Assertion: dilute phosphoric acid | /r/CapableOf | concentrate at vacuum
Facets:
value: thereafter
type: TEMPORAL
value: within a specific range
type: OTHER
Source sentences:
text: Broadly, this invention is a result of the discovery that crude dilute phosphoric acid prepared by the wet process must first be treated to remove the fluoride ions and thereafter concentrated at a vacuum within a specific range if pure concentrated acid is to be ultimately obtained.