Paraffin dehydrogenation using platinum-tin promoted zinc aluminate catalyst and silica-free particles

• US 4,041,099 A
• Filed: 09/03/1976
• Issued: 08/09/1977
• Est. Priority Date: 01/07/1972
• Status: Expired due to Term

• Current Assignee: Phillips Petroleum Company (ConocoPhillips)
• Original Assignee: Phillips Petroleum Company (ConocoPhillips)
• Inventors: Hutson, Thomas Jr.
• Primary Examiner(s): O'Keefe, Veronica
• Application Number:
  US05/720,317
• Time in Patent Office: 340 Days
• Field of Search: 260/683.3, 260/683, 260/666 A, 260/668 D, 23/288 R
• US Class Current: 585/434
• CPC Class Codes: B01J 2208/00407 outside the reactor bed
• CPC Class Codes: B01J 2208/00495 using insulating materials or refractories
• CPC Class Codes: B01J 8/02 with stationary particles, e.g. in fixed beds
• CPC Class Codes: C07C 5/325 of the platinum group
• CPC Class Codes: Y10S 585/921 using recited apparatus structure

Abstract

A method and an improved platinum-tin promoted zinc aluminate catalyst reactor for dehydrogenation of a paraffinic hydrocarbon feed stream as first and second layers of silica-free particles, each positioned in contact with and on opposed surfaces of the catalyst across the direction of feed stream flow through the reactor for preventing the poisoning of said catalyst.

Claims

1. A process for dehydrogenating a hydrocarbon feedstock comprising alkanes, cycloalkanes, arylalkanes or mixtures thereof in which the feedstock is dehydrogenated in contact with a layer of platinum-tin promoted zinc aluminate catalyst, said process comprising maintaining a first and a second layer of silica-free particles with the catalyst layer arranged between these layers of silica-free particles and passing the feed stream through one of said first and second layers of silica-free particles and thereafter through the catalyst layer.

2. A process in accordance with claim 1 wherein said feed stream is passed into a reactor having inlet and outlet ends and wherein at least partially dehydrogenated feedstock is withdrawn from the outlet end of said reactor and wherein said first and second layers of silica-free particles separate said catalyst from the inlet and outlet ends of the reactor.

3. A process in accordance with claim 1 wherein said feed stream is passed through first and second layers of silica-free stainless steel particles.