Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound
Patent
1996-05-28
1998-05-12
Manoharan, Virginia
Distillation: processes, separatory
Adding material to distilland except water or steam per se
Organic compound
203 14, 203 78, 568750, B01D 340, C07C 3774
Patent
active
057500096
ABSTRACT:
A process for the purification of natural cresylic acid feedstocks which are first depitched. The depitched feedstock is extractively distilled with a polyhydric alcohol, preferably triethylene glycol, to remove virtually all neutral oil species which are indigenous to the phenol and cresol boiling ranges, most of the neutral oil species in the 2,4-2,5-xylenol boiling range, and a significant portion of the neutral oil species of the high boiling xylenol fraction (including of 2,3-xylenol, 3,5-xylenol, para-ethylphenol, meta-ethylphenol, 3,4-xylenol, and numerous C.sub.9 phenols). This process is also capable of removing tar bases such as pyridine and its alkyl homologues. This invention is capable of providing a cresylic acid mixture from which it is possible to fractionate phenol, as an overhead product, having only 30 to 60 ppm of neutral oil and negligible tar base content, and providing dephenolized cresylic acid, as a bottoms product, having less than 10% of the neutral oil and less than 20% of the tar bases as would be provided by the same feedstock, if left untreated.
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English Translation of German Patent Document 204 474.
Baker Gene G.
Duncan David H.
Kuhn Alfred K.
Maas Dana J.
Mohl Kevin M.
Dakota Gasification Company
Manoharan Virginia
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