摘要:
Activated carbons derived from low-density lignocellulosic agricultural waste, and for use in absorption of metals, are prepared utilizing carbon dioxide or steam activation at 800° C. to 950° C. for 3 to 12 hours and subsequent oxidation with air at 260° C. to 400° C. for 3 to 6 hours. Granular carbons are formed by the inclusion of a preliminary two-step process involving the admixture of a binder selected from molasses, coal tar or wood tar to form pellets, briquettes or extrudates and converting them into a char under an inert atmosphere at 700° C. to 750° C. for 1 to 2 hours.
摘要:
Purified carbon black carried by a screw conveyer, while being subject to preheating treatment, is transported to a microwave heating zone where it is heated to a temperature between 250° C. and 400° C. and subsequently, it is sent into a flow-type steam activation furnace there under the passage of steam and at a temperature inside the furnace maintained at 700° C. to 900° C. the carbon black is heated and activated to form a powdery activated carbon. This novel method for the production of activated carbon with high added value from carbon black is a continuous process of high productivity especially suitable for carbon black recovered from the heating and splitting decomposition processes of waste tires, waste plastics and the like. It is also suitable for carbon black as an industrial solid waste discharged from combustion electric power plant or from any industrial furnace that makes use of heavy oil, coal or natural gas for fuel; therefore the invention is a success not only with regard to recovery of resources but also regarding to environmental issues such as waste disposal and pollution.
摘要:
A halogen treatment is conducted comprising: a halogenation step wherein a halogenation heat treatment for preparing a halogenated carbonized charcoal is conducted in which the carbonized charcoal is brought into contact with halogen; and a dehalogenation step wherein a dehalogenation treatment is conducted in which a part of or all halogen atoms in the halogenated carbonized charcoal are eliminated. A porous carbonaceous material is obtained at a high yield, and the amounts of nitrogen, oxygen, carbon dioxide, and methane adsorbed by this porous carbonaceous material are large. When this porous carbonaceous material is used as an electrical double layer capacitor carbon, the electrostatic capacity is increased compared to conventional carbonaceous materials. Consequently, a carbonaceous material is obtained which has micopores and/or sub-micropores which are suitable for the adsorption of small molecules such as nitrogen, and for storage of electrochemical energy.
摘要:
The invention relates to the production of shaped high-performance adsorbents by steam activation in a rotary tunnel kiln operating in batches, in which spherically pre-formed materials are carefully pre-dried in a rotary tunnel dryer with 4-fold product turnover per kiln rotation and with a space/time ratio of from 1 to 2.5 m3/h using hot gas, then carbonised in an indirectly heated rotary tunnel kiln with 6-fold product turnover per kiln rotation and with a space/time ratio of from 5 to 10 m3/h in an inert-gas flow, and the carbonised semi-finished articles are activated in batches in an indirectly heated rotary tunnel kiln with 8-fold product turnover per kiln rotation and with a space/time ratio of from 1 to 5 m3/h with the addition of steam in an inert-gas flow. High-quality shaped high-performance adsorbents are obtained which are versatile and especially suitable for use in air separation, adsorptive cooling and as adsorbent components in textiles and synthetic fabrics.