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:
Sep. 01, 1998
Filed:
Apr. 30, 1997
Carrie A Feeney, Bridgewater, NJ (US);
Ida L Jones, Charlotte, NC (US);
Bennett C Ward, Koenigstein, DE;
Thomas M Kenesson, Corpus Christi, TX (US);
Charles B Hilton, Corpus Christi, TX (US);
Michael R Ahern, Bayonne, NJ (US);
Gregory M Adams, Corpus Christi, TX (US);
Edward M de la Garza, Corpus Christi, TX (US);
B Frank Wood, Jr, Corpus Christi, TX (US);
Thomas L Grantland, San Antonio, TX (US);
Kan J Tsai, Corpus Christi, TX (US);
James L Ragan, Corpus Christi, TX (US);
Hoechst Celanese Corp., Somerville, NJ (US);
Abstract
Processes for recovering 4,4'-dimethyl bibenzoate (DMBB) from byproduct streams of dimethyl terephthalate (DMT) production are disclosed. The byproduct streams are treated to produce an overhead stream which includes DMBB. In one aspect of the invention, the overhead product stream is added to an organic solvent under conditions sufficient to rapidly form a suspension of crystallized DMBB. In another aspect of the invention, the overhead is dissolved in an appropriate organic solvent and cooled to form a suspension of DMBB crystals in the solvent. A portion of the suspension is removed, and the remaining portion of the suspension centrifuged to recover DMBB crystals. In still another aspect of the invention, the overhead stream is treated with an organic solvent to form a slurry of DMBB crystals, and the resultant slurry thermally treated to increase the concentration of DMBB crystals therein while also solubilizing any organic contaminants.