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Moody [1] studied the efficiency of a GC separation of 2-butanone on a dinonyl phthalate column. Evaluating plate height as a function of flow rate gave a van Deemter equation for which A is 1.65 mm, B is 25.8 mm •mL/min, and C is 0.0236 mm-min/mL. a) Using Microsoft Excel, plot a graph of H versus u for flow rates

Moody [1] studied the efficiency of a GC separation of 2-butanone on a dinonyl phthalate column. Evaluating plate height as a function of flow rate gave a van Deemter equation for which A is 1.65 mm, B is 25.8 mm •mL/min, and C is 0.0236 mm-min/mL. a) Using Microsoft Excel, plot a graph of H versus u for flow rates

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Moody [1] studied the efficiency of a GC separation of 2-butanone on a dinonyl phthalate column. Evaluating plate height as a function of flow rate gave a van Deemter equation for which A is 1.65 mm, B is 25.8 mm *mL/min, and C is 0.0236 mm-min/mL. a) Using Microsoft Excel, plot a graph of H versus u for flow rates in the range of 5 - 120 mL/min. Your graph must include curves due to the contributions of all the terms ( i.e. curve for A, B and C and the overall curve) b) For what range of flow rates does each term in the Van Deemter equation have the greatest effect? c) How much is the optimum flow rate for this column? d) How much is the height of a theoretical plate for the flow rate in part C ?
Transcribed Image Text:Moody [1] studied the efficiency of a GC separation of 2-butanone on a dinonyl phthalate column. Evaluating plate height as a function of flow rate gave a van Deemter equation for which A is 1.65 mm, B is 25.8 mm *mL/min, and C is 0.0236 mm-min/mL. a) Using Microsoft Excel, plot a graph of H versus u for flow rates in the range of 5 - 120 mL/min. Your graph must include curves due to the contributions of all the terms ( i.e. curve for A, B and C and the overall curve) b) For what range of flow rates does each term in the Van Deemter equation have the greatest effect? c) How much is the optimum flow rate for this column? d) How much is the height of a theoretical plate for the flow rate in part C ?
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