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AssigneeBP Corporation North America Inc.
InventorsRosemary F. McMahon, John A. Macek, Gregory P. Hussmann, Michael J. Panzer, Raymond J. Eifert, David A. Young, Allen B. Mossman, J. Deven Cleckler
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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.
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 material having polyethylene naphthalate at a temperature range of about 500° F. to about 700° F. and at a pressure in the range of about 5 to about 250 atmospheres absolute through reaction zones arranged in succession while introducing a naphthalenedicarboxylic acid, a material having polyethylene naphthalate and a low molecular weight alcohol to an upstream reaction zone, agitating at least one reaction zone, and removing a product having a dialkylester formed by the reaction of the naphthalenedicarboxylic acid and the material having polyethylene naphthalate with the low molecular weight alcohol from a downstream reaction zone.
A process for preparing a dialkylester of a naphthalenedicarboxylic acid comprising contacting a low molecular weight alcohol, a naphthalenedicarboxylic acid, and a material having polyethylene naphthalate in a liquid esterification reaction mixture comprising a dialkylester of the naphthalenedicarboxylic acid, at a temperature in the range of about 500° F. to about 700° F. and at a pressure in the range of about 5 to about 250 atmospheres absolute in a vertically arranged, compartmented reactor having at least an upper and lower compartment, the compartments being separated by a dividing means having an opening to permit the upward flow of the esterification reaction mixture between reactor compartments, and where the low molecular weight alcohol and the naphthalenedicarboxylic acid and the material having polyethylene naphthalate are added to a lower compartment or compartments, and a reaction product mixture having a diester of naphthalenedicarboxylic acid is removed from an upper reactor compartment.
A process for preparing a dialkylester of a naphthalenedicarboxylic acid comprising contacting the naphthalenedicarboxylic acid, and a material having polyethylene naphthalate, with a low molecular weight alcohol in a suitable reaction zone and in a reaction mixture comprising a liquid dialkylester of a naphthalenedicarboxylic acid, a naphthalenedicarboxylic acid, a material having polyethylenenaphthalate and a low molecular weight alcohol, under reaction conditions where the low molecular weight alcohol is present in the reaction mixture in both the liquid and the gas phase, where low molecular weight alcohol is added to the reaction zone and simultaneously removed from the reaction zone such that the ratio of the rate of removal of the alcohol in pounds per hour from the reaction zone in the gas phase to the rate of addition of the alcohol to the reaction zone in pounds per hour is about 0.5:1 to about 0.99:1.
A process for preparing a purified dialkylester of a naphthalenedicarboxylic acid comprising:
Dependencies are inferred from the claim text.