Process for preparing dialkyl tetrahalophthalates

Details Process for preparing dialkyl tetrahalophthalates Process for preparing dialkyl tetrahalophthalates

1995-11-06

1998-03-17

Gibson, Sharon

Compositions

Fire retarding

252601, 560 62, 560 65, 560 78, 560 99, C09K 2100, C07C 6700, C07C 6900

Patent

active

057283230

ABSTRACT:
A process for the preparation of dialkyl tetrahalophthalates. A tetrahalophthalic anhydride or acid is dissolved in excess C.sub.1 -C.sub.18 alkanols. Residual sulfuric acid is removed by treatment with magnesium acetate or multiple water washes. The mass is esterified with a tetraalkyl titanate, and residual acidic components are removed by treatment with magnesium silicate. These treatments improve processability, production cycle time, product color, clarity and purity.

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Weissermel, Klaus and Hans-Jurgen, Arpe, Industrial Organic Chemistry, Second, Revised and Extended Edition, translated by Lindley, Charlet R., 1993; pp. 132-134, 206-208.

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