Mixed oxide compositions and process for preparing isoolefins

• US 9,371,255 B2
• Filed: 03/07/2012
• Issued: 06/21/2016
• Est. Priority Date: 03/16/2011
• Status: Active Grant

• Current Assignee: Evonik Oxeno GmbH & Company KG (Rag-Stiftung)
• Original Assignee: Evonik Degussa GmbH
• Inventors: Bing, Christian, Nau, Asli, Isfort, Christian Schulze, Winterberg, Markus, Maschmeyer, Dietrich, Zanthoff, Horst-Werner, Quandt, Thomas
• Primary Examiner(s): Zimmer, Anthony J
• Application Number:
  US14/005,479
• Publication Number:
  US 20140087940A1
• Time in Patent Office: 1,567 Days
• US Class Current: 1/1
• CPC Class Codes: B01J 21/12 Silica and alumina
• CPC Class Codes: B01J 23/002 Mixed oxides other than spinels, e.g. perovskite
• CPC Class Codes: B01J 23/04 Alkali metals
• CPC Class Codes: B01J 2523/00 Constitutive chemical elements of heterogeneous catalysts
• CPC Class Codes: B01J 2523/12 Sodium
• CPC Class Codes: B01J 2523/31 Aluminium
• CPC Class Codes: B01J 2523/41 Silicon
• CPC Class Codes: B01J 2523/51 Phosphorus
• CPC Class Codes: B01J 27/16 containing oxygen , i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
• CPC Class Codes: B01J 27/1806 with alkaline or alkaline earth metals
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 35/396 Distribution of the active metal ingredient
• CPC Class Codes: B01J 35/613 10-100 m2/g
• CPC Class Codes: B01J 35/615 100-500 m2/g
• CPC Class Codes: B01J 37/10 in the presence of water, e.g. steam
• CPC Class Codes: B01J 37/28 Phosphorising
• CPC Class Codes: C07C 1/213 by splitting of esters
• CPC Class Codes: C07C 1/22 by reduction
• CPC Class Codes: C07C 11/09 Isobutene
• CPC Class Codes: C07C 2521/08 Silica
• CPC Class Codes: C07C 2523/04 : Alkali metals
• CPC Class Codes: C07C 2529/70 : of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65
• CPC Class Codes: C07C 29/00 : Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
• CPC Class Codes: Y02P 20/52 : using catalysts, e.g. selective catalysts
• CPC Class Codes: Y02P 20/582 : Recycling of unreacted starting or intermediate materials

Abstract

The present invention relates to mixed oxide compositions, to the use thereof as a catalyst for cleavage of alkyl tert-alkyl ethers or tertiary alcohols, and to a process for cleaving alkyl tert-alkyl ethers or tertiary alcohols to isoolefins and alcohol or water.

Claims

1. A process, comprising:

cleaving a starting compound of formula II;

2. The process according to claim 1, wherein the starting compound is methyl tert-butyl ether.

3. The process according to claim 1, wherein the starting compound is tert-butyl alcohol.

4. The process according to claim 3, wherein the starting compound is tert-butanol in an azeotropic mixture with water.

5. The process according to claim 1, wherein the cleaving is at a temperature of from 110 to 450°

C.

6. The process according to claim 1, wherein the cleaving is at a pressure of from 0.1 to 2 MPa(abs).

7. A process, comprising:

cleaving a starting compound of formula II;