The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 2016
Filed:
Nov. 07, 2013
Hitachi, Ltd., Tokyo, JP;
Masayuki Kamikawa, Tokyo, JP;
Toshiaki Matsuo, Tokyo, JP;
Takeyuki Kondo, Tokyo, JP;
Yasunari Sase, Tokyo, JP;
Masashi Tanto, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
Provided are a device and a method for efficiently producing a polyester by using 1,4-butanediol as a starting material. The device for producing a polyester includes: a preparation tank () for starting material slurry; a storage tank () for starting material slurry; an esterification reactor (); an initial polycondensation reactor (); a middle polycondensation reactor (); and a final polycondensation reactor (). An exhaust system for each of the initial, middle, and final polycondensation reactors includes a wet condenser (, or) using a liquid containing 1,4-butanediol as a coolant; and a hot well (, or) connected to the corresponding wet condenser. Herein, process scattered substances scattering with exhaust are collected, and hydrolyzed in the hot well, so as to be returned to the esterification step. This allows the polyester to be efficiently produced.