Patent · US Active

Process for thermal separation of a solution consisting of thermoplastic polymer and solvent

US9079984B2 · kind B2 · utility

2Cited by

0References

6Claims

0Family size

Assignee

LIST AG · CH

Inventors

Daniel Witte · Weil am Rhein, DE
Thomas Isenschmid · Magden, CH
Manuel Steiner · Basel, CH

Key dates

Filing date	Jun 29, 2011
Grant date	Jul 14, 2015
Priority date	—
Expiry date	Jul 4, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F6/12
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for thermal separation of a solution comprised of a thermoplastic polymer and a solvent involves heating a solvent under pressure above a critical point of the solvent; decompressing the heated solvent in a first vessel, such that a polymer-rich and a low-polymer phase form; and supplying the polymer-rich phase to a second vessel. In embodiments, on entry into the second vessel, a pressure jump occurs, the pressure jump leading to a thermal flash in the second vessel such that a polymer part of the polymer-rich phase rises to at least 70%, and a resulting polymer-rich solution is provided.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.