Propylene exposion properties

Olefin selectivities also decrease with increasing bed residence time and chain size on Ru catalysts (4,14). For example, propylene selectivity decreases with increasing bed residence time without a corresponding increase in propane selectivity, leading to a net decrease in the fraction of the converted CO that appears as C3 molecules (Fig. 7b). Readsorbed olefins initiate chains that continue to grow and ultimately desorb as larger olefins or paraffins, ( alitative trends are similar on all supports and on both Ru and Co catalysts. The selectivity details depend on the support physical structure, on the density of exposed surface metal atoms, and on the intrinsic readsorption properties (j8r) of Co and Ru surfaces. 

Properties Colorless to pale yel. liq., fruity odor misc. with alcohol, fixed oils si. sol. in propylene glycol insol. in water m.w. 158.27 dens. 0.851-0.857 b.p. 150 C flash pt. 58 C ref. index 1.407 Toxicology LD50 (oral, rat) 8200 mg/kg, (skin, rabbit) > 5 g/kg low toxicity by ing. and skin contact skin irritant TSCA listed Precaution Flamm. when exposed to heat, flames, sparks, oxidizers Hazardous Decomp. Prods. Heated to decomp, emits acrid smoke and fumes NFPA Health 0... 

Definition Obtained by esterification of isovaleric acid with ethyl alcohol in presence of cone. H2SO4 Empirical C7H14O2 Formula (CH3)2CHCH2COOC2H5 Properties Colorless oily liq., apple odor sol. in propylene glycol si. sol. in water 135 C misc. with alcohol, fixed oils, benzene, ether m.w. 130.21 dens. 0.868 (20/20 C) b.p. 135 C m.p. -99 C flash pt. 77 F ref. index 1.395-1.399 Toxicology LD50 (oral, rabbit) 7031 mg/kg, (IP, rat) 1200 mg/kg mod. toxic by IP route mildly toxic by ing. skin irritant TSCA listed Precaution Flamm. liq. when exposed to heat, flame, or sparks... 

The materials examined were high and low density polyethylene, silvered fluorinated ethylene propylene teflon blanket material, polysulphone matrix resin/graphite fibre reinforced composites, poly(methyl methacrylate) and silicones [326, 450,1326, 2314]. Long term exposed polymeric samples show loss of surface integrity and surface erosion. The radiation combines with atomic oxygen to initiate chain scission and crosslinking, both of which greatly affect the polymers structural properties. 

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