Pentane column height

Fig. 20. Effect of temperature driving-force on optimal column height— pentane-water system (S9).

For comparison with other evaporation studies, it is noteworthy that the data presented in Fig. 21 was obtained with a temperature approach of 1.7°C at the continuous-phase outlet, and that the pentane feed entered the nozzles subcooled by some 1.5°C. A reduction in the free-rising stream line zone is feasible with superheated dispersed-phase feeds and closer approach temperatures. This would greatly increase the volumetric transfer coefficient which is inversely proportional to the temperature driving-force and the optimal column height. 

FIGURE 6.4 Mean concentration of CB153 in pg/g pentane-extractable liquid (PEL) in whole fish from the Dutch Wadden Sea and the cellular fraction of the blood of harbor seals. Numbers of CBs are given in order of elution from the GC column by their systematic numbers according to lUPAC rules as proposed by Ballschmitter and Zell (1980). All concentrations are proportional to the height of the bar. (Reproduced from Boon et al. 1992. With permission.)... 

A pentane peak elutes from a 1-m GC column in 200 s. Just before elution its width, 4a, is 8 cm. What is the standard deviation, r, of the eluted peak in time units Calculate the plate height in two ways, first based on the a value and second on the t value. 

A1.2.2 Enter a 1 to 5-mL sample into the partition column and reverse the carrier gas flow after -pentane is separated. Obtain a corresponding chromatogram of the reference standard. Measure the peak heights of ethane through /i-pentane and the areas of the pentane peaks of the standard. Make calculations on ethane and heavier components in the same manner as for the complete analysis method. Methane and lighter may be expressed as the difference between 100... 

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