Process for the preparation of partially hydrogenated acrylonitrile-butadiene rubbers (HNBR) with on-line application of Raman spectroscopy

US6307624A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Dieter W. Bruck · Cologne, DE
• Udo Wolf · Kempen, DE

Key dates

• Filing date: Aug 13, 1998
• Grant date: Oct 23, 2001
• Expiry date: Aug 13, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08C19/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of partially hydrogenated acrylonitrile-butadiene rubber in a pressurised reactor by hydrogenation of acrylonitrile-butadiene rubber by means of homogeneous or heterogeneous catalysis, in which the reactor contents are rendered inert before commencement of the hydrogenation, the Raman spectra of the reactor contents are recorded at short time intervals and the actual degree of hydrogenation of the product is determined from the intensities of the Raman emission lines and, on attainment of the required degree of hydrogenation, the reaction is arrested by suitable means.