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:
May. 13, 2003
Filed:
Dec. 11, 2001
Applicant:
Inventor:
Hussain Al Ghatta, Fiuggi, IT;
Assignee:
Sinco Ricerche S.p.A., , IT;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08J 1/104 ; C07C 5/109 ;
U.S. Cl.
CPC ...
C08J 1/104 ; C07C 5/109 ;
Abstract
A method for the recovery of dicarboxylic aromatic acids, in particular terephthalic acid, from manufactured aromatic polyester-resin articles for recycling, wherein the article, fragmented into chip form, is reacted in solution in a carboxylic acid with 2-6 carbon atoms and with a pKa from 4 to 6, preferably glacial acetic acid, in the presence of catalytic quantities of a strong acid with a pKa of less than 1, preferably aqueous hydrochloric acid or sulfuric acid, operating at temperatures from 160° to 250° C.