Patent ID: 9193601
Filing Date: 2015-11-24
Classification: C01C,C01D

Abstract:
1. A method of recycling of by-products of Merseberg process and Solvay process in an integrated process for the production of soda ash and ammonium sulphate employing brine, ammonia and CO 2 as raw materials, the process comprising the steps of: i. treating the brine with soda ash distiller waste for desulphatation of brine to obtain gypsum; ii. recovering pure salt from desulphated brine and utilizing it in manufacture of soda ash in Solvay process; iii. washing the gypsum obtained in step (i) and reacting it with liquor ammonia and carbon dioxide to obtain CaCO iv. separating CaCO v. washing the CaCO vi. recycling the CO vii. recycling the lime from step (v) with ammonium chloride generated in the Solvay process to recover ammonia and obtain distiller waste as a by-product; viii. recycling the by-product distiller waste containing CaCl ix. recycling ammonia recovered from step (vii) in step (iii).