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Digitale Medien

Gas chromatographic method for the analysis of nitrochlorobenzene isomers (1986)

Mhalas, J. G. ; Rao, N. V. Rama ; Sriram, M.

Springer

Chromatographia 21 (1986), S. 110-112

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ISSN: 1612-1112

Schlagwort(e): Gas chromatography ; Nitrochlorobenzene isomers

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary An efficient, reproducible and rapid gas chromatographic method for the analysis of nitrochlorobenzenes has been described in this paper. The method uses FFAP as stationary phase and 3,4-dichloronitrobenzene as internal standard. The total analysis time of the method is less than 15 minutes with a coefficient of variation ranging from 0.41% to 1.19% for different levels of three isomers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02311685

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Digitale Medien

Unsteady axial mixing by natural convection in a vertical column (1992)

Baird, M. H. I. ; Aravamudan, K. ; Rao, N. V. Rama ; [weitere]

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 38 (1992), S. 1825-1834

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Unsteady axial mixing due to addition of a batch of sodium chloride solution at the top of a water-filled tube (2.63 cm i.d.) has been studied by measuring the developing concentration profile and the advancing front with dye added to the brine. Data have also been obtained with added baffle plates, with the use of a viscous aqueous solution, and in smaller diameter (1.48, 1.91 cm) tubes. Results can be approximately correlated by means of a model based on unsteady one-dimensional turbulent dispersion. Laminar flow affects the behavior of the advancing front at which the salt concentration is lowest.

Zusätzliches Material: 12 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690381113

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Axial mixing in a reciprocating plate column with very small density gradients (1991)

Baird, Malcolm H. I. ; Rao, N. V. Rama

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 37 (1991), S. 1019-1026

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Axial dispersion coefficients have been measured in single-phase flow conditions in a 5.08-cm-dia. reciprocating plate extraction column. The measurements were done under steady-state conditions by analyzing temperature profiles (for hot and cold water mixing) and concentration profiles (for mixing of water and salt solutions). The results confirm previous published data of Holmes et al. (1991) in showing that axial dispersion is increased strongly in the unstable situation, where liquid density increases with height. The earlier work is extended to the condition where buoyant energy dissipation is exceeded by mechanical energy dissipation by four orders of magnitude. Even in this case, axial mixing is increased significantly by density gradient-induced instability. Results have been correlated by a simple equation based on a mixing length model.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690370707

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