Cyclohexane (C6H12) is being used in a workplace 21 x 45 x 12 ft. In an 8-hr wor

Question

Cyclohexane (C6H12) is being used in a workplace 21 x 45 x 12 ft. In an 8-hr workshift, 4.3 gallons of C6H12 is evaporated steadily. There are 2.1 air changes per hour in this workplace. For cyclohexane: MW = 84 g-mol; d = 0.779 g/mL; TLV = 300 ppm; LEL = 1.3%; UEL = 8.4%. Also: 1 gallon = 3.785 L, 1 ft3 = 28.32 L.

What is the solvent evaporation rate in L/min at 25 oC and 760 mmHg?

a.         7.69                             b.         9.62

c.         3690                            d.         None of the above

Explanation / Answer

For cyclohexane volume 4.3 gallons = 4.3 x 3.8 L

evaporation rate in a workplace volume of 21 x 45 x 12 ft

in time 8 x 60 min would be,

a. 7.69 L/min

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