Carbon dioxide removal using aminated carbon molecular sieves
First Claim
1. A method of removing an acid gas from a vapor which comprises contacting the vapor and adsorbing at an acid gas adsorption-promoting conditions with an adsorbent which is manufactured by a method which comprises:
- (a) polymerizing a cross-linking agent and a precursor monomer, with both the cross-linking agent and the monomer being essentially free of molecular oxygen, and producing a cross-linked polymer;
(b) shaping a quantity of the polymer into an article having a desired configuration;
(c) carbonizing the resultant shaped article in a substantially oxygen-free environment and converting polymer into carbon molecular sieves;
(d) increasing the pore volume of the carbonized article by contact with steam at 600-1000 degrees C.; and
,(e) contacting the carbonized article with a dihydric alcohol amine compound.
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Accused Products
Abstract
Acid gases such as carbon dioxide are removed from air or other gases using a unique carbon-based material. The material is a carbon molecular sieve prepared from oxygen-free precursors carbonized in the absence of oxygen. The pores of the material are then enlarged as by high temperature steaming. Alcohol amines are then used to impart an amine functionality to the materials. A gas to be treated is contacted with this material at room temperature and atmospheric pressure, with the adsorbed gas being released by heating to a moderate temperature.
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Citations
24 Claims
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1. A method of removing an acid gas from a vapor which comprises contacting the vapor and adsorbing at an acid gas adsorption-promoting conditions with an adsorbent which is manufactured by a method which comprises:
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(a) polymerizing a cross-linking agent and a precursor monomer, with both the cross-linking agent and the monomer being essentially free of molecular oxygen, and producing a cross-linked polymer; (b) shaping a quantity of the polymer into an article having a desired configuration; (c) carbonizing the resultant shaped article in a substantially oxygen-free environment and converting polymer into carbon molecular sieves; (d) increasing the pore volume of the carbonized article by contact with steam at 600-1000 degrees C.; and
,(e) contacting the carbonized article with a dihydric alcohol amine compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of removing carbon dioxide from a gas comprising water, nitrogen and oxygen which comprises contacting the gas and adsorbing carbon dioxide at adsorption promoting conditions with a shaped product comprising a homogeneous molecular sieve material which is made by a series of steps which comprises:
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(a) performing a bulk polymerization of an oxygen-free monomer in the presence of an oxygen-free cross-linking agent, and producing free flow granules of a cross-linked polymer; (b) producing shaped articles from the granules without the use of a binder material; (c) carbonizing the resultant shaped articles in a substantially oxygen-free environment in the presence of an inert gas; (d) reducing the mass of the shaped articles by 25-75 wt. % by contact with steam at an elevated temperature; and
,(e) contacting the carbonized articles with a mono or dihydric alcohol amine compound under conditions which result in the shaped product containing from about 20 to about 65 weight percent dihydric alcohol amine. - View Dependent Claims (14, 15, 16)
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17. An adsorbent comprising a secondary amine functionalized carbon support, which carbon support is produced by a series of steps comprising:
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(a) performing a polymerization of a monomer in the presence of a cross-linking agent, and producing free flowing granules of a substantially oxygen-free cross-linked polymer; (b) producing shaped articles from the granules without the use of a binder material; (c) carbonizing the resultant shaped articles in a substantially oxygen-free environment in the presence of an inert gas; (d) reducing the mass of the shaped articles by 25-75 wt. % by contact with steam at an elevated temperature; and
,(e) contacting the shaped particles with a secondary amine under conditions which produce the functionalized carbon support. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification