Document wqnRjVgRV55beRwQY0QwL1pVQ

\ V c ^' * \ s '' v* </^ f <sV < .* It^ R. R. Smith V c WV I* J> ^ i 't *> ,1 '+ . * t: -4 , 4 4 *^ ej^ A iX-'V ,,' From \ i9 ft ^ A Subject: R. C. Tebof Houston, D. E. Knittig, Aberdeen March 5, 1990 5305 RESIDUAL VCM REDUCTION &\T During the four months, many experimental done to Some of the results looked very promising, recommendations are listed below. runs and VCM in 5305. Some of the resulting Recommendations reliability needs to be improved, swings blend tank and variability which RVCM. Blend tank and flow consistently below recommended alp RVCM removal in the blend tanks and t; &duce RVCM variabilitv. i' I / 1\ should the effect of changing the 5303! RVCM can be significantly reduced by shifting the By targeting a 120 micron average particle RVCM can be reduced by about 30% 150*F. should to Heating the going to the silos also has a effect by reducing RVCM by 25%. 4. A system should be installed to steam heat the blend to maintain the temperature at 150*F. By keeping the blend tank temperature at 150*F, blend tank RVCM can be reduced by up to 50%. For immediate benefit, operators should try to keep the blend tank temperature up by rinsing the large reactors with hot water. 5. needs to investigate ways to improve small and large blend tank agitation. Currently, a heel forms on the bottom of the blend tank which does not . Improved agitation would result in more uniform blend tank aeration. 6. Rotary dryer controls need to be improved. Loose control of the rotary dryers causes RVCM variability out of the dryer best ways to improve 5305 RVCM further recomm A Rich Tebo Process Engineer Doug Knittig Process Engineer RWS \ JDO \ EJM \ RBN \ SCH \ PCS \ JME nr .. t VAB.0001104029