Carbonation of metal silicates for long-term CO2 sequestration

Patent metadata

Field	Value
Publication number	US-9718693-B2
Application number	US-201414168272-A
Country	US
Kind code	B2
Filing date	Jan 30, 2014
Priority date	Apr 23, 2003
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

In a preferred embodiment, the invention relates to a process of sequestering carbon dioxide. The process comprises the steps of: (a) reacting a metal silicate with a caustic alkali-metal hydroxide to produce a hydroxide of the metal formerly contained in the silicate; (b) reacting carbon dioxide with at least one of a caustic alkali-metal hydroxide and an alkali-metal silicate to produce at least one of an alkali-metal carbonate and an alkali-metal bicarbonate; and (c) reacting the metal hydroxide product of step (a) with at least one of the alkali-metal carbonate and the alkali-metal bicarbonate produced in step (b) to produce a carbonate of the metal formerly contained in the metal silicate of step (a).

First claim

What is claimed:

1. A process of producing a metal carbonate comprising:
providing each of the following components: a source of magnesium hydroxide, an alkali-metal hydroxide, and a gaseous waste stream containing carbon dioxide;
reacting said components together to form an alkali-metal carbonate or an alkali-metal bicarbonate from the reaction of said carbon dioxide with said alkali-metal hydroxide, while in the presence of said source of magnesium hydroxide; and
reacting magnesium hydroxide from said source of magnesium hydroxide with said alkali-metal carbonate or alkali-metal bicarbonate, as said alkali-metal carbonate or alkali-metal bicarbonate forms in situ, to produce a magnesium carbonate composition.

2. The process according to claim 1 , wherein said alkali-metal carbonate is sodium carbonate, and said magnesium hydroxide is reacted with said sodium carbonate to produce eitelite of the composition Na 2 Mg(CO 3 ) 2 .

3. The process according to claim 1 , wherein said magnesium hydroxide is reacted with said alkali-metal bicarbonate to produce magnesium carbonate along with a hydroxide of the alkali metal.

Assignees

• Ut Battelle Llc
• Univ Tennessee Res Found
• Virginia Museum Of Natural History Found

Inventors

• Blencoe James G
• Palmer Donald A
• Anovitz Lawrence M
• Beard James S

Classifications

• C01F11/181

  Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions · CPC title

• C01F11/18

  Carbonates · CPC title

• B01D53/62 Primary

  Carbon oxides · CPC title

• B01D2251/604

  Hydroxides · CPC title

• C01F5/24

  Magnesium carbonates · CPC title