Correction - Distribution in Hydrocarbon Solvent Systems

1947 ◽  
Vol 39 (12) ◽  
pp. 1684-1684
Author(s):  
T. G. Hunter ◽  
T. Brown
Keyword(s):  
Hydrocarbon Solvent ◽  
Solvent Systems

Quaternary liquid-liquid equilibrium studies on hydrocarbon-solvent systems

1992 ◽  
Vol 37 (1) ◽  
pp. 104-106 ◽  
Author(s):  
Jyotsna Naithani ◽  
Mohan K. Khanna ◽  
Shrikant M. Nanoti ◽  
Bachan S. Rawat
Keyword(s):  
Liquid Equilibrium ◽  
Equilibrium Studies ◽  
Hydrocarbon Solvent ◽  
Solvent Systems

Manipulation of the Liquid−Liquid Equilibrium of Vertrel-XF + Hydrocarbon Solvent Systems with the Addition of a Third Component

2002 ◽  
Vol 41 (11) ◽  
pp. 2792-2797 ◽  
Author(s):  
Joel A. Luckman ◽  
Jason A. Berberich ◽  
Daniel C. Conrad ◽  
Barbara L. Knutson
Keyword(s):  
Liquid Equilibrium ◽  
Hydrocarbon Solvent ◽  
Solvent Systems

Vapor-Liquid Equilibrium Ratios of Acid Gases and Hydrocarbons in Methyl Cyanoacetate

1972 ◽  
Vol 12 (04) ◽  
pp. 283-288
Author(s):  
Byron B. Woertz
Keyword(s):  
Ambient Temperature ◽  
Atmospheric Pressure ◽  
Pilot Plant ◽  
Temperature Inversion ◽  
Liquid Equilibrium ◽  
Vapor Liquid Equilibrium ◽  
K Value ◽  
Hydrocarbon Solvent ◽  
Multicomponent Gas ◽  
Solvent Systems

Abstract A new set of vapor-liquid equilibrium ratios (K-charts) is presented for methane through n-octane, nitrogen, CO2 and H2S, all in methyl cyanoacetate (MCA). The K-values for the hydrocarbons show a temperature inversion at pressures of 1,000 psia and above in that solubility in MCA increases with temperature. Nitrogen appears to exhibit temperature inversion at all pressures studied. Nitrogen, CO2 and methane were the only components in which the K-values did not increase at high pressure in the pressure ranges studied. At some temperatures K-values of ethane and propane also did not increase with pressure at high pressures. pressures Introduction Additional pilot plant data have recently been published on the use of methyl cyanoacetate (MCA) to published on the use of methyl cyanoacetate (MCA) to remove acid gases (CO2 and H2S) from highpressure natural gas. In that publication, K-values for the dissolved components, which had originally been published by the author in 1965, were omitted. Since published by the author in 1965, were omitted. Since 1965 additional equilibrium experiments have been made, resulting in some changes and in extension of the pressure range covered. Determinations of hydrocarbon K-values in hydrocarbon systems have been made elsewhere from time to time over a period of about 40 years, and information is still being developed. Thus, it seems appropriate that K-values of hydrocarbon-solvent systems be extended and modified as new data are obtained. The original K-value data were obtained from equilibrium experiments with MCA and a multicomponent mixture of CO2, methane, ethane, propane and n-butane. Some of the mixtures also propane and n-butane. Some of the mixtures also contained H2S. Compositions of the phases, resulting from flashing rich solvent in the pilot plant, were used with the previous data to estimate plant, were used with the previous data to estimate K-charts for nitrogen, i-butane, the pentanes, and all the K-values at low pressure. Thus, from the original equilibrium experiments (150 or 600 psia; and 0 degrees, 40 degrees or 70 degrees F) and the pilot plant flashing data, the original K-charts pilot plant flashing data, the original K-charts (Figs. 6 through 15, inclusive, in Ref. 2) were obtained. NEW K-VALUE EXPERIMENTS* The new data consist of the following:1. K-values calculated from atmospheric pressure solubility at either ambient temperature or 33 degrees F (Bunsen solubility).2. K-values determined at about 1,000 to 1,500 psia on multicomponent gas mixtures containing psia on multicomponent gas mixtures containing i-butane and n-pentane in addition to previously mentioned components. Also, measurements were made of the solubility of pure nitrogen or methane in MCA at these pressures.3. K-values at 2,000 psia for CO2, H2S and methane at 0 degrees or 100 degrees F.4. K-values calculated from chromatographic analysis of air in equilibrium with known mixture of MCA with benzene, toluene, or -xylene at atmospheric pressure and either ambient temperature or 33 degrees F.5. K-values for i-pentane, n-pentane, n-hexane, n-heptane and water calculated from liquid-liquid miscibility experiments at either ambient temperature or 33 degrees F. The method of (Galimberti and Campbell was used in smoothing and extrapolating the data. In this method, at constant system pressure and temperature, the log of the K-value of hydrocarbons is a linear function of (absolute critical temperature). This method was originally proposed for hydrocarbon systems, but also seems to work well on hydrocarbon-solvent systems. SPEJ P. 283

Distribution in Hydrocarbon-Solvent Systems

1947 ◽  
Vol 39 (10) ◽  
pp. 1343-1345 ◽  
Author(s):  
T. G. Hunter ◽  
T. Brown
Keyword(s):  
Hydrocarbon Solvent ◽  
Solvent Systems

Hydrogen-Bonded Solvent Systems

1969 ◽  
Vol 67 (1_3) ◽  
pp. 168-168
Author(s):  
H. G. Hertz
Keyword(s):  
Solvent Systems ◽  
Hydrogen Bonded

VANILLINSÄURE ALS ENDPRODUKT DES STOFFWECHSELS VON ADRENALIN UND NORADRENALIN. II.

1963 ◽  
Vol 44 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Wilhelm Dirscherl ◽  
Helmut Thomas
Keyword(s):  
Rat Liver ◽  
Paper Chromatography ◽  
Column Chromatography ◽  
Vanillic Acid ◽  
Hippuric Acid ◽  
Single Spot ◽  
Solvent Systems ◽  
Perfusion Experiment ◽  
Kinetics Of

ABSTRACT Perfusion of rat liver with vanillic acid yielded only one metabolite. In paper chromatography with three different solvent systems, the substance showed the same RF-values as vanillyolglycine (3-methoxy-4-hydroxyhippuric acid) and in mixed chromatograms there was only one single spot. After separation by column chromatography, the UV- and IRspectra of the reaction product were identical with those of 3-methoxy4-hydroxy-hippuric acid. During the perfusion experiment, the kinetics of the conjugation were investigated.

OPTIMIZATION OF THIN LAYER CHROMATOGRAPHY METHODS FOR SEPARATION AND IDENTIFICATION OF ANTIDEPRESSANTS IN THEIR MIXTURE

2014 ◽  
Vol 21 (1) ◽  
pp. 11-15
Author(s):  
Daiva Kazlauskienė ◽  
Guoda Kiliuvienė ◽  
Palma Nenortienė ◽  
Giedrė Kasparavičienė ◽  
Ieva Matukaitytė
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Solvent System ◽  
Ammonia Solution ◽  
Relative Standard ◽  
Rf Values ◽  
Solvent Systems ◽  
Paroxetine Hydrochloride ◽  
Fluvoxamine Maleate ◽  
Layer Chromatography

By conducting the toxicological analysis it is meaningful to determine the analytical system that could identify simultaneously several medicinal preparations quickly and precisely. The purpose of this work was to create and validate the method of thin-layer chromatography that would be suitable to separate the components of antidepressant mixture (amitriptyline hydrochloride, paroxetine hydrochloride, sertraline hydrochloride, fluvoxamine maleate and buspirone hydrochloride) and to identify them. The system was validated with regard to the sensitivity, repetition of data, resistance and particularity. The solvent systems with potential of high separation of components in their mixture were created: acetonitrile, methanol, ammonia solution 25 percent (85:10:5); acetonitrile, methanol, ammonia solution 25 percent (75:20:5); dichlormethane, 1,4-dioxane, ammonia solution 25 percent (50:45:5); dichlormethane, 1,4-dioxane, ammonia solution 25 percent (42:55:3); trichlormethane, 1,4-dioxane, ammonia solution 25 percent (25:70:5); trichlormethane, 1,4-dioxane, ammonia solution 25 percent (60:36:4). One of the most suitable solvent systems for separation of the analyzed mixture (sertraline, amitriptyline, paroxetine, buspirone, fluvoxamine) was determined – acetonitrile, methanol, ammonia solution 25 percent (85:10:5). When this solvent system was used, the average Rf values of the analyzed compounds differed the most. Validation was conducted – the relative standard deviation (RSD, percent) of the average Rf value of the analyzed compounds varied from 0,6 to 1,8 percent and did not exceed the permissible error of 5 percent. The sensitivity of methodology was determined by assessing the intensity of the mixture’s spots on the chromatographic plate. The detection limit of buspirone was 0,0012 µg; sertraline – 0,0008 µg; amitriptyline – 0,0004 µg; fluvoxamine – 0,0004 µg; paroxetine – 0,0008 µg. The resistance of results to the changed conditions – it was determined that when the amounts of the solvents acetonitrile and methanol were increased or decreased to two milliliters, the average Rf values of the analyzed compounds did not change statistically significantly

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