Showing papers on "Hexane published in 1986"
TL;DR: In this article, the excess molar volumes of n-hexane+n-undecane were determined from density measurements at 288.15, 293.15 K, 298.15K, 303.15k, and 308.15 k using an Anton Paar densimeter.
Abstract: Excess molar volumes of n-hexane+n-undecane have been determined from density measurements at 288.15, 293.15, 298.15, 303.15, and 308.15 K. The densities were obtained with an Anton Paar densimeter. The minimum values of V m E for the systems n-hexane, n-heptane, n-octane, and n-nonane+n-undecane are plotted against temperature
35 citations
TL;DR: Precipitated n-butylpotassium (BuK), prepared by metal exchange between n-butyllithium and potassium-t-amylate, dissolves in hexane after addition of N, N, N ', N '-tetramethylethylenediamine (TMEDA) as discussed by the authors.
34 citations
TL;DR: In this paper, various adsorbates (water, hexane, and benzene) applied to several kinds of zeolites (Y, mordenite, and ZSM-5) were evaluated as a method of measuring the eternal surface areas.
34 citations
TL;DR: In this article, the same authors compared the results of a limited amount of hexane to a larger amount of conventional hexane and found that the distribution of phospholipid components remained essentially the same.
Abstract: Soybean flakes were extracted with lower than optimal quantities of hexane in the laboratory and comparisons were made of oil yield, phospholipids yield and phospholipids composition as a function of the volume of hexane. Although the oil yield and the total amount of phosphorus were significantly decreased with limited volumes of hexane, the distribution of phospholipid components remained essentially the same. Because the oil obtained by this limited solvent extraction contained less phosphatides, it is expected to be more easily processed by conventional techniques.
32 citations
TL;DR: A two-phase solvent extraction system was developed for the treatment of rapeseed (canola) as discussed by the authors, which consisted of a lower alkanol containing 0-14% (w/w) of ammonia and 0-15% (v/v) of water.
Abstract: A new two-phase solvent extraction system was developed for the treatment of rapeseed (canola). The polar phase consisted of a lower alkanol containing 0-14% (w/w) of ammonia and 0-15% (v/v) of water. The non-polar phase was hexane. Of the alkanols, methanol was the most effective, followed by ethanol. Isopropanol and t-butanol were of limited usefulness. Methanol containing 5% water (v/v) and 10% ammonia (w/w) gave the best overall results at a solvent-to-seed (R) ratio of 6.7 (v/w) and a blending time of 2 min, followed by a quiescent period of 15 min. At this point hexane was added (R = 6.7) and the mixture stirred vigorously. The phases were separated by usual means. The hexane phase contained 79-89% of the oil present in the original seed. More oil could be extracted from the meal and the methanol phase. The oil-free meal was light in colour and bland in flavour. Its glucosinolate content was below the detection level of the analytical method employed.
31 citations
Patent•
27 Nov 1986
TL;DR: In this paper, a.omega.3-concentrate is produced through urea precipitation of the non-omega-3-fatty acid alkyl esters so that the filtrate from the pre-cipitation may be extracted by means of hexane for the transmission of the.OMEga.
Abstract: Refining of fish waste product so that a concentrate of .omega.3-fatty acid alkyl ester is formed with 20-30% eicosa-pentaenoic acid alkyl ester and 35-50% docosahexaenoic acid alkyl ester (both by weight) free from cholesterol. The .omega.3-concentrate is produced through urea precipitation of the non- .omega.3-fatty acid esters so that the filtrate from the pre-cipitation may be extracted by means of hexane for the trans-mission of the .omega.3-fatty acid esters and the cholesterol to the hexane extract, Hexane is thereafter removed. The remaining concentrate of the fatty acid esters with the chol-esterol is cooled to a temperature of not lower than -50°C, whereby the cholesterol is crystallized. The remainder is a .omega.3-concentrate with the composition mentioned above.
31 citations
TL;DR: In this paper, a photo-ionization cell consisting of a quartz cuvette and a pair of stainless steel electrodes is described for the detection of the two-photon ionization signal in solution.
28 citations
24 citations
TL;DR: In this paper, flow-calorimetric measurements of excess enthalpies and successive-dilution dilatometric measurements were reported for (methyl methacrylate + n-hexane) at 298.15 K.
23 citations
TL;DR: In this paper, the self-diffusion coefficients of n-butane, n-pentane and 2-butyne were determined in the liquid state by NM R-techniques at pressure up to 200 MPa and temperatures up to 450 K.
Abstract: The pressure and temperature dependence o f the self-diffusion coefficients D of n-butane, n-pentane, n-hexane, n-decane, trans-2-butene, cis-2-butene and 2-butyne were determined in the liquid state by NM R-techniques at pressure up to 200 MPa and temperatures up to 450 K. The results are taken as tests for the various dynamical models and compared to results obtained by M D calculations. The activation parameters for translational transport and the parameters for the RHS-m odel are derived and discussed.
22 citations
TL;DR: The association constants for different conglomerates of the methanol/ n-hexane system were calculated at 303 K from a new i.r. spectra method as discussed by the authors. But the association constants were not applied to polymers.
TL;DR: The reaction of dihydrofulvalene with TlOEt in Et 2 O/hexane has given n fulvalenedithallium as an air-sensitive but thermally stable solid as mentioned in this paper.
TL;DR: In this article, the HPO emission at 528 nm in a H2/N2 flame was used to determine the presence of organophosphorus insecticides with hexane/dichloromethane at pH 2.
TL;DR: In this paper, flash vacuum pyrolysis and matrix-isolation studies of 6-bromo-6-(trimethylstannyl)bicyclo[3.1.0]hexane (1) gave evidence for the formation of 1,2-c.yclohexadiene (2 ) from this precursor.
TL;DR: In this article, the adsorption properties of AlPO4-5 samples have been studied by kinetic and equilibrium measurements using hydrocarbons and water as adsorbates, and a non-polar su
Abstract: The adsorption properties of AlPO4-5 samples have been studied by kinetic and equilibrium measurements using hydrocarbons and water as adsorbates. From the adsorption of hydrocarbons a non-polar su...
TL;DR: In this paper, a reaction was carried out in a medium of the organic nitrile in a sealed glass ampul at 180~ for 12 h. The melting point of (I) was 40-41~ [i], while the boiling point was I00I02~ (2 mm) [2].
Abstract: This reaction was carried out in a medium of the organic nitrile in a sealed glass ampul at 180~ for 12 h. After removal of the excess nitrile, the product was extracted with hexane and purified by thin-layer chromatography on silica gel using 2:1 benzene-hexane as the eluent. The melting point of (I) was 40-41~ [i], while the boiling point of (II) was I00I02~ (2 mm) [2]. The structures of (I) and (II) were supported by their IR and PMR spectra.
TL;DR: In this paper, the separation and retention behavior of some aliphatic amines in ligand-exchange liquid chromatography has been studied using copper(II)-modified bonded silica gels as the stationary phase.
TL;DR: In this article, the authors measured liquid-liquid equilibrium data for the methanol-toluene-n-octane and methanoline-nhexane systems at 25°C.
Patent•
04 Apr 1986
TL;DR: In this paper, a metal catalyst on a support material is added to a lignocellulosic biomass mixture with an oil originating from the process, and reaction conditions are maintained at a temperature of 300-400 DEG C and a hydrogen partial pressure of 35-250 bar.
Abstract: Lignocellulosic biomass is thoroughly mixed with an oil originating from the process, and a metal catalyst on a support material is added. The reaction conditions are maintained at a temperature of 300-400 DEG C and a hydrogen partial pressure of 35-250 bar. The reaction products are phase-separated in two stages to obtain the pasting oil, the nett product oil and a hydrogen-containing gas.
TL;DR: In this article, the capacity of binary mixtures of n-octane with n-hexane, 2-methylpentane, 3-methyl pentane, 4-methyl butane and 2,3-dimethyl butane was measured at 298.15
Abstract: Volumetric heat capacities for binary mixtures of n-octane with n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane were measured at 298.15 K in a Picker flow mic...
Proceedings Article•
01 Dec 1986TL;DR: In this paper, the authors used the prediction method of Hanks, Gupta and Christensen in conjunction with several well-known models for the excess Gibbs energy to predict the VLE of binary mixtures of n -hexane and n -octane with hexane isomers.
TL;DR: In this article, the Flory theory of mixtures provides a reasonable correlation of the results with excess enthalpies reported previously, and a tilting dilution dilatometer is used to determine the excess volumes for n-decane + each of the five isomers of hexane.
TL;DR: The partial pressure of hexane was determined along the solubility line of crystalline n-butyl octadecanoate by the static method at 282 to 297 K as discussed by the authors.