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Apparatus for removing arsenic compound
US9399213B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9399213-B2 |
| Application number | US-201514793974-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 8, 2015 |
| Priority date | Mar 29, 2011 |
| Publication date | Jul 26, 2016 |
| Grant date | Jul 26, 2016 |
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- Title
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Abstract
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Provided is a practical method for dry-separating arsenic compounds from a used NOx removal catalyst contaminated with arsenic. The method for removing arsenic compounds comprises heat-treating a NOx removal catalyst contaminated with arsenic compounds at a predetermined temperature in a reducing atmosphere while exposing the catalyst to hydrocarbon compounds (except CH 4 ) or oxygen-containing carbon compound.
First claim
Opening claim text (preview).
The invention claimed is: 1. An apparatus for removing an arsenic compound, comprising a treatment unit which conducts heat-treatment of a NOx removal catalyst contaminated with the arsenic compound at a predetermined temperature in a reducing atmosphere while exposing the catalyst to hydrocarbon compounds except CH 4 or oxygen-containing carbon compounds. 2. The apparatus for removing an arsenic compound according to claim 1 , wherein the hydrocarbon compounds and the oxygen-containing carbon compounds are gaseous at the predetermined temperature. 3. The apparatus for removing an arsenic compound according to claim 1 , wherein the predetermined temperature is in a range of greater than 300° C. to 600° C. 4. The apparatus for removing an arsenic compound according to claim 1 , wherein the treatment unit exposes the NOx removal catalyst contaminated with the arsenic compound in a product form as is or after made into a particle form by grinding treatment to the hydrocarbon compounds or the oxygen-containing carbon compounds. 5. An apparatus for regenerating the NOx removal catalyst by removing the arsenic compound comprising the apparatus according to claim 1 . 6. The apparatus for regenerating a NOx removal catalyst according to claim 5 comprising a heat treatment unit which conducts heat-treatment of the NOx removal catalyst from which the arsenic compound has been removed at 250° C. or more in an oxygen atmosphere.
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Classifications
Controlling the temperature · CPC title
Treating with free oxygen-containing gas · CPC title
of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 · CPC title
Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title
Stationary reactors without moving elements inside · CPC title
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- What does patent US9399213B2 cover?
- Provided is a practical method for dry-separating arsenic compounds from a used NOx removal catalyst contaminated with arsenic. The method for removing arsenic compounds comprises heat-treating a NOx removal catalyst contaminated with arsenic compounds at a predetermined temperature in a reducing atmosphere while exposing the catalyst to hydrocarbon compounds (except CH 4 ) or oxygen-containing…
- Who is the assignee on this patent?
- Mitsubishi Hitachi Power Sys
- What technology area does this patent fall under?
- Primary CPC classification B01J38/04. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 26 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).