Assertion: hydrogen fluoride | /r/HasProperty | removed
Facets:
value: overhead
type: LOCATION
Source sentences:
text: In one embodiment my invenf tion comprises an improved process for the rei generation of a used hydrogen fluoride catalyst which includes the following steps: subjecting the used' hydrogen fluoride catalyst to a fractionation zone wherein substantially anhydrous hydrogen fluoride and light hydrocarbons are "i removed overhead, withdrawing a bottom prodi" uct comprising heavy viscous acid-soluble organic materials together with a water-'hydrogen fluoride mixture, withdrawing an intermediate side stream from said fractionation zone comprising light acid-soluble organic material together with some hydrogen fluoride and light hydrocarbons, passing the intermediate stream to a settler for removal of entrained heavymaterials, passing the light acid-soluble organic material from thersettler to a stripping column where light hydrocarbons and hydrogen fluoride are removed overhead and returned to the fractionation zone, while stripped light acid-soluble org.,y
text: The hydrogen fluoride and light hydrocarbons are removed from the top of the fractionating column which is maintained at a temperature of about 100 F., and at a pressure of about twentyseven pounds per square inch absolute.
text: so obtained is heated in a stripping columnat approximately 400 to 500 F., whereby hydrogen fluoride is liberated and is removed .as an overhead fraction.