Results 221 to 230 of about 3,259 (261)

Kinetics and modeling of fatty acids esterification on acid exchange resins

Chemical Engineering Journal, 2010
Abstract Biodiesel, a renewable fuel of vegetal origin, has been an object of a rapidly growing interest, in the latest years, both as a pure fuel and as blending component to reduce exhaust pollutants of traditional diesel fuel. Biodiesel is conventionally produced through a well-established technology that involves the use of alkaline catalysts and
TESSER, RICCARDO, L. Casale, D. Verde, DI SERIO, MARTINO, SANTACESARIA, ELIO   +4 more
openaire   +2 more sources

Precipitation Acidity: The Role of the Forest Canopy in Acid Exchange

Journal of Environmental Quality, 1980
AbstractIndividual rain events were sampled above and below the forest canopy in Walker Branch Watershed, Tennessee, from August 1977 to June 1978 for the purpose of analysis of acidity and organic content. Strong acid content correlated with sulfate concentrations.
William A. Hoffman, Steven E. Lindberg, Ralph R. Turner   +2 more
openaire   +1 more source

Ion-exchange chromatographic analysis of peroxynitric acid

Journal of Chromatography A, 2016
Ion-exchange chromatographic analysis of peroxynitric acid (O2NOOH) was performed by combining an acidic eluate with an UV-vis detector and immersing the separation column in an ice-water bath. The decomposition behavior of peroxynitric acid in the solution was also studied using this system.
Yoichi Nakashima, Satoshi Ikawa, Atsushi Tani, Katsuhisa Kitano   +3 more
openaire   +2 more sources

Anion exchange separations of aldobionic and aldonic acids

Journal of Chromatography A, 1963
Abstract Several aldobionic acids can be separated from each other by chromatogrphy on anion exchange resins. These separations as well as mutual separations of some simple aldonic acids can be carried out by elution with sodium acetate.When complicated mixtures of aldonic acids are to be separated from aldobionic acids, the aldobionic acids are ...
O, SAMUELSON, L O, WALLENIUS
openaire   +2 more sources

Exchange acidity of montmorillonite and halloysite

Soil Science and Plant Nutrition, 1961
Abstract In the previous article (1), montmorillonitic soils were disclosed to have the ratio of total exchange acidity to y1 less than 3.0 and no ralation of the degree of base saturation to the ratio, although the relation was suggested by AMONINE and WATANABE (2).
openaire   +1 more source

Determination of Argininosuccinic Acid by Ion-Exchange Chromatography

Nature, 1961
RECENTLY, an unknown amino-acid excreted in the urine by two mentally defective children1 was identified as argininosuccinic acid (ASA)2. This is unstable in weakly acid aqueous solutions and cyclizes3. More recently Westall4 has shown that under these conditions two separate types of anhydride (B and C) are formed, rapidly at high but more slowly at ...
D C, CUSWORTH, R G, WESTALL
openaire   +2 more sources

The isolation of peroxomonophosphoric acid by anion-exchange chromatography

Journal of Chromatography A, 1964
Abstract The separation of peroxomonophosphoric acid from orthophosphoric acid by anion-exchange chromatography is described; also the recovery of peroxomonophosphoric acid from the acetate buffer solution used as eluate.
R B, HESLOP, J W, LETHBRIDGE
openaire   +2 more sources

Basicity of Exchangeable Aluminum, Formation of Gibbsite, and Composition of the Exchange Acidity in the Presence of Exchangers

Soil Science Society of America Journal, 1977
Abstract Montmorillonite, vermiculite, and a sulfonic resin were treated with different concentrations of Al(OH) B Cl 3‐ B ...
openaire   +1 more source

PYRUVIC ACID EXCHANGE OF THE BRAIN

Journal of Neurophysiology, 1946
W A, HIMWICH, H E, HIMWICH
openaire   +2 more sources

THE ACID-CATALYZED PROTON EXCHANGE OF CYCLOPROPANE

Tetrahedron Letters, 1963
Richard L. Baird, A. Aboderin
openaire   +1 more source