Patent · US Active

Method for producing a polycarbonate using a stripping device

US10881981B2 · kind B2 · utility

0Cited by

2References

17Claims

0Family size

Assignee

EPC Engineering & Technologies GMBH · DE

Inventors

Michael Streng · Maintal, DE
Dieter Kloos · Dinkelsbühl, DE
Malte Bracht · Norden, DE

Key dates

Filing date	Aug 11, 2017
Grant date	Jan 5, 2021
Priority date	—
Expiry date	Sep 30, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/307
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method is described for producing a polycarbonate by reacting one or more diaryl carbonates with one or more aromatic hydroxy compounds, which are first mixed in a mixing device and enter, as a raw material mixture, a raw material mixture container to subsequently react in one or more reactors under reduced pressure and increased temperature to form polycarbonate, wherein the mixture of diaryl carbonate and aromatic hydroxy compound is subjected to a purification by an inert gas in a countercurrent process, in a stripping device, before entering the raw material mixture container. The present invention also relates to a stripping device which is particularly suitable for purifying a raw material mixture stream, and to the use of such a stripping device in a method for producing polycarbonate.

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