Method of producing A 2,4'-dihydroxydiphenylsulfone

Details Method of producing A 2,4'-dihydroxydiphenylsulfone Method of producing A 2,4'-dihydroxydiphenylsulfone

1993-12-10

1995-03-21

Richter, Johann

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

Organic compounds

Sulfur containing

568 28, C07C31500, C07C31506

Patent

active

053997727

ABSTRACT:
High purity 2,4'-dihydroxydiphenylsulfones useful as developers for thermal recording paper can be produced efficiently and with high selectivity by reacting one or more phenols and sulfuric acid in the presence as of at least one of phosphonic acid, phosphinic acid and salts thereof, in the absence of a solvent or in the presence of an aromatic hydrocarbon solvent having a boiling point at atmospheric pressure of 130.degree. to 200.degree. C., and then purifying the thus-produced crude 2,4'-dihydroxydiphenylsulfones using a mixed solvent containing (1) 5 to 20 weight % of at least one lower aliphatic alcohol and 95 to 80 weight % of at least one aromatic hydrocarbon which does not contain halogen, (2) 10 to 40 weight % of at least one ketone and 90 to 60 weight % of at least one aromatic hydrocarbon which does not contain halogen or (3) 10 to 40 weight % of at least one ester of acetic acid and 90 to 60 weight % of at least one aromatic hydrocarbon which does not contain halogen.

REFERENCES:
patent: 3318956 (1967-05-01), Mausner
patent: 3366692 (1968-01-01), Orem
patent: 3383421 (1968-05-01), Fox
patent: 5025090 (1991-06-01), Barda
patent: 5041677 (1991-08-01), Cooker et al.
patent: 5072049 (1991-12-01), Stumpp et al.

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