Assertion: crude oil's sulfur | /r/HasProperty | removed
Facets:
value: from crude oil
type: OTHER
value: during refining
type: TEMPORAL
value: prior to
type: TEMPORAL
Source sentences:
text: The excess sulfur is removed from crude oil prior to refining, because sulfur oxides released into the atmosphere during the combustion of oil would constitute a major pollutant, and they also act as a significant corrosive agent in and on oil processing equipment.
text: Excess sulfur is removed from crude oil during refining, because sulfur oxides released into the atmosphere during combustion of oil are a major pollutant.