Document zdgV1MggnYNd3Rpbwv1r4aOVa

Monsanto from .name * location, h. W. Luebke - St. Louis Research DATE SUBJECT REFERENCE February 6, 1967 CC: E. M. Emery - Res. 2 L. C. Fuhrmeister - Anniston THERMAL STABILITY OF AROCLOR 5060 H. L. Hubbard - Res. 1 (CHLORINATED SANTOWAX R) J. F. Quinn - Res. 1 TO Gerald Miller Anniston The following thermal stability experiments have been conducted with Aroclor 5060 feeds to the old and new still systems at Anniston. The question of thermal stability arose after burning out a heating coil and experiencing increased still residues in the newly modified system: 1) Pressure DTA experiments were run up to 362C. with no significant reactions observed. Cell pressure records showed only minor gas evolution in the 250 to 325C. temperature range K10 psi in a 1:1 sample to freeboard ratio). A low level exothermic drift, observed in both temperature differential records above 325C., may be the onset of decomposition. 2) Regular DTA experiments were run up to 409C., still with no significant reaction observed. The start of a slow exothermic reaction above 325C. looks probable, but the rate of decomposition would be very low. Both samples . gave identical results. 3) Du Pont 900 DTA was used to look at one sample for com parison with our DTA results. A series of exothermic peaks were observed from about 300 to 450C. This experiment was not run in a closed system as were the others. A copy of the thermogram is attached. In these experiments, we saw no evidence of gross instability, below about 400C. There were indications of slow decompo sition above 325C. The higher levels of residue produced in the new still system probably result from longer exposure to high temperatures in the heating coil rather than from poorer stability of the Aroclor 5060 with the higher quaterphenyl content (new system). H. W. Luebke 0'b Reference: DTA #67-11, 12, 14 and 15 Attachment (l) ' IN-IO REV. ! t <69 dsw 551643 STLCOPCB4090060 M DSW 551644 STLCOPCB4090061