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Nanoclay-based solid sorbents for carbon dioxide capture

  • US 10,507,453 B2
  • Filed: 11/01/2012
  • Issued: 12/17/2019
  • Est. Priority Date: 11/04/2011
  • Status: Expired due to Fees
First Claim
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1. A regenerative nanoclay based solid sorbent consisting essentially of:

  • a layered nanoclay with at least one surface, andat least one amine containing compound that is immobilized to the surface of said nanoclay by coating the substantial entirety of said surface forming an immobilized amine, wherein said immobilized amine is easily removable from said surface of said nanoclay by washing or frictional mechanical means; and

    at least another amine containing compound that is grafted onto the at least one surface of said nanoclay, wherein said grafted amine compound is not easily removable from said surface of said nanoclay by washing or frictional mechanical means, wherein said grafted amine compound is selected from the group consisting of an organoamine and an aminosilane, wherein said surface of said nanoclay includes at least one of an edge of a platelet of said nanoclay, an interior portion of said nanoclay, and an exterior portion of said nanoclay, and at least one edge of a platelet, an interior portion, and an exterior portion of each layer of said nanoclay, wherein said layered nanoclay adsorbs carbon dioxide at a temperature ranging from 50°

    C. to 85°

    C. and desorbs carbon dioxide in the presence of carbon dioxide at a temperature ranging from 100°

    C. to 155°

    C. for a resultant multiple cycle regenerative nanoclay based solid sorbent for producing a pure carbon dioxide stream, and wherein said layered nanoclay has a sustainable carbon dioxide capacity of at least 85 percent of an initial carbon dioxide capacity after three cycles of regeneration, wherein said nanoclay is selected from the group consisting of a montmorillonite, a bentonite, a kaolinite, a halloysite, and a synthetic nanoclay.

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