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1. (US5538932) Preparation of high activity, high density activated carbon with activatable binder
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What is claimed is:
1. A method for preparing a high activity, high density activated carbon derived from lignocellulose material comprising the steps of:
(a) blending together fragments of the lignocellulosic material with a chemical activation agent selected from the group consisting of phosphoric acid and zinc chloride to produce an acid char;
(b) heat treating the acid char at a temperature greater than 185° C. to effect both plasticization and drying of the acid char material to a moisture content of up to about 25% by weight;
(c) densifying the heat treated acid char material by sequentially pulverizing the material into fine particles followed by agglomeration of the fine particles in the presence of moisture and an activatable binder material, at a binder-to-char weight basis ratio of from about 0.05:1 to about 0.1:1, to form generally high density, spherical shaped, agglomerated carbon in a pin mixer;
(d) shaping, by extruding, a mass of the high density, spherical, agglomerated carbon to produce extruded high density carbon pellets; and
(e) activating the high density carbon pellets by heating gradually up to a final activation temperature of from about 400° C. to about 600° C., wherein the high activity, high density activated carbons produced are characterized by a butane working capacity from above 15 g/100 cm 3 to about 25 g/100 cm 3 and a density of from about 0.25 to about, 0.40 g/cm 3.
2. The method of claim 1 wherein the lignocellulosic material is selected from the group consisting of wood chips, wood flour, and sawdust.
3. The method of claim 1 wherein the weight ratio of chemical activating agent to lignocellulosic material is from about 3:1 to about 1:1, respectively.
4. The method of claim 3 wherein the ratio is about 1.6:1.
5. The method of claim 1 wherein the weight binder-to-char ratio is about 0.08:1.
6. The method of claim 1 wherein the product of step (d) is subjected to a heat treatment of from about 35° to about 120° C. prior to the activation of step (e).
7. The method of claim 1 wherein the activatable binder material is a lignosulfonate.
8. The method of claim 7 wherein the lignosulfonate is ammonium lignosulfonate.