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:
May. 16, 1995
Filed:
Oct. 25, 1993
Frederick S Baker, Wando, SC (US);
Westvaco Corporation, New York, NY (US);
Abstract
A two-stage process for chemical activation of lignocellulose-derived carbon is disclosed comprising a first activation stage of blending a lignocellulose material with phosphoric acid, carbonizing the blend at from about 300.degree. F. to about 1,100.degree. F. (about 150.degree.-590.degree. C.), and water washing the carbonized material and a second activation stage of blending the carbonized material with a potassium hydroxide solution, activating this blend at from about 1,200.degree. to about 1,800.degree. F. (about 650.degree.-980.degree. C.), and water washing and drying the microporous activated carbon product, which is characterized by greater than 50% of its total pore volume comprising pores of less than 16 .ANG. in width and greater than 80% of its total pore volume comprising pores of less than 20 .ANG. in width and greater than 95% of its total pore volume comprising pores of less than 50 .ANG. in width.