Fractionating process control system

C - Chemistry – Metallurgy – 10 – G

Patent

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202/115, 196/274

C10G 7/00 (2006.01) B01D 3/32 (2006.01)

Patent

CA 1077427

METHOD AND APPARATUS FOR MONITORING LIQUID LOADING WITHIN A FRACTIONATING PROCESS SYSTEM FOR THE PURPOSE OF PROVIDING NOVEL CONTROL CHARACTERISTICS USEFUL THEREIN ABSTRACT OF THE DISCLOSURE In accordance with the present invention, liquid load- ings on one or more trays of a fractionating column is monitored to provide a surprisingly useful control characteristic related to the efficiency (or lack thereof) of not only the fractionating column itself but also associated processes linked to the column. Accurately monitoring the liquid loading within the column is provided by a liquid loading meter means of the present invention positioned within a channel connecting two adjacent trays of the column. In accordance with one aspect of the present invention, the liquid loading meter means includes cooperative baffle means mounted interior of the channel (i) for reducing channel cross sectional flow area and (ii) in conjunction with an upright measuring weir attached at the downstream end of the cooperative baffle means, to provide a repository interior of the channel by which a reservoir of liquid condensate interior of the column can be first collected and then allowed to overflow relative to the measuring weir in a manner that provides useful information as to the liquid loading of the trays within the column. Differential pressure measuring means is also provided with a sensing means in the vicinity of the measuring weir. In turn, the differential pressure measuring means is connected in series to a recording means located external of the column. Result: As overlimit swings in liquid loading occur, corrective action, say via separate process controller means, can be quickly implemented to bring the system back to stable operations. -2-

238590

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