The solubility of sodium sulfate is 40 parts Na 2 SO 4 per 100 parts of water at 30°C, and 13.5 parts at 15°C. The latent heat of crystallization (liberated when crystals form) is 18,000 g-cal per...

The solubility of sodium sulfate is 40 parts Na₂SO₄
per 100 parts of water at 30°C, and 13.5 parts at 15°C. The latent heat of crystallization (liberated when crystals form) is 18,000 g-cal per gmol Na₂SO₄. Glauber’s salt (Na₂SO₄•10H₂O) is to be made in a Swenson-Walker
crystallizer by cooling a solution, saturated at 30°C, to 15°C. Cooling water enters at 10°C and leaves at 20°C. The overall heat transfer coefficient in the crystallizer is 25 BTU/h•ft²•°F and each foot of crystallizer has 3 sq ft of cooling surface. How many 10-ft units of crystallizer will be required to produce 1 ton/h of Glauber’s Salt.