D, loading factors, Z, and extraction efficiency, E. It is essential to improve extraction by adding extractant. The maximum removal of acrylic acid is 97.32% with DMP 1.15 mol/kg initial concentration of TOA. Here in, the LSER model has been applied to TOA + alcohol systems on extraction of acrylic acid to make predictions of distribution coefficient.

Extraction Equilibria of Glycolic Acid Using Tertiary Amines: Experimental Data and Theoretical Predictions

Abstract: Extraction equilibrium of glycolic acid (1.5 mol·kg–1) from aqueous solutions has been carried out using a solvent/extractant consisting of 50 vol % trioctylamine (TOA) and 50 vol % tridodecylamine (TDA) in the concentration range of 0.194 mol·kg–1 to 1.163 mol·kg–1. The extract phase is diluted with dimethyl phthalate (DMP), methyl isobutyl ketone (MIBK), 2-octanone, 1-decanol, and cyclohexylacetate (CHA). The data are represented by calculating distribution coefficients (D), loading factors (Z), and extraction efficiencies (% E) using experimental values. The highest value of D for the glycolic acid extraction is found to be 4.44 for DMP, 4.09 for MIBK, 3.78 for 2-octanone, 3.51 for 1-decanol, and 2.71 for CHA. A substantial amount (73.05 % to 81.61 %) of glycolic acid is recovered by all the amine-diluent systems and at 1.163 mol·kg–1 initial concentration of (TOA + TDA) mixture.

Cascade engineered synthesis of ethyl benzyl acetoacetate and methyl isobutyl ketone (MIBK) on novel multifunctional catalyst

Abstract: A novel trifunctional catalyst with basic, acidic and metal sites was synthesized by nanocolloidal method and used in industrially important reactions. in the laboratory. The synthesized catalyst consisted of palladium and hydrotalcite supported on transition metal modified hexagonal mesoporous silica (HMS) and was characterized in virgin and reused states using a number of techniques such as elemental analysis, FTIR, NH 3 − TPD, CO 2 − TPD, H 2 − TPR, XRD and BET surface area. The activity of particular catalytic site was engineered so that a desired reaction pathway was followed in spite of possibility of multiple series and parallel or complex reactions. One pot cascade engineered synthesis of ethyl benzyl acetoacetate from benzaldehyde and ethyl acetoacetate was studied in solvent free condition in a batch reactor. The effects of various parameters on the rates of reaction were analysed to establish instantaneous selectivity. Reaction mechanism and kinetic modelling was studied to validate the experimental results. The reaction follows Langmuir-Hinshelwood-Hougen-Watson mechanism involving weak adsorption of reactants and products. The apparent activation energy was found to be 13 kcal/mol and intrinsic kinetic constant 33 cm 6 mol −1 g cat −1 s −1 . This study was further extended to synthesis of methyl isobutyl ketone (MIBK) from acetone in solvent free condition. Similar experimental and theoretical analysis was done for MIBK synthesis for which the activation energy and intrinsic kinetic constant were found to be 12 kcal/mol and 4 cm 6 mol −1 g cat −1 s −1 , respectively.

Standardization of solvent extraction procedure for determination of uranium in seawater

Abstract: Solvent extraction procedure using ammonium pyrolidine dithiocarbamate complexing agent in methyl isobutyl ketone organic phase and acid exchange back-extraction is described for the simultaneous quantitative pre-concentration of uranium in seawater followed by its determination by differential pulse adsorptive stripping voltammetry. Solvent extraction time is optimized for extraction of uranium from seawater. Solvent extraction efficiency for uranium in seawater at different pH was carried out. The method gives a recovery of 98 ± 2 % for 400 mL sample at pH 3.0 ± 0.02, facilitating the rapid and interference free analysis of seawater samples.

Size change of silica nanoparticles induced by non-alcoholic solvent addition during sol–gel reaction

Abstract: The effect of solvent addition on particle size was investigated for silica nanoparticles synthesized by sol–gel reaction. In order to prepare solvent mixtures having a wide range of solvent polarity, non-alcoholic organic solvents with various dielectric constants were selected, such as toluene, N-methylformamide, chlorobenzene, methyl isobutyl ketone, and N,N-dimethylacetamide, which are firstly tested in this study as cosolvents for controlling the particle size of sol–gel silica. The role of the solvent dielectric constant during the sol–gel reaction is further clarified by experimental observation of increased particle size with low dielectric constant solvents (toluene, chlorobenzene, and methyl isobutyl ketone), and decreased particle size with high dielectric constant solvent (N-methylformamide and N,N-dimethylacetamide). Contradictory observations of particle size change according to water content are discussed in terms of its two competing roles—as a high-dielectric constant solvent and a hydrolysis reactant.

Preparation method of aviation kerosene or diesel oil scope liquid alkane

Abstract: Provided is an aviation kerosene (or diesel oil) liquid alkane fuel synthetic route which takes a lignocellulose based platform compound as raw material and is completely independent on fossil energy, wherein an obtained liquid fuel can be used as an aviation kerosene (or diesel oil) substitute product. The method comprises two parts: 1) under an alkali catalysis action, a lignocellulose based furfural compound (including furfural, methylfurfural, chloromethyl furfural or 5-hydroxymethyl furfural and the like) and a ketone compound (including acetone, butanone, 2-pentanone, 2-heptanone, cyclopentanone, mesityl oxide, methyl isobutyl ketone (MIBK), sodium 4-oxovalerate or levulinic acid ester and the like) are subjected to aldol condensation reaction to synthesize an oxygen-containing precursor with the carbon chain length of 9-16; and 2) a loaded metal A/X type dual-functional catalyst is adopted, the precursor produced in the step 1 is further subjected to a hydrogenation deoxidation reaction under conditions of low temperature and no solvent, and thus an aviation kerosene (or diesel oil) scope long-chain liquid alkane with the carbon chain length of 9-16 is obtained.

Stoichiometric and Spectroscopic Study of Reactive Extraction of Phenylacetic Acid with Tri-n-Butyl Phosphate

Abstract: Phenylacetic acid is widely used in the pharmaceutical industry for production of antibiotics. The recovery of phenylacetic acid from dilute aqueous waste with tri-n-butyl phosphate in methyl isobutyl ketone and petroleum ether has been attempted, and the results are presented in terms of distribution coefficient, extraction efficiency, apparent equilibrium constant, and loading ratio. The mechanism of reactive extraction was analyzed and the stoichiometric ratio of phenylacetic acid to tri-n-butyl phosphate in methyl isobutyl ketone and petroleum ether was found to be 1:0.5 and 1:1.2. Mass action law was used to represent the reactive extraction equilibrium for phenylacetic acid−tri-n-butyl phosphate−diluents which satisfied much in the present study. FTIR spectroscopy was studied for confirmation of the formation of a complex between acid and extractant. Further relative basicity approach has been extended to represent the experimental results. The model is best suited to experimental results.

Intensification of Citric Acid Extraction by a Mixture of Trioctylamine and Tridodecylamine in Different Diluents

Abstract: Extraction of citric acid (0.595 mol·kg–1) from aqueous solutions has been investigated by using binary extractant system comprising of trioctylamine (TOA) + tridodecylamine (TDA) at six different concentrations (0.19 mol·kg–1 to 1.16 mol·kg–1). The extractant system is diluted using five different solvents such as dimethyl phthalate (DMP), methyl isobutyl ketone (MIBK), 2-octanone, 1-decanol, and cyclohexylacetate (CHA). The batch extraction results of citric acid for the design of a separator have been obtained. The data are interpreted in terms of distribution coefficient (D), loading factors (Z), and extraction efficiency ( %E). The values of D for the citric acid extraction are found to vary from 0.40 to 118 for DMP, MIBK, and 2-octanone. For 1-decanol and CHA diluent, the values are observed in the range of 0.38 to 98.16 and 0.39 to 86.76, respectively. Considerable amount of citric acid is recovered (almost 99 %) by all the amine–diluent systems at 1.16 mol·kg–1 initial concentration of (TOA + TDA)...

The Application of Flame Atomic Absorption Spectrometry for Gold Determination in Some of Its Bearing Rocks

Abstract: A developed method was designed for gold determination directly in organic medium in some sedimentary rocks (fine sandstone, carbonates), pyrite, serpentine and international standard gold sample (MA-1a) using flame atomic absorption spectroscopy (FAAS). Instrumental parameters; burner angle, fuel flow rate, band pass and burner height together with chemical parameters; different media, leaching and interference effect were optimized to improve gold determination. Selective leaching using a new mixture (5% KCN, 5% Na2S2O3 and hydrogen peroxide) offered maximum leaching percentage of gold (>99%) with minimal concentration of accompanying elements. Extraction parameters using methyl isobutyl ketone (MIBK) from 3 M HCl were optimized for more than 99% gold extraction, followed by scrubbing using 0.1 M HCl. Gold was determined directly in organic phase. Beer’s law was obeyed from 0.01 μg/ml to 10 μg/ml. Standard deviation (from 0.017 to 1.05) and percentage error (from 1.5% to 2.5%) using the present developed AAS method were calculated.

Triphasic system for direct conversion of sugars to furandicarboxylic acid

Abstract: There is provided a one-pot process for the conversion of sugars to furancarboxylic acids, such as 2,5-furancarboxylic acid (FDCA), in a triphasic system (e.g. water or tetraethylammonium bromide (TEAB) – methyl isobutyl ketone (MIBK) – water). In this reaction setup, sugars are first converted to 5-hydroxymethylfurfural (HMF) in a first phase. Then HMF is then extracted into a second phase and transferred to a third phase of water. In the third phase HMF is converted to the furancarboxylic acid. The overall acid yields obtainable are between about 78% and 50% for conversion from fructose and glucose, respectively. The invention further relates to an apparatus for the triphasic reaction. The apparatus comprises two chambers which allow for the chemically separated reaction of the sugars and the intermediate of the sugars to form the final product in one process. The process according to the invention may be useful for industrial fabrication.

Weather-resistance water-resistance acrylate paint for scaffold

Abstract: The invention discloses weather-resistance water-resistance acrylate paint for a scaffold. The weather-resistance water-resistance acrylate paint for the scaffold comprises acrylic resin, nano-silicon sol, carbon black, nano-titanium dioxide, carbon nanotubes, nano-zinc oxide, ethylene glycol ethyl ether acetate, methyl isobutyl ketone, xylene, propylene oxide tert-butyl ether, chlorinated polypropylene, epoxy resin, amino resin, a silane coupling agent, lauryl acid phosphate, a wetting and dispersing agent, an antifoaming agent, a flatting agent, 2-O-methylation-beta-cyclodextrin and a corrosion inhibitor. The weather-resistance water-resistance acrylate paint for the scaffold is excellent in water resistance and weathering resistance, strong in adhesive force and good in flexibility.

Optimization of Auxiliary Solvent Demulsification Microextraction for Determination of Cyanide in Environmental Water and Biological Samples by Microvolume UV-Vis Spectrophotometry

Abstract: A new, simple, rapid and efficient solvent terminated-auxiliary solvent-dispersive liquid-liquid microextraction (ST-AS-DLLME) technique for determination of cyanide ions by microvolume UV-Vis spectrophotometry was developed. Effective parameters on the extraction and absorbance of cyanide were optimized using two optimization methods: fractional factorial design (FFD) and central composite design (CCD). Zinc(II) tetraphenylporphyrine (ZnTPP) was used as a selective cyanide receptor agent. Methyl isobutyl ketone (MIBK), ethanol and 1-butanol were used as extraction solvent, dispersive solvent and demulsifier solvent, respectively. The method shows very good selectivity in presence of other species. The analytical curve was linear in the range of 4.0-130 μg L -1 with a limit of detection of 1.0 μg L -1 . Relative standard deviation (RSD) of the method for ten replicate measurements of 100 μg L -1 of cyanide was 1.1%. The method was successfully applied for determination of cyanide in natural water and plasma samples with good spike recoveries.

Intensification and improvement of petrolatum deoiling process by using pure n-alkanes as non-polar modifiers

Abstract: a b s t r a c t In order to intensify and improve the deoiling process, Alexandria crude petrolatum was subjected to one-stage fractional crystallization (deoiling process) using butyl acetate and methyl isobutyl ketone solvents at different solvent feed ratios of dilution ranging from 2:1 to 8:1 at fixed washing solvent ratio of 2:1 and ambient fractionating temperature of 20

Treatment method of high-concentration phenolic wastewater generated in lignite upgrading process

Abstract: The invention discloses a treatment method of high-concentration phenolic wastewater generated in a lignite upgrading process. The method comprises the following steps: high-concentration phenolic wastewater subjected to deacidification and ammonia removal enters a plurality of extraction columns connected in series, each extraction column uses a fresh extractant to perform counter-current extraction on the phenolic wastewater, and cross-flow extraction is formed between every two extraction columns. The extractant can be methyl isobutyl ketone, mesityl oxide or tert amyl methyl ether. The number of the extraction columns can be 2-4. The amounts of the fresh extractants in the extraction columns can be different. After the wastewater treated by the method is subjected to solvent stripping, the optimal COD (chemical oxygen demand) can be down to 4000 mg/L below, and the total phenol content is lower than 220ppm, thereby completely satisfying the demands for conventional subsequent biochemical treatment.

Method for extracting 5-hydroxymethylfurfural from ionic liquid

Abstract: Disclosed is a method for extracting 5-hydroxymethylfurfural (5-HMF) from ionic liquid. Efficient transfer of 5-HMF from an ionic liquid phase to an extraction phase is realized by adding an extraction additive into a bi-phase extraction system consisting of an extraction agent and the ionic liquid containing 5-HMF. The extraction additive together with the ionic liquid cannot form two phases for the extraction additive is soluble in the ionic liquid, but the extraction additive can significantly improve a distribution ratio of 5-HMF to the extraction phase. For example, 5-HMF is extracted from [BMIM]Cl by taking methyl isobutyl ketone (MIBK) as an extraction agent; under the same conditions, the concentration ratio of 5-HMF in the MIBK phase to 5-HMF in the [BMIM]Cl phase is 5.76:100 if an extraction additive of methanol is added, the concentration ratio is 8.87:100 if an extraction additive of ethanol is added, while the concentration ratio is only 0.96:100 if no extraction additive is added. According to the invention, an effect of extracting 5-HMF from ionic liquid is effectively improved, so that the consumption of an extraction phase is decreased.

Method for synthesizing methyl isobutyl ketone from acetone by two-step process

Abstract: The invention relates to a method for synthesizing methyl isobutyl ketone from acetone by a two-step process. The method comprises the following steps: a fixed bed catalytic condensation reactor is filled with a solid catalyst, and acetone used as a reaction raw material is subjected to condensation-dehydration reaction on the catalytic condensation reaction bed to generate mesityl oxide and water; the product from the reactor enters a molecular sieve adsorption dehydration tank; the organic oil phase after dehydration enters a second fixed bed catalytic condensation reactor, and the acetone is further subjected to condensation-dehydration reaction to generate mesityl oxide and water; and the product enters a fixed bed catalytic hydrogenation reactor, the mesityl oxide is subjected to selective hydrogenation reaction on a Pd/Al2O3 catalyst to generate methyl isobutyl ketone, and the hydrogenation product is sent into a subsequent rectification separation system and subjected to separation to obtain the methyl isobutyl ketone product with the purity of greater than 99%. The invention provides a method for producing methyl isobutyl ketone from dimolecular acetone by a condensation-hydrogenation two-step process; and the acetone conversion rate is greater than or equal to 30.0%, and the methyl isobutyl ketone selectivity is greater than or equal to 99.0%.

Method for increasing ketone-alcohol ratio in hydrogenation reaction of anti-aging agent 4020 by modification-catalysis

Abstract: The invention belongs to the technical field of organic synthesis and specifically relates to a method for increasing the ketone-alcohol ratio in hydrogenation reaction of an anti-aging agent 4020 by modification-catalysis The method is characterized by preparing raw materials, namely 4-aminodiphenylamine, methyl isobutyl ketone (MIBK) and an ionic liquid into a raw material solution, loading a copper-based catalyst into a fixed bed reactor, and putting the raw material solution into the fixed bed reactor in a continuous feeding and discharging way for preparing the anti-aging agent 4020 by catalytic hydrogenation, wherein the ketone-alcohol ratio after the hydrogenation reaction is significantly increased The method provided by the invention is simple, convenient to operate, high in yield and good in selectivity, the MIBK becomes methyl isobutyl carbinol (MIBC) by hydrogenation, and side effects are obviously inhibited, so that the method is conductive to increasing the ketone-alcohol ratio after catalytic hydrogenation in industrial production, reducing the consumption of the MIBK and greatly reducing the production cost

Production process of methyl isobutyl ketone

Abstract: The invention provides a production process of methyl isobutyl ketone. The production process includes the following steps that a, hydrogen is conveyed into a water mist catcher for water removal; b, hydrogen and acetone are mixed and conveyed into a reactor to react, an adopted catalyst is strong acid positive ion exchange resin treated through palladium acetate, a reaction product is subjected to water removal again through hydrogen obtained after condensation separation and reused in the reactor for the reaction; c, alkali is added to a condensation product solution; d, the product solution to which alkali is added enters an acetone light-component tower to be separated, a solution produced from the bottom of the tower enters an acetone recovery tower for rectification, negative pressure operation is conducted in the acetone recovery tower, acetone produced from the top of the tower is reused in a fixed bed reactor, coarse MIBK produced from the bottom of the tower enters a phase separator; e, the coarse MIBK enters an MIBK light-component tower for rectification, heavy components produced from the bottom of the tower enter a finished MIBK tower for rectification, and finished MIBK is produced from the lateral line of the finished MIBK tower. Thus, energy utilization is greatly reduced, and meanwhile safe and efficient production can be facilitated while the utilization rate of original raw materials is guaranteed.

Extractability of Fumaric Acid by Tributyl Amine (TBA) in Ketones and Alcohols

Abstract: Fumaric acid extraction from aqueous media by tributyl amine (TBA), which is an aliphatic amine, was studied at 298 K. Ketones (methyl isobutyl ketone (MIBK), heptan-2-one, octan-2-one) and alcohols (isoamyl alcohol, octan-1-ol, decan-1-ol) were selected as the diluent for dissolving TBA. Distribution ratio (KD), loading ratio (T), and extraction degree (DE) were calculated from experimental results. 96% efficiency was reached with isoamyl alcohol at 2.08 mol·kg–1 of TBA concentration. Futher, the linear solvation energy relationship (LSER) modeling cooperated with Hidebrand–Hansen solubility parameters was used for prediction KD of alcoholic diluents. The LSER model gave closeness prediction to experimental data.

Solvent Effects on the Extraction of Copper(II) with Lauric Acid

Abstract: The solvent extraction of copper(II) from nitrate medium with lauric acid (HL) at 25°C is studied as a function of various parameters: pH, concentration of lauric acid and the nature of solvent. The solvent effects on the extraction of copper(II) using polar and nonpolar solvents are treated. Extracted species differs from solvent to solvent: CuL2 (HL)2 for cyclohexane, dichloromethane, toluene or chloroform and CuL2 for 1-octanol and methyl isobutyl ketone. The extraction constants, percentage extraction (%E) and free energy (ΔG°) are also calculated for different solvents.

Sulfonated graphene-Pd/silicon-aluminum oxide catalyst as well as preparation method and application of sulfonated graphene-Pd/silicon-aluminum oxide catalyst

Abstract: The invention relates to a sulfonated graphene-Pd/silicon-aluminum oxide catalyst as well as a preparation method and application of the sulfonated graphene-Pd/silicon-aluminum oxide catalyst The catalyst sulfonated graphene-Pd/silicon-aluminum oxide provided by the invention is applied to the synthesis of methyl isobutyl ketone by acetone through hydrogenation By utilizing the catalyst, the technology of synthesis of methyl isobutyl ketone by acetone through hydrogenation can be carried out at normal pressure, and is mild in reaction condition, the acetone conversion rate and the methyl isobutyl ketone selectivity which are higher than those of the prior art are obtained, wherein the acetone conversion rate is as high as 65%, and the methyl isobutyl ketone selectivity is as high as 86%

Method of extracting 5-hydroxymethyl furfural from ionic liquid

Abstract: A method of extracting 5-hydroxymethyl furfural from an ionic liquid. In the method, an extraction additive is added to a two-phase extraction system composed of an extraction agent and the ionic liquid containing 5-HMF to achieve high-effective transfer of the 5-HMF from an ionic liquid phase to an extract phase, wherein the extraction additive and the ionic liquid cannot form a two-phase system since the extraction additive is mutually soluble with the ionic liquid, but the extraction additive can significantly increase the distribution ratio of the 5-HMF in the extract phase. For example, with methyl isobutyl ketone (MIBK) as the extraction agent for extracting the 5-HMF from [BMIM]Cl, under same comparison conditions, the concentration ratios of the 5-HMF in the MIBK and the [BMIM]Cl are respectively 5.76:100 and 8.87:100 with addition of the extraction additive being methanol or ethanol, and without the extraction additive, the concentration ratio is only 0.96:100. The method effectively improves the extraction effect of the 5-HMF from the ionic liquid, thereby reducing the use amount of the extract phase.

Ultraviolet light resistant paint for scaffolds

Abstract: The invention discloses ultraviolet light resistant paint for scaffolds. The paint includes the following raw materials: acrylic resin, nano-silicon sol, chlorinated rubber, graphite, modified nano-silica, nano calcium carbonate, nano zinc oxide, aluminium oxide, molybdenum disulphide, ethylene glycol monoethyl ether acetate, methyl isobutyl ketone, propylene oxide tert-butyl ether, n-butyl acetate, pentamethylpiperidine d-tartrate, propylene glycol methyl ether acetate, triethyl citrate, chlorinated polypropylene, epoxide resin, amino resin, diethanolamine diacetone acrylamide amide, 10,10-oxybisphenoxarsine and an assistant. The ultraviolet light resistant paint provided by the invention is excellent in resistance to ultraviolet light radiation, good in weather resistance and comprehensive performance after coating on the surface of the scaffolds, and can prevent the scaffolds from corrosion.

Coating material for cables and preparation method thereof

Abstract: The invention discloses a coating material for cables and a preparation method thereof. The coating material for cables is prepared by using the following components in parts by weight: 20-30 parts of dimethacrylate triethylene glycol ester, 18-28 parts of methyl isobutyl ketone, 10-15 parts of polyacrylonitrile fiber, 8-12 parts of bis-(phenyl dimethyl siloxane) methylsiliconate, 3-8 parts of inorganic matter, 3-8 parts of maleic anhydride graft polypropylene, 2-5 parts of propylene oxide butyl ether and 0.5-1 parts of di-n-butyltin dilaurate. The invention further provides a preparation method of the coating material for cables.

Process for curing (meth)acrylate-containing up or ve resin

Abstract: Process for curing an unsaturated polyester resin or vinyl ester resin, the resin comprising a reactive diluent selected from the group consisting of acrylic acid, methacrylic acid, acrylates, methacrylates, acrylamides, methacrylamides, and combinations thereof, said process comprising the addition to said resin of (i) a ketone peroxide selected from the group consisting of methyl isopropyl ketone peroxide, methyl isobutyl ketone peroxide, cyclohexanone peroxide, and combinations thereof and (ii) a compound of a transition metal selected from the group consisting of Mn, Fe, and Cu, and combinations thereof.