Vapor phase oxidation of acrolein to acrylic acid

US6310240A · kind A · utility

Assignees

• E.I. DU PONT DE NEMOURS AND COMPANY · US
• Atofina · FR

Inventors

• Rashmikant Maganlal Contractor · Ardentown, US
• Mark William Andersen · Charlottesville, US
• Daniel Campos · Atglen, US
• Gerard Hecquet · Courbevoie, FR
• Charlotte Pham · Saverne, FR
• Michel Simon · Ramonville-Saint-Agne, FR
• Mireille Stojanovic · Paris, FR
• Roland Kotwica · Pontpoint, FR
• Jean-Pierre Schirmann · Paris, FR

Key dates

• Filing date: Dec 23, 1998
• Grant date: Oct 30, 2001
• Expiry date: Dec 23, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved method for the selective vapor phase oxidation of acrolein to acrylic acid in a recirculating solids reactor system using a particulate molybdenum vanadate multimetal oxide as oxidant involving specific reactant concentrations (preferably 5 mol % to 30 mol % propylene, 0 to 20 mol % oxygen, 0 to 70 mol % water, and the remainder inert gas), solids particle size (20 to 300 micrometers), temperature (250 to 450.degree. C.) and gas (1 to 15 seconds) and solids (2 to 60 seconds) residence times. Such a process leads to improved selectivity, conversion and solids conversion ratio.