Document 71dxe3Nbmdzj8q6eEq2yYxn4R

Bldg. 2511 July 19,1994 Dow U.S.A The Dow Chemical Company P 0 Bo* <J00 Piaouemine, Louisiana 70765-0400 Hal Martin Bldg. 5301 cc: Carl Mercer, 5301 REACTIVE CHEMICALS REVIEW CONDUCTED ON JULY 19, 1994 Project: Modifications to the Glycol 2 Acetylene Hydrogenation Reactor - Process Change Committee representatives: John Monroe, Steve Milligan, Joe Schell, Seb Corbino, Gerald Wagener Scope: The R-10 system is being modified to hydrogenate acetylene in the methane off-gas from LHC 2 & 3 with a different catalyst (3 cubic feet of 0.03% Pd on Alumina). The catalyst which is being replaced is a nickel hydrogenation catalyst. Action items: 1. Scenario: Off-gas exchanger leak resulting in a flammability hazard in the condensate tank area. Install a combustible gas detector head on the seal- leg of the DV-83 condensate tank. ^ "patb > CW., . /mc cc 2. Scenario: Insufficient amount of water added to nickel catalyst during unloading and disposal resulting in a flammability hazard. The catalyst should be kept wet at all times. Make sure that free water is standing in drums containing the old nickel catalyst. * t 3. Scenario: Runaway exothermic hydrogenation of unusually high levels of ethylene from LHC 2 & 3. The probability of this happening appears to be low, however, as an extra line of defense the high temperature trip on R-10 should be set no higher than 120 deg C. 4. A recommendation was made to contact Cathy Zorica at LHC 3 and review their start-up procedures on similar hydrogenation catalyst systems, w'" ^0 A 136344 conftdfnttai 2- - 5. Consider installing retaining screens at the interface of the 3/16 inch S Pd/alumina catalyst tablets and the 5/16 inch inert rings. Please respond in writing to the committee chairman within one month as to action taken or planned in regard to these concerns. Gerald Wagener, Chairman Reactive Chemicals Committee HO A136745 confidential