Abstract:
A control system for a selective hydrogenation reaction computes the desired feed input temperature to the reactor in response to measurements of flow rate and analyses of the inlet and effluent streams. The temperature of the feed stream is regulated in response to a comparison of the computed temperature with a measured temperature of the feed stream.
Abstract:
DETERMINE THE REQUIRED EXTERNAL REFLUX FLOW RATE. THE FLOW RATE OF ONE OF THE LIQUID STREAMS IS MANIPOLATED RESPONSIVE TO A DESIRED CONTROL CRITERIA WHILE THE FLOW RATE OF THE OTHER LIQUID STREAM IS MANIPULATED TO PROVIDE THE BALANCE OF THE EXTERNAL REFLUX.
IN A FRACTIONAL DISTILLATION SYSTEM HAVING TWO SOURCES OF LIQUID REFLUX STREAMS WHICH WILL PARTIALLY VAPORIZE WHEN COMBINED FOR SUCH USE, THE FLOW RATE AND TEMPERATURE OF EACH OF THE LIQUID REFLUX STREAMS ARE MEASURED AND SIGNALS REPRESENTATIVE THEREOF ARE APPLIED TO A COMPUTER-COMTROLLER. THE SIGNALS ARE COMBINED TO ESTABLISH A SIGNAL REPRESENTATIVE OF THE PREFLASH TEMPERATURE OF THE COMBINED STREAM, WHICH IS THEN EMPLOYED IN AN INTERNAL REFLUX CONTROL TO
Abstract:
The flow of heat exchange fluid through the reboiler of a fractionation column is controlled in response to a computation of the heat actually supplied by the fluid. The set point of the flow controller is established from a measurement of the separation made by the column or the liquid level in the lower region of the column.