Document 5kO3MxzkEadXeVJQoJr2xg39J

DO 0 9 ? 5 0 9 OONFTDFIMTTAI CANOFILED AUG 19 1993 Du .. - . i t rttNG TO THIS PACKAGE SEE OFFICE PROFESSIONAL!!  VI ^ -- C& po\ P?eo Vi/ ^ THE DOW CHEEMMICCAAL COMPANY MIDLAND, Michigan January 4, 1967 n. G. Vaughn Safety Department LOUISIANA DIVISION Dear Bob: I am including with this letter a summary of the concentrations of vinyl chloride found at various locations in the vinyl plant and laboratory. These concentrations are all very low, as we expected. You remember that we did these measurements to check on the changes of procedure that had been worked out in the lab after our previous series of measurements. It would appear that putting the operation where vinyl is allowed to bubble through the solution, I believe this is an acid determination, in the hood was quite effective in cleaning up the air in the laboratory. You will also notice that I am reporting the analysis of these same samples for the six materials which we analyzed in the glycol plant. This analysis was more or less run by mistake since our technician didn't understand that these samples were from a different block. I am very puzzled by the results you will see here. Indication is that there is a fair amount of propylene dichloride, some ethylene dichloride, and even some propylene chlorohydrin in these samples. Although it is not impossible that these materials could reach the vinyl block under suitable circumstances of wind speed and direction, I didn't expect these results. I wonder if you could discuss these puzzling results with suitable people and see if there might be some explanation. One possibility that occurs to me is that there may be something in the vinyl block that comes out on VPC at about the same point as the propylene dichloride. If you have any candidates as a result of your conversation, send an ounce of each along and we will try them out on the column that we used for this analysis. Best wishes for the New Year. Biochemical Research Laboratory 1701 Building HRHtsjl Enc. DO 09?510 CONFIDENTIAL VINYL BLOCK l *i **. f* Sample Number Sample Description Concentration, parts per million* VC1 EO PO PDC EDC ECH PCH XX Breathing zone while filling flasks on 0.4 laboratory bench. Pour samples. XXI Sample In area In front of the hood. Samples bubbling through solution in the hood. 0.6 XXII Making up ethylene dichloride composite. XXIII Breathing zone while taking Initial boiling point on C5 Bottoms in the control room. 0.7 0.2 XXIV Grab sample while blowing flask dry. <0.2 5-3 9*6 6.0 21.9 6.6 100 UJ 00 ' : 2.8 r> oa ~7' s_J -i o z? rn \ i 2-8 f H-( -V 'ji i-J- I> *VC1 (Vinyl chloride) EO (Ethylene oxide) PO (Propylene oxide) PDC (Propylene dichloride) EDC (Ethylene dichloride) ECH (Ethylene chlorohydrin) PCH (Propylene chlorohydrin) Industrial Hygiene Standard 50 ppm (Dow) 50 ppm 100 ppm 75 ppm 50 ppm 5 ppm 5-10 ppm