C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/43 (2006.01) C07C 63/26 (2006.01)
Patent
CA 2445063
Disclosed is a method for the recovery of crystalline therephthalic acid containing less than 150 ppmw p-toluic acid by subjecting a solution of therephthalic acid containing minor amounts of p-toluic acid to crystallization in a crystallization zone comprising a plurality of series- connected crystallizers wherein the solution is subjected to rate-controlled evaporative cooling by sequential reduction in pressure and temperature to cause crystallization of therephthalic acid, wherein the pressure of the solution at the end of the crystallization zone is ambient pressure or less. Solvent which is evaporated from the crystallizers is collected and condensed and the condensed solvent is returned to the crystallization zone at a point subsequent to the crystallizer from which it was obtained.
L'invention concerne un procédé de récupération d'acide téréphtalique cristallin, contenant moins de 150 ppm d'acide p-toluique, consistant à soumettre une solution d'acide téréphtalique, contenant de faibles quantités d'acide p-toluique, à cristallisation dans une zone de cristallisation comprenant plusieurs cristalliseurs en série, la solution étant soumise à un refroidissement évaporatif à vitesse régulée obtenu par réduction séquentielle de pression et de température provoquant la cristallisation de l'acide téréphtalique, la pression de la solution à la fin de la zone de cristallisation étant égale ou inférieure à la pression ambiante. Le solvant qui est évaporé des cristalliseurs est collecté et condensé, puis retourné vers la zone de cristallisation à un endroit situé en aval du cristalliseur à partir duquel il a été obtenu.
Kirk Shane Kipley
Lin Robert
Mcmurray Brian David
O'meadhra Ruairi Seosamh
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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