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Showing papers on "Acetone published in 2014"


Journal ArticleDOI
TL;DR: In this article, a novel composite material GrO@MIL-101 was synthesized using a solvothermal synthesis method, and the results of characterization confirmed the formation of well-defined grO@mil-101 with higher surface area and pore volume compared to the MIL-101.
Abstract: A novel composite material GrO@MIL-101 was synthesized using a solvothermal synthesis method. Then the parent materials (MIL-101 and graphene oxide) and the GrO@MIL-101 were characterized using SEM, TEM, XRD, nitrogen sorption, and Raman. The acetone isotherms on the GrO@MIL-101 and MIL-101 were measured separately. The isosteric heat of adsorption and the desorption activation energies of acetone on the two samples were estimated. The results of characterization confirmed the formation of well-defined GrO@MIL-101 with higher surface area and pore volume compared to the MIL-101, and the crystal size of the MIL-101 in the composite was smaller than that of the parent MIL-101. The acetone isotherms on the GrO@MIL-101 were much higher than those on the MIL-101. The acetone adsorption capacity of the GrO@MIL-101 was up to 20.10 mmol g−1 at 288 K and 161.8 mbar, having an increase of 44.4% in comparison with the MIL-101. The desorption activation energy of acetone on the GrO@MIL-101 was higher than that on the MIL-101, indicating the stronger interaction between acetone molecules and the GrO@MIL-101. Consecutive cycles of acetone adsorption–desorption showed that the desorption efficiency of acetone on the GrO@MIL-101 can reach 91.3%. Acetone adsorption on this composite material was highly reversible.

195 citations


Journal ArticleDOI
TL;DR: This protocol combines TCA/acetone precipitation, which aggressively removes nonprotein compounds, and phenol extraction, which selectively dissolves proteins, resulting in effective purification of proteins from crop tissues.
Abstract: Crop plants contain large amounts of secondary compounds that interfere with protein extraction and gel-based proteomic analysis. Thus, a protein extraction protocol that can be easily applied to various crop materials with minimal optimization is essential. Here we describe a universal protocol for total protein extraction involving trichloroacetic acid (TCA)/acetone precipitation followed by SDS and phenol extraction. Through SDS extraction, the proteins precipitated by the TCA/acetone treatment can be fully resolubilized and then further purified by phenol extraction. This protocol combines TCA/acetone precipitation, which aggressively removes nonprotein compounds, and phenol extraction, which selectively dissolves proteins, resulting in effective purification of proteins from crop tissues. This protocol can also produce high-quality protein preparations from various recalcitrant tissues, and therefore it has a wide range of applications in crop proteomic analysis. Designed to run on a small scale, this protocol can be completed within 5 h.

160 citations


Journal ArticleDOI
TL;DR: In this paper, aldol condensation of furfural and acetone catalyzed by solid base catalysts (Mg Al hydrotalcites and Mg Al mixed oxides) was investigated as a method to valorize short chain ketones obtainable from biomass pyrolysis for the production of higher-molecular-weight products usable as fuel components.

133 citations


Journal ArticleDOI
TL;DR: In this article, aldol condensation of furfural and acetone in batch reaction conditions at T ǫ = 20-100°C and time 0-24h was investigated.

121 citations


Journal ArticleDOI
TL;DR: In this paper, the performance of three commercial poly(dimethylsiloxane) based membranes (Pervatech, Pervap 4060 and PolyAn) was studied in pervaporation of removal of acetone, butanol and ethanol from binary aqueous mixtures at 25°C.

118 citations


Journal ArticleDOI
TL;DR: Cerium dioxide was used as reactive sorbent for the degradation of the organophosphate pesticides parathion methyl, chlorpyrifos, dichlofenthion, fenchlorphos, and prothiofos, as well as of some chemical warfare agents as mentioned in this paper.

103 citations


Journal ArticleDOI
TL;DR: In this article, multiwall carbon nanotubes (MWCNTs)/snO 2 nanocomposites were synthesized by ultrasonic assisted deposition-precipitation method and used for detection of acetone in the same range of concentrations as in diabetes mellitus breath.
Abstract: Multiwall carbon nanotubes (MWCNTs)/SnO 2 nanocomposites were synthesized by ultrasonic-assisted deposition–precipitation method and used for detection of acetone in the same range of concentrations as in diabetes mellitus breath. The nanocomposite samples were characterized by BET, FE-SEM, XRD and TEM. MWCNTs with an average size of about 60 nm are coated with and uniformly dispersed in 5–10 nm SnO 2 nanoparticles matrix. To diagnose diabetes, the sensors responses to ppm concentrations of acetone were measured in a flow system at various temperatures and 85% relative humidity. Addition of MWCNTs dramatically enhances the sensors response to acetone. Moreover, the sensors response to ethanol, as an interfering species with acetone in human breath, was also measured. Breath humidity increases the conductivity of the sensing materials and therefore, lowers the sensors response to acetone.

100 citations


Journal ArticleDOI
Xue Bai1, Huiming Ji1, Peng Gao1, Ying Zhang1, Xiaohong Sun1 
TL;DR: In this article, the 3-mol% Cu-doped WO 3 hollow fibers using quenching for cooling exhibit high response and good selectivity to acetone, which could be attributed to their high surface-to-volume ratio and junction structure.
Abstract: Cu-doped WO 3 hollow fibers were prepared by electrospinning technique, combined with the sol–gel method and reasonable sintering procedure. The morphology and crystal phase structure were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The gas-sensing properties were investigated as functions of the amount of Cu element, concentration of acetone and cooling method. The 3 mol% Cu-doped WO 3 hollow fibers using quenching for cooling exhibit high response and good selectivity to acetone. The response of the hollow fibers to 20 ppm of acetone was 6.43, which could be attributed to their high surface-to-volume ratio and junction structure. Partial substitution of W 6+ in WO 3 with Cu 2+ and quenching treatment could lead to a triclinic phase structure, which has a low symmetry, large dipole moment and strong interaction with acetone molecules and results in a good selectivity to acetone gas. Therefore, Cu-doped WO 3 -based materials show the potential application for semiconducting gas sensors in the diagnosis of diabetes.

96 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated thermochemical liquefaction characteristics of sewage sludge in different organic solvents (methanol, ethanol and acetone) in an autoclave at different temperatures ranging from 260°C to 380°C with a fixed solid/liquid ratio.

82 citations


Journal ArticleDOI
TL;DR: In this paper, the regeneration of isopropanol and/or acetone saturated TiO2 surface by ozone is investigated using two parallel and complementary infrared diagnostics: (1) Fourier Transform Infrared Spectroscopy for the analysis of the gas phase composition; and (2) Diffuse Reflectance Infrared Fourier transform Spectrography for the in situ analysis of adsorbent/catalyst surface.
Abstract: The regeneration of isopropanol (IPA) and/or acetone saturated TiO2 surface by ozone is investigated TiO2 catalyst is placed downstream a dielectric barrier discharge and is subsequently exposed to ozone considered as the main oxidative species generated by non-thermal plasma and able to interact with the material surface at room temperature The oxidation of isopropanol and/or acetone is monitored using two parallel and complementary infrared diagnostics: (1) Fourier Transform Infrared Spectroscopy for the analysis of the gas phase composition; and (2) Diffuse Reflectance Infrared Fourier Transform Spectroscopy for the in situ analysis of the adsorbent/catalyst surface In this study, the pollutant is first adsorbed on the TiO2 surface, the plasma being switched off The irreversibly adsorbed amounts of isopropanol and acetone have been respectively quantified as 53 μmol/m2 and 19 μmol/m2 In a second step, the plasma is switched on to regenerate the surface by mineralization of the adsorbed organic species A 70-min plasma phase, with approximately 20 ppm of ozone constantly flowing through the adsorbent bed yields 85 nmol and 89 nmol of CO2 per injected joule of energy for isopropanol and acetone saturated surfaces, respectively Acetone has been evidenced as the main oxidation intermediate of isopropanol on TiO2 surface It has been proven that the complete oxidation of isopropanol and acetone is mainly limited by the acetone oxidation rate Competitive adsorption on the surface of the catalyst between both compounds has been studied Results obtained are compared with those observed in the photocatalytic oxidation of the same species

78 citations


Journal ArticleDOI
TL;DR: Aldol-condensation of furfural with acetone catalysed by activated dolomite was investigated at temperatures from 306 to 413 K in this article, where the process of activation by calcination and hydration produced catalytically active calcium and magnesium hydroxides.
Abstract: Aldol-condensation of furfural with acetone catalysed by activated dolomite was investigated at temperatures from 306 to 413 K. The process of activation by calcination and hydration produced catalytically active calcium and magnesium hydroxides with improved surface area and surface basicity. The aldol-condensation mechanism began with a deprotonation of acetone forming a carbanion intermediate by hydroxyl ions, which then reacted with the carbonyl group of furfural to form a water soluble C8 monomer (4-(furan-2-yl)-4-hydroxybutan-2-one). This C8 monomer readily dehydrated to form selectively α,β-unsaturated ketone (4-(2-furyl)-3-buten-2-one), which in turn, reacted with furfural forming a C13 dimer (1,4-pentadien-3-one,1,5-di-2-furanyl). Compared with conventional sodium hydroxide catalyst, activated dolomite was less selective towards lumped C8 monomers and C13 dimers owing to carbon losses and deactivation, particularly at high temperatures. Activated dolomite was more selective to C13 dimer owing to higher adsorption enthalpy of C8 monomer compared with acetone competitor. Activated dolomite is therefore a promising catalyst to produce C13 dimers which can be transformed upon hydrogenation and deep hydrodeoxygenation in high-quality diesel fuels. The first-order kinetic model with respect to furfural and acetone fitted well with actual experimental results with an average normalised standard deviation of 6.2%.

Journal ArticleDOI
TL;DR: In this article, a packed-bed dielectric barrier discharge (DBD) was developed for acetone removal, and the effects of packing materials were investigated in terms of discharge characteristics, removal efficiency and byproducts formation.

Journal ArticleDOI
TL;DR: In this article, a tandem plasma-catalytic reactor consisted of two ceramic-supported catalysts containing zinc oxide (ZnO) and/or manganese oxide (MnO2), in which the first supported catalyst was exposed to the plasma discharge and the second one was placed in the post-plasma region.

Journal ArticleDOI
TL;DR: In this article, activated carbons prepared from agricultural waste were modified to introduce surface acid sites by treatment with HNO3 or H2SO4, and they were studied as heterogeneous catalysts for the solvent-free acetalisation of acetone with glycerol to produce 2,2-dimethyl-1,3-dioxolane-4methanol (solketal).

Journal ArticleDOI
TL;DR: The results suggest that the use of bifunctional catalysts and aqueous phase lead to an effective integration of both reactions, and selectivities to n-alkanes higher than 50% were obtained using this catalyst at typical hydrogenation conditions.
Abstract: Integrating reaction steps is of key interest in the development of processes for transforming lignocellulosic materials into drop-in fuels. We propose a procedure for performing the aldol condensation (reaction between furfural and acetone is taken as model reaction) and the total hydrodeoxygenation of the resulting condensation adducts in one step, yielding n-alkanes. Different combinations of catalysts (bifunctional catalysts or mechanical mixtures), reaction conditions, and solvents (aqueous and organic) have been tested for performing these reactions in an isothermal batch reactor. The results suggest that the use of bifunctional catalysts and aqueous phase lead to an effective integration of both reactions. Therefore, selectivities to n-alkanes higher than 50% were obtained using this catalyst at typical hydrogenation conditions (T=493 K, P=4.5 MPa, 24 h reaction time). The use of organic solvent, carbonaceous supports, or mechanical mixtures of monofunctional catalysts leads to poorer results owing to side effects; mainly, hydrogenation of reactants and adsorption processes.

Journal ArticleDOI
TL;DR: In this article, a micro alga (Chlorella pyrenoidosa ) was treated in sub/supercritical acetone in the absence of catalyst by using a high pressure bath reactor.

Journal ArticleDOI
TL;DR: In this article, a continuous, easy to scale up, high yield, 100% selective ketalization of glycerol to solketal (4-hydroxy methyl-2,2-dimethyl-1,3-dioxolane) over Purolite® PD206 in subcritical acetone was presented.

Journal ArticleDOI
TL;DR: Dipotassium hydrogen phosphate (K2HPO4) has been investigated as an excellent salting-out agent to recover (acetone + butanol + ethanol) (ABE) from a prefractionator as mentioned in this paper.
Abstract: Dipotassium hydrogen phosphate (K2HPO4) has been investigated as an excellent salting-out agent to recover (acetone + butanol + ethanol) (ABE) from a prefractionator. The increasing additions of K2HPO4·3H2O to the ABE system under unsaturated conditons show strong salting-out effects on the ABE. This favorable salting-out effect is based on the hydration of the charged ions. The HPO42– ions may destroy the “hydration shell”, but the crescent concentrations of K2HPO4 make positive salting-out effects on the ABE. More acetone, 1-butanol, and ethanol are recovered after higher-level concentrations of K2HPO4 solution are added to the ABE system. Meanwhile, the equilibrium time shortens. A higher temperature can also make the equilibrium time shorter. The smallest amount of K2HPO4 in the organic phase causes no trouble for the (salting-out + distillation) process in an industrial application.

Journal ArticleDOI
TL;DR: In this paper, the effects of thermal regeneration of an activated carbon spent with volatile organic compounds (VOCs) on its adsorption capacities were examined using a thermo-gravimetric analyzer.
Abstract: Thermal swing adsorption (TSA) is widely used as a process in industry for gas purification and air treatment. This study enlightens the effects of thermal regeneration of an activated carbon spent with volatile organic compounds (VOCs) on its adsorption capacities. Ketone group VOCs (acetone and methyl ethyl ketone (MEK)) were selected for this study as they are sensitive to oxidation reactions at low temperature, and for this reason, are responsible for many reported fire accidents on industrial units. Cyclic adsorption–desorption experiments were performed using a thermo-gravimetric analyzer (TGA). First cycle adsorption capacity of acetone and MEK at 20 °C was 5.06 mol/kg and 6.41 mol/kg, respectively. The regeneration was performed with air at temperature ranging from 80 °C to 160 °C. Multiple cycles were successively repeated to assess the variations in the material adsorption performances. For acetone, it was found that after first regeneration cycle conducted at 80 °C, the adsorption capacity was restored at nearly 95%, and remained unchanged after 8 successive cycles. For MEK, continuous degradation of the adsorption capacities was observed, which was more drastic when the temperature was low and reached 3.4 mol/kg after 8 cycles. This could be related to the partial decomposition of the chemisorbed MEK molecules. Effect of air humidity was furthermore examined and a protocol was developed to guarantee good regeneration efficiency of MEK spent activated carbon at a moderate temperature.

Journal ArticleDOI
TL;DR: In this article, salting-out extraction and crystallization were combined to recover succinic acid from fermentation broths, and the results showed that a pH lower than the pK of succinic acids is beneficial for the recovery of the acid.

Journal ArticleDOI
TL;DR: The regenerated cellulose film with adjustable structure and properties may have potential applications in drug release and ultra filtration.

Journal ArticleDOI
TL;DR: In this article, the effect of relative humidity of air on the discharge characteristics, acetone removal efficiency, CO2 selectivity, and byproduct formation with and without catalyst has been investigated.
Abstract: A coaxial dielectric barrier discharge (DBD) plasma reactor has been developed for plasma-catalytic removal of low concentration acetone over MOx/γ-Al2O3 (M=Mn, Co, or Cu) catalysts. The effect of relative humidity of air (RH) on the discharge characteristics, acetone removal efficiency, CO2 selectivity, and byproduct formation with and without catalyst has been investigated. The results show that increasing the RH leads to a decrease of the specific energy density (SED) of the DBD, while packing γ-Al2O3 supported metal oxide catalysts into the discharge gap enhances the SED of the discharge. The maximum acetone removal of 75.3% is achieved at an optimum RH of 10% using CoOx/γ-Al2O3 beyond which the removal efficiency of acetone decreases with the increase of the RH. Higher RH inhibits the formation of energetic electrons while water can be adsorbed onto the catalyst surface and block active sites on the catalyst surface. It is found that increasing the air humidity enhances both CO2 selectivity and carbon balance, but decreases the formation of ozone. However, the formation of NOx slightly increases with increasing the gas humidity. In addition, the presence of these catalysts in the discharge significantly decreases the formation of unwanted byproducts (O3 and NOx) and promotes the deep oxidation of acetone towards CO2 with an increased carbon balance.

Journal ArticleDOI
TL;DR: 106 different compounds have been identified by GC-MS in the liquid products obtained in methanol at 563 K, and the highest conversion was obtained in acetone at the same temperature.

Journal ArticleDOI
TL;DR: The results demonstrate that L-valine is decomposed to acetone, formic acid, acetic acid, threo-methylaspartic Acid, erythro-methlyaspartIC acid, and pyruvic acid after direct exposure to DBD plasma.
Abstract: l-Valine solutions in water and phosphate buffer were treated with nonthermal plasma generated by using a dielectric barrier discharge (DBD) device and the products generated after plasma treatments were characterized by 1H NMR and GC-MS. Our results demonstrate that l-valine is decomposed to acetone, formic acid, acetic acid, threo-methylaspartic acid, erythro-methlyaspartic acid, and pyruvic acid after direct exposure to DBD plasma. The concentrations of these compounds are time-dependent with plasma treatment. The mechanisms of l-valine under the DBD plasma are also proposed in this study. Acetone, pyruvic acid, and organic radicals •CHO, CH3COCH2OO• (acetonylperoxy), and CH3COC(OH)2OO• (1,1-dihydroxypropan-2-one peroxy) may be the determining chemicals in DNA damage.

Journal ArticleDOI
TL;DR: The mutant strain designated as ART18, obtained from the wild-type strain Clostridium acetobutylicum PW12 treated by atmospheric and room temperature plasma, showed higher solvent tolerance and butanol production than that of the wild -type strain.
Abstract: The mutant strain designated as ART18, obtained from the wild-type strain Clostridium acetobutylicum PW12 treated by atmospheric and room temperature plasma, showed higher solvent tolerance and butanol production than that of the wild-type strain. The production of butanol was 11.3 ± 0.5 g/L, 31 % higher than that of the wild-type strain when it was used for acetone, butanol, and ethanol fermentation in P2 medium. Furthermore, the effects of cassava flour concentration, pH regulators, and vitamins on the ABE production were also investigated. The highest butanol production of 15.8 ± 0.8 g/L and butanol yield (0.31 g/g) were achieved after the above factors were optimized. When acetone, butanol, and ethanol fermentation by ART18 was carried out in a 15-L bioreactor, the butanol production, the productivity of butanol, and the total solvent were 16.3 ± 0.9, 0.19, and 0.28 g/L/h, respectively. These results indicate that ART18 is a promising industrial producer in ABE fermentation.

Journal ArticleDOI
TL;DR: In this article, ordered mesoporous In 2 O 3 with controlled morphology have been synthesized using container effect nanocasting method, which exhibited improved sensitivity (response of 29.8 to 50ppm of acetone at 300°C), faster response and recovery times (0.7 and 14 s) and higher selectivity to acetone.

Journal ArticleDOI
TL;DR: In this article, the authors studied the production of biodiesel from waste cooking oil with co-solvent technology and found that the optimum transesterification conditions to obtain the 98% purity of fatty acid methyl esters (FAMEs) are as follows: 1.5% potassium hydroxide catalyst, 20% acetone and 5:1 methanol to oil molar ratio, reaction temperature of 40 0 C and reaction time of 30 minutes.

Journal ArticleDOI
TL;DR: In this article, a systematic study of the effects of solvents such as water, methanol, ethanol, propanol, butanol, acetone, ethyl acetate, tetrahydrofuran and hexane on hydrogenation of a lignin-derived component of pyrolysis bio-oil, phenol, over activated carbon supported palladium catalysts was performed.
Abstract: Solvents play a pivotal role in many chemical reactions as well as in upgrading of pyrolysis bio-oil. Herein we report a systematic study of the effects of solvents such as water, methanol, ethanol, propanol, butanol, acetone, ethyl acetate, tetrahydrofuran and hexane on hydrogenation of a lignin-derived component of pyrolysis bio-oil, phenol, over activated carbon supported palladium catalysts. The solvents were classified into four groups so as to better understand the effect of them. For hydrogen bond donor–hydrogen bond acceptor (HBD–HBA) solvents and hydrogen bond acceptor (HBA) solvents, the conversion of phenol decreased with increasing polarity/polarizability π*. Phenol was converted completely in hexane or water at 250 °C. However, in methanol or ethanol, it was converted partially. Synergistic action of multiple factors had an effect on the hydrogenation of phenol. To convert phenol better, water and hexane as solvents were excellent in upgrading of pyrolysis bio-oil.

Journal ArticleDOI
TL;DR: In this paper, the influence of the type of catalyst, which determines the solid texture and number of Bronsted acid sites, and different reaction parameters, such as reaction time, reaction temperature, glycerol/acetone ratio, and catalyst amount on acetalization reaction was investigated.
Abstract: The acetalization of glycerol with acetone over modified mesoporous cellular foam materials has been widely investigated using in situ Raman spectroscopy during reaction. Mesoporous cellular foams (MCFs) modified by niobium or tantalum and (3-mercaptopropyl)trimethoxysilane (MP) followed by H2O2 treatment were used as catalysts in the acetalization of glycerol with acetone. The influence of the type of catalyst, which determines the solid texture and number of Bronsted acid sites, and different reaction parameters, such as reaction time, reaction temperature, glycerol/acetone ratio, and catalyst amount on acetalization reaction, were investigated. The results obtained in the characterization of the catalysts show that the materials obtained differ in the number of Bronsted acidic sites. Raman spectroscopy provides noninvasive insight during acetalization of glycerol with acetone in the presence of acid heterogeneous catalysts. The progress of the acetalization reaction was monitored following the variatio...

Journal ArticleDOI
TL;DR: An environmentally benign and convenient functionalized ionic liquid catalytic system was explored in the aldol condensation reactions of aromatic aldehydes with acetone, which proceeded more efficiently through microwave-assisted heating than through conventional thermal heating.
Abstract: Five quaternary ammonium ionic liquid (IL) and two tetrabutylphosphonium ILs were prepared and characterized. An environmentally benign and convenient functionalized ionic liquid catalytic system was thus explored in the aldol condensation reactions of aromatic aldehydes with acetone. The aldol reactions proceeded more efficiently through microwave-assisted heating than through conventional thermal heating. The yield of products obtained under microwave heating for 30 min was approximately 90%, and the ILs can be recovered and reused at least five times without apparent loss of activity. In addition, this catalytic system can be successfully extended to the Henry reactions.