The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 1992
Filed:
Jul. 19, 1990
Orlando Leal, Caracas, VE;
Carmelo Bolivar, Caracas, VE;
Gonzalo Sepulveda, Caracas, VE;
Gregorio Molleja, Caracas, VE;
German Martinez, Carabobo, VE;
Leon Esparragoza, Caracas, VE;
Armada de la Republica de Venezuela, San Bernardino, VE;
Universidad Central de Venezuela, Caracas, VE;
Abstract
A reversible adsorbent for carbon dioxide, which can be used as a decontaminant of closed environments, has been devised. It consists of a novel material formed by a surface modified silica gel with active sites for the chemisorption of CO.sub.2 at room temperature combined with a clay which acts as an agglomerant in a preferred weight ratio of 80/20. The carbon dioxide is liberated under heating at 110.degree. C. The surface area of the material ranges between about 120 and about 240 m.sup.2 /g with a total pore volume between about 0.4 and about 0.8 cc/g where about 80% of the total pore volume contains pores of a diameter between about 60 .ANG. and about 180 .ANG.. The material is capable of adsorbing between about 7.5 and 11.7 cc of dry CO.sub.2 per gram and can be regenerated between about 70.degree. and about 150.degree. C. without losing any adsorptive capacity. Dry carbon dioxide is chemisorbed as a surface ammonium carbamate which becomes a surface bicarbonate in the presence of water.