Process for the separation of phenol from phenol-containing...

Details Process for the separation of phenol from phenol-containing... Process for the separation of phenol from phenol-containing...

2007-11-27

2007-11-27

Eyler, Yvonne (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

Reexamination Certificate

active

11168025

ABSTRACT:
A continuous process for the separation of phenol is disclosed. The process includes (a) feeding a stream of material, produced while preparing bisphenol A by reacting phenol with acetone, into a distillation column containing at least 5 theoretical separation stages, b) distilling-off the phenol as a top product and discharging from the column a bottom product containing secondary components, c) continuously introducing a portion of the bottom product into a dwell-time container operating at process parameters sufficient to cause, in the presence of an acidic catalyst, at least partial isomerization of the secondary components to form an isomerized product and d) introducing the isomerized product to the distillation column. The introducing of the bottom product is at a rate that is more than 30% of the rate of feeding of the stream at temperatures greater than 190° C. and hydrodynamic dwell time of at least 120 minutes.

REFERENCES:
patent: 5785823 (1998-07-01), Meurere et al.
patent: 6133486 (2000-10-01), Maas et al.
patent: 812 815 (1997-12-01), None
patent: 57059926 (1982-04-01), None
Willems et al, “Kinetic Modeling of the Thermal-Cracking of Hydrocarbons. 2. Calculation of Activation Energies”, American Chemical Society, 1998, pp. 1966-1971.
Willems et al (“Kinetic Modeling of the Thermal Cracking of Hydrocarbons. 2. Calculation of Activation Energies”, American Chemical Society, 1998, pp. 1966-1971).

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