Efficient methods for making tetrahalophthalate esters having ex

Details Efficient methods for making tetrahalophthalate esters having ex Efficient methods for making tetrahalophthalate esters having ex

1999-06-30

2000-11-21

Geist, Gary

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

Organic compounds

Carboxylic acid esters

C07C 6976, C08K 509

Patent

active

061505528

ABSTRACT:
Provided are methods for the preparation and purification of alkyl tetrahalophthalate esters by the reaction of a tetrahalophthalic compound with an alkanol in the presence of a titanate catalyst. More particularly, improved methods are provided for making and recovering an ester with little contamination by catalytic metal components and color bodies, and with little acidity, in a high yield from the esterification reaction by pretreating the starting materials to reduce the acidity thereof, reacting the starting materials in the presence of a titanate catalyst, stripping excess alcohol, hydrolyzing the catalyst, and filtering out solids to yield a high purity tetrahalophthalate ester product.

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