Processes for production of isobutene and tertiary butanol

Patent metadata

Field	Value
Publication number	US-9145342-B2
Application number	US-201314136404-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Nov 1, 2005
Publication date	Sep 29, 2015
Grant date	Sep 29, 2015

Abstract

An object of the present invention is to provide, for the production of isobutene, a high-yielding, highly-selective, and long-term stable production process of isobutene from TBA. With respect to the production of TBA, an object of the present invention is to provide a TBA production process in which, through long-term stable maintenance of a high reaction activity, long-term continuous operation is enabled and the productivity is improved. The present invention discloses a process for producing isobutene that employs a dehydration temperature of from 200 to 450° C. in use of an alumina catalyst that contains a Na content of 0.6% by weight or less in terms of NaO 2 and a Na content of 0.4% by weight in terms of NaO 2 , and has a specific surface area of from 200 to 600 m 2 /g.

First claim

The invention claimed is:

1. A process for producing isobutene using tert-butanol as a starting material, comprising:
carrying out a dehydration reaction in a gas phase at a reaction temperature of from 200 to 450° C. using an alumina catalyst which has a Na content in a range of from 0.1 to 0.6% by weight in terms of Na 2 O and a Si content of not more than 0.4% by weight in terms of SiO 2 , and which has a specific surface area of from 200 to 600 m 2 /g.

2. The process for producing isobutene according to claim 1 , wherein the alumina catalyst has a total pore volume in the catalyst of from 0.1 to 0.5 cc/g and has a pore volume of pores having a pore radius of at least 70 Å, the pore volume being at least 60% of the total pore volume.

3. The process for producing isobutene according to claim 1 , wherein the tert-butanol is produced by a process that produces tert-butanol from a hydrocarbon mixture containing isobutene and n-butene by selectively hydrating the isobutene using an aqueous catalyst solution containing water and a heteropolyacid catalyst.

Assignees

• Asahi Kasei Chemicals Corp

Inventors

• Yamaguchi Tatsuo
• Noda Hiroyuki
• Watanabe Toru
• Kirino Shunya

Classifications

• B01J35/1019

  Operations & Transport · mapped topic

• C07C1/24 Primary

  by elimination of water · CPC title

• B01J35/108

  Operations & Transport · mapped topic

• B01D3/009

  in combination with chemical reactions · CPC title

• C07C31/12

  containing four carbon atoms · CPC title