John A. Macek - Naperville IL Bruce I. Rosen - Morton Grove IL Juergen K. Holzhauer - Naperville IL John S. Bramlet - Lockport IL Larry D. Lillwitz - Yorkville IL David J. Schneider - Carol Stream IL Lawrence L. Lang - Aurora IL Edward E. Paschke - Wheaton IL John M. Weis - Naperville IL Yenamandra Viswanath - Naperville IL Stefanos L. Sakellarides - Naperville IL
The synthesis of dimethyl-1,5-naphthalenedicarboxylate and polymers and articles formed therefrom is disclosed, as well as applications for dimethyl-1,5-naphthalenedicarboxylate, its corresponding acid 1,5-NDA, and various synthesis intermediates.
Recycling Polyethylene Naphthalate Containing Materials In A Process To Produce Diesters
Rosemary F. McMahon - Wheaton IL, US John A. Macek - Aurora IL, US Gregory P. Hussmann - Batavia IL, US Michael J. Panzer - Lockport IL, US Raymond J. Eifert - Warrenville IL, US David A. Young - Hartselle AL, US Allen B. Mossman - Wheaton IL, US J. Deven Cleckler - Decatur AL, US
BP Corporation North America Inc. - Warrenville IL
C07C 67/08 C07C 69/76
560100, 560 96, 560 98
A process for preparing a dialkylester of a naphthalenedicarboxylic acid comprising directing a liquid phase reaction mixture comprising a low molecular weight alcohol, a naphthalenedicarboxylic acid, a dialkylester of a naphthalenedicarboxylic acid, and a polyethylene naphthalate containing material, at a given temperature and pressure through series arranged reaction zones and subsequently removing a product comprising a dialkylester formed by the reaction of the naphthalenedicarboxylic acid and the polyethylene naphthalate containing material with the low molecular weight alcohol from a reaction zone. This invention is also directed to a process for preparing a purified dialkylester of a naphthalenedicarboxylic acid comprising a series of crystallization and distillation steps, and combinations thereof.
Process For Manufacture Of High Molecular Weight Polyester Resins From 2,6-Naphthalene Dicarboxylic Acid
Allen B. Mossman - Wheaton IL John A. Macek - Naperville IL Lawrence G. Packer - Lisle IL
Amoco Corporation - Chicago IL
High quality linear polyester resin is prepared by reacting in a first step or zone 2,6-naphthalene dicarboxylic acid with a molten prepolymer derived from a glycol and 2,6-naphthalene dicarboxylic acid to form a low molecular weight product of the first step or zone; reacting this resultant product with a glycol in at least two successive steps or zones of glycol addition to form prepolymer; and polymerizing at least a portion of the resulting prepolymer to form polyester resin which exhibits midpoint glass transition temperatures above about 123. degree. C. The resulting prepolymer is particularly suitable for reaction with the 2,6-naphthalene dicarboxylic acid in the first step or zone. Advantageously, at least a portion of the prepolymer is, therefore, returned to the first step or zone.
Process For Recovery Of Aromatic Acid From Waste Polyester Resin
Jeffrey L. Broeker - Naperville IL John A. Macek - Naperville IL Bruce I. Rosen - Morton Grove IL Thomas M. Bartos - Naperville IL
Amoco Corporation - Chicago IL
Processes are disclosed for recovery and purification of dibasic aromatic acids from waste polyester film, fiber, bottles, manufacturing residues, and other manufactured articles. The processes comprises: depolymerizing polyester resin in a solvent under conditions suitable for hydrolysis of ester bonds to obtain a mixture containing a solution of aromatic acid and impurities consisting of alcohol and/or other components of the resin; burning impurities in a liquid-phase oxidation with an oxygen-containing gas in the presence of an oxidation catalyst at elevated pressures and temperatures, to obtain an oxidation product containing the desired aromatic acid; and crystallizing and separating from the oxidation system a resulting crude dibasic aromatic acid. Crude acid is, optionally, hydrogenated in an aqueous solution at elevated temperatures and pressures in the presence of hydrogen and an insoluble metal-containing catalyst, which is thereupon separated from the aqueous solution, and purified dibasic aromatic acid recovered by crystallization and mechanical separation from the aqueous solution. Purified terephthalic acid has, typically, a L*-value in a range of from about 95 to about 100, an a*-value in a range of from about -1 to about +1, and a b*-value in a range of from about 0.