Mixing kneader and process for preparing poly(meth)acrylates using the mixing kneader

US8070351B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Uwe Stueven · Bad Soden, DE
• Leo Van Miert · Kapellen, BE
• Dominicus van Esbroeck · Nanjing, CN
• Oskar Stephan · Hockenheim, DE
• Annemarie Hillebrecht · Bad Reichenhall, DE
• Huanmin Wei · Bischofswerda, DE

Key dates

• Filing date: Sep 28, 2005
• Grant date: Dec 6, 2011
• Expiry date: Feb 11, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29B7/485
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a mixing kneader comprising at least two shafts (2,3) configured as hollow shafts, on whose surfaces kneading bars (4) are disposed on elements (5). The construction of the shafts is selected in such a way that the resonant frequencies of the shafts have a separation of at least 5% from the excitation frequencies. At least one of the shafts is preferably flowed through by a temperature-control medium, the inlet being disposed on one side and the outlet on the other side of the shaft. The mixing kneader preferably comprises at least one orifice above the shafts which is configured as a dome, the dome being closed by a displacer (22). In addition, at least one orifice for product withdrawal is provided, whose orifice cross section is adjustable during operation.