Reduzierung der Voc- und Nebelwerte von Polypropylenqualitäten durch Belüftung

Details

Veröffentlichungs-Nr.

EP3647328

Aktenzeichen

EP18203757

Anmeldetag

31. Oktober 2018

Veröffentlichung

6. September 2023

Erteilung

6. September 2023

Rechtsraum

EP

IPC

C08F6/00C08L23/10C08L23/12// B29B9/16

Abstract

A process for reducing the amount of volatile and semi-volatile organic substances of a polypropylene composition to below 80 µg/g (VOC, VDA 278 October 2011) and below 350 µg/g (FOG, VDA 278 October 2011), the polypropylene composition including a polypropylene homopolymer and/or a polypropylene random copolymer,the process comprising the steps ofa) providing an aeration vessel having- at least one inlet for aeration gas,- at least one outlet for exhaust gas,- an inlet for a raw polypropylene composition at the top of the aeration vessel,- an outlet for the polypropylene composition at the bottom of the aeration vessel,wherein the polypropylene composition is present as a packed bed.b) initiating a counter-current flow of the polypropylene composition and aeration gasc) by- feeding the raw polypropylene composition having a volatile organic compound content (VOC, VDA 278 October 2011) of greater than about 150 µg/g and a semi-volatile organic condensable content of greater than about 350 µg/g (FOG, VDA 278 October 2011), into said aeration vessel from the top,- feeding the aeration gas into said aeration vessel via the at least one inlet at the bottom;- withdrawing the exhaust gas via the outlet for exhaust gas;- withdrawing the aerated polypropylene composition via the outlet at the bottom of the aeration vesseld) maintaining said aeration gas flow for an aeration time of from 3 to 96 hours, wherein, the temperature of the gas is from 100 °C to 140 °C, and wherein, the Reynolds number of the gas flow is from 5 to 150.

Anmelder

Firma

Borealis AG

Land

🇦🇹 Österreich

Fachgebiete