Method of preparation of anhydrous sodium carbonate and sodium carbonate anhydrous obtained by this

摘要

P the invention relates to a process for the preparation of sodium carbonate anhydrous / p & & p & this process comprises preparing a suspension of sodium bicarbonate in an aqueous solution of sodium carbonate and the decomposition of sodium bicarbonate in the suspension by placing in contact against - current of the said suspension in the conveying by a pipe 14 to the top of a turn of the decomposition 10 and by bringing the steam under pressure by a conduit 16 at the bottom of said tower of decomposition 10 to temperatures above 150°C, for which is obtained in the anhydrous sodium carbonate in the form of a suspension in its saturated aqueous solution, by the pipe 20. / p & & p & this process makes it possible to prepare the ashes of dense soda having a high purity and particle size and / p