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. 04, 2011
Filed:
Dec. 21, 2004
Rodney Scott Armentrout, Kingsport, TN (US);
Frederick Leslie Colhoun, Kingsport, TN (US);
Michael Paul Ekart, Kingsport, TN (US);
Bruce Roger Debruin, Lexington, SC (US);
Rodney Scott Armentrout, Kingsport, TN (US);
Frederick Leslie Colhoun, Kingsport, TN (US);
Michael Paul Ekart, Kingsport, TN (US);
Bruce Roger DeBruin, Lexington, SC (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
In one embodiment, there is provided a process comprising introducing polyester polymer particles containing residual acetaldehyde into a vessel at a temperature within a range of 130° C. to 195° C. to form a bed of particles within the vessel, flowing a gas through at least a portion of the particle bed, and withdrawing finished particles from the vessel having a reduced amount of residual acetaldehyde. In this process, it is not necessary to introduce a hot flow of gas at high flow rates otherwise required to heat up cool particles to a temperature sufficient to strip acetaldehyde. Rather, this process provides a benefit in that, if desired, gas introduced into the vessel at low flow rates and low temperatures can nevertheless effectively strip acetaldehyde in a reasonable time because the hot particles quickly heat a the gas to the particle temperature.