摘要:
The invention relates to a catalyst arrangement for the production of phthalic anhydride by gas phase oxidation of aromatic hydrocarbons, comprising a reactor having a gas inlet side for a reactant gas and a gas outlet side for a product gas, and a first catalyst layer that consists of catalyst bodies and at least a second catalyst layer that consists of catalyst bodies, the first catalyst layer being arranged on the gas inlet side and the second catalyst layer being arranged downstream of the first catalyst layer in the gas flow direction, and the length of the first catalyst layer being shorter in the gas flow direction than the length of the second catalyst layer in the gas flow direction, characterized in that the first catalyst layer has a higher void fraction than the second catalyst layer.
摘要:
The invention relates to a catalytic converter arrangement for producing phthalic anhydride by means of a gas phase oxidation of aromatic hydrocarbons, comprising a reactor with a gas inlet side for a reactant gas, a gas outlet side for a product gas, a first catalytic converter layer made of catalytic converter elements, and at least one second catalytic converter layer made of catalytic converter elements. The first catalytic converter layer is arranged on the gas inlet side, and the second catalytic converter layer is arranged downstream of the first catalytic converter layer in the gas flow direction. The catalytic converter elements have an outer layer of an active compound. The invention is characterized in that the active compound content in the first catalytic converter layer and/or in the second catalytic converter layer is below 7 wt.%, based on the total weight of the catalytic converter elements, and the ratio of the total surface of the active compound to the volume of the catalytic converter layer is preferably 10000 cm -1 to 20000 cm -1 , particularly preferably 12000 cm -1 to 16000 cm -1 , in each catalytic converter layer.