# A tank with its top open to the atmosphere contains liquid methanol (MeOH, molecular weight 32g/mol)

A tank with its top open to the atmosphere
contains liquid methanol (MeOH, molecular weight 32g/mol) at the bottom of the
tank. The tank is maintained at 30C. The diameter of
the cylindrical tank is 1.0 m, the total height of the tank is 3.0 m, and the
liquid level at the bottom of the tank is maintained at 0.5 m. The gas space
inside the tank is stagnant and the MeOH vapors are immediately dispersed once
they exit the tank. At 30C, the vapor
pressure exerted by liquid MeOH is 163 mmHg and at 40C the MeOH vapor
pressure is 265 mmHg. We are concerned that this open tank may be emitting a
»

A tank with its top open to the atmosphere
contains liquid methanol (MeOH, molecular weight 32g/mol) at the bottom of the
tank. The tank is maintained at 30C. The diameter of
the cylindrical tank is 1.0 m, the total height of the tank is 3.0 m, and the
liquid level at the bottom of the tank is maintained at 0.5 m. The gas space
inside the tank is stagnant and the MeOH vapors are immediately dispersed once
they exit the tank. At 30C, the vapor
pressure exerted by liquid MeOH is 163 mmHg and at 40C the MeOH vapor
pressure is 265 mmHg. We are concerned that this open tank may be emitting a
considerable amount of MeOH vapor.

a. What is the emission rate of MeOH vapor
from the tank in units of kg MeOH/day when the tank is at a temperature of 30C? State all
assumptions and boundary conditions.

b. If the temperature of the tank is raised
to 40C, what is
the new methanol emission rate?

»

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