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:
Mar. 23, 2010
Filed:
Aug. 22, 2005
Andreas Christel, Zuzwil, CH;
Claudemiro Ferreira, Pocos de Caldes, BR;
Andreas Christel, Zuzwil, CH;
Claudemiro Ferreira, Pocos de Caldes, BR;
Buhler AG, Uzwil, CH;
Abstract
The invention relates to a method for producing a high-molecular polycondensate from a solidified polycondensate prepolymer by solid phase polycondensation. According to said method, the polycondensation cleavage products of the solid phase polycondensation reaction are extracted from the product by means of a process gas, and the process gas is then cleaned of the polycondensation cleavage products and essentially recycled. According to the invention, the specific energy input is less than 120 kWh/t, preferably less than 110 kWh/t and especially between 70 and 100 kWh/t. The invention also relates to an installation for producing a high-molecular polycondensate, said installation comprising a heating appliance (), followed by a crystallisation appliance (), a reaction appliance (), and a cooling appliance (). A gas outlet () of the cooling appliance () is connected to a gas inlet () of the heating appliance (), a gas outlet () of the reaction appliance () is connected to a gas inlet () in a gas cleaning system (), and a gas outlet () of the gas cleaning system () is connected to a gas inlet () of the reaction appliance ().