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US 9,850,201 B2Granted
Process for the manufacture of dihalodiphenylsulfones
AssigneeSolvay Speciality Polymers USA, LLC
InventorChantal Louis
Life of this patent
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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, at least one fluorinated anhydride and at least one halobenzene. The invented process is particularly suited for the manufacture of 4,4′-dichlorodiphenyl sulfone.
Claims18
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 F, Cl, Br, I;
- Ar1, Ar2 are equal or different from each other and are aromatic moieties of the formula:
- 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 selected from the group consisting of sulfuric acid, arene sulfonic acid or oleum, at least one fluorinated anhydride;
- at least one halobenzene and, optionally, an aromatic compound;
- wherein the process is carried out in the presence of a catalyst selected from the group consisting of boric acid, boronic acid, aluminosilicates, perfluoroalkanesulfonic acid resins, mixed oxides, and mixtures thereof, and in the absence of any solvent or in the presence of a solvent selected from the group consisting of:
- alkanes, chloroalkenes, chloroalkanes, halobenzenes and carbon disulfide.
10 more elements
Dependencies are inferred from the claim text.