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:
Mar. 18, 1997
Filed:
Nov. 16, 1995
Applicant:
Inventors:
Guido Ghisolfi, Tortona, IT;
Dario Giordano, Tortona, IT;
Giuseppina Boveri, Tortona, IT;
Hussain A Al Ghatta, Fiuggi, IT;
Assignee:
Sinco Engineering S.p.A., Tortona, IT;
Primary Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
4232453 ; 423351 ; 528272 ; 528274 ;
Abstract
Process for the purification of an inert gas recycled from a solid state polycondensation (SSP) reactor of aromatic polyester resins, comprising the step of adding the gas with oxygen or gas containing oxygen in stoichiometric quantity or in such an excess that the gas at the outlet of the catalytic bed contains no more than 250 ppm of oxygen, circulating the gas on a catalytic bed comprising Pt or Pt and Pd heated at temperatures from 250.degree. to 600.degree. C. and recycling the gas to SSP reactor with previous drying to eliminate the water formed in the oxidation stage.