Question

A tank containing a chemical of molecular weight 200, leaks the chemical into a containment dike of area 10 ft x 10 ft, filling it to a depth of 2 inches before anyone notices the problem (let’s say it’s the night shift). The vapor pressure of the liquid is 300 mm Hg at the ambient temperature of 75^oF. Estimate:

• The mass transfer coefficient, K, for evaporation of this liquid, assuming K_o for water (MWt =18) is 0.83 cm/sec                    Ans: 0.37 cm/sec
• The evaporation rate of the chemical from the diked area, Q_m in lb/sec   Ans: 0.247
• The concentration of the chemical, C_ppm, in air in the vicinity of the dike, if the ventilation rate, Q_v, is 3000 ft³/min, and there is very little wind, so that k = 0.1.             Ans: 96,000

Answer 1

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