Carrie A. Feeney - Bridgewater NJ Ida L. Jones - Charlotte NC Bennett C. Ward - Koenigstein, DE Thomas M. Kenesson - Corpus Christi TX Charles B. Hilton - Corpus Christi TX Michael R. Ahern - Bayonne NJ Gregory M. Adams - Corpus Christi TX Edward M. de la Garza - Corpus Christi TX B. Frank Wood - Corpus Christi TX Thomas L. Grantland - San Antonio TX Kan J. Tsai - Corpus Christi TX James L. Ragan - Corpus Christi TX
Assignee:
Hoechst Celanese Corp. - Somerville NJ
International Classification:
C07C 6748
US Classification:
560 78
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.
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Category: More news
Source: Google
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Date: Apr 11, 2013
Category: Sci/Tech
Source: Google
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