Assertion: phosphoric acid's use | /r/CapableOf | maintain required elevated temperature
Facets:
value: in the digestion stage
type: TEMPORAL
Source sentences:
text: The embodiment of FIGURE 3 and Example III, in turn, is preferred over that of FIGURE 2 and Example II, because the recycle of slurry to the digestion stage provides a control over the temperature and composition of the digestion slurry, and makes economical and efficient use of exothermic reaction heat to maintain the required elevated temperature in the digestion stage.