Q3. (30) Crystalline potassium chloride (KCI) is used as a preservative in the canning industry. It...

 

Transcribed Image Text:

Q3. (30) Crystalline potassium chloride (KCI) is used as a preservative in the canning industry. It is obtained from a saturated KCl solution in an open tank. The solution is then cooled to obtain KCI crystals. The details of this production are as follows: The feed material KCI (1500 kg) is added to a solution tank. By adding of water (W), a saturated KCl solution at 87 C is obtained (The solubility value of KCI at 87 C is given below). The saturated solution is then transferred to a second tank to cool down to 17 C to obtain the crystals, C (The solubility value of KCI at 17 C is given below). At the end the cooling process, in addition to the crystals C as the main product, a certain amount of solution (S) is left over. Flow diagram? Overall system boundary? Calculate the amount of crystals produced (C). What should be the minimum capacity of the solution tank (tank volume) to hold saturated solution? Use this solubility information in your calculations: *** Solubility: Max amount of solute dissolves in a solvent; no more solute can be dissolved in the solution at given conditions such as temp., press. This is called saturated solution. Solute concentration is 54/154 =~ 0.35 The solubility of KCI at 87 C: 54 parts KCI per 100 parts of water. The solubility of KCI at 17 C: 35 parts KCI per 100 parts of water. Specific gravity of KCl solution is 1.2 and density of water is 998 kg/m (1st tank) Solute concentration is 35/135 =~ 0.26 Q3. (30) Crystalline potassium chloride (KCI) is used as a preservative in the canning industry. It is obtained from a saturated KCl solution in an open tank. The solution is then cooled to obtain KCI crystals. The details of this production are as follows: The feed material KCI (1500 kg) is added to a solution tank. By adding of water (W), a saturated KCl solution at 87 C is obtained (The solubility value of KCI at 87 C is given below). The saturated solution is then transferred to a second tank to cool down to 17 C to obtain the crystals, C (The solubility value of KCI at 17 C is given below). At the end the cooling process, in addition to the crystals C as the main product, a certain amount of solution (S) is left over. Flow diagram? Overall system boundary? Calculate the amount of crystals produced (C). What should be the minimum capacity of the solution tank (tank volume) to hold saturated solution? Use this solubility information in your calculations: *** Solubility: Max amount of solute dissolves in a solvent; no more solute can be dissolved in the solution at given conditions such as temp., press. This is called saturated solution. Solute concentration is 54/154 =~ 0.35 The solubility of KCI at 87 C: 54 parts KCI per 100 parts of water. The solubility of KCI at 17 C: 35 parts KCI per 100 parts of water. Specific gravity of KCl solution is 1.2 and density of water is 998 kg/m (1st tank) Solute concentration is 35/135 =~ 0.26