Process for recovering suitable polyester feed material from recycled polyester, and apparatus for depolymerizing a recycled polyester.

摘要

"PROCESS FOR RECOVERING POLYESTER FEEDING LOAD MATERIAL SUITABLE FROM RECYCLED POLYESTER, AND, APPLIANCE FOR DEPOLIMERIZING A RECYCLED POLYESTER". A process for recovering suitable polyester feed material from recycled polyester includes the stages of depolymerizing the polyester into its ester monomers and component semesters; separating monomers and semi-esters from other secondary materials; and mixing the ester monomers and component semesters with additional monomers to produce a low molecular weight polyester. In a preferred embodiment of the invention, the recycled polyester is contacted with a component monomer or oligomer thereof to liquefy the polyester before the polyester is depolymerized. The invention additionally provides an apparatus for carrying out the process. The apparatus includes a first reactor to depolymerize the recycled polyester, a separator to separate the monomeric components of the ester and semi-esters from secondary materials produced in the first reactor, and a second reactor to produce a low molecular weight polyester from the liquefied separator products.