C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/78 (2006.01) C07C 29/84 (2006.01) C08G 63/183 (2006.01) C08G 63/84 (2006.01) C08G 63/90 (2006.01)
Patent
CA 2360125
A process for preparing a 1,3-propanediol-based polyester in which a carbonyl- containing 1,3-propanediol stream is purified for reuse of the 1,3-propanediol. The process involves reacting, under condensation polymerization conditions, terephthalic acid and a molar excess of 1,3-propanediol, with distillation and condensation of a major portion of the unreacted 1,3-propanediol. To this condensed stream is added a sufficient amount of base to raise the pH to a value greater than 7, and from this base-containing condensate the 1,3-propanediol is distilled and recycled to the polymerization reaction.
L'invention concerne un procédé de préparation d'un polyester à base de propanediol-1,3 dans lequel un flux de propanediol-1,3 contenant du carbonyle est purifié en vue de la réutilisation de propanediol-1,3. Ce procédé consiste à faire réagir, dans des conditions de polymérisation de condensation, un acide téréphtalique et un excès molaire de propanediol-1,3, avec distillation et condensation d'une partie plus importante de propanediol-1,3 inaltéré. A ce flux condensé, on ajoute une quantité suffisante d'une base pour élever le PH à une valeur supérieure à 7, et à partir de ce condensat contenant la base, le propanediol-1,3 est distillé et recyclé vers la réaction de polymérisation.
Kelsey Donald Ross
Scardino Betty Marrou
Zronek Steven Charles
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Shell Internationale Research Maatschappij B.v.
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