Patent ID: 6545187
Filing Date: 2003-04-08
Classification: B01J,C07C,C08G

Abstract:
A method of producing a low-particulate dihydric aromatic compound, comprising the steps of:(a) introducing into a desorber column possessing a non-aggregate packing material an adduct of a dihydric aromatic compound and phenol; (b) providing an operating temperature range in the desorber column that is sufficiently high and an operating pressure in the column that is sufficiently low such that the adduct is distilled; (c) discharging from the desorber column a first stream containing substantially all of the phenol; and (d) discharging from the desorber column a second stream containing substantially all of the dihydric aromatic compound; whereby the second stream is substantially free of particulate matter added in the desorber column.