Process for producing supported ruthenium on silica modified titania and process for producing chlorine

Patent metadata

Field	Value
Publication number	US-9186652-B2
Application number	US-201214358427-A
Country	US
Kind code	B2
Filing date	Dec 5, 2012
Priority date	Dec 7, 2011
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

An object of the invention is to provide a process for producing a supported ruthenium oxide in which silica can be efficiently supported on a titania carrier and a supported ruthenium oxide superior in thermal stability and catalyst lifetime is obtained. Another object of the present invention is to provide a process for stably producing chlorine for a longer time, by using the supported ruthenium oxide obtained by the above-described process. The invention relates to a process for producing a supported ruthenium oxide in which ruthenium oxide and silica are supported on a titania carrier, wherein a titania carrier is brought into contact with an alkoxysilane compound, followed by being dried under a stream of a water vapor-containing gas, then is subjected to a first calcination under an atmosphere of an oxidizing gas, followed by being brought into contact with a ruthenium compound, and then is subjected to a second calcination under an atmosphere of an oxidizing gas. Chlorine is produced by oxidizing hydrogen chloride with oxygen in the presence of the supported ruthenium oxide thus produced, as a catalyst.

First claim

The invention claimed is:

1. A process for producing a supported ruthenium oxide in which ruthenium oxide and silica are supported on a titania carrier, wherein a titania carrier is brought into contact with an alkoxysilane compound, followed by being dried under a stream of a water vapor-containing gas, then is subjected to a first calcination under an atmosphere of an oxidizing gas, followed by being brought into contact with a ruthenium compound, and then is subjected to a second calcination under an atmosphere of an oxidizing gas,
wherein, in the drying, a space velocity of the water vapor-containing gas for the titania carrier is 10-2000/h in the standard state.

2. The process of claim 1 , wherein a water vapor concentration in the water vapor-containing gas is 0.5 to 10% by volume.

3. The process of claim 1 , wherein a ratio of rutile type titania in the titania carrier to total of the rutile type titania and anatase type titania is 50% or more, when measured by the X-ray diffraction method.

4. The process of claim 1 , wherein the alkoxysilane compound is a tetraalkoxysilane.

5. The process of claim 4 , wherein the tetraalkoxysilane is tetraethoxysilane.

6. A process for producing chlorine, wherein hydrogen chloride is oxidized with oxygen in the presence of a supported ruthenium oxide produced by the process defined in claim 1 .

7. The process of claim 2 , wherein a ratio of rutile type titania in the titania carrier to total of the rutile type titania and anatase type titania is 50% or more, when measured by the X-ray diffraction method.

8. The process of claim 2 , wherein the alkoxysilane compound is a tetraalkoxysilane.

9. A process for producing chlorine, wherein hydrogen chloride is oxidized with oxygen in the presence of a supported ruthenium oxide produced by the process defined in claim 2 .

Assignees

• Sumitomo Chemical Co

Inventors

• Nishimoto Junichi

Classifications

• B01J23/462 Primary

  Ruthenium · CPC title

• B01J37/0244

  Coatings comprising several layers · CPC title

• B01J37/10

  in the presence of water, e.g. steam · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• C01B7/04

  Preparation of chlorine from hydrogen chloride · CPC title