Patents Assigned to Lonza Societa Per Azioni
  • Process for the regeneration of a catalyst
    Patent number: 5854161
    Abstract: A process is provided for the regeneration of a vanadium-phosphorus oxide catalyst which has been used in a process for the preparation of maleic anhydride by oxidizing butane. The used catalyst particles are removed from the fluidized bed reactor and subjected to impact with each other and/or with structural surfaces such that the deteriorated layer is peeled away. Various forms of equipment may be employed such as pneumatic classifiers, jet mills and jetted fluidized beds.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: December 29, 1998
    Assignees: ABB Lummus Global Inc., Lonza Societa Per Azioni, Tonen Chemical Corporation
    Inventors: Tatsumi Ichiki, Nagato Hamashima, Teiji Nakamura, Masayuki Asami, Sadakatsu Suzuki, Hiroshi Ueno