CATALYST AND METHOD FOR PRODUCING MALEIC ANHYDRIDE

• US 20150343433A1
• Filed: 08/11/2015
• Published: 12/03/2015
• Est. Priority Date: 12/22/2008
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: DOBNER, Cornelia Katharina, ALTWASSER, Stefan, WILMER, Hagen, ROSOWSKI, Frank
• Granted Patent: US 10,022,714 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B01J 27/198 Vanadium
• CPC Class Codes: B01J 35/00 Catalysts, in general, characterised by their form or physical properties
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 35/40 characterised by dimensions, e.g. grain size in a colloidal state B01J35/23; crystallite size B01J35/77
• CPC Class Codes: B01J 35/50 characterised by their shape or configuration
• CPC Class Codes: B01J 35/633 less than 0.5 ml/g
• CPC Class Codes: B01J 35/635 0.5-1.0 ml/g
• CPC Class Codes: B01J 37/0009 Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
• CPC Class Codes: B01J 37/0018 Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
• CPC Class Codes: C07C 51/215 of saturated hydrocarbyl groups
• CPC Class Codes: C07C 57/145 Maleic acid
• CPC Class Codes: Y10T 428/2975 Tubular or cellular

Abstract

The invention relates to a catalyst molded body for preparing maleic anhydride by gas-phase oxidation of a hydrocarbon having at least four carbon atoms using a catalytically active composition containing vanadium, phosphorus and oxygen. The shaped catalyst body has an essentially cylindrical body having a longitudinal axis. The cylindrical body has at least two parallel internal holes which are essentially parallel to the cylinder axis of the body and go right through the body. The catalyst molded body has a large outer surface area, a lower pressure loss and sufficient mechanical stability.

Claims

1. A shaped catalyst body for preparing maleic anhydride by gas-phase oxidation of a hydrocarbon having at least four carbon atoms using a catalytically active composition comprising vanadium, phosphorus and oxygen, where the shaped catalyst body has an essentially cylindrical body having a longitudinal axis, wherein the cylindrical body has at least two parallel internal holes which are essentially parallel to the cylinder axis of the body and go right through the body.

2. The shaped catalyst body according to claim 1, wherein the central axes of the internal holes are located equidistantly on a cylindrical surface which is concentric with the surface of the cylindrical body.

3. The shaped catalyst body according to claim 1, wherein the cylindrical body has four internal holes.

4. The shaped catalyst body according to claim 1, wherein the sum of the surfaces of the internal holes is equal to or greater than the external surface of the cylindrical body.

5. The shaped catalyst body according to claim 1, wherein both the smallest distance between the internal holes and the smallest distance between the internal holes and the outer cylindrical surface of the body is in each case at least 6% of the diameter of the cylindrical body.

6. The shaped catalyst body according to claim 1, wherein the ratio of the geometric surface A_geo to the geometric volume V_geo is at least 2.0 mm⁻

1.

7. The shaped catalyst body according to claim 1, wherein the ratio of the geometric volume V_geo of the cylindrical body to the theoretical volume V_overall of a corresponding solid cylinder having the same height h and the same external diameter d₁ is not more than 0.85.

8. The shaped catalyst body according to claim 1, wherein the external diameter d₁ of the cylindrical body is from 3 to 10 mm, the height h of the cylindrical body is from 1 to 10 mm and the diameter of each internal hole d₂ is from 0.5 to 4 mm.

9. The shaped catalyst body according to claim 1, wherein the shaped catalyst body is porous.

10. The shaped catalyst body according to claim 9, wherein the shaped catalyst body has a specific pore volume of at least 0.30 ml/g.