Document dnRaoNDwrxQDwm6x62a7e0gdB

ALLIED CHEMICAL CORPORATION MEMORANDUM ALLIED CMic :!r'n,i , L. ; * / 1 ; March 1, 1974 To : Subject: Mr. J. M. Quinn Air Monitoring Techniques for Vinyl Chloride Monomer I refer to Mr. Cornell's memo dated February 13, 1974 which reports on reconnaissance obs ervations utilizing the Century analyzer. From the standpoint of o pr future negotiating position with governmental agencies, the use of the statement "background readings of 10 ppm" is disturbing, If this is indeed a background concentration of 10 ppm vinyl chlor de identified as such, I am certain that this exposure level will Tjjecome unacceptable. On the other hand, if this is a zero shift attributable to the instrument noise or the presence of interferi ng materials, this fact also needs to be clearly established in the record. In open air plants our experience is that the concentre tions of vapors on the upwind vector from emission sources is ge ne rally nondetectable at the 1 ppm level unless there is some o th er emission source across the fence line which contributes to our readings. Because of the sensitivity of this point, I would appreciate a prompt response to the techp ical questions raised and suggest that, in the future, we more c early indicate the precise meaning of our observations. i0 s w. . Ferguson WSF:mn cc : Mr. A . -T Mr. E. IV Mr. R. H vou Frank Callahan Sand AS I 00023484 r, m. i r;:: Table 3.1. PHYSICAL CHARACTERISTICS OF VINYL CHLORIDE5 Formula Molecular we Ight Vapor pressure 21.1C Specific volume 21.1C Boiling point 1 atm Freezing point 1 atm Specific gravity, gas 15C., 1 atm (air = 1) Density, liquid - 20C Critical temperature Critical pressure Critical density Latent heat of vaporization b.p Latent heat of fusion m.p Specific heat Liquid 20C Gas 2o C., 1 atm., Cp Viscosity, 1iquid -20C FIammable 1imits in air Autoignition temperature Dielectric constant 17.2C Surface tension -20C Refractive index, n -1r.0 Solubility in water 25C, 1 atrn C H 2 C H C1 62.50 2 34 ps ig (2.4 kg/cm gauge) 6.2 cu ft/lb (387.0 ml/g) 7.0F (-13.9C) -255.5F (-159.7C) 2.15 0.9834 317.1F (158.4C) 774.7 ps ia (2.7 atm.) (54.4 kg/cm absolute) 0.370 g/ml 79.84 cal/g 18.14 cal/g 0.38 cal/(g) (C) 0.205 cal/(g)(C) 0.278 centistoke (0.2734 centipoise) 4.0-22.0 percent (by volume) 881.6F (472C) 6.26 22.27 dynes/c.m 1 .4046 0.11 g 100 g water VCM is soluble iri alcohol, very soluble in ether and carbon tetrachloride. Synonyms: cloroethene, chloroethylene Conversion factors at 25C and 760 mm Hg. 1 ppm = 2,56 mg/mJ 1 mg/liter = 391 ppm ASI 00023485