Clariant International Ltd

Siemens Aktiengesellschaft

Robert Marx

Manfred Schingnitz

Frank Hannemann

Gerhard Mestl

Yeping Cai

Justin X Wang

William M Faris

Ling Xu

Werner Pitschi

Peter Schinke

Nadine Fromm

Doris Klostermann

Oliver Richter

Felix Schulz

David Lesser

Christian Görsch

The invention relates to a catalyst arrangement for preparing phthalic anhydride by gas-phase oxidation of aromatic hydrocarbons, which comprises a reactor having a gas inlet end for a feed gas and a gas outlet end for a product gas and also a first catalyst zone made up of catalyst bodies and at least one second catalyst zone made up of catalyst bodies, where the first catalyst zone is arranged at the gas inlet end and the second catalyst zone is arranged downstream of the first catalyst zone in the gas flow direction and the length of the first catalyst zone in the gas flow direction is less than the length of the second catalyst zone in the gas flow direction, characterized in that the first catalyst zone has a higher gap content compared to the second catalyst zone.

Catalyst arrangement with optimized void fraction for the production of phthalic acid anhydride

A technology for producing synthesis gas from crude gas from various gasification processes for solid or liquid fuels. To limit the temperatures in a subsequent strongly exothermic CO shift reaction to adjust the H/CO ratio, the crude gas which has been freed of dust flows through two shift reactors arranged in series. The first reactor has a specific reaction-kinetically limited catalyst and the second reactor has a conventional sour gas catalyst. The specific catalyst used in the first reactor limits the exothermic shift reaction to such an extent that the reaction temperatures in the first and second reactors remain so low to avoid thermal damage to the catalysts even without introduction of external steam, and the desired gas composition is achieved.

Treatment of synthesis gases from a gasification facility

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Munich, Germany

Robert Marx