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The Journal of the Royal Institute of Thailand Vol. 27 No. 3 Jul.-Sept. 2002 Commercialization of the Worldûs First Oleflex Unit ˆˆˆ of the reactor. Reactor 3 screen was severely blocked causing exces- sive pressure drop. The screen de- fect was probably caused by un- known impact to the spot. After the screen was repaired and the damaged part replaced, the unit was brought back on line. Reac- tor pressure drop recorders and alarms were installed on all reac- tors for early detection of impend- ing problems. 2. Coking problems a) Soot Coke Formation-Loss of Sulfur Injection Following the Void Blowing problems, the unit was re- paired and put back in operation on May 17, 1990. While the unit Fig. 1 Oleflex catalyst regeneration section Table 1 Operational highligh January 1990 Initial start-up with 1 st batch of DEH-6 February 1990 Void blowing June 1990 Loss of sulfur injection-coking problem (clean and repair screens) December 1990 Catalyst deactivation by CO (apply PSA-H2 in April 1991) April 1991 Catalyst change on the fly to DEH-6 2 nd batch February 1992 Switch to DEH-8 catalyst, install electric heater at surge pot and change screen material to SS 347 May 1993 Replace HCFE February 1994 Add Rx effluent cooler and replace cold box January 1995 Catalyst change on the fly to DEH-10 August 1996 Catalyst collector cracked by PTA (material change to 347 in 1997) April 1998 Change catalyst to DEH-12 after a major turnaround January 2002 Lastest major turnaround DEH-12 kept in operation