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1、MTBE DRYING COLUMN SHUTDOWN TO STANDBYNOTE: This is for Training only, and is not intended to be used as a step by step procedure.PO/MTBEMTBE DRYING COLUMNSHUTDOWN TO STANDBYPurposeThe purpose of this procedure is to place the MTBE Drying Column System in total reflux in the event of a temporary sto

2、ppage of feed and effluent flows.The act of placing the system in total reflux is to apply the proper of amount of reboiler steam flow to create enough vapors in the overhead system to maintain a steady and continuous reflux flow rate while the reflux drum level controller is in Automatic control.Co

3、nditionsA temporary loss of feed from upstream equipment or a temporary stoppage of effluent to downstream equipment has occurred. In a shutdown to standby condition, only the control valves will be closed using the valves controller unless a control valve is suspected of leaking through.In those sp

4、ecial cases, a block valve will have to be manually closed to eliminate the leakage.NOTE: This is for Training only, and is not intended to be used as a step by step procedure.PO/MTBEGUIDELINE Close bottoms control valve on MTBE Drying Column bottoms. Monitor Drying Column tray temperatures. Monitor Drying Column overhead pressure. Monitor steam flow to Drying Column Reboiler. Monitor the analyzers on Drying Column bottoms stream. Monitor reflux drum water boot level. Verify IBE to Finishing Reactor control valve is closed.