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Showing papers on "Acetone published in 1997"


Journal ArticleDOI
TL;DR: In this article, the gas phase photocatalytic degradation of 17 VOCs over illuminated titanium dioxide was investigated using a plug flow reactor with the following experimental conditions: 200 ml min−1 flow rate, 23% relative humidity, 21% oxygen and an organic compound concentration range of 400-600 ppmv.
Abstract: The gas-phase photocatalytic destruction of 17 VOCs over illuminated titanium dioxide was investigated using a plug flow reactor with the following experimental conditions: 200 ml min−1 flow rate, 23% relative humidity, 21% oxygen and an organic compound concentration range of 400–600 ppmv. At steady state, high conversion yields were obtained for trichloroethylene (99.9%), isooctane (98.9%), acetone (98.5%), methanol (97.9%), methyl ethyl ketone (97.1%),t-butyl methyl ether (96.1%), dimethoxymethane (93.9%), methylene chloride (90.4%), methyl isopropyl ketone (88.5%), isopropanol (79.7%), chloroform (69.5%) and tetrachloroethylene (66.6%). However, the photodegradation of isopropylbenzene (30.3%), methyl chloroform (20.5%) and pyridine (15.8%) was not so efficient. Carbon tetrachloride photoreduction was investigated in the presence of methanol as an electron donor. It was observed that the presence of methanol results in higher degradation rates. No reaction byproducts were detected for all VOCs tested under the experimental set-up and conditions described. Also, long-term conversion was obtained for all tested compounds. Catalyst deactivation was detected with toluene only, but the activity was restored by illuminating the catalyst in the presence of hydrogen peroxide. The capacity of the process to destroy different classes of volatile organic compounds present in the atmosphere was demonstrated.

477 citations


Journal ArticleDOI
TL;DR: In this article, three chemical families were investigated to stabilize the viscosity of biocrude during long-term storage and showed the ability to drastically reduce the aging rate of bi-products.
Abstract: The initial development of additives to stabilize the viscosity of biocrude during long-term storage has produced dramatic results. The additives investigated were ethyl acetate, methyl isobutyl ketone and methanol, acetone, methanol, acetone and methanol, and ethanol. These additives represent three chemical families, which all demonstrated the ability to drastically reduce the aging rate of biocrude, as defined by the increase in viscosity with time. Accelerated aging tests were run at 90 °C to screen the additives. The additives not only lowered the initial viscosity at 40 °C by half but also reduced the aging rate of a hot gas filtered pyrolysis oil made from hybrid poplar (NREL run 175) by factors of 1−18 compared to the original pure oil. With the best additive, methanol, at a 10 wt % level in the pyrolysis oil, the modified biocrude was still a single-phase liquid and still met the ASTM No. 4 diesel fuel specification for viscosity even after 96 h exposure to 90 °C. Based on the aging rate at 90 °C...

371 citations


Journal ArticleDOI
TL;DR: In this paper, the P-x-y diagrams for carbon dioxide + methanol, carbon dioxide+ ethanol, and carbon dioxide plus acetone were determined by a novel technique of density measurement at 291, 298, 303, 308, 313 K, and pressures up to 8 MPa.

228 citations


Journal ArticleDOI
TL;DR: In this paper, a collection of the authors' recent results concerning the photocatalytic oxidation of gaseous organics and CO over TiO 2 in different kinds of reactors with the accent on providing quantitative information about the photoprocesses studied.

110 citations


Journal ArticleDOI
TL;DR: The NAD(P)H-dependent enzymatic activity within living Zygosaccharomyces rouxii was utilized to accomplish this reaction and the reaction was scaled-up to a volume of 300 l by utilizing a commercially available agitated filter as a reactor.

101 citations


Journal ArticleDOI
TL;DR: In this paper, the Dubinin−Radushkevich model was used to predict equilibrium adsorption capacities in the 100 ppbv to 10 ǫ000 ppmv concentration range.
Abstract: This research examined the use of activated carbon cloths (ACC) to remove low concentrations of acetaldehyde, acetone, benzene, and methyl ethyl ketone from air. This work has applications in producing filtration systems for indoor air environments, industrial gas streams, and spray paint booths. Adsorption isotherms were measured for volatile organic compound adsorbate concentrations in the 10−1000 ppmv range and for water vapor from 0 to 95% relative humidity. The Dubinin−Radushkevich model was used to predict equilibrium adsorption capacities in the 100 ppbv to 10 000 ppmv concentration range. The adsorption of acetone−benzene mixtures on ACC was experimentally measured and then modeled using ideal adsorbed solution theory.

89 citations


Journal ArticleDOI
TL;DR: In this paper, an analytical method is described that can detect the major alkyl ether compounds that are used as gasoline oxygenates (methyl tert-butyl ether, MTBE, ETBE, and tert-amyl methyl ether, TAME) in water at sub-ppb concentrations.
Abstract: An analytical method is described that can detect the major alkyl ether compounds that are used as gasoline oxygenates (methyl tert-butyl ether, MTBE; ethyl tert-butyl ether, ETBE; and tert-amyl methyl ether, TAME) and their most characteristic degradation products (tert-butyl alcohol, TBA; tert-butyl formate, TBF; and tert-amyl alcohol, TAA) in water at sub-ppb concentrations. The new method involves gas chromatography (GC) with direct aqueous injec tion (DAI) onto a polar column via a splitless injector, coupled with detection by mass spectrometry (MS). DAI-GC/MS gives excellent agreement with conventional purge-and-trap methods for MTBE over a wide range of environmentally relevant concentrations. The new method can also give simultaneous identification of polar compounds that might occur as degradation products of gasoline oxygenates, such as TBA, TBF, TAA, methyl acetate, and acetone. When the method was applied to effluent from a column microcosm prepared with core material from an urban site in New...

88 citations


Journal ArticleDOI
TL;DR: The rate of the reversible aldol condensation of acetone (Ac) to diacetone alcohol (DAA) catalysed by Amberlite IRA-900 anion exchange resin in the hydroxide form is measured in the liquid phase, without solvent, using batch and continuous reactors.

82 citations


Journal ArticleDOI
TL;DR: In this article, the aerobic biodegradation of volatile organic compound (VOC) mixtures from effluent air streams in laboratory-scale compost-based biofilters was described and 82% of the carbon in the influent pollutant (methyl ethyl ketone) was recovered as carbon dioxide in exhaust air after this period.
Abstract: The work describes the aerobic biodegradation of volatile organic compound (VOC) mixtures from effluent air streams in laboratory-scale compost based biofilters. A rapid start-up of the system (3–5 d) was observed and 82% of the carbon in the influent pollutant (methyl ethyl ketone) was recovered as carbon dioxide in the exhaust air after this period. Biofilter performance and carbon dioxide production were also investigated during and after 0.5–1-h step inputs of 2–10 g m−3 of hexane, acetone, 1-propanol, and/or methyl isobutyl ketone (MIBK) during steady methyl ethyl ketone (MEK) treatment. Carbon dioxide patterns suggest that pulsed pollutants were first sorbed onto the packing material and subsequently degraded within 2–5 h. Hexane was not sorbed, and thus not degraded to a significant extent. Little effect was observed of the step inputs on the overall MEK removal process, mainly because the reactors were operated well below MEK breakthrough loading. However, the analysis of MEK profiles within the b...

80 citations


Journal ArticleDOI
TL;DR: In this paper, the solubility of carbon dioxide in organic solvents acetone and propionic acid has been measured with an analytical method, and the composition and the density of the liquid phase in the binary vapor−liquid equilibrium have been investigated at (313 and 333) K (for the system carbon dioxide + acetone) and at (298, 313, and 333), at pressures up the binary critical pressure.
Abstract: The solubility of carbon dioxide in organic solvents acetone and propionic acid has been measured with an analytical method. The composition and the density of the liquid phase in the binary vapor−liquid equilibrium have been investigated at (313 and 333) K (for the system carbon dioxide + acetone) and at (298, 313, and 333) K (for the system carbon dioxide + propionic acid) at pressures up the binary critical pressure. The experimental results for the phase equilibrium have been correlated with the Peng−Robinson EOS applying several mixing rules.

73 citations


Journal ArticleDOI
TL;DR: In this paper, the thermal conductivity of 12 pure organic solvents, acetone, acetonitrile, acrylonitrile and carbon tetrachloride, chloroform, 1,2-dichloroethane, ethanol, ethyl acetate, heptane, tetrahydrofuran, toluene, and water, and eight binary mixtures, were measured by an absolute transient hot-wire method at some selected temperatures from 253.15 K to 303.15
Abstract: The thermal conductivity of 12 pure organic solvents, acetone, acetonitrile, acrylonitrile, carbon tetrachloride, chloroform, 1,2-dichloroethane, ethanol, ethyl acetate, heptane, tetrahydrofuran, toluene, and water, and eight binary mixtures, acetone + ethanol, acetone + ethyl acetate, ethanol + heptane, ethanol + carbon tetrachloride, ethyl acetate + ethanol, heptane + acetone, heptane + toluene, and water + ethanol, were measured by an absolute transient hot-wire method at some selected temperatures from 253.15 K to 303.15 K. A correlation previously developed was used to calculate the thermal conductivity. The agreement between the experimental and the calculated thermal conductivities is satisfactory.

Journal ArticleDOI
TL;DR: In this article, it is suggested that the reaction rates in propane and propene total oxidation can be influenced by the rate of oxidation of adsorbed======acetate and acrylate intermediates, respectively.
Abstract: Oxidation of the C 3 organic compounds propane, propene, acrolein, propan-2-ol and acetone has been investigated over three transition-metal oxide catalysts, Co 3 O 4 , MgCr 2 O 4 and CuO, in a flow reactor and using FTIR spectroscopy to study the adsorbed species. Co 3 O 4 and MgCr 2 O 4 are very active in propane and propene catalytic combustion. FTIR studies suggest that adsorbed isopropoxide species and adsorbed acetone and acetates are intermediates in propane oxidation while adsorbed acrolein and acrylates are intermediates in propene oxidation. Flow reactor studies support these hypotheses. It is suggested that the reaction rates in propane and propene total oxidation can be influenced, at low temperature, by the rate of oxidation of adsorbed acetate and acrylate intermediates, respectively. Co 3 O 4 and MgCr 2 O 4 are also active and quite selective catalysts for the oxy-dehydrogenation of propan-2-ol to acetone at low conversion, suggesting that the same oxygen species are involved in total and partial oxidation of organic compounds. CuO, as such, is not active in the adsorption and oxidation of C 3 hydrocarbons and oxygenates, at low temperature. At higher temperatures the reactants reduce the catalyst and catalytic activity starts. The oxidation state of the CuO x catalyst can be evaluated by IR studying the transmittance of the radiation upon different treatments.

Journal ArticleDOI
TL;DR: Molecular properties of the first bacterial acetone-metabolizing enzyme to be isolated are revealed and a novel mechanism of acetone carboxylation coupled to ATP hydrolysis and AMP and inorganic phosphate formation is suggested.
Abstract: Acetone metabolism in the aerobic bacterium Xanthobacter strain Py2 proceeds by a carboxylation reaction forming acetoacetate as the first detectable product. In this study, acetone carboxylase, the enzyme catalyzing this reaction, has been purified to homogeneity and characterized. Acetone carboxylase was comprised of three polypeptides with molecular weights of 85,300, 78,300, and 19,600 arranged in an α2β2γ2 quaternary structure. The carboxylation of acetone was coupled to the hydrolysis of ATP and formation of 1 mol AMP and 2 mol inorganic phosphate per mol acetoacetate formed. ADP was also formed during the course of acetone consumption, but only accumulated at low, substoichiometric levels (≈10% yield) relative to acetoacetate. Inorganic pyrophosphate could not be detected as an intermediate or product of acetone carboxylation. In the absence of CO2, acetone carboxylase catalyzed the acetone-dependent hydrolysis of ATP to form both ADP and AMP, with ADP accumulating to higher levels than AMP during the course of the assays. Acetone carboxylase did not have inorganic pyrophosphatase activity. Acetone carboxylase exhibited a Vmax for acetone carboxylation of 0.225 μmol acetoacetate formed min−1⋅mg−1 at 30°C and pH 7.6 and apparent Km values of 7.80 μM (acetone), 122 μM (ATP), and 4.17 mM (CO2 plus bicarbonate). These studies reveal molecular properties of the first bacterial acetone-metabolizing enzyme to be isolated and suggest a novel mechanism of acetone carboxylation coupled to ATP hydrolysis and AMP and inorganic phosphate formation.

Journal ArticleDOI
TL;DR: In this article, the effects of surface properties on the uptake of phenol by carbonaceous adsorbents and on subsequent regeneration by acetone leaching were investigated, and surface acidity was investigated as a factor contributing to the reversibility of as-received carbons.
Abstract: An investigation was made of the effects of surface properties on the uptake of phenol by carbonaceous adsorbents and on subsequent regeneration by acetone leaching. As-received carbons derived from different source materials were evaluated at pH values 2 and 9, and the surface properties of selected adsorbents were varied by surface oxidation with concentrated HNO3 and/or heat treatment under nitrogen. Carbons derived from different source materials exhibited similar total uptake and reversible (acetone extractable) uptake at pH 2 but exhibited a wide range of reversibility at pH 9, conditions that promote oxidative coupling reactions. Surface acidity was investigated as a factor contributing to the reversibility of as-received carbons, and surface oxidation was evaluated as a means of improving regenerability. Oxidation of coal- and wood-based adsorbents with concentrated HNO3 increased surface acidity as measured by Boehm titration techniques and reduced the uptake of phenol but increased the reversibl...

Journal ArticleDOI
TL;DR: In this paper, a comparison of the productive capacities of the various polyvinyl alcohol (PVA) crosslinked membrane has been conducted for the purpose of the separation of acetone/water and isopropanol (IPA)/water systems.
Abstract: Pervaporative separation of acetone/water and isopropanol (IPA)/water systems has been studied in the water-lean range of composition of the feed mixtures. Poly(vinyl alcohol) (PVA) membranes crosslinked with citric acid, adipic acid, maleic acid, glutaraldehyde, and glyoxal were used for this purpose. The sorption characteristics of all the membranes indicate that these membranes have a good sorption selectivity for water in view of the hydrophilic nature of PVA. The type of crosslinker used for crosslinking has been shown to have an important bearing on the permeation characteristics of the membranes. Thus, the trifunctional citric acid yields the highest selectivity but lowest flux. A comparison of the productive capacities of the various membranes indicates that the glutaraldehyde crosslinked membrane has the maximum productive capacity for IPA dehydration whereas maleic acid crosslinked membrane yields the highest productive capacity for acetone dehydration.

Patent
18 Mar 1997
TL;DR: In this article, the developers and strippers are disclosed for free radical-initiated, addition polymerizable resists, cationically cured resists and solder masks and Vacrel photoresists.
Abstract: Simple, environmentally friendly developers and strippers are disclosed for free radical-initiated, addition polymerizable resists, cationically cured resists and solder masks and Vacrel photoresists. In all cases both the developers and the strippers include gamma butyrolactone, propylene carbonate and benzyl alcohol, optionally also including a minor amount of methanol, ethanol, isopropyl alcohol, propylene glycol monomethylacetate, ethylene glycol monomethyl ether, formamide, nitromethane, propylene oxide, or methyl ethyl ketone, acetone and water.

Journal ArticleDOI
TL;DR: In this paper, the kinetics of the epoxidation of cis-stilbene were studied and which were shown to follow a simple second order rate law for all solvents studied.

Journal ArticleDOI
TL;DR: In this article, experimental data on methane hydrate formation in mixtures of water and acetone were presented, and the experimental data obtained were described by a model that takes into account the variation of the enthalpy of hydrate forming as a function of the pressure and the acetone concentration.
Abstract: In this article, experimental data on methane hydrate formation in mixtures of water and acetone are presented. For eight different acetone−water mixtures, the phase transition hydrate + liquid + vapor → liquid + vapor (HLV → LV) was determined in the pressure range 2.50 < p/MPa < 11.25. In addition, the experimental data obtained were described by a model that takes into account the variation of the enthalpy of hydrate formation as a function of pressure and acetone concentration. The average absolute temperature difference in the representation of the hydrate formation temperatures of methane in the presence of acetone is less than 0.32 K.

Journal ArticleDOI
TL;DR: In this paper, the transformation of acetone was carried out over a 04 wt% PtHMFI catalyst (SiAl = 60) under the following conditions: flow reactor, 160°C, pressures of hydrogen equal to 075 and 025 bar, respectively.
Abstract: The transformation of acetone was carried out over a 04 wt% PtHMFI catalyst (SiAl = 60) under the following conditions: flow reactor, 160°C, pressures of acetone and hydrogen equal to 075 and 025 bar, respectively Methylisobutylketone, propane and traces of mesityloxide are observed as primary products while the other main products: 2-methylpentane and diisobutylketone result from secondary transformation of methylisobutylketone The reactivity of the reaction products and of probable intermediates: diacetone alcohol, isopropanol and propene was compared to that of acetone, which allows us to establish the complete scheme of acetone transformation Acetone is competitively transformed through bifunctional catalysis into methylisobutylketone and into propane The limiting step of methylisobutylketone formation is acetone aldolisation over the acid sites of the catalyst while that of propane formation is acetone hydrogenation over platinum sites Methylisobutylketone undergoes the same competitive bifunctional transformations leading to diisobutylketone (limiting step: acid coaldolisation of acetone and of methylisobutylketone) and to 2-methylpentane (limiting step: hydrogenation of methylisobutylketone)

Journal ArticleDOI
TL;DR: In this article, a methyl isobutyl ketone (MIBK) was synthesized from acetone and hydrogen over Pt-HZSM5 bifunctional catalysts.
Abstract: Methyl isobutyl ketone (MIBK) was synthesized from acetone (Ac) and hydrogen over Pt-HZSM5 bifunctional catalysts. The reaction was carried out at 160°C, atmospheric pressure, and with a PH2/PAc molar ratio = 0.33, using a fixed bed and dynamic flow reactor. The results show that catalytic properties and coke formation largely depend on the ratio between the number of accessible hydro-dehydrogenation sites and the number of theoretical acidic sites (nPt/nA).

Journal ArticleDOI
TL;DR: In this paper, the reaction was monitored in situ by FT-infrared spectroscopy, and isopropyl hydroperoxide was detected as reaction intermediate in the case of photochemical oxidation.
Abstract: Oxidation of propane by O2 to acetone was observed in solvent-free BaY and CaY under irradiation with visible light as well as under dark thermal conditions. The reaction was monitored in situ by FT-infrared spectroscopy. In the case of the photochemical oxidation, isopropyl hydroperoxide was detected as reaction intermediate. No byproduct was observed even upon > 50% conversion of the alkane. Ethane was oxidized completely selectively to acetaldehyde in CaY under irradiation with blue light.

Journal ArticleDOI
TL;DR: In this paper, defect-free and La2O3-modified γ-Al 2O3 membranes were prepared for recovery of acetone from nitrogen by multilayer diffusion and capillary condensation mechanisms, and an optimum range for acetone permeance (∼8 × 10-7mol/m2·s·Pa) with respect to membrane temperature or feed composition was established.
Abstract: Defect-free γ-Al2O3 and La2O3-modified γ-Al2O3 membranes were prepared for recovery of acetone from nitrogen by multilayer diffusion and capillary condensation mechanisms. There existed an optimum range for acetone permeance (∼8 × 10-7mol/m2·s·Pa) and acetone−nitrogen separation factor (∼1000) with respect to membrane temperature or feed composition. Hysteresises of acetone permeability and separation factor were also found between desorption and adsorption. The La2O3-modified γ-Al2O3 membrane appears to be the most effective for use in the VOC recovery process as compared to polymeric, Vycor, and unmodified γ-Al2O3 membranes.

Journal ArticleDOI
TL;DR: An assay for acetone carboxylation is described, in which fixation of radiolabeled carbon dioxide from NaH14CO3 is measured in the presence of acetone, ATP, magnesium ions and acetyl-CoA.
Abstract: The photosynthetic bacterium Rhodobacter capsulatus is able to grow, in the presence of carbon dioxide, under anaerobic (photosynthetic) conditions with the solvents acetone or butanone as carbon source. The carboxylation of acetone to form acetoacetate is the most likely initial step in acetone metabolism. This paper describes an assay for acetone carboxylation, in which fixation of radiolabeled carbon dioxide from NaH14CO3 is measured in the presence of acetone, ATP, magnesium ions and acetyl-CoA. Acetone carboxylase activity was specifically induced by growth of R. capsulatus on acetone or butanone and was associated with a high-molecular-mass protein complex containing two major polypeptides, of 70 and 85 kDa. Partial purification of the activity was achieved by FPLC ion-exchange chromatography, which confirmed that the 70 and 85 kDa proteins were subunits of the enzyme and suggested that at least one additional protein (60 kDa) may be associated with carboxylase activity. N-terminal sequences of the two major subunits were not significantly similar to any other carboxylases in the databases and neither contained covalently bound biotin, indicating that the enzyme represents a novel type of carboxylase. Acetone carboxylase activity was also demonstrated in cell-free extracts of acetone-grown Rhodomicrobium vannielii and the denitrifying bacterium Thiosphaera pantotropha.

Journal ArticleDOI
01 Nov 1997-Polymer
TL;DR: In this paper, a gravimetric-sorption method was used to obtain VLE data for polystyrene + chloroform + carbon tetrachloride for seven binary polymer + solvent systems and for one ternary polymer + mixed solvent system.

Patent
19 Sep 1997
TL;DR: In this paper, a brightness stabilization mixture of water-soluble organic compounds from biomass pyrolysis oils is produced by using a mixture of solvent-solvable organic compounds.
Abstract: A process for producing a brightness stabilization mixture of water-soluble organic compounds from biomass pyrolysis oils comprising: a) size-reducing biomass material and pyrolyzing the size-reduced biomass material in a fluidized bed reactor; b) separating a char/ash component while maintaining char-pot temperatures to avoid condensation of pyrolysis vapors; c) condensing pyrolysis gases and vapors, and recovering pyrolysis oils by mixing the oils with acetone to obtain an oil-acetone mixture; d) evaporating acetone and recovering pyrolysis oils; e) extracting the pyrolysis oils with water to obtain a water extract; f) slurrying the water extract with carbon while stirring, and filtering the slurry to obtain a colorless filtrate; g) cooling the solution and stabilizing the solution against thermally-induced gelling and solidification by extraction with ethyl acetate to form an aqueous phase lower layer and an organic phase upper layer; h) discarding the upper organic layer and extracting the aqueous layer with ethyl acetate, and discarding the ethyl acetate fraction to obtain a brown-colored solution not susceptible to gelling or solidification upon heating; i) heating the solution to distill off water and other light components and concentrating a bottoms fraction comprising hydroxyacetaldehyde and other non-volatile components having high boiling points; and j) decolorizing the stabilized brown solution with activated carbon to obtain a colorless solution.

Journal Article
TL;DR: In this article, the complete oxidation of diethyl ether vapors to carbon dioxide was studied and an efficient quantum yield of complete oxidation based on electron transferred and the light incident on the photocatalyst were ∼9%.
Abstract: The heterogeneous reaction of acetone, ethanol, and diethyl ether vapors with air proceeding at room temperature over honeycomb supported TiO 2 under the action of mild UV light results in the complete oxidation of these compounds to carbon dioxide. Intermediate gaseous products of diethyl ether oxidation are acetaldehyde and ethyl acetate. Acetaldehyde is an intermediate in ethanol oxidation. Efficient quantum yields of complete oxidation based on electron transferred and the light incident on the photocatalyst are ∼9%.

Journal ArticleDOI
TL;DR: The dioxirane oxidation pathway appears to be virtually exclusive one in this system in which only 5 equiv of ketone are used, and one example for the nonaqueous in situ generation of dimethyldoxirane is given.
Abstract: The reaction of ketones (acetone, 1,1,1-trifluoropropan-2-one) with the oxidation system (arenesulfonyl)imidazole (2)/H(2)O(2)/NaOH permits the in situ generation of the corresponding dimethyl- and methyl(trifluoromethyl)dioxirane in various solvents. This has been established by the chemoselective oxidation of azomethines 6, the diastereoselective oxidation of cholesterol (12), and (18)O-labeling experiments. Because only 5 equiv of ketone are used, the dioxirane oxidation pathway appears to be virtually exclusive one in this system. One example for the nonaqueous in situ generation of dimethyldioxirane (1a) is given.

Journal ArticleDOI
TL;DR: It is demonstrated that the o-quinone compounds formed from o-diphenols by PPO rapidly reacted with methylmercaptan, and the oxidation reaction of PPs by using acetone powder containing PPO or peroxidase is considered to be more effective for removing bad smells from the authors' mouths and from the environment.
Abstract: A mixture of purified polyphenol oxidases (PPO), or acetone powders prepared from fruits and vegetables, and polyphenolic compounds (PPs) totally eliminated a methylmercaptan odor. 2-Methyl-thiochlorogenic acid was isolated from the reaction mixture of methylmercaptan and chlorogenic acid with burdock acetone powder. Further, the formation of 5-methylthiochlorogenic acid and 2,5-bis(methylthio)-chlorogenic acid was suggested. These facts demonstrate that the o-quinone compounds formed from o-diphenols by PPO rapidly reacted with methylmercaptan. The oxidation reaction of PPs by using acetone powder containing PPO or peroxidase is considered to be more effective for removing bad smells from our mouths and from the environment.


Journal ArticleDOI
TL;DR: In this article, the transformation products of benzylidene acetone formed during zinc electrodeposition in solutions containing a nonionic surfactant and/or carboxylic acid were determined by IR and 1H NMR-spectra after extraction and chromatographic separation.
Abstract: The transformation products of benzylidene acetone formed during zinc electrodeposition in solutions containing a nonionic surfactant and/or carboxylic acid were determined by IR and 1H NMR-spectra after extraction and chromatographic separation. 1-Phenylbutanone-3, 1-phenylbutanole-3 and 1-phenylbutane were cathodic reaction products. Benzaldehyde, acetone, benzyl alcohol and benzoic acid were chemical reaction products in the cathodic layer. The nonionic surfactant increased the solubility of benzylidene acetone and carboxylic acid. This effect is probably caused by hydrophobic interaction and formation of associates. The associates cover a larger area of the cathodic surface than unsaturated ketone and/or carboxylic acid alone. It is supposed that a synergistic effect of additive mixtures on zinc electrodeposition may be caused by the formation of associates.