Collect. Czech. Chem. Commun. 1981, 46, 3166-3170

Formation of sodium disulphite by reaction of solid sodium sulphite with gaseous sulphur dioxide

Jiří Vobiš, Karel Mocek and Emerich Erdös

The J. Heyrovský Institute of Physical Chemistry and Electrochemistry, Czechoslovak Academy of Sciences, 121 38 Prague 2


The formation of sodium disulphite in a heterogeneous reaction between solid sodium sulphite and gaseous sulfur dioxide has been investigated in a fixed-bed reactor at temperatures from 40 up to 80 °C in the presence of water vapour. The partial pressure of the sulfur dioxide was in the range of 1.2 to 7.5 kPa and that of the water vapour amounted to 1.0-6.5 kPa. The study has been aimed at finding optimum conditions for the formation of the disulphite according to the final degree of conversion. It has been found that the final degree of conversion depends primarily on the content of water vapour in the gas phase and on the temperature, the reactivity of the sodium sulphite being significantly affected by the way of its preparation.