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Class Information
Number: 568/750
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) > Purification or recovery > From mixture of phenols
Description: Processes wherein the phenols are separated from a mixture of two or more phenols.

Sub-classes under this class:

Class Number Class Name Patents
568/751 Plural phenols recovered separately 43

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8648218 Method for preparing phenolic compounds Feb. 11, 2014
8628849 Method for preparing purified pyrocatechol Jan. 14, 2014
8283501 Optically active 2,2'-biphenol derivative and production method of same Oct. 9, 2012
8247620 Production of highly pure hydroquinone Aug. 21, 2012
8236992 Preparation of purified hydroquinone Aug. 7, 2012
8236993 Process and apparatus for the production of hydroxytyrosol containing extract from olives and solids containing residues of olive oil extraction Aug. 7, 2012
8071817 Preparation of purified hydroquinone and forming of same Dec. 6, 2011
7541417 Process for the purification of dihydric phenols Jun. 2, 2009
7528210 Method of purification of dihydric phenols May. 5, 2009
7067704 Process for purifying bisphenol-a Jun. 27, 2006
6600004 Method of preparing polyestercarbonates Jul. 29, 2003
6576801 Process for the neutralization of residual acid species in crude dihydric phenols Jun. 10, 2003
6414106 Process for the neutralization of residual acid species in crude dihydric phenols Jul. 2, 2002
6258901 Process for producing lightly colored p-vinylphenol polymer Jul. 10, 2001
6184367 Process for the production of 4-aryl-2 butanols from Taxus wallichiana Feb. 6, 2001
6150566 Separation and purification method of xylenol isomer Nov. 21, 2000
6120653 Separation and purification method of t-butyl-methylphenol isomer Sep. 19, 2000
6066767 Method of purifying cumene hydroperoxide decomposition products from hydroxyacetone and from other carbonyls May. 23, 2000
6025530 Phenol tar cracking process Feb. 15, 2000
5750009 Method for purifying natural cresylic acid mixtures May. 12, 1998
5744654 Recovery of para-ethylphenol Apr. 28, 1998
5705039 Process for purifying a 2,6-dialkylphenol Jan. 6, 1998
5696300 Propofol purification Dec. 9, 1997
5679223 Method for separating and purifying catechol mixtures Oct. 21, 1997
5672774 Phenol tar processing method Sep. 30, 1997
5589598 Process of purification of 2,6-diisopropylphenol Dec. 31, 1996
5491268 Process for removal of acidic compounds from phenol process streams Feb. 13, 1996
5254750 Removal of guaiacol from cresylic acid by heating with a strong base Oct. 19, 1993
5202505 Purification of hydroxyphenyl alkanes Apr. 13, 1993
5177269 Removal of guaiacol from cresylic acid feedstreams by heating with a strong acid Jan. 5, 1993
5171895 Removal of guaiacol from cresylic acid feedstreams Dec. 15, 1992
5149887 Separation of alkyl-substituted phenolic isomers with barium-potassium exchanged zeolitic adsorbent Sep. 22, 1992
4942265 Process for preparing 2,2-bis(4-hydroxyphenyl)propane of high purity Jul. 17, 1990
4851590 Method of purifying 2,4-xylenol Jul. 25, 1989
4847435 Process for the recovery of high-purity m-ethylphenol Jul. 11, 1989
4827049 Process for the separation of dihydroxybenzene isomers May. 2, 1989
4795829 Process for separating higher molecular weight constituents from phenol polymers Jan. 3, 1989
4769499 Process for separation of substituted benzene isomers Sep. 6, 1988
4605790 Phenol from coal and biomass Aug. 12, 1986
4575568 Removal of phenols from water Mar. 11, 1986
4571441 Process for separation of substituted benzene isomers Feb. 18, 1986
4514574 Process for separating isomeric mixtures Apr. 30, 1985
4491677 Isomer separation Jan. 1, 1985
4487987 Method of decolorizing mixtures of aminoethylpiperazine, a polyoxypropylenediamine and alkylphenols with N,N-diethylhydroxylamine Dec. 11, 1984
4447654 Process for separating nitrated phenolic compounds from other phenolic compounds May. 8, 1984
4447658 Process for separating 3,5-xylenol or 3,4-xylenol from other polymethylated phenolic compounds May. 8, 1984
4433181 Process for recovering a crystallization medium Feb. 21, 1984
4431846 Reduction of o-ethylphenol in m,p-cresol by preferential t-butylation Feb. 14, 1984
4429169 Process for separating isopropylated m-cresols Jan. 31, 1984
4429168 Process for separating chlorinated phenols Jan. 31, 1984

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