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Class Information
Number: 568/724
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) > Polyphenols > Two phenols bonded directly to the same carbon > Identical phenols > Purification or recovery
Description: Processes which include separating the compound from impurities or from the reaction mixture.










Sub-classes under this class:

Class Number Class Name Patents
568/725 Halogen containing 32


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8432544 Method for detecting BPA by surface enhanced Raman spectroscopy Apr. 30, 2013
8431749 Recovery of phenol and acetone from bisphenol-A streams Apr. 30, 2013
8044248 Treatment of bisphenol-A residue streams Oct. 25, 2011
8039679 Bisphenol-A plant yield enhancement Oct. 18, 2011
7902408 BPA process improvement Mar. 8, 2011
7763757 Crystallization processes for producing bisphenols Jul. 27, 2010
7750057 Method for obtaining alkali metal salt aqueous solution of aromatic dihydroxy compound from waste aromatic polycarbonate Jul. 6, 2010
RE41290 Process for purifying phenol-containing bisphenol A Apr. 27, 2010
7666977 Poly(carbonate-co-urea) copolymers and melt transesterification method of preparing these copolymers Feb. 23, 2010
7586012 Process for recovering an adduct of a bis(4-hydroxyaryl)alkane and a phenolic compound Sep. 8, 2009
7427694 Process for the preparation of high-purity bisphenol A Sep. 23, 2008
7371902 Methods for purifying p,p-bisphenol-A May. 13, 2008
7115785 Method for making salts hydroxy-substituted hydrocarbons Oct. 3, 2006
7067704 Process for purifying bisphenol-a Jun. 27, 2006
7045664 Process for producing bisphenol A May. 16, 2006
7034191 Continuous crystallization process Apr. 25, 2006
6951965 Process for purifying phenol-containing bisphenol A Oct. 4, 2005
6946581 Bisphenol compound composition having excellent thermal stability Sep. 20, 2005
6919487 Bis(4-hydroxyaryl)alkanes Jul. 19, 2005
6906227 Bisphenol phenol adducts Jun. 14, 2005
6828465 Method for producing bisphenols Dec. 7, 2004
6716729 Stable bisphenolic compositions Apr. 6, 2004
6710211 Method for the production of bisphenol-a Mar. 23, 2004
6689464 Method and device for producing bisphenol a prills and bisphenol a prills produced according to this method Feb. 10, 2004
6620979 High purity 9,9-bis-(hydroxyphenyl)-fluorene and method for the preparation and purification thereof Sep. 16, 2003
6600004 Method of preparing polyestercarbonates Jul. 29, 2003
6576801 Process for the neutralization of residual acid species in crude dihydric phenols Jun. 10, 2003
6545187 Production of low-particulate bisphenol and use thereof in the manufacturing of polycarbonate Apr. 8, 2003
6512148 Process for the production of bisphenol A Jan. 28, 2003
6464838 Process for the recovery of compounds present in the heavy products after their preparation Oct. 15, 2002
6414106 Process for the neutralization of residual acid species in crude dihydric phenols Jul. 2, 2002
6414198 Method for producing bisphenol-A Jul. 2, 2002
6384288 Method for the production of bis(4-hydroxyaryl)alkanes May. 7, 2002
6316678 Method for producing dis(4-hydroxyaryl) alkanes Nov. 13, 2001
6313355 Process for the preparation of tetrabromobisphenol-A Nov. 6, 2001
6307111 Method for continuous production of dihydroxydiarylalkanes Oct. 23, 2001
6300527 Process for the preparation of tetrabromobisphenol-A Oct. 9, 2001
6235946 Process for the preparation of tetrabromobisphenol-A May. 22, 2001
6218584 Process for the preparation of tetrabromobisphenol-A Apr. 17, 2001
6203612 Process for cleaning bisphenol crystallizer Mar. 20, 2001
6197916 Method for preparing bisphenol A Mar. 6, 2001
H1943 Process for the manufacture of bisphenol-A Feb. 6, 2001
6162953 Process for the preparation of tetrabromobisphenol-A Dec. 19, 2000
6130359 Liquid vacuum pump seal to reduce contamination in bisphenol-A Oct. 10, 2000
6084137 Process for the preparation of tetrabromobisphenol-A Jul. 4, 2000
6011184 Descaling of bisphenol-A reactor using water Jan. 4, 2000
6002051 Tertiary alkyl alkylphenols and organic compositions containing same Dec. 14, 1999
5990362 Method for preparing bisphenol A Nov. 23, 1999
5986149 Method for recovering alkanols from aqueous HBr-solutions Nov. 16, 1999
5959160 Purification of p,p-bisphenolate solutions Sep. 28, 1999

1 2 3 4










 
 
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