Sodium
bi-sulphite.
=
M.CH
OH
SO3
Na.
Double compound.
(3) The removal of a portion of the constituents in combination with the base, i.e. with expulsion of sulphurous acid.
The verification of these views has been afforded in the course of an investigation of the bye-products from the Ekman process, undertaken by the authors for Messrs. Thomson, Bonar & Co., the proprietors of the patent.
As the various bisulphite processes differ chiefly in their working details, the essential feature of the employment of a solution of sulphurous acid, combined with a certain amount of base, being common to them all, it will not be necessary to do more than examine one or two typical cases. We shall select those of Ekman and Partington, the latter being based upon Francke’s patent, with certain modifications and additions.