In the sulphite process the chips are then delivered into the digesters shown in Fig. 128, which are supplied with sulphurous acid generated in a plant shown in Fig. 129. Edward W. Byrn.十九世纪发明进展.
The latter and other acid processes were not successful until cement-lined digesters were invented to withstand their corroding action. 威廉·亨利·杜利特.世纪发明.