The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 2006
Filed:
Aug. 21, 2003
Robert P. Hepfer, St. Charles, IL (US);
Craig T. Miller, Batavia, IL (US);
Gregory A. Norenberg, Medina, OH (US);
Thomas G. Attig, Batavia, IL (US);
John R. Budge, Beachwood, OH (US);
Robert P. Hepfer, St. Charles, IL (US);
Craig T. Miller, Batavia, IL (US);
Gregory A. Norenberg, Medina, OH (US);
Thomas G. Attig, Batavia, IL (US);
John R. Budge, Beachwood, OH (US);
ISP Investments Inc., Wilmington, DE (US);
Abstract
In the process for the conversion of maleic acid to gamma-butyrolactone, 1.4-butanediol and/or tetrahydrofuran, a feedstream comprising maleic acid is hydrogenated in a first hydrogenation zone to produce a reaction product comprising succinic acid and unreacted hydrogen which is then supplied to a second hydrogenation zone, where succinic acid is converted to 1,4-butanediol, the temperatures of the feedstream comprising maleic acid and the first hydrogenation zone are controlled such that the temperature of maleic acid in the feedstream and the first hydrogenation zone does not exceed about 130° C., thereby minimizing the corrosive effects of the maleic acid and prolonging reactor life and improving overall process economics.