ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Displacement chromatography of amino acids: Effects of selectivity reversal (1994)

Carta, Giorgio ; Dinerman, Adam A.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 40 (1994), S. 1618-1628

add to mindlist on the mindlist

Details

ISSN: 0001-1541

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Separating mixtures of α-amino butyric acid (ABA) and isoleucine (Ile) by displacement chromatography with a cation exchange resin and an alkaline displacer leads to the formation of a displacement train, in which only ABA is recovered as a pure component, while Ile is recovered in a mixed band with ABA. The purity of the Ile band depends on the concentration of the displacer, and essentially pure Ile is obtained when the displacer concentration is reduced to a low value. The observed behavior is explained by considering the nonideality of the equilibrium uptake of these amino acids by the resin. An equilibrium model, representing the pure component isotherms, predicts variable selectivity and the occurrence of selectivity reversal in the two-component system. Analyses using this model based on the theory of coherent waves and a numerical solution of the conservation equations for the displacement chromatography process agree with the observed behavior, predicting the formation of “azeotropic” bands during the development of the displacement train. Such analyses are used to determine under what conditions a complete separation may be obtained for a given experimental system.

Additional Material: 12 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/aic.690401004

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Ternäre intermetallische Phasen des Lithiums mit Elementen der 4. Neben- und 5. Hauptgruppe mit statistischer Metallverteilung im „Kationen“-TeilgitterProfessor Hanskarl Müller-Buschbaum zum 60. Geburtstage gewidmet (1991)

Adam, A. ; Schuster, H.-U.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 597 (1991), S. 33-39

add to mindlist on the mindlist

Details

ISSN: 0044-2313

Keywords: Intermetallic phases (ternary) ; lithium ; 4A metals ; 5B elements ; preparation ; crystal structure ; X-ray ; neutron scattering ; Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Ternary Intermetallic Phases of Lithium, Transition Metals of the 4th Group and Elements of the 5th Maingroup with Statistical Metal Distribution in the „Cation“-SubstructureThe results of X-ray investigations and neutron diffraction on new and in some cases already known [1, 2] ternary intermetallic phases of Lithium with transition metals of the 4th group (b) and those of the 5th main group (X = P, As, Sb, Bi) will be reported. They crystallize in a partly „filled“ antifluorite type structure with a statistical Li/B-distribution in the tetrahedral sites. The structures are obviously stabilized by small amounts of enclosed d-elements.

Notes: Es wird über Röntgenstrukturuntersuchungen und Neutronenbeugung an neuen und einigen schon bekannten [1, 2] ternären intermetallischen Phasen des Lithiums mit Elementen der 4. Nebengruppe (B) und Elementen der 5. Hauptgruppe (X = P, As, Sb, Bi) berichtet. Sie kristallisieren in einer teilweise „aufgefüllten“ Antifluorit-Struktur mit statistischer Li/B-Besetzung der Tetraederlücken, die offenbar durch den Einbau von geringen Mengen der Übergangsmetalle stabilisiert wird.

Additional Material: 2 Ill.