Utilization of the post-filtration lye from the SCS method of soda production

Mieczysław Trypuć,Urszula Kiełkowska,Krzysztof Mazurek,Sebastian Drużyński

doi:10.2478/v10026-007-0091-y

Abstract

Utilization of the post-filtration lye from the SCS method of soda production The mutual solubility of salts in the NaVO3-NaNO3-H2O system was investigated at 293 - 323 K temperature range by the method of isothermal saturation of solutions. A fragment of the solubility polytherm for that system was plotted, based on the obtained data. The investigated system is a part of the quaternary NH4NO3-NaVO3-NH4VO3-NaNO3 system, and it is necessary for plotting the solubility isotherm as a planar projection according to Janecke, since it defines one edge of its square. Knowledge of the isotherm for that quaternary system is necessary to determine the optimal utilization conditions for the post-filtration lye, formed during the soda production from NaNO3 by the Solvay method, using NaVO3.

Highlights

The SCS method (Soda-Chlorine-Saltpetre) is a modification of the classic Solvay method of soda production[1, 2].Generally, it is based on the carbonization of the ammoniated NaNO3 brine
Sodium nitrate required for that process is obtained in a reaction of the oxidation of solid sodium chloride with nitric acid according to equation 3
The presence of chlorides catalyzing the uncontrolled decomposition of ammonium nitrate[4, 5], is especially disadvantageous

Summary

Introduction

The SCS method (Soda-Chlorine-Saltpetre) is a modification of the classic Solvay method of soda production[1, 2]. It is based on the carbonization of the ammoniated NaNO3 brine. Sodium bicarbonate obtained in that process is subjected to calcination[1,2,3] (equations 1 and 2). Sodium nitrate required for that process is obtained in a reaction of the oxidation of solid sodium chloride with nitric acid according to equation 3. The presence of chlorides catalyzing the uncontrolled decomposition of ammonium nitrate[4, 5], is especially disadvantageous

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