Document 7MmX23L98jDEKN6jw75dL32Lj

Monsanto ' "O - n t r>c * f i t ' . James D. Wilson - N3A March 13, 1979 ' Analyses of Chlorophenols for Chlorodibenzodioxins T O ' 0. B. Edwards B3SD cc D. J. Dahm - 1250 J. C. M c P h illip s - B3SC J. S. M etcalf - B2NK J. P. Mieure/R. G. Kaley - T3B K. C. Plunkert - N2A D. P. Roman/J. A. Hinkebein - N2B T. A. T a u lli - N10 P. A . `T ie r n e y - N3A We have concluded i t would be most expeditious fo r the Environmental A n a ly tica l Sciences Center in Dayton to analyze the 40 process samples from the chlorophenols plant. Accordingly, we have asked M IC-Environmental Sciences to b r ie f Dayton Lab people on procedures and transm it the samples; t h is they have agreed to do. The two p r io r it y samples (Santophen -1 and PCP from a recent lo t ) w ill be analyzed by MIC-ES t h is week. The EASC has c a p a b ilit ie s s im ila r to those o f MIC-ES, and a r e la t iv e ly li g h t workload at present. They w ill analyze the 40 samples fo r mono-, d i- , t r i - , and tetrachlorod ib enzodioxins and -dibenzofurans. F ir s t r e s u lts are expected by March 31st, with completion due by the end of A p ril.. ( I have asked that.we be n o tifie d as soon as p o ssib le i f th is target date cannot be met.) Plans fo r fu rth e r work, i f any, w ill depend on what we learn from these experiments. I t should be p o ssib le to operate the chlorophenols plant without getting any chlorodibenzodioxins in to the product. Production o f PCP and 2,4-DCP (arid even 2,4,6-TCP) d if f e r s from production of 2,4,5-TCP in that hot, very a lk a lin e con d itio n s are not required. These promote condensation of chlorophenols to dibenzodioxins, a reaction which is otherwise extremely slow. As I understand the process, basic conditions e x is t only during d is t il l a t i o n , and then because c a u stic i s added to the pot to retard corrosion. I suspect that d io x in s form when excess c a u stic i s 'added, and that rearrangements occur then as w ell. I f so, they can be avoided. Vie w ill work with Krummrich PTS to define operating parameters which avoid dioxin formation, i f so desired. JDW/bh Jar C00777 /