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Class Information
Number: 568/748
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Oxygen containing (e.g., perchlorylbenzene, etc.) > Hydroxy containing (h of -oh may be replaced by a group ia or iia light metal) > Benzene ring containing > Phenols (h of -oh may be replaced by a group ia or iia light metal) > Additional ring containing > The additional ring is six-membered > The additional ring is benzene > Rings bonded directly to each other > Purification or recovery
Description: Processes under 747 which include separating the compound from impurities or from the reaction mixture.

Patents under this class:

Patent Number Title Of Patent Date Issued
5847234 Process for the preparation of 4-hydroxybiphenyl Dec. 8, 1998
5510543 Removal and neutralization of acid catalyst from products of cumene hydroperoxide cleavage Apr. 23, 1996
5304689 Stabilization of color in production of paracumylphenol using hypophosphorous acid Apr. 19, 1994
5254750 Removal of guaiacol from cresylic acid by heating with a strong base Oct. 19, 1993
5196605 Process for the preparation of pure 4,4'-dihydroxybiphenyl Mar. 23, 1993
5185475 Process for preparing paracumylphenol Feb. 9, 1993
5124490 Removal of acids from phenol using anionic exchange resins Jun. 23, 1992
5087768 Process for the purification of dihydroxybiphenyls Feb. 11, 1992
4992599 Novel purification process Feb. 12, 1991
4766254 Method for maximizing yield and purity of bisphenol A Aug. 23, 1988
4740635 Process for crystallizing bisphenol-A Apr. 26, 1988
4740634 Process for crystallizing bisphenol-A Apr. 26, 1988
4720596 Process for removing phenols from water Jan. 19, 1988
4695410 Recovery of phenol from aqueous solution Sep. 22, 1987
4533764 Purification of bisphenols by removing residual solvent Aug. 6, 1985
4529823 Purification of bisphenol-A Jul. 16, 1985
4469561 Azeotropic recovery of BPA and phenol from aqueous effluent streams Sep. 4, 1984
4092364 Caustic hydrolysis of chlorobenzene to diphenyl oxide May. 30, 1978
3997615 Process for recovery of ortho-phenylphenol Dec. 14, 1976
3981929 Method of separating methylolphenols from solutions Sep. 21, 1976
3974084 Process for the manufacture of anhydrous alkali metal arylate solutions and separation of the arylates from alkali metal sulfite Aug. 10, 1976

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