Carbon dixide adsorption of synthetic meixnerite

• US 5,882,622 A
• Filed: 04/09/1997
• Issued: 03/16/1999
• Est. Priority Date: 06/07/1995
• Status: Expired due to Term

• Current Assignee: Almatis AC, Inc. (BASF SE)
• Original Assignee: Aluminum Company of Egypt
• Inventors: Horn, William E., Easley, Michael A.
• Primary Examiner(s): LANGEL, WAYNE A
• Application Number:
  US08/842,934
• Time in Patent Office: 706 Days
• Field of Search: 423/600, 423/230
• US Class Current: 423/600
• CPC Class Codes: C01F 7/785 Hydrotalcite
• CPC Class Codes: C01P 2002/22 layered hydroxide-type, e.g. of the hydrotalcite-type
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/13 thermal stability thereof at high temperatures

Abstract

A method for making an essentially unsaturated synthetic meixnerite with high CO₂ adsorption abilities. The method comprises activating hydrotalcite, then cooling and rehydrating such activated material in a carbon dioxide-free environment. The resultant material can absorb more than 10 milliliters of CO₂ per gram.

Claims

1. A method for making synthetic meixnerite having a high CO₂ adsorption rate, said method comprising:

(a) activating a magnesium aluminum material at one or more temperatures greater than 550°

C. and less than 850°

C.;

(b) cooling said activated material in a substantially carbon dioxide-free environment; and

then

(c) hydrating said material in a substantially carbon dioxide-free environment.

2. The method of claim 1 wherein said meixnerite is capable of adsorbing CO₂ from a fluid.

3. The method of claim 2 wherein said meixnerite is capable of adsorbing at least about 10 milliliters of CO₂ per gram of said meixnerite from said fluid.

4. The method of claim 2 wherein said meixnerite is capable of adsorbing about 14 milliliters of CO₂ or more per gram of said meixnerite from said fluid.

5. The method of claim 1 wherein hydrating step (c) takes place in a gas environment saturated with water vapor.

6. The method of claim 1 wherein hydrating step (c) occurs in a liquid environment.