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B:\CYCLOPUR.DOC <br /> By calculating the dew points for benzene and gasoline at the 43-F <br /> r the lower temperature limit caused by the freezing point of <br /> benzene, and at the concentrations of the compounds <br /> estimates of the pressures need to condense out benzene sand <br /> gasoline can be made. <br /> The amount of vapor that can be in air is found by the following <br /> formula <br /> C =VPC/P <br /> C = Concentration vapor <br /> VPc Q vapor pressure compound <br /> P e Preesure <br /> i-` The dew <br /> nce is that <br /> Concentration point <br /> inoairaexceeds athe ConcentrationiVapor;nt at therh the <br /> the compound will condense out. afore, <br /> The concentration of <br /> formula the vapor can be found by the following <br /> C = mg/1 "` 22.4 1/mole / MW mg <br /> MW = the molecular weight <br /> 22.4 volume ofone mole of gas at standard temperature and <br /> pressure. <br /> Solving for P <br /> P=VP/(mg/1*22.4)*MW <br /> COMPOUND VP MW mg CONCENTRATION Pressure <br /> at 43-F mg/1 STP <br /> mm/Hg mm/Hg atmospheres <br /> Benzene 35 78110 ,72 <br /> Gasoline 211.9 90900 174353 229.4 <br /> Gasoline 211.9 90900 3131.44 760 23'00 37386 49.2 <br /> Gasoline 82 @ OAF 90900 23.00 1.D <br /> 14467 19.0 <br /> At the above ratios condensation would begin . <br /> 1131.4 mg/1 = 27.9 $ by volume Gasoline Vapor. <br /> The above indicates that at normal concentrations found during <br /> vapor extraction of gasoline soil contamination the Cyclo Purge <br /> should be ineffective at removing gasoline vapors. <br /> i <br /> This discussion of -vapors will <br /> -- — --- - -respond as ideal gasses and should only be used as an indication <br /> of the probable responses of the system; <br />