About: http://webisa.webdatacommons.org/438263694

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Once all impurities except for carbon dioxide, nitrogen dioxide, ammonia, and moisture are reduced to less than designated specifications, the cryogenic distillation is taken off line from the purification process.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com