Production of strong active carbon moldings

US3960761A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Alex Burger
• Hermann Kaiser · Utica, US
• Werner Ludovici · Odenthal, DE

Key dates

• Filing date: Apr 23, 1974
• Grant date: Jun 1, 1976
• Expiry date: Apr 23, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B32/384
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the production of break-resistant and abrasion-resistant shaped structures of active carbon, comprising the steps of molding a finely divided, carbon-containing starting material with a binder, hardening the molding, eliminating volatile constituents from the molding composition and activating the moldings at a temperature of about 700.degree. to 1200.degree.C with at least one of steam and carbon dioxide, the improvement which comprises molding the carbon-containing material with a binder comprising a mixture of a phenol and an aldehyde or a condensation product thereof. The carbon-containing starting material may contain volatiles and hardening is effected in two stages with elimination of volatiles, the first stage up to about 150 to 200.degree.C and the second stage up to about 600 to 700.degree.C. The moldings are characterized by a benzene-adsorption capacity in excess of about 25 %, a methylene blue number of at least about 10, an abrasion of less than about 0.6 %, a breakage of less than about 0.8 % and a compression hardness of at least about 15 kp.