In Figure 3 we have illustrated a process in which NaHCO3 is fed to a combined drying and calcining unit in which Na2CO3,H2O and CO2 are produced. The partial pressure of water vapour in the entering air stream is equiv 12.7mmHg and the system operates at one atmosphere. The exit gas leaves at 300F and a relative humidity of 5%. The NaHCO3 is 70% solids and 30% water when fed to the system The Na2CO3 leaves with a water content of 3%. To improve the character of the solids entering the system, 50% of the dry material is moistened to produce Na2CO3H2O and then recycled. Calculate the following quantities per ton of Na2CO3 product: 1. mass of wet NaHCO3 fed at 30% water 2. mass of water fed to moisten the recycle stream 3. cubic feet of dry air fed at 1atm and 273K 4. total volume of exit gas at 1atm and 300F In Figure 3 we have illustrated a process in which NaHCO3 is fed to a combined drying and calcining unit in which Na2CO3,H2O and CO2 are produced. The partial pressure of water vapour in the entering air stream is equiv 12.7mmHg and the system operates at one atmosphere. The exit gas leaves at 300F and a relative humidity of 5%. The NaHCO3 is 70% solids and 30% water when fed to the system The Na2CO3 leaves with a water content of 3%. To improve the character of the solids entering the system, 50% of the dry material is moistened to produce Na2CO3H2O and then recycled. Calculate the following quantities per ton of Na2CO3 product: 1. mass of wet NaHCO3 fed at 30% water 2. mass of water fed to moisten the recycle stream 3. cubic feet of dry air fed at 1atm and 273K 4. total volume of exit gas at 1atm and 300F