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6.Vinyl chloride, a suspected carcinogen, evaporates into the air at a rate of 7.5 g/min.

If the permissible exposure limit (PEL) is 1 ppm, what flow rate of air will be

necessary to achieve the PEL utilizing dilution ventilation? Assuming there is

insufficient mixing of the vinyl chloride and the dilution air, a safety factor of 5 or

more needs to be used to assure proper dilution. Under these conditions what flow

rate is necessary?

7. Chemical cartridge respirators are personal protective devices used to adsorb harmful

vapors and gases. A performance analysis of such respirators is similar to that

used in a fixed bed adsorber. The generalized correlation of adsorption potential shows that the logarithm of the amount adsorbed is linear with the function T/V

[log&,/f)] where T is the temperature in K, V is the molar volume of liquid at the

normal boiling point in cm3/g mole, f, is the saturated fugacity (approximate as the

vapor pressure), and f is the fugacity of the vapor (approximate as the partial

pressure). Data for the adsorption of dichloropropane on a selected charcoal are as

follows:

Amount adsorbed T/Vtlog,o(f,/f)l

(cm&/l00 gcharcoaJ (units as given)

1 21

10 11

ff a respirator contains 100 g of this charcoal and breakthrough occurs when 82

percent of the adsorbent is saturated, how long can the respirator be used in a

dichloropropane concentration of 750 ppm when the temperature is 80"~? Assume

that the flow rate of contaminated air through the adsorbent is 45 l/min. The molar

volume of the dichloropropane may be assumed to be 100 cm3/g mole.

8. Determine which of the following liquids used in the laboratory could form flammable

air-vapor mixtures if spilled in a storage cabinet and allowed to reach equilibrium.

acetone

benzene

carbon disulfide

ethyl ether

methyl alcohol

n-pentane

What type of fire extinguishers would be appropriate if a small spill is ignited? Note

that if equilibrium is not attained, the vapor concentrations will be lower than

calculated and a flammable air-vapor mixture could be present.

9)Estimate the flash-point of acetone and compare it with the experimental value given

in the literature. Hint: Start with the basic principle that the fugacity in the vapor

phase must equal that in the liquid phase. The lower flammable limit for acetone is 2.55 percent by volume.