Document o97p1DJdkgZymEKOGkVJmG9rD

July 9,1993 Dow U.S.A The Dow Chemical Company P.O. Box 400 Plaquemine, Louisiana 70765-0400 Steve Ledoux Bldg. 4601 cc: Doyle Haney, Bldg. 4601 REACTIVE CHEMICALS REVIEW HELD ON 7/8/93 Methanes Plant - Chloroform PSA Unit - Pre Start-up Project rep: Steve Ledoux Committee representatives: Brian Witt, John Monroe, Scott Hanrahan, Charles Carpenter, Allan Sandow, Joe Schell, Gerald Wagener Action Items: 1. Make sure that the proper type of activated carbon was added to the PSA Units heat of absorption could be affected. 2. Consider purging the PSA Unit with nitrogen whenever charging the system with activated carbon. This is aimed at minimizing the dust explosion potential. 3. Consider adding an automatic nitrogen sweep step which will be activated by an abnormally high bed temperature. We recommend selecting a temperature slightly less than the 132 deg C. oxidation temperature for carbon/chloroform (RCT-92-0748). 4. A comment was made that the adsorption step should not be initiated if the bed temperature is abnormally high (50 - 60 deg C.). Consider adding control logic which will permit flow of the feed vent stream and the recycle stream only when bed temperature is acceptable. 5. Concerning future disposal of spent carbon: Confirm that the carbon bed is less than 50 deg C. before dumping and consider wetting the carbon with water before disposal. Gerald Wagener, Chairman Reactive Chemicals Committee CONFTDFNTTAl 00 006730