Document QX8BOaZ7KjjyXa8a9yYVq2v3v

rr V m . *v t AV \ J l i Th# raaulta of our analysis of four autoclave batches are sum m arized in tha attached graph* (Figura* 1-4). 1 believe the code ia self-explanatory with the possible i exception of D2MEO. T his re fe rs to the to tal of the dixnethoxydichlorobenzeno* and th e xnethoxydichlorophenols. The tetrachlorodibentodioxan (TDD) concentration is I read on the right a b scissa. Tbs TDD concentrations are based on the total of tha o th er p roducts (TCP* TCA, DXMEO)and tha TCB. W# have previously shown that th e concentrations of TDD in the TC P is approxim ately equal to *** wang^ntrerian o f TDD ia the T -acid produccd fro m th a T T c P . With this background, c ertain conclusions can be drawn V/ a com parison of Figures 1-4 and a knowledge of tbs past history of TDD production ( F igure 5). Soros of these conclusions are: * 1. During A pril, 1965, production of TDD ro se to an all-tim e high and has rem ained m uch h igher ****** the previous n o rm -c u rr ent<**50 .ppm ., norm al <*>*10 ppm . I . T hs form ation of TDD takes place alm o st en tirely during the bold period. I* 3. At the end of the hold period the TCA content accounts for 2 ,0 -2 . 5% of ths yield. About V* of th is is rem oved by azeo tropic d istillation in the m ethanol s till and recycled with the methanol. c4 $ 4. The TCB is essentially gone at about one hour into the hold period. I 5. Extending th s hi*** p erio d re su lts in in creased TDD form ation (Batch 701). The causa of ths recant in crease in TDD form ation is not obvious from ths data. H ow ever, since TDD form ation has been relativ ely low in the p ast we feel that a detailed lab o rato ry study of the autoclave r* -"ion has a reasonably good chance * for s rcese. Such a study is now in th* * i -~n stage. I /wl Attachm ents a $ a Jw i l - X, I L U ff*