Dehydrogenation of saturated hydrocarbons

• US 4,070,413 A
• Filed: 10/28/1976
• Issued: 01/24/1978
• Est. Priority Date: 10/28/1976
• Status: Expired due to Term

• Current Assignee: UOP Des Plaines IL A NY General Partnership
• Original Assignee: UOP Llc (Honeywell International Inc.)
• Inventors: Imai, Tamotsu
• Primary Examiner(s): O'Keefe, Veronica
• Application Number:
  US05/736,281
• Time in Patent Office: 453 Days
• Field of Search: 260/683.3, 260/666 A
• US Class Current: 585/661
• CPC Class Codes: B01J 23/58 with alkali- or alkaline earth metals
• CPC Class Codes: B01J 23/626 with tin
• CPC Class Codes: B01J 37/10 in the presence of water, e.g. steam
• CPC Class Codes: C07C 11/02 Alkenes
• CPC Class Codes: C07C 5/325 of the platinum group
• CPC Class Codes: C07C 5/3337 of the platinum group

Abstract

Paraffinic hydrocarbons are dehydrogenated in contact with a catalytic composite comprising from about 0.01 to about 2.0 wt. % Group VIII metal and from about 0.01 to about 0.1 wt. % lithium impregnated on an alumina support, said alumina having been hydrothermally treated in steam at a temperature of from about 800° to about 1200° C.

Claims

1. A process for dehydrogenating a paraffinic hydrocarbon which comprises contacting said hydrocarbon at dehydrogenation reaction conditions including a temperature of from about 400°

to about 700°

C. with a catalytic composite of from about 0.01 to about 2.0 wt. % Group VIII metal component and from about 0.01 to about 0.1 wt. % of an alkali metal or alkaline earth metal component with a precalcined alumina support which has been hydrothermally treated with steam at a temperature of from about 800°

to about 1200°

C. after its calcination and prior to the compositing of said metal components therewith.

2. The process of claim 1 further characterized in that said catalytic composite contains a tin component in from about a 0.5:

1 to about a 2;

1 atom ratio with a Group VIII metal component thereof.

3. The process of claim 1 further characterized in that said hydrothermal treatment comprises heating said alumina support in an atmosphere comprising from about 5 to about 50 vol. % steam at a temperature of from about 800°

to about 1200°

C.

4. The process of claim 1 further characterized in that said hydrothermal treatment comprises heating said alumina support in an atmosphere comprising from about 20 to about 40 vol. % steam at a temperature of from about 900°

to about 1100°

C.

5. The process of claim 1 further characterized in that said Group VIII metal is a metal of the platinum group of Group VIII.

6. The process of claim 1 further characterized in that said Group VIII metal is platinum.

7. The process of claim 1 further characterized in that said hydrothermally treated alumina support is, prior to said treatment, a gamma-alumina support.

8. The process of claim 1 further characterized in that said hydrothermally treated alumina support is, prior to said treatment, a gamma-alumina support characterized by an ABD of from about 0.25 to about 0.45 grams per cubic centimeter.

9. The process of claim 1 further characterized in that said paraffinic hydrocarbon contains from about 3 to about 18 carbon atoms.

10. The process of claim 1 further characterized in that said paraffinic hydrocarbon is n-heptane.

11. The process of claim 1 further characterized in that said paraffinic hydrocarbon is n-decane.