Carbonation of metal silicates for long-term co2 sequestration

B - Operations – Transporting – 01 – D

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B01D 53/62 (2006.01)

Patent

CA 2523135

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).

Dans un mode de réalisation préféré, l'invention concerne un procédé pour séquestrer le dioxyde de carbone selon les étapes suivantes: (a) mettre à réagir un silicate métallique avec un hydroxyde de métal alcalin caustique pour produire un hydroxyde du métal précédemment contenu dans le silicate; (b) mettre à réagir du dioxyde de carbone avec au moins un hydroxyde de métal alcalin caustique ou un silicate de métal alcalin pour produire au moins un carbonate de métal alcalin ou un bicarbonate de métal alcalin; (c) mettre à réagir l'hydroxyde métallique obtenu à l'étape (a) avec au moins le carbonate de métal alcalin ou le bicarbonate de métal alcalin obtenu à l'étape (b) pour produire un carbonate du métal précédemment contenu dans le silicate métallique de l'étape (a).

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