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1. (WO2018200466) THERMOLYSIS OF POLYPROPIOLACTONE TO PRODUCE ACRYLIC ACID

Pub. No.:    WO/2018/200466    International Application No.:    PCT/US2018/029060
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 25 01:59:59 CEST 2018
IPC: C07C 57/04
Applicants: NOVOMER, INC.
Inventors: SHERRY, Kyle Evan
RUHL, John
Title: THERMOLYSIS OF POLYPROPIOLACTONE TO PRODUCE ACRYLIC ACID
Abstract:
The present invention is directed to reactor apparatus and processes for thermolysis of polypropiolactone to produce highly pure acrylic acid. In preferred embodiments of the present invention, the processes comprise introducing a feed stream comprising polypropiolactone to a thermolysis process vessel through an inlet; maintaining a concentration of active salt by adding and removing portions of active salt by at least one inlet and at least one outlet; heating the thermolysis process vessel; and recovering a product including acrylic acid from an outlet. In certain preferred embodiments, the active salt may be present as a catalyst used for polymerization of the polypropiolactone in the feed stream. In some embodiments, one or more active salts may be added to the feed stream and/or the thermolysis process vessel.