Showing papers on "Methyl isobutyl ketone published in 2019"
TL;DR: This review provides a state-of-the-science analysis of materials used as the selective layer(s) of PV/VP membranes in removing water from organic solvents.
Abstract: Organic solvents are widely used in a variety of industrial sectors. Reclaiming and reusing the solvents may be the most economically and environmentally beneficial option for managing spent solvents. Purifying the solvents to meet reuse specifications can be challenging. For hydrophilic solvents, water must be removed prior to reuse, yet many hydrophilic solvents form hard-to-separate azeotropic mixtures with water. Such mixtures make separation processes energy intensive and cause economic challenges. The membrane processes pervaporation (PV) and vapor permeation (VP) can be less energy intensive than distillation-based processes and have proven to be very effective in removing water from azeotropic mixtures. In PV/VP, separation is based on the solution-diffusion interaction between the dense permselective layer of the membrane and the solvent/water mixture. This review provides a state-of-the-science analysis of materials used as the selective layer(s) of PV/VP membranes in removing water from organic solvents. A variety of membrane materials, such as polymeric, inorganic, mixed matrix, and hybrid, have been reported in the literature. A small subset of these are commercially available and highlighted here: poly(vinyl alcohol), polyimides, amorphous perfluoro polymers, NaA zeolites, chabazite zeolites, T-type zeolites, and hybrid silicas. The typical performance characteristics and operating limits of these membranes are discussed. Solvents targeted by the U.S. Environmental Protection Agency for reclamation are emphasized and ten common solvents are chosen for analysis: acetonitrile, 1-butanol, N,N-dimethyl formamide, ethanol, methanol, methyl isobutyl ketone, methyl tert-butyl ether, tetrahydrofuran, acetone, and 2-propanol.
93 citations
TL;DR: In this article, a heterogeneous niobium-loaded montmorillonite (Nb-MMT) catalysts containing Lewis and Bronsted acid sites have been synthesized by a readily cation-exchanged synthetic method and were used to convert glucose and showed high selectivity and conversion.
55 citations
TL;DR: In this paper, depolymerization of isolated lignin from organosolv fractionation of bagasse in the presence of several homogeneous and heterogeneous acid catalysts was studied.
54 citations
TL;DR: It is demonstrated that aqueous ChCl/MIBK biphasic system was an effective solvent system for co-production of furfural, high quality technical lignin and digestible cellulose for further upgrading.
48 citations
TL;DR: A novel synthesis method of nanoscale zerovalent iron (NZVI) using Fe sources in coal fly ash (CFA) for the oxidative degradation of methyl orange by Fenton reaction and the heterogeneous Fenton Reaction initiated by NZVI-CFA with H2O2 showed reactivity similar to that of the homogeneous Fetus reaction.
37 citations
TL;DR: In this paper, a biphasic system with methyl isobutyl ketone (MIBK) as an organic solvent was applied to enhance the transfer of 5-HMF from aqueous phase.
Abstract: A continuous packed-bed reactor was applied for the synthesis of 5-HMF via dehydration of fructose. Cation exchange rasin functionalized with sulfonic acid groups; -HSO3 was used as catalyst. 1-methyl-2-pyrrolidinone (NMP) was used as aqueous solvent to partially substitute water. A biphasic system with methyl isobutyl ketone (MIBK) as organic solvent was applied to enhance the transfer of 5-HMF from aqueous phase. Effects of reaction temperature (90–120 °C), residence time (10–60 min), water content in the aqueous phase (30–100 %wt.), and organic-to-aqueous ratio (1:1–4:1) on the conversion of fructose, %yield and selectivity of 5-HMF, and extraction ratio were investigated. High yield of 5-HMF was obtained with increasing reaction temperature or reaction time. Adding NMP enhanced the fructose conversion and selectivity toward 5-HMF to 91.67% and 99.76% at 120 °C, residence time of 30 min, NMP-to-water ratio of 7:3, and organic-to-aqueous ratio of 4:1, while the extraction ratio was 81.83%.
32 citations
TL;DR: In this article, a synergistic phenols extraction process by using optimal design solvent mixture was proposed with the volume ratio of methyl isobutyl ketone (MIBK) to n-pentanol 6:4.
28 citations
TL;DR: In this paper, the effects of concentration of organic synergist and total organic extractant, molar ratio of Fe/Li, phase ratio, counter-current extraction and acidity of stripping agent on lithium extraction were investigated to optimize the extraction conditions.
25 citations
TL;DR: An important theoretical basis for the application of ILs in the field of biomass was provided, it was the conclusion that a large amount of humins were produced during the cellobiose conversion process.
Abstract: Bronsted-Lewis acidic ionic liquids (ILs) were applied to catalyze cellobiose to prepare levulinic acid (LA) in one pot under hydrothermal conditions. Under the optimum conditions, the highest LA yield of 67.51% was obtained when low [HO3S-(CH2)3-mim]Cl-FeCl3 (molar fraction of FeCl3 x = 0.60) was used. This indicated the Bronsted-Lewis acidic ILs played an active role in the conversion of cellobiose to LA. The catalytic mechanism of ILs had been established, disclosing that the Bronsted-Lewis acidic ILs had the catalytic synergistic effect originating from its double acid sites. During the reaction process, the Lewis acid sites improved the isomerization of glucose to fructose, then the Bronsted and Lewis acid sites simultaneously enhanced the dehydration of fructose to produce hydroxymethylfurfural (HMF), which was propitious to the synthesize LA with high yield. In addition, LA could be easily extracted by methyl isobutyl ketone (MIBK), and the ILs could retain its basic activity after 5 cycles. The solid residues were characterized using SEM, FT-IR and TG-DTG spectroscopy. It was the conclusion that a large amount of humins were produced during the cellobiose conversion process. In this reaction, the ILs not only overcomes the problems of the conventional catalyst, but also completes the reaction-separation integration and the recycling of the catalyst. This paper provided an important theoretical basis for the application of ILs in the field of biomass.
22 citations
TL;DR: In this article, the solubility of Glavinclamide (GCM) in 11 monosolvents (methanol, ethanol, 1-propanol, 2-Propanol 2, 1-butanol, 2 butanol, acetone, acetonitrile, methyl isobutyl ketone, methyl acetate and ethyl acetate) and binary solvents was determined through a gravimetric method.
Abstract: Glibenclamide (GCM) is an oral antihyperglycemic drug and widely used to treat type-II diabetes. The quality of the GCM product impacts the efficacy of the medicine. However, the quality of the product is determined by the crystallization process, in which the solubility property plays a significant role. In this study, GCM solubility in 11 monosolvents (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, acetone, acetonitrile, methyl isobutyl ketone, methyl acetate and ethyl acetate) and (acetone + acetonitrile) binary solvents, has been determined through a gravimetric method from 283.15 K to 323.15 K. It elucidates that GCM has the highest solubility in acetone among the 11 monsolvents. Meanwhile, the solubility of GCM in (acetone + acetonitrile) binary solvents increases when the mole fraction of acetone rises. Then, we correlated the solubility data in monosolvents using the modified Apelblat model and nonrandom two-liquid (NRTL) model. Besides, the modified Apelblat model, the CNIBS/R-K...
22 citations
TL;DR: In this article, the authors demonstrate that 5-hydroxymethylfurfural (HMF) can be chemically derived from commercial chitosan (CScom) using solid acids in a reaction carried out using Nafion®50 resin (NR50) in a co-solvent system of methyl isobutyl ketone (MIBK) and DI water (V/V = 2).
TL;DR: Sodium phosphomolybdate with a spatial stereo symmetry structure and stability in acid and alkali was used as a new coextraction agent for separating Li+ as discussed by the authors.
Abstract: Sodium phosphomolybdate with a spatial stereo symmetry structure and stability in acid and alkali was used as a new coextraction agent for separating Li+. In addition, methyl isobutyl ketone and tr...
TL;DR: A flow injection solid phase extraction system coupled with flame atomic absorption spectrometer for automatic trace metal determination has been developed in this paper, where the efficiency of two commercially available low-cost polymers (high-density polyethylene and polypropylene) as packing materials in on-line preconcentration columns for metal extraction was evaluated.
TL;DR: In this paper, a bifunctional catalyst comprised of Pd nanoparticles encapsulated in a solid acid mesoporous HZSM-5 zeolite for one-step synthesis of methyl isobutyl ketone (MIBK) from acetone at 150°C and atmospheric pressure.
Abstract: Here we report a bifunctional catalyst comprised of Pd nanoparticles encapsulated in a solid acid mesoporous HZSM-5 zeolite for one-step synthesis of methyl isobutyl ketone (MIBK) from acetone at 150 °C and atmospheric pressure. The Pd nanoparticles are encapsulated in conventional HZSM-5 and mesoporous HZSM-5, prepared using a carbon template procedure. The nanoparticles are encapsulated using in situ encapsulation during the zeolite synthesis and post impregnation to investigate the effect of preparation procedure, zeolite confinement and distribution of nanoparticles. Additionally, the influence of Si to Al ratio of HZSM-5 zeolite and hence the effect of acidity was also analyzed. The prepared materials are characterized with various techniques including SEM, TEM, XRF, nitrogen physisorption and XRD among others. Of different materials, palladium nanoparticles encapsulated inside mesoporous zeolite via in situ encapsulation (Pd@MesoHZSM-5) were found to be the most active and highly selective (> 99%) for the formation of MIBK with a conversion of 37%. Moreover, the mesoporous zeolite structure increased the mass transfer and thereby enabling acetone to diffuse easily to the active sites excluding the formation of by-products.
TL;DR: In this article, the mixed solvent of octanol (NOA) and methyl isobutyl ketone (MIBK) was used as extractant to purify wet process phosphoric acid from hydrochloric acid route.
TL;DR: In this paper, the effects of solvent type and temperature on acetic acid removal from water were compared with NRTL model, presenting root mean square deviation equal to 1.2366% for 66 tie lines.
TL;DR: A kinetic analysis of the extraction process indicated the competition between 5-HMF and glucose adsorption as the main cause of the poor results obtained with AC, and very promising results were obtained with CNTs, with complete transfer of HMF and a high global mass-transfer coefficient.
Abstract: Different carbonaceous materials were tested as mass-transfer promoters for increasing the yield of 5-hydroxymethylfurfural (5-HMF) in biphasic cellulose hydrolysis. The benefits of working with a biphasic system (water/methyl isobutyl ketone) under soft acid conditions were taken as starting point (no humins or levulinic acid production), with slow extraction kinetics as the weakest point of this approach. Carbon nanotubes (CNTs) and activated carbon (AC) were proposed to improve 5-HMF liquid-liquid mass transfer. A kinetic analysis of the extraction process indicated the competition between 5-HMF and glucose adsorption as the main cause of the poor results obtained with AC. In contrast, very promising results were obtained with CNTs, mainly at 1.5 wt % loading, with complete transfer of HMF and a high global mass-transfer coefficient. The use of CNTs improved the amount of 5-HMF in the organic phase by more than 270 %.
TL;DR: In this article, a bifunctional catalyst TiO2/Al2O3 and Pd/Cor was used for one-pot liquid-phase synthesis of MIBK from acetone.
Abstract: We reported a bifunctional catalyst TiO2/Al2O3 and Pd/Cor for one-pot liquid-phase synthesis of MIBK from acetone in this paper. The characterizations of FT-IR, Raman spectra, TEM, XPS, CO2-TPD, NH3-TPD, Py-IR and TGA spectra revealed that the TiO2/Al2O3 could possess more acid sites and especially Lewis acid sites due to the coexistence of TiO2 and Al2O3. So a higher acetone conversion 35–45% at 150 °C and 2.0 MPa pressure was achieved than ever reported for MIBK liquid-phase synthesis. In addition, the catalyst could keep active for at least 90 h on stream at 80–90% MIBK selectivity. The phenomenon of carbonaceous accumulation on TiO2/Al2O leaded to the deactivation of catalyst. Because of the coexistence of TiO2 and Al2O3. TiO2/Al2O3 could have more acid sites and especially Lewis acid sites. For liquid-phase synthesis of methyl isobutyl ketone, bifunctional catalyst TiO2/Al2O3&Pd/Cor showed higher acetone conversion.
TL;DR: In this article, a modified Rose vapor recirculating-type equilibrium still was used to check the thermodynamic consistency of the experimental data, and the non-random two-liquid, universal quasichemical, and Wilson models were used for correlation and regression of experimental data.
Abstract: Vapor–liquid equilibrium data for the binary systems of 1-butanol + N,N-dimethylacetamide and methyl isobutyl ketone + N,N-dimethylacetamide were measured at 101.3 kPa. The vapor–liquid equilibrium experiments of two systems were carried out in the modified Rose vapor recirculating-type equilibrium still. Van Ness and Herington tests were used to check the thermodynamic consistency of the experimental data. After meeting the thermodynamic consistency test, the nonrandom two-liquid, universal quasichemical, and Wilson models were used for correlation and regression of the experimental data. The binary interaction parameters of each model for the two binary systems were obtained. Comparing the equilibrium temperature and vapor-phase mole fraction for the experimental value and the calculated value, it shows that the two models had a good correlation with the experimental data.
TL;DR: In this article, the authors investigated the effect of [EMIM][BF4] on the phase equilibria of methyl isobutyl ketone (MIBK) or 2-pentanol, HMF, water systems in the absence and presence of NaCl.
TL;DR: In this paper, the solubility of Dimethylaminomicheliolide Fumarate Salt (DFS) in three binary solvent mixtures, including 1,4-dioxane, acetonitrile and methyl isobutyl ketone, was determined by the gravimetric method at temperatures ranging from 288.15 K to 328.15
TL;DR: In this paper, the authors examined the reactive extraction of propionic acid, a promising liquid-liquid extraction technique, using tri-n-octylphosphine oxide (TOPO) or dioctylamine (DOA) diluted with eight different solvents at 298.15 K to determine the most efficient mixture for the extraction processes.
Abstract: This work examines the reactive extraction of propionic acid, a promising liquid–liquid extraction technique, using tri-n-octylphosphine oxide (TOPO) or dioctylamine (DOA) diluted with eight different solvents (n-octane, methyl isobutyl ketone (MIBK), 1-octanol, ethyl methyl ketone, diisobutyl ketone, n-decane, diethyl sabecate, 1-decanol) at 298.15 K to determine the most efficient mixture for the extraction processes. A phosphorous-based extractant, TOPO, has been chosen for the extraction tests since it has low water solvency and is more ecologically agreeable than the amine-type extractants. Among the other amine extractants reported in reactive extraction studies, there is no study on propionic acid extraction using DOA in the literature. Physical extraction experiments with pure solvents were also performed to analyze the effect of TOPO and DOA on the extraction process. Distribution coefficients, loading factors, and extraction yields of the processes were determined for the explanation of the resu...
TL;DR: In this paper, a novel Pd/S(PS-GO) was fabricated via in situ microemulsion polymerization, followed by sulfonating and Pd loading, and both the long-term catalytic performance of PdS(Ps-GO)-and Pd-SPS catalysts were tested in a trickle-bed reactor.
TL;DR: In this paper, a Raney-Ni catalyst was used for the hydrogenation of four bio-oil model compounds and their binary mixtures to assess their reactivity under mild conditions suitable for biooil stabilization preceding green diesel production from lignocellulosic biomass.
Abstract: Lignocellulosic biofuels are the most promising sustainable fuels that can be added to the crude oil pool to refill the dwindling fossil resources. In this work, we tested a Raney-Ni catalyst for the hydrogenation of four bio-oil model compounds and their binary mixtures to assess their reactivity under mild conditions suitable for bio-oil stabilization preceding green diesel production from lignocellulosic biomass. The hydrogenation experiments were performed at ambient hydrogen pressure at temperatures in the range 30–70 °C. Raney-Ni was found to hydrogenate all investigated model compounds efficiently; both carbonyl groups and double bonds were saturated. In addition, it was also active in the demethoxylation of guaiacol. When studying the binary mixtures, furfuryl alcohol was found to significantly inhibit the hydrogenation of the other model compounds (guaiacol and methyl isobutyl ketone) due to their very strong adsorption.
TL;DR: In this article, a novel time-based flow-injection-solid-phase extraction system (FI-SPE) coupled with flame atomic absorption spectrometry (FAAS) for automatic on-line preconcentration and determination of thallium was developed.
Abstract: A novel time-based flow-injection–solid-phase extraction system (FI–SPE) coupled with flame atomic absorption spectrometry (FAAS) for automatic on-line preconcentration and determination of thallium was developed. The efficiency of poly-tetrafluoroethylene (PTFE) turnings packed into a column as sorbent material was investigated for thallium extraction. Total thallium was determined by oxidizing thallium(I) to thallium(III), adding bromine in acidic solution. The formed [TlBr4]− anionic bromo complex was retained onto the PTFE turnings by on-line mixing with sodium diethyl dithiocarbamate (DDTC). The preconcentrated Tl(III)-DDTC complex was then effectively eluted with methyl isobutyl ketone (MIBK) and introduced into the flame atomizer for measurement and quantification. The column proved to be effective, stable, and reproducible, with a long lifetime. The enrichment factor was 105 for 60 s preconcentration time, and the sampling frequency 40 h−1. The detection limit was 1.93 μg L−1, and the relative standard deviation (RSD) was 3.2% at 50.0 μg L−1 concentration. The accuracy of the proposed method was estimated by analyzing certified reference materials and environmental and biological samples.
TL;DR: Methyl isobutyl ketone (MIBK) has been successfully employed to extract phenols from coal gasification wastewater since 2009, and it has been proved to be an excellent extraction solvent.
Abstract: Methyl isobutyl ketone (MIBK) had been successfully employed to extract phenols from coal gasification wastewater since 2009, and it has been proved to be an excellent extraction solvent. In this w...
TL;DR: In this article, solvent regeneration processes for liquid-liquid extraction of succinic acid (HSuc) from aqueous streams were investigated, and a combination of a swing in diluent and temperature results in higher product concentrations after back-extraction, and reduced the energy input to obtain the pure HSuc to 19'MJ/kg.
Abstract: Solvent regeneration processes for liquid-liquid extraction of succinic acid (HSuc) from aqueous streams were investigated Tri-n-octyl amine (TOA) and tri-n-octyl phosphine oxide (TOPO) in methyl isobutyl ketone (MIBK) showed good extraction For 20 wt% TOA in MIBK, addition of pentane at anti-solvent-to-solvent ratio of 1 (vol/vol) decreased K D from 102 to 046, applying ethane at 30 bar decreased K D to 045 and increasing the temperature to 60 °C decreased K D to 16 Evaporation of MIBK from a solvent of 40 wt% TOA in MIBK decreased K D from 102 to 40 For these processes, capital investments and energy requirements were calculated for 10 kiloton per year at a concentration factor of 5 Costs of all processes to obtain the product at maximum solubility are less than evaporation (2600 kJ/kg product at maximum solubility) A combination of a swing in diluent and temperature results in higher product concentrations after back-extraction, and reduced the energy input to obtain the pure HSuc to 19 MJ/kg The ethane-based process is most effective with 13 MJ/kg to obtain the pure HSuc product Although additional capital investments for compressors and pumps are required, only 110 days of production are required for return on investments
TL;DR: In this paper, the effects of NaCl, KCl and Na2SO4 on the liquid-liquid equilibrium (LLE) data for the ternary system, water+phenol+methyl isobutyl ketone, were determined at 0.101 MPa and 333.15 K.
TL;DR: In this paper, it was shown that the distribution ratios of trivalent lanthanide ions in extraction reactions may be affected by the denticity of a solvent extraction ligand for entropic reasons.
TL;DR: In this paper, a rhodium nanoparticle-supported (RhNPs) on mesoporous magnesia was used to conduct a one-step, gas-phase acetone self-condensation.
Abstract: Acetone is a cheap commodity chemical which can be used as an intermediate for the synthesis of numerous chemicals. Coupled with reductive hydrogenation, a multifunctional heterogeneous catalyst is required for the green chemistry of aldol condensation of acetone to produce β-hydroxyketone, enone (α,β-unsaturated ketone), ketone, and saturated and unsaturated alcohol. To that end, we prepared a rhodium nanoparticle-supported (RhNPs) on mesoporous magnesia to conduct a one-step, gas-phase acetone self-condensation. We observed both acetone conversion and selectivity towards either isopropyl alcohol or methyl isobutyl ketone depended on the hydrogen to acetone mole ratio, total flow rate, and reaction temperature. The optimum reaction conditions for a maximum yield of isopropyl alcohol (IPA) or methyl isobutyl ketone (MIBK) were established. Furthermore, 100 h on stream evidenced the long stability of our synthesized catalyst system for the production of isopropyl alcohol.