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:
Jun. 16, 2009
Filed:
Jun. 20, 2008
Hatem Abdallah Belfadhel, Roosendaal, NL;
Hans-peter Brack, Herrliberg, CH;
Martin Walde, Mettmenstetten, CH;
Dennis James Patrick Maria Willemse, Standdaarbuiten, NL;
Hatem Abdallah Belfadhel, Roosendaal, NL;
Hans-Peter Brack, Herrliberg, CH;
Martin Walde, Mettmenstetten, CH;
Dennis James Patrick Maria Willemse, Standdaarbuiten, NL;
Sabic Innovative Plastics IP B.V., Bergen op Zoom, NL;
Abstract
A method is provided for producing an ester-substituted phenol product stream from an ester-substituted diaryl carbonate manufacturing waste stream. The method includes the steps of obtaining a waste stream containing an ester-substituted diaryl carbonate from an ester-substituted diaryl carbonate manufacturing facility and creating a reaction mixture by combining the waste stream with a solvent and with a transesterification catalyst. The reaction mixture is maintained at a reaction pressure at or below atmospheric pressure, and at a reaction temperature for a period of time sufficient to produce ester-substituted phenol by solvolysis of the ester-substituted diaryl carbonate. Ester-substituted phenol is removed from the reaction mixtures in an ester-substituted phenol stream. The solvent, the reaction temperature, and the reaction time are selected in combination such that less than 1,000 ppm of acid-substituted phenol is present in the ester-substituted phenol stream.