By American Institute of Chemical Engineers (AIChE)
This re-creation of a depended on consultant combines and updates the simplest on hand box wisdom on either trayed and packed distillation columns. in a single whole, uncomplicated quantity, it offers a compilation of recommendations instead of a unmarried set of obligatory steps, permitting readers to pick the method that most closely fits their wishes. With its engineer-tested methods and specified motives, the 3rd version presents chemical engineers, plant managers, and different pros with top quality recommendation on assessing and measuring functionality for numerous distillation column forms in a number of functions.
Read or Download AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation PDF
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Additional info for AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation
When this occurs, the flood point determined will be lower than the flood point at steady state. To avoid overshooting or undershooting the flood point, little can be offered as a substitute to raising vapor (or liquid) rates in extremely small steps, and allowing long stabilization periods between steps. It may pay to carry out a preliminary flooding test, in which the steps are large and fast. Typically, vapor (or liquid) rates are raised by 5 to 10% increments at IS to 30 minute intervals during the preliminary test.
The accurate measurement of vapor temperatures calls for probes that permit vapor to flow past them, but are effectively shielded from liquid impingement and other sources of conducted or radiated heat to or from the sensing point. Multiple probes at each vertical location, or a single probe with externally variable lengths of insertion into the column, are recommended. 6 Special attention should be given to measuring the top column temperature. The reflux temperature is usually sub-cooled and will affect measurements of liquid temperature in the reflux false downcomer.
3 Sample Connections To reduce the need for purging large amounts of material, the sample lines should be smaller than 1/2-inch (13 mm), preferably 1/8 to 1/4 inch (3-6mm). They should be as short as possible and, for vapor samples, should be free from low sections where liquid may be trapped. If the permanent block valve at the sample outlet is too large to give the necessary control during withdrawal of the sample, a small valve should be installed downstream from the block valve. This will be subsequently called the sample valve.
AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation by American Institute of Chemical Engineers (AIChE)