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Matched Legal Cases: ['Application No. 92145679', 'Application No. 9295517', 'Application No. 92241473', 'Application No. 9133147', 'Application No. 53', 'Application No. 61', 'Application No. 63', 'Application No. 63', 'Application No. 2', 'Application No. 4', 'Application No. 63', 'Application No. 4', 'Application No. 4']

Patent US6863713 - Method to adsorb an adsorbate using modified carbonaceous material - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn adsorbent composition containing a modified carbonaceous material capable of adsorbing an adsorbate is disclosed, wherein at least one organic group is attached to the carbonaceous material. Furthermore, methods to increase the adsorption capacity of a carbonaceous material capable of adsorbing an...http://www.google.com/patents/US6863713?utm_source=gb-gplus-sharePatent US6863713 - Method to adsorb an adsorbate using modified carbonaceous materialAdvanced Patent SearchPublication numberUS6863713 B1Publication typeGrantApplication numberUS 09/475,385Publication dateMar 8, 2005Filing dateDec 30, 1999Priority dateJun 14, 1996Fee statusPaidAlso published asCA2258189A1, CN1113692C, CN1227509A, EP0909212A1, EP0909212B1, US20050119121, WO1997047382A1Publication number09475385, 475385, US 6863713 B1, US 6863713B1, US-B1-6863713, US6863713 B1, US6863713B1InventorsRanjan Ghosal, James A. Belmont, Douglas M. Smith, Jameel MenashiOriginal AssigneeCabot CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (119), Non-Patent Citations (96), Referenced by (12), Classifications (18), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod to adsorb an adsorbate using modified carbonaceous material
US 6863713 B1Abstract
An adsorbent composition containing a modified carbonaceous material capable of adsorbing an adsorbate is disclosed, wherein at least one organic group is attached to the carbonaceous material. Furthermore, methods to increase the adsorption capacity of a carbonaceous material capable of adsorbing an adsorbate and methods to adsorb an adsorbate using the above-described adsorbent composition are also disclosed.
This invention relates to carbon adsorbents made from modified carbonaceous materials and also relates to a method of using these adsorbents, including a method to increase the adsorption capacity and/or alter the adsorption affinity of carbonaceous materials capable of adsorbing an adsorbate.
Adsorption is an important operation in many industrial processes. The effectiveness of an adsorbent depends, primarily, on its surface area, pore structure, and surface chemistry. The nature of the adsorbate which is to be adsorbed frequently dictates the chemical nature of the adsorbent. For example, carbonaceous adsorbents are often used to selectively remove organic compounds from liquid, gaseous, or vapor media. Silica and alumina based adsorbents are employed to selectively adsorb polar adsorbates such as water, ammonia, and the like from similar media.
To achieve these and other advantages and in accordance with the purposes of the present invention, as embodied and broadly described herein, the present invention relates to an adsorbent composition containing a modified carbonaceous material capable of adsorbing an adsorbate.
FIG. 1 is a graph plotting the amount of water adsorption on modified and unmodified carbon black.
In further detail, an adsorbent composition of the present invention contains a modified carbonaceous material capable of adsorbing an adsorbate wherein at least one organic group is attached to the carbonaceous material.
The effectiveness of the surface modification of exemplary carbonaceous material was determined by comparing the adsorption isotherms of various adsorbates on the unmodified carbonaceous materials, with adsorption isotherms on the carbonaceous materials modified in accordance with the present invention. Adsorbates used were water and CO2, but other adsorbates could also be used.
Pellets of Black Pearls� 430 carbon black and Darco S51 activated carbon from Norit were surface-modified using the following procedure:
Surface Modification of Black Pearls� 430 Carbon Black
A dispersion of 5 ml of water dilutable phenol-formaldehyde thermosetting resin (Schenectady International, Schenectady, N.Y.) in 50 mL of water was mixed with 50 g of Black Pearls� 430 carbon black (available from Cabot Corp., Boston, Mass.). The mixture was pressed in 1 g portions using a 0.25 inch stainless steel die at a pressure of 5000 psi. The pellets were heated under flowing argon at 110� C. for one hour and at 135� C. for one hour to cure the resin. The temperature was then raised under flowing argon at 20� C./min until a temperature of 650� C. was reached. The temperature was then held at 650� C. for three hours and cooled under flowing argon. The pellets were then crushed into pieces about 1 mm by 2 mm.
Surface Modification of Activated Carbon
An aqueous solution of 30.5 g of sodium nitrite in about 100 g of water was added to a boiling mixture of 130 g of DARCO S51 activated carbon (available from Norit), 76.5 g of sulfanilic acid, and 1300 g of water. After stirring for 15 minutes, the heating was discontinued and the mixture was allowed to cool to room temperature with stirring. The resulting material was dried overnight in an oven at 50� C.
The surface modified carbons were washed with a large amount of deionized water and dried. The material thus obtained was in the sodium form. Further modification of the carbon into potassium and lithium forms was carried out by ion exchange using 2M solutions of KOH and LiOH, respectively. The ion-exchanged material was washed thoroughly and dried. Adsorption experiments were carried out on the washed, dried materials.
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