Method of separating phenol from highly concentrated phenol solu

Details Method of separating phenol from highly concentrated phenol solu Method of separating phenol from highly concentrated phenol solu

1996-01-29

1997-09-30

Rotman, Alan L.

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

Organic compounds

Oxygen containing

568754, C07C 3770

Patent

active

056727755

ABSTRACT:
The present invention relates to a method of separating and purifying phenol in a simple and economical manner, by employing a step of adding high pressure carbon dioxide to the aqueous phenol solution to form a solid clathrate of phenol. According to the method of separating phenol of the present invention, phenol can be separated from the highly concentrated phenol solution without employing solvent or post-treatment step, finally to give 100 mole % of a solid phenol and 0.6 mole % of an aqueous phenol solution by employing only one step. Moreover, since the method is carried out at the temperature of below room temperature without excess energy consumption, the separation of phenol can be made in a simple and economical manner.

REFERENCES:
Ghonasgi, D. et al. Measurement and Modeling of Supercritical Carbon Dioxide Extration of Phenol from Water, The Journal of Supercritical Fluids, 4:53-59 (1991).
Gupta, S. et al. Supercritical Carbon Dioxide Extraction . . . , The Journal of Supercritical Fluids, 4:181-185 (1991).
Roop, Robert K. and Akgerman, Aydin Entrainer Effect for Supercritical Extraction of Phenol from Water, Ind.Eng.Chem.Res., 28(10):1542-1546 (1989).
Ghonasgi, D. et al. Supercritical CO.sub.2 Extraction of Organic Contaminants from Aqueous Streams, AIChE Journal, 37(6):944-950 (1991).
Roop et al. Supercritical Extraction of Pollutants from Water and Soil, ACS Symposium Series of Supercritical Fluid Science and Technology, 468-476 (1989).

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