Assertion: calcium carbide | /r/ObjectUse | used as the starting material
Facets:
value: for the production of acetylene
type: PURPOSE
value: in locations
type: LOCATION
Source sentences:
text: In locations where there is a shortage of petroleum, calcium carbide is used as the starting material for the production of acetylene, which, in turn, can be used as a building block for a range of organic chemicals, such as vinyl acetate, acetaldehyde and acetic acid.