Initiation method of a method for producing 2,2-bis(4-hydroxyphenyl)propane

US6590128B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Michael Bödiger · Dormagen, DE
• Rainer Neumann · Krefeld, DE
• Frieder Heydenreich · Düsseldorf, DE
• Michael Prein · Brasschaat, BE
• Hans-Ludwig Fofonka · Willich, DE

Key dates

• Filing date: Sep 5, 2002
• Grant date: Jul 8, 2003
• Expiry date: Sep 5, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the commissioning of a process for the production of 2,2-bis(4-hydroxyphenyl)propane is disclosed. The process that entails reacting phenol with acetone in the presence of sulfonated cross-linked polystyrene resins is characterized in that the commissioning takes place with an acetone concentration reduced below, and a phenol concentration increased above, that of the optimal sustained operation state, with a reduced quantitative throughput, and in that with temperature control, the reactant quantity and the acetone content of the reactor feed are subsequently increased until the sustained operating state is reached.