Showing papers on "Methyl isobutyl ketone published in 2001"
TL;DR: In this paper, a mixed solvent system consisting of tributyl phosphate (TBP) and methyl isobutyl ketone (MIBK) was used to extract high purity iron(III) chloride from waste chloride liquors of titanium minerals processing industry.
76 citations
TL;DR: Pd/Mg(Al)O samples were evaluated in the gas phase reaction of acetone with hydrogen to methyl isobutyl ketone (MIBK) as mentioned in this paper.
Abstract: Pd/Mg(Al)O samples (0.05 < Pd < 0.5 wt%) were evaluated in the gas phase reaction of acetone with hydrogen to methyl isobutyl ketone (MIBK). The catalysts were prepared by impregnating a calcined Mg–Al layered double hydroxide with Pd acetylacetonate in toluene solution. The highest selectivity to MIBK was achieved with ca. 0.2 wt% Pd and size of Pd particles of ca. 3–5 nm.
76 citations
TL;DR: In this article, surface-phase oxides of niobia on silica substrate ((Nb2O5/SiO2), NS(x)) were used as supports for palladium catalysts for the synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen in liquid phase.
Abstract: The surface-phase oxides of niobia on silica substrate ((Nb2O5/SiO2), NS(x)) were prepared and characterized. Such oxides were used as supports for palladium catalysts. The one-step synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen in liquid phase was also investigated over Pd/NS(x) catalysts. Experimental results indicate that these catalysts were effective for the formation of MIBK; since little of the parallel by-product of isopropanol (IPA) was formed, these catalysts reached selectivities of 88–92% MIBK and 2–3% IPA at 30–35% conversion. The reactivity of Pd/NS(x) declined obviously with an increase of water content that accumulated in a semi-batch reaction system. The water could be partially expelled and the deactivation of catalysts could be improved by using a fixed bed continuous flow reaction system.
52 citations
TL;DR: In this paper, the extractive separation of niobium and tantalum from the acid media using methyl isobutyl ketone (MIBK) as an extractant was studied.
Abstract: The niobium–tantalum ore material obtained from Ras Baroud locality in the central Eastern Desert of Egypt, consists mainly of two minerals namely: columbite and alvarolite. The extractive separation of niobium(V) and tantalum(V) from the acid media HF–HNO3 or HF–H2SO4 have been worked out using methyl isobutyl ketone (MIBK) as an extractant.
39 citations
TL;DR: The pharmaceutical compound (2R,3S)-2-([(1R)-1-[3,5-bis(trifluoromethyl)phenyl]ethyl]oxy)-3-(4-fluorophenyl)morpholine hydrochloride (denoted here as Compound X), has been found to crystallize in at least two polymorphic forms.
24 citations
TL;DR: Toluene was identified as the most frequently used solvent in solvent works in Korean manufacture industries in the late 1990s.
Abstract: Objectives: To identify the most popular solvent and typical type of solvent work among solvent-using workplaces in Korea. Methods: In practice, 862 solvent-using workshops in Sinpyeong-Jangrim industrial complex in Pusan were investigated in a 2-year period from March 1995 to February 1997. Solvent vapors in the breathing zone of workers were collected by personal sampling with charcoal tubes. The exposed charcoal was extracted with carbon disulfide, and the solvents in the extract were analyzed by flame ionization detector-equipped gas chromatography (FID-GC). Results: Solvents were used in painting, glue application, cleaning, printing and solvent-mixing workshops in decreasing order of popularity. Toluene was the most frequently measured solvent. In the five types of solvent work, acetone, hexane, methyl ethyl ketone, methyl isobutyl ketone, tetrachloroethylene, trichloroethylene and xylenes were also used frequently. Conclusions: Toluene was identified as the most frequently used solvent in solvent works in Korean manufacture industries in the late 1990s. Eight types of solvent were popularly used in five popular types of solvent work. These trends are very similar to the cases reported for industries in Japan.
21 citations
TL;DR: In this paper, a solvent extraction separation method for the determination of gold in real samples was developed, which involves selective and quantitative extraction of gold by N-n-octylaniline, a high molecular weight amine (HMWA), in xylene from aqueous sodium malonate medium at pH 1.0.
Abstract: A novel solvent extraction separation method has been developed for the determination of gold in real samples. It involves selective and quantitative extraction of gold by N-n-octylaniline, a high molecular weight amine (HMWA), in xylene from aqueous sodium malonate medium at pH 1.0. The effects of concentration of malonate, extractant, metal ion, and pH and of various diluents, stripping agents and other substances on the quantitative extraction of gold have been assessed. The applicability of the method to binary mixtures, synthetic mixtures, alloys and pharmaceutical samples is discussed.
21 citations
TL;DR: In this article, the potential of a new adsorptive material, poly(octadecyl diitaconate) (PDI-18), for the preconcentration of cadmium traces was assessed.
19 citations
TL;DR: In this article, an effect of addition of various amines such as di-ethylamine (DEA), Tri-N-CYCL, Tri-TEA, and tri-n-Octylamine(TOA) to organic phase could increase the extraction performance due to increasing partition coefficient.
Abstract: The organic solvent with a high partition coefficient toward acid extraction must be selected to increase the efficiency of extraction of acetic acid in aqueous phase. Amine extractant plays a major role in the reactive extraction process at the interface between aqueous phase/organic phases. Therefore, it has been investigated that an effect of addition of various amines such as di-ethylamine (DEA), tri-ethylamine (TEA), and tri-n-octylamine (TOA) to organic phase could increase the extraction performance due to increasing partition coefficient. The effect of temperature with TOA content of 0 to 40 wt-% on extraction process of acetic acid was observed. The removal efficiency of acetic acid in aqueous phase increased with temperature. However, the maximum value of extraction performance was different according to experimental conditions, such as the choice of organic solvent, temperature, and TOA content. In the case of methyl isobutyl ketone (MIBK)/TOA system and chloroform/ TOA used in organic phases, ...
17 citations
Patent•
11 Sep 2001
TL;DR: In this paper, a process for producing methyl isobutyl ketone (MIBK) is described, where some of the acetone is converted to mesityl alcohol (MSO), water and, optionally, diacetone alcohol (DAA) and other by-products.
Abstract: A process for producing methyl isobutyl ketone includes introducing acetone into a catalytic distillation. Some of the acetone is converted to mesityl alcohol (‘MSO’), water and, optionally, diacetone alcohol (‘DAA’) and/or other by-products. A product stream comprising MSO, water, and, optionally, DAA, other by-products and/or unreacted acetone is withdrawn from the catalytic distillation zone. When the product stream includes DAA, other by-products and/or unreacted acetone, it is treated in a treatment zone to remove at least some of the DAA, other by-products and/or the unreacted acetone therefrom. The product stream and hydrogen are fed into a reaction zone in which MSO present in the product stream and hydrogen react to form methyl isobutyl ketone (‘MIBK’). A MIBK rich product stream is withdrawn from this reaction zone.
16 citations
18 Oct 2001
TL;DR: Methyl isobutyl ketone (MIBK) is an industrially important solvent and chemical intermediate, which after methyl methacrylate and bisphenol A is the third largest tonnage product obtained from acetone as mentioned in this paper.
Abstract: Methyl isobutyl ketone (MIBK) is an industrially important solvent and chemical intermediate, which after methyl methacrylate and bisphenol A is the third largest tonnage product obtained from acetone MIBK is produced by four different routes: a three-step process via diacetone alcohol and mesityl oxide intermediates; a one-step process from acetone and hydrogen; a one-step process from isopropyl alcohol; and a single or multistep mixed feed process MIBK is generally considered to exhibit low mammalian toxicity However, MIBK must be handled with adequate ventilation Its vapor is heavier than air and can travel a considerable distance to a source of ignition The major use of MIBK is as a solvent for surface coatings It is also used in a variety of nonsurface-coating applications As a raw material it is used in the manufacture of rubber antiozonants
Keywords:
methyl isobuty ketone;
acetone;
solvents;
antiozonants;
mesityl oxide
TL;DR: A mixed matrix modifier of nickel and strontium nitrates was used as a chemical modifier for the determination of selenium in wines by Zeeman electrothermal atomic absorption spectrometry, and the optimum modifier mass established is markedly lower than those presented in the literature.
Abstract: A mixed matrix modifier of nickel and strontium nitrates was used as a chemical modifier for the determination of selenium in wines by Zeeman electrothermal atomic absorption spectrometry. Wine samples were heated on a boiling water bath with small amounts of nitric acid and hydrogen peroxide. For complete elimination of interference, especially from sulfates and phosphates, selenium is complexed with ammonium pyrolidinedithiocarbamate (APDTC), extracted into methyl isobutyl ketone (MIBK), and measured by ETAAS.
31 May 2001-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: The catalytic properties of the powders were tested in the dehydrogenation of 2-propanol and in the one-step synthesis of methyl isobutyl ketone (MIBK) from acetone as mentioned in this paper.
Abstract: Cu 15 Mg 85 and Cu 3 Mg 97 alloy powders, prepared by mechanical alloying of the constituent elements and Cu 78 Mg 22 and Cu 14.5 Mg 85.5 ribbons made by rapid quenching were characterized by physical methods (DSC, XRD, and XPS). Carbon and oxygen impurities and Mg (mainly as oxide) were detected by XPS of the as-received samples, and only the Cu 78 Mg 22 ribbon was shown to have copper on the surface. The powders, in turn, are the only samples possessing Cu 0 measured by the N 2 O titration method. The catalytic properties of the specimens were tested in the dehydrogenation of 2-propanol and in the one-step synthesis of methyl isobutyl ketone (MIBK) from acetone. The Cu 15 Mg 85 powder, is the only alloy exhibiting satisfactory catalytic performance: MIBK could be isolated in a yield of 35%. The data indicate that copper species determined by N 2 O titration are involved in the catalytic reactions.
TL;DR: In this paper, a method for the determination of trace amounts of niobium in steel samples by reversed-phase high-performance liquid chromatography (RP-HPLC) was developed.
Journal Article•
TL;DR: The solvent extraction of divalent metals from sulfate medium has not been studied widely because of its complexity as mentioned in this paper, however, this medium remains very important from a practical point of view, and metallic extractions undertaken from sulfuric acid solution are preferred in industrial applications.
Abstract: The solvent extraction of metals from sulfate medium has not been studied widely because of its complexity. However, this medium remains very important from a practical point of view, and metallic extractions undertaken from sulfuric acid solution are preferred in industrial applications. The extraction of divalent metals M by the acid extractants (HL) such as the β−diketones has been studied extensively2−4. It is generally described by the following equation:
Patent•
15 Jun 2001
TL;DR: A method for optical resolution of (±)-6-hydroxy-2,5,7,8-tetramethylcoumarone-2-carboxylic acid with optically active α-phenylethylamine was proposed in this article.
Abstract: A method for optical resolution of (±)-6-hydroxy-2,5,7,8-tetramethylcoumarone-2-carboxylic acid into (+)- and (-)-6-hydroxy-2,5,7,8-tetramethylcoumarone-2-carboxylic acids, characterized by reacting (±)-6-hydroxy-2,5,7,8- tetramethylcoumarone-2-carboxylic acid with optically active α-phenylethylamine in a solvent consisting of 2-propanol and/or methyl isobutyl ketone and cooling the obtained reaction mixture to deposit crystals of a diastereomeric salt corresponding to (+)- or (-)-6-hydroxy-2,5,7,8-tetramethylcoumarone-2-carboxylic acid.
TL;DR: In this article, the authors present extraction equilibria for reversible complexation of L-phenylalanine by the liquid ion-exchange extractants, Aliquat 336 and di-2-(ethylhexyl) phosphoric acid (DEHPA), in the diluent, methyl isobutyl ketone.
Abstract: Extraction equilibria are presented for reversible complexation of L-phenylalanine by the liquid ion-exchange extractants, Aliquat 336 and di-2-(ethylhexyl) phosphoric acid (DEHPA), in the diluent, methyl isobutyl ketone. Results are compared for extraction by each of the single extractants and a mixed extractant system composed of equimolar amounts of Aliquat 336 and DEHPA. The mixed system displayed lower loading values by a factor of 3 than the single-extractant systems; however, it was able to sustain uptake capacity for pH values 1.8 to 9.2. A simple complexation model, based on the Law of Mass Action, was employed to describe the experimental results.
TL;DR: In this article, CaO-C catalysts were prepared by precipitating calcium acetate with citric acid for 4 h in an aqueous solution at 80°C followed by reduction at 500-700°C.
Abstract: CaO-C catalysts were prepared by precipitating calcium acetate with citric acid for 4 h in an aqueous solution at 80°C followed by reduction at 500-700°C. The resultant average pore radius and BET surface area of CaO-C, CaO crystallite size, and carbon content in CaO-C were about 1.5-2.5 nm, 170-200 m2/g, 11.2 nm, and 10-20%, respectively. These values suggest that the highly dispersed CaO-C catalyst forms mainly due to the residual carbon acting as a spacer. 4 wt% Ni/CaO-C reduced at 700°C was used for one step synthesis of methyl isobutyl ketone (MIBK) from acetone. 60-70% of acetone overall conversion and 70% of MIBK selectivity are obtained which are much higher than those ever reported. The diisobutyl ketone (DIBK) selectivity decreases drastically because of the remaining carbon which blocks DIBK formation sites.
Patent•
04 Apr 2001
TL;DR: In this article, a process for synthesizing methyl isobutyl ketone (MIBK) from acetone and hydrogen uses Pd/Al2O3 as catalyst which has been presulfurized at 100-160 deg.C and 2-5 MPa with the sulfurized rate of 30-70 mol% of Pd content.
Abstract: A process for synthesizing methyl isobutyl ketone (MIBK) from acetone and hydrogen uses Pd/Al2O3 as catalyst which has been presulfurized at 100-160 deg.C and 2-5 MPa with the sulfurized rate of 30-70 mol% of Pd content. The synthesis reaction occurs at 140-200 deg.C and 4-9 MPa. Its advantages include high tranform rate and seletivity and low cost.
Patent•
06 Apr 2001
TL;DR: In this paper, a composition of photochromic accessory coating and painting agents and a method for preparing the same are provided by which prepared accessory has various aesthetic effects depending on ultraviolet rays.
Abstract: PURPOSE: A composition of photochromic accessory coating and painting agents and a method for preparing the same are provided by which prepared accessory has various aesthetic effects depending on ultraviolet rays. CONSTITUTION: The composition of photochromic accessory coating and painting agents comprises; (i) 20-30 wt.% of resin; (ii) 1-3 wt.% of camper; (iii) 4-6 wt.% of di-butyl phthalate; (iv) 4-6 wt.% of ethyl acetate; (v) 12-18 wt.% of toluene; (vi) 12-18 wt.% of butyl acetate; (vii) 4-6 wt.% of isopropyl alcohol; (viii) 10-12 wt.% of cellulose acetate butylate; (ix) 0.1-0.3 wt.% of polyethylene wax; (x) 8-12 wt.% of methyl isobutyl ketone; (xi) 10-15 wt.% of methyl isoehtyl ketone; and (xii) 0.5-2 wt.% of photochromic compound. The method comprises steps of: (i) preparing a resin solution by adding acetate to a mixture obtained by mixing resin, camper, di-butyl phthalate, cellulose acetate butylate, ethyl acetate and toluene and then stirring with high speed; and (ii) gradually adding photochromic compound solution obtained by mixing photochromic compound, isopropyl alcohol, polyethylene wax, methyl isobutyl ketone and methyl isoethyl ketone to the solution of the step (i) and then stirring.
Patent•
15 May 2001
TL;DR: In this paper, the problem of inferior solvent resistance and heat resistance owing to the lack of heat resistance of a hollow minute particle, and limitation of its use because of its poor adhesion to a resinous printing surface such as a PET film was solved.
Abstract: PROBLEM TO BE SOLVED: To provide an ink composition for an inkjet, solving the problem of inferior solvent resistance and heat resistance owing to the solubility to an organic solvent and the lack of heat resistance of a hollow minute particle, and limitation of its use because of its poor adhesion to a resinous printing surface such as a PET film owing to its solvency to an organic solvent and use of an aqueous solvent. SOLUTION: This ink composition for an inkjet comprises 2-20 wt.% (of the total weight) resin, 5-25 wt.% hollow minute ball, 0.05-5 wt.% electric charge regulator, and a ketone having a boiling point of 55-120 deg.C or a dispersion solvent comprising at least a ketone having a boiling point of 55-120 deg.C and an alcohol having a boiling point of 55-120 deg.C, has a methyl isobutyl ketone content of 60% or more, and uses the hollow minute particle having an outer diameter of 0.2-1 μm, and the ratio of the inner diameter to outer diameter of 0.4 or greater.
TL;DR: In this paper, a self-sustaining reaction between Mg and PdO, and two Pd-Mg bicomponent alloys by mechanochemical synthesis induced by ball milling were characterized.
Abstract: We have prepared a Pd-MgO sample by self-sustaining reaction between Mg and PdO, and two Pd-Mg bicomponent alloys by mechanochemical synthesis induced by ball milling They were characterized by XRD, DSC and XPS techniques Further characterization was carried out following controlled oxidation which was necessary to enhance the catalytic performance in the synthesis of methyl isobutyl ketone. Complex transformations characterized in most cases by he formation of Pd-Mg intermetallics are observed by XRD. A common feature of all samples is the surprisingly low concentration of the metallic components due to oxygen and carbon impurities and the lack of palladium on the surface High catalytic activities were achieved in catalytic studies but overhydrogenation due to the high hydrogenating ability of Pd resulted in decreased selectivities.
TL;DR: In this article, the authors used Centaur™ activated carbon for the production of sulfuric acid as a concentrated acid or at any desired dilution at ambient temperature and pressure for a humidified SO 2 and O 2 stream using a trickle-bed reactor flushed with a solvent such as acetone or ethyl ether.
Abstract: Production of sulfuric acid as a concentrated acid or at any desired dilution can be carried out at ambient temperature and pressure for a humidified SO 2 and O 2 stream using a trickle-bed reactor flushed with a solvent such as acetone or ethyl ether. Activity of the carbon catalyst in a methyl ethyl ketone washed trickle bed is about 100 times the activity of conventional vanadia catalysts operating at 350 to 400 °C. Measurements of removal, conversion to acid and productivity of the catalyst in g of H 2 SO 4 /g carbon•h were done using moderately polar organic solvents — acetone, methyl ethyl ketone (MEK), and methyl isobutyl ketone (MIBK) — as well as water as the flushing liquids for the oxidation of SO 2 to sulfuric acid in a trickle-bed reactor containing a structured packing coated with Centaur™ activated carbon. SO 2 removal from the gas sent to the trickle bed reached 95% and conversion to acid based on SO 2 fed attained 94% under some operating conditions. Productivity was measured at 2.9 g of H 2 SO 4 /g carbon•h with 6 vol% SO 2 in the gas feed. Pressure was ambient and temperatures ranged from 18 to 21 °C in all experiments. MEK and MIBK undergo reaction as batch distillation proceeds, but otherwise 98% solvent recovery was achieved.
Journal Article•
TL;DR: In this article, the effects of methyl isobutyl ketone (MIBK)/ethanol(EtOH) solvent mixtures on the dispension, particle size distribution and rheology of O/ZrO nonaqueous suspensions were investigated by measuring sedimentation density and viscosity.
Abstract: The effects of methyl isobutyl ketone(MIBK)/ethanol(EtOH) solvent mixtures on the dispension, particle size distribution and rheology of O/ZrO nonaqueous suspensions were investigated by measuring sedimentation density and viscosity. The sedimentation density of O and ZrO particles increased in MIBK-rich(60 vol%) solvents with 'Hypermer' KD-1 as a dispersant. The ball-milled suspensions in 80MIBK/20EtOH(vol%) solvent exhibited the narrow and unimodal particle size distribution. Although all Suspensions exhibited the Pseduo-Plastic flow(Shear thinning) the shear thinning behavior was somewhat different depending on the mixture ratio of O/ZrO and MIBK/EtOH. Under a given shear rate( for O; for ZrO) the strongest shear thinning appeared in the O and ZrO suspensions with pure MIBK solvent. The shear thinning was nearly independable on the mixture ratio of O/ZrO in case of using the identical solvent(80MIBK/20EtOH, vol%).
Journal Article•
TL;DR: In this article, a new method for extracti on chromatographic separation of zinc (II) was developed with Trioctylphosphine oxide as the stationary phase and nitric acid as mobile phase on silica gel as stationary support.
Abstract: A new method for extracti on chromatographic separation of zinc (II) was developed with Trioctylphosphine oxide as the stationary phase and nitric acid as mobile phase on silica gel as stationary support. Zinc was extracted from 2.5 M hydrochloric acid and then stripped with 4 M nitric acid and determined spectrophotometrically at 460 nm by murexide method. Zinc was separated from alkali, alkaline earths, chromium, iron, cobalt, nickel, cadmium, mercury, lead, trivalent rare earths, platinum group metals from binary mixtures by selective extraction of zinc. Zinc is also separated from multicomponent mixtures. The method was extended for the analysis of zinc in alloys and industri al sample. Reversed-phase extraction chromatography (RPEC) is an extremely versatile technique and has been applied successfully to the separation of various metals and organic compounds 1 • 2 • In RPEC trioctylphosphine oxide (TOPO) has been extensively used for the extraction chromatographic separation of many metal ions including zinc 3 . Attempts have been made to separate zinc from associated elements by RPEC with tributyl phosphate (TBP) 4 ' 5 , Isooctyl thioglycolate (IOTG) 6 , Methyl isobutyl ketone (MIBK/, Di-(2ethylhexyl)orthophosphoric acid (HDEHPf This paper describes systematic investigation of the extraction chromatographic separation of zinc on a silica-gel column with trioctylphosphine oxide as the stationary phase. Methods are presented for the separation of zinc from a large number of elements in multi-component mixtures. The method has been extended to the determination of zinc in real samples.