Document O3ZY37eJB5z8BGreVGmgv429w

Int^r-office Memo TENNECO CHEMICALS, INC. To P. F. Albanese At Flemington Date April 23, 1969 From A. V. Wagner At Burlington Copy to Attach. Distr. Subject Antlstat Control Antistatic agents are added to our resin for one purpose, to reduce or eliminate static on the resin so that it can be transported without a static problem. It is im portant to add enough antlstat to prevent this problem, but not enough to affect resin properties. The following conclu sions with respective recommendations are necessary to pro vide a controllable system. CONCLUSIONS 1. The antistat additive system should be made more control lable. 2. The antistat addition to the resin wet cake should be made more consistent by determining the percent Ninol in the solution, calibrating the rotometer, and spraying the solution into the wet cake rather than adding by a single stream. 3. To prevent antistat from being added when the drying sys tem is down, a "fool proof" system must be incorporated. It is proposed that the centrifuge and antistat valve be interlocked for this purpose. 4. The drying rate of each type resin must be known so that the desired amount of antistat can be added per pound of resin. Either the centrifuge amperage should be correl ated to the drying rate or a slurry flowmeter be installed for this purpose. RECOMMENDATIONS 1. Calibrate rotometer to insure correct flow of antistat solution. 2. Either correlate centrifuge amperage to drying rate or determine the slurry rate (Engineering has been requested by Production to install a slurry flowmeter) so that the antistat rate can be adjusted to give the desired addition per pound of resin. 3. Interlock centrifuge and antistat valve to prevent possible antistat build-up in the drier when the system is down (Engineering has been requested to carry out this work). COLORITE 015302 Antlstat Control Page 2 4. Develop a test procedure to determine the percent Ninol in the antistat solution. 5. Put a nozzle on the antistat feed line to disperse the antlstat solution. DISCUSSION In order to establish a controllable system the follow ing modifications in our equipment and techniques are necess ary. 1. Ninol Solution - The percent Ninol in the Ninol solution should be determined so that the desired amount can be added to the resin. The present volumetric make-up pro cedure is adequate, if the percent Ninol is known. The rate of solution can be adjusted to compensate for this. 2. Rotometer Calibration - The rotometer should be calibrated to determine the deviation from the scale, if any. This could be carried out during a shutdown or a run that does not use Ninol. 3- Ninol Addition - A nozzle should be added to the antistat feed line to disperse the antistat solution. The present method of addition (single stream) does not result in a uniform mix with the resin. 4. Drier Stoppages - If for any reason the drying system is stopped (eg. broken centrifuge shear pins, high contamin ation resulting in a stoppage), the addition of antistat must also be stopped, as it is possible that this may be forgotten in the haste to correct the problem. It is proposed that the centrifuge and antistat valve be inter locked to prevent this from happening. 5. Ninol to Resin Rate - The resin rate through the drying system must be determined so that the desired amount of antistat per pound of resin can be added. Two means of achieving this are (1) correlate centrifuge amperage to the drying rate and (2) install a slurry flowmeter as has been requested by Produation. A recent complaint from Decca Records concerning the poor bulk flow of Tenneco 388 and the transfer problems we experience with this resin resulted in the returning to Ninol as an antistatic agent. No problems were experienced in trans ferring the T-388 resin processed with Ninol or screening thru 50 mesh, a common problem with ammonia produced resin. COLORXTE 015303 ^ Antistat Control Page 3 The T-588 processed with a controlled Ninol rate had good flow (193 seconds). Only one of seven previous lots had faster flow times. In fact, only one of nine Capitol lots had faster flow times. The second lot had a flow time of 145 seconds which is better yet. This demonstrates that the use of Ninol with the proper control is more advantageous than ammonia from the standpoint of processing ease and that it can be controlled. Production has already instituted a program to improve the control of thi3 system. The Burlington Analytical Group has set up a temporary test to determine percent Ninol in the solution. A finalized test procedure is presently being worked on. This program, therefore, is being carried out. There has been no word, however, when the interlock between the centrifuge and antistat add system would be installed be cause of the heavy Engineering workload. AVW/rjl COLOR1TE 015304 DISTRIBUTION: W. C. Champion R. S. Cole H. H. Duhamel J. C. Fisher C. B. Johnson E. L. Kanyok R. W. Kulick H. G. Morse J. E. Rave111 G. I. Rozand P. R. Scarlto W. D. Wesely M. W. Williams COLORITE 015305