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US 7,741,509 B2Granted
Conversion of terephthalic acid to Di-n-butyl terephthalate
AssigneeEastman Chemical Company
InventorsSteven Leroy Cook, Phillip Wayne Turner, Vickie Haygood Osborne
Life of this patent
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Abstract
Disclosed is a process for the preparation of di-n-butyl terephthalate by the esterification of terephthalic acid with n-butanol in the presence of a strong acid while employing a fractionating column.
Claims3
A process for the preparation of di-n-butyl terephthalate, comprising:
- contacting terephthalic acid with butanol in the presence of a catalyst in a reactor, and
- removing water via a fractionation column fitted to the reactor,
- wherein the total pressure is maintained at about atmospheric pressure,
- the temperature is maintained at about 110° to 220° C.,
- catalyst is selected from the group consisting of methane sulfonic acid, sulfuric acid, methane disulfonic acid, butane sulfonic acid, perfluorobutane sulfonic acid, and mixtures thereof, and
- the catalyst is present in amount of from about 3% to about 15% by weight.
3 more elements
Dependencies are inferred from the claim text.