By American Institute of Chemical Engineers (AIChE)
This re-creation of a depended on advisor combines and updates the simplest to be had box wisdom on either trayed and packed distillation columns. in a single entire, undemanding quantity, it provides a compilation of recommendations instead of a unmarried set of obligatory steps, permitting readers to pick the process that most nearly fits their wishes. With its engineer-tested methods and designated causes, the 3rd version presents chemical engineers, plant managers, and different pros with first class suggestion on assessing and measuring functionality for a number of distillation column varieties in a number of functions.
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Extra info for AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation
An increase in reflux flow rate does not result in an increase in heat input required to maintain the same bottom column temperatures. The increased reflux first accumulates in the column, eventually leaves in the overhead, and never reaches 44 Trayed and Packed Columns the bottom of the column. This is due to massive entrainment from the top tray. 6. A heat balance around the overhead condenser reveals liquid carryover into the vapor line from the column. This, of course, could be due to high entrainment and therefore is not conclusive of a flooded column.
3 1 2 . 2 Internal Samples for Overall Performance In tests for maximum and minimum throughputs, and for overall column efficiency, internal samples are not required, since internal compositions can be estimated accurately enough to calculate fluid densities and enthalpies. However, this point should be checked by a preliminary heat balance. 0 Pressure Profiles Pressure-drop measurements are always desirable, especially in packed columns. 0). 0 Data Requirements-Physical Properties 3 1 4 . 1 Test Mixtures The test mixture must be suited to the column being tested.
Measuring Pressure Drop with Purge Liquid Seal 30 Trayed and Packed Columns SEAL POT —ex- 3/r PRESSURE TAP UNE —CX- i X FILL LINE — X MANIFOLD VALVE XH-tX- LJ MANOMETER VALVE MANOMETER (OR DIFFERENTIAL PRESSURE INSTRUMENT) Figure 9. 3 Static Liquid Seal: A static liquid seal is used on columns where the process fluids must be kept out of the instrument lines, but where a continuous purge is impractical. The sealing liquid then should be immiscible with, and heavier than, the column liquid or condensate.
AIChE Equipment Testing Procedure - Trayed and Packed Columns: A Guide to Performance Evaluation by American Institute of Chemical Engineers (AIChE)