BaCO3, which is water insoluble, is to be made by precipitation from a solution containing 120,000 kg/day of water and 40,000 kg/day of BaS, with a stoichiometric amount of solid Na2CO3. The reaction, which produces a byproduct of watersoluble Na2S, will be carried out in a continuous, countercurrent system of five thickeners. Complete reaction will take place in the first thickener, which will be fed solid Na2CO3, an aqueous solution of BaS, and overflow from the second thickener. Sufficient fresh water will enter the last thickener so that overflow from the first thickener will be 10 wt% Na2S, assuming the underflow from each thickener contains two parts of water per one part of BaCO3 by weight. (a) Draw a process flow diagram and label it with all given information. (b) Determine the kg/day of Na2CO3 required and kg/day of BaCO3 and Na2S produced. (c) Determine the kg/day of fresh water needed, wt% of Na2S in the liquid portion of the underflow that leaves each thickener, and kg/day of Na2S that will remain with the BaCO3 product after it is dried
BaCO3, which is water insoluble, is to be made by precipitation from a solution containing 120,000 kg/day of water and 40,000 kg/day of BaS, with a stoichiometric amount of solid Na2CO3. The reaction, which produces a byproduct of watersoluble Na2S, will be carried out in a continuous, countercurrent system of five thickeners. Complete reaction will take place in the first thickener, which will be fed solid Na2CO3, an aqueous solution of BaS, and overflow from the second thickener. Sufficient fresh water will enter the last thickener so that overflow from the first thickener will be 10 wt% Na2S, assuming the underflow from each thickener contains two parts of water per one part of BaCO3 by weight. (a) Draw a process flow diagram and label it with all given information. (b) Determine the kg/day of Na2CO3 required and kg/day of BaCO3 and Na2S produced. (c) Determine the kg/day of fresh water needed, wt% of Na2S in the liquid portion of the underflow that leaves each thickener, and kg/day of Na2S that will remain with the BaCO3 product after it is dried
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