Assertion: formic acid | /r/AtLocation | withdrawn vapors
Facets:
Source sentences:
text: With about 60 rectification trays and with the distillation being conducted at essentially atmospheric pressure, it is recommended that there be employed as reflux into the head of the azeotroping column at least about 10 to 12, preferably 12, parts of formicacid for each part of formic acid withdrawn from the distillate receiver as product, together with at least enough of the entrainer that the vapors withdrawn from the head of the column contain at least about 10 part of the entrainer by weight for each part of formic acid contained in the withdrawn vapors (i.e., enough entrainer to satisfy the entrainer-formic acid azeotrope).