... to the velocity of the water entering the well ... of lactate and formate, with acetate, propionate, and ... dilutions of sodium bromide solution, this peak was ...

Extraction equilibria of acetic acid and propionic acid with hexane solutions of trioctyl amine, trioctyl phosphine oxide, and tributyl phosphate were studied. The species formed in the systems were estimated, and the distribution coefficients and the equilibrium constants for these species were evaluated.s

Adsorption of organic acids (acetic, propionic, oxalic acids and mixed acids) on activated alumina from aqueous solution was done at various temperatures (10, 20, 30, 40, 50 C). The isotherms obeyed Langmuir and Freundlich equations from which Vm, the amo...

Inhibition of the fermentation of propionate to methane and carbon dioxide by hydrogen, acetate, and propionate was analyzed with a mesophilic propionate-acclimatized sludge that consisted of numerous flocs (size, 150 to 300 {mu}). The acclimatized sludge could convert propionate to methane and ...

For the study of complex systems in buffered solutions with definite pH, it is necessary to have a knowledge of the interinediate reactions of the primary solutions and to estimate the stability of the complexes with the buffer. The acetate complex region earlier studied was extended to a polarographic investigation 0f U ...

An extractive fermentation process was developed to produce propionate from lactose. The bacterium Propionibacterium acidipropionici was immobilized in a spiral wound, fibrous matrix packed in the reactor. Propionic acid is the major product from lactose fermentation, with acetic acid and carbon dioxide as byproducts. ...

Adsorption of organic acids (acetic, propionic, oxalic and mixed acids) from aqueous solution on activated charcoal has been studied at different temperatures. Using well known equations (Langmuir, Freundlich, Clausius Clapeyron) the specific surface area...

The radioisotope technique was used to study the removal of organic acid contaminants from dilute aqueous solutions onto activated carbon. Acetic acid, propionic acid, n-butyric acid, n-hexanoic acid and n-heptanoic acid were studied at 278, 298, and 313/sup 0/K. Three bi-solute acid mixtures ...

May 14, 2001 ... Acetic and propionic acid and isoamyl alcohol. Isovaleric acid ... Isovaleric acid. Acetic, propionic and butyric acid ...

The radioisotope technique was used to study the removal of organic acid contaminants from dilute aqueous solutions onto activated carbon. Five single-solute systems (acetic acid, propionic acid, n-butyric acid, n-hexanoic acid, and n-heptanoic acid) were...

The radioisotope technique was used to study the removal of organic acid contaminants from dilute aqueous solutions onto activated carbon. Acetic acid, propionic acid, n-butyric acid, n-hexanoic acid and n-heptanoic acid were studied at 278, 298, and 313 ...

The volatile products of Kolbe oxidation of carboxylate ions in water and Me/sub 2/SO solvents have been detected by permeable membrane mass spectrometry (PERMS). Deconvolution of the mass spectral data by factor analysis allows estimation of carbon dioxide, oxygen, and ethane during the course of electrolysis. In water solutions, electrolysis of water occurs in competition ...

anaerobic digestion are acetic, propionic, and butyric acids with lesser. 13] amounts of formic and valeric acids 3 . Propionic and valeric acids ...

Acetate, propionate, and butyrate are intermediate products in the anaerobic bioconversion of organic matter to methane and carbon dioxide. This study examines the effects of acetate, propionate, and butyrate on the thermophilic oxidation of propionate in continuous-flow methanogenic sludge bed ...

Preparation of the superconducting Y-Ba-Cu-O films by means of sol-gel method was studied using a propionic acid solution of corresponding metal acetates as a starting material. Highly c-axis oriented Y-Ba-Cu-O superconducting films were obtained by heat ...

Adsorption of organic acids (formic, acetic and propionic) and iodine has been studied at room temperature in aqueous and non-aqueous systems on Fullers' earth. Using the well known Langmuir equation, the constants 1/K1K and 1/K were evaluated for most of...

The sonolysis of argon-saturated aqueous solutions of sodium acetate, sodium propionate, amino acids, and sugars was investigated by ESR and spin trapping over a large range of concentrations. The spin trap 3,5-dibromo-2,6-dideutero-4-nitrosobenzene sulfonate was used to examine the possibility of detecting new radicals specifically ...

Vapor-liquid equilibrium (VLE) data have been measured for mixtures of ethyl acetate with acetic acid at 338 and 346 K and for mixtures of ethyl propionate with propionic acid at 358 and 368 K. The measurements were carried out in a recirculation still similar to that of Dvorak and Boublik. The data have been ...

... Descriptors : *COATINGS, *FUNGICIDES, TEST METHODS, CELLULOSE, ACETATES, PROPIONATES, LACQUERS, PHENYL RADICALS ...

electrolytes with various ester co-solvents, including methyl acetate (MA), ethyl acetate. (EA), ethyl propionate. (EP), and ethyl butyrate (EB). ...

The effects of acetate, propionate, and butyrate on the anaerobic thermophilic conversion of propionate by methanogenic sludge and by enriched propionate-oxidizing bacteria in syntrophy with Methanobacterium thermoautotrophicum delta H were studied. The methanogenic sludge was cultivated in an upflow anaerobic ...

Feldspar dissolution will enhance sandstone porosity if the released aluminum can be transported away in the subsurface waters. Carboxylic acids have been proposed to provide hydrogen ions to promote dissolution and anions to complex aqueous aluminum to keep it in solution. However, the hydrogen ions should react quickly following acid generation in source beds, leaving ...

Four cows with exteriorized carotid arteries were in an intensive study of concentrations in plasma and mammary extraction of propionate. A restricted-roughage, high-grain diet produced higher arterial propionate concentrations and larger carotid-subcutaneous abdominal vein (arteriovenous) differences that the control diet. Concomitant changes in ...

A new method for synthesizing homogeneous oxide powder, reported earlier, is studied. This technique involves spray drying a solution containing an oxidizing and reducing salt into an intimately mixed powder. The spray-dried powder undergoes an internal oxidation-reduction reaction which completely converts it into the mixed oxide at <300�C. The resulting powder is ...

The metabolism of monocarboxylic acids is of central importance for bacteria in their natural habitat as well as during biotechnological production. Although biosynthesis and degradation are well understood, the transport of such compounds is still a matter of discussion. Here we present the identification and characterization of a new transport system in Corynebacterium glutamicum with high ...

... Descriptors : (*POLYMERS, SOLUTIONS(MIXTURES)), (*ACETATES, SEDIMENTATION), (*SEDIMENTATION, ACETATES), SOLUTIONS ...

Water-enhanced solvation (WES) was explored for Lewis acid solutes in Lewis base organic solvents, to develop cheap extract regeneration processes. WES for solid solutes was determined from ratios of solubilities of solutes in water-sat. and low-water solvent; both were determined from solid-liquid equilibrium. Vapor-headspace analysis ...

A simple method is described for the quantitative analysis of urinary delta-aminolevulinic acid. The 2-methyl-carbethoxy-4-(3-propionic acid) pyrrole, produced by the condensation of delta-aminolevulinic acid with ethyl acetoacetate, is almost completely extracted from an aqueous solution with ethyl acetate without resorting to ...

An improved process for separating rare earths by precipitating their hydroxides at low temperatures is given which increases the oxide content of the precipitates from 25 up to 50% and the filtration rate by a factor of 10 to 100. The process comprises carrying out the precipitation at 25 to 50 deg C with a solution of alkali or ammonium hydroxide and an aliphatic ...