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US 2014/0228597 A1Published application
Process for the manufacture of dihalodiphenylsulfones starting from organic acids
AssigneeSolvay Speciality Polymers USA, LLC
InventorChantal Louis
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Abstract
A process for the preparation of dihalodiphenylsulfones_such as 4,4′-dichlorodiphenyl sulfone or 4,4′-bis-(4-chlorophenylsulfonyl)biphenyl with high regioselectivity, at low temperature and in the absence of toxic reagents by reacting together at least one acid, sulfur trioxide and at least one halobenzene. The invented process is particularly suited for the manufacture of 4,4′-dichlorodiphenyl sulfone.
Claims20
A process for making a molecule of the formula (M):
- X—[Ar1—SO2—Ar2]—[Ar3]n—[Ar1—SO2—Ar2]m—X (M)
- wherein:
- n and m are independently 0, 1, 2, 3 or 4;
- X is a halogen selected from chlorine, fluorine, bromine and iodine;
- Ar1, Ar2 are equal or different from each other and are aromatic moieties of the formula:
- wherein Ar3 is selected from the group consisting of:
- and
- each Ri is independently selected from the group consisting of:
- hydrogen, halogen, alkyl, alkenyl, alkynyl, aryl, ether, thioether, carboxylic acid, ester, amide, imide, alkali or alkaline earth metal sulfonate, alkyl sulfonate, alkali or alkaline earth metal phosphonate, alkyl phosphonate, amine and quaternary ammonium;
- by reacting together at least one acid, sulfur trioxide, at least one halobenzene, and optionally, an aromatic compound, wherein the at least one acid is selected from the group consisting of phosphonic, sulfonic, carboxylic acids, and mixtures thereof.
7 more elements
(canceled)
Dependencies are inferred from the claim text.