Active carbon of high surface area prodn. - in vertical reactor having prim. zone with spaced air injection points and sec. zone with steam injection

• Main Author: MACK D. BOWEN ET KENNETH R. PURDY
• Format: Patent
• Language: English; French
• Published: 30.04.1982
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

Single-pass, self-sustaining, continuous process comprises introducing to the top of a vertical reactor a dry feed capable of thermal decomposition to a gaseous component and a solid activated carbonaceous prod. The material is continuously moved, as a packed bed and at a predetermined rate, downwardly through and outwardly from the bottom of the reactor, while gases are withdrawn upwardly and outwardly. Air is injected at vertically spaced levels to establish a primary activation zone. The air is injected at the levels at different rates, independently controlled so as to distribute the air and render the primary zone isothermal, with the material at 1400 degrees-2100 degrees F. Down from the primary zone, low temp. steam, in the absence of oxygen, is injected to establish a secondary activation zone below the primary zone. The steam is injected at a rate to transport sufficient thermal energy from the secondary activation zone to the top of the bed for drying and thermal decomposition of the feed material. PROCEDE CONTINU ET AUTO-ENTRETENU, EN UNE UNIQUE ETAPE, DE PRODUCTION DE MATIERE CARBONEE ACTIVEE. LA MATIERE PREMIERE EST INTRODUITE AU SOMMET D'UN REACTEUR VERTICAL 10 DE MANIERE QU'ELLE DESCENDE EN UN LIT COMPACT PREALABLEMENT SECHE ET DE L'AIR EST INJECTE A PLUSIEURS NIVEAUX 120A-120E QUI SONT DISTANTS LES UNS DES AUTRES VERTICALEMENT DE MANIERE A CREER UNE PREMIERE ZONE D'ACTIVATION C QUI EST SENSIBLEMENT ISOTHERME, DE LA VAPEUR D'EAU A BASSE TEMPERATURE ETANT PAR AILLEURS INJECTEE DANS UNE SECONDE ZONE D'ACTIVATION D A L'INTERIEUR DU LIT EN UN EMPLACEMENT 122 QUI EST A DISTANCE AU-DESSOUS DE LA PREMIERE ZONE, LE DEBIT DE CETTE VAPEUR CONVENANT JUSTE AU TRANSPORT D'UNE QUANTITE SUFFISANTE D'ENERGIE THERMIQUE VERS LE SOMMET DU LIT POUR PROVOQUER LE SECHAGE ET LA DECOMPOSITION THERMIQUE DE LA MATIERE PREMIERE.APPLICATION A LA PRODUCTION DE CHARBON ACTIF AYANT UNE SURFACE SPECIFIQUE SUPERIEURE A 400 MG.