Hydrotreating polyester precursors

Details Hydrotreating polyester precursors Hydrotreating polyester precursors

2006-06-27

2006-06-27

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C502S150000, C528S481000, C564S450000, C564S451000, C568S816000, C568S834000, C568S862000, C568S863000

Reexamination Certificate

active

07067615

ABSTRACT:
A process comprising contacting a liquid polyester stream with hydrogen in the presence of a hydrogenation catalyst comprising a metal supported on the surface of silicon carbide at a metal dispersion of at least 0.5% or graphite at a metal dispersion of at least 10% to produce a treated liquid polyester stream. The treated stream may be polycondensed in the presence of a polycondensation catalyst to produce a polyester polymer having an It.V. of at least 0.55 dL/g. The liquid polyester stream desirably has a composition comprising:a) terephthalic acid residues, isophthalic acid residues, and/or naphthalenedicarboxylic acid residues andb) an average degree of polymerization of 0.5 to 20 andc) an acid number ranging from 5 to 600.

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