Barium carbonate is commercially important as a basis for the manufacture of other barium compounds. In its manufacture, barium sulfide is first prepared by heating the natural sulfate, barytes, with carbon. The barium sulfide is extracted from this mass with water and the solution treated with sodium carbonate to precipitate the carbonate of barium. In the operation of such a process it is found that the solution of barium sulfide formed contains also some calcium sulfide, originating from impurities in the barytes. The solution is treated with sodium carbonate, and the precipitated mass of calcium and barium carbonates is filtered off. It is found that 16.45lb of dry precipitate are removed from each 100lb of filtrate collected. The analysis of the precipitate is: CaCO3 9.9%; BaCO3 90.1% The analysis of the filtrate is found to be: Na2S 6.85%; Na2CO3 2.25%; H2O 90.9% The sodium carbonate for the precipitation was added in the form of anhydrous soda ash which contained calcium carbonate as an impurity. (a) Determine the percentage excess sodium carbonate used above that required to precipitate the BaS and CaS, (b) Calculate the composition of the original solution of barium and calcium sulfides, (c) Calculate the composition of the dry soda ash used in the precipitation

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Barium carbonate is commercially important as a basis for the manufacture of other barium compounds. In its manufacture, barium sulfide is first prepared by heating the natural sulfate, barytes, with carbon. The barium sulfide is extracted from this mass with water and the solution treated with sodium carbonate to precipitate the carbonate of barium. In the operation of such a process it is found that the solution of barium sulfide formed contains also some calcium sulfide, originating from impurities in the barytes. The solution is treated with sodium carbonate, and the precipitated mass of calcium and barium carbonates is filtered off. It is found that 16.45lb of dry precipitate are removed from each 100lb of filtrate collected. The analysis of the precipitate is: CaCO3 9.9%; BaCO3 90.1% The analysis of the filtrate is found to be: Na2S 6.85%; Na2CO3 2.25%; H2O 90.9% The sodium carbonate for the precipitation was added in the form of anhydrous soda ash which contained calcium carbonate as an impurity. (a) Determine the percentage excess sodium carbonate used above that required to precipitate the BaS and CaS, (b) Calculate the composition of the original solution of barium and calcium sulfides, (c) Calculate the composition of the dry soda ash used in the precipitation

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