Abstract: To provide an activated carbon sheet molding that can reduce a leak amount of fuel vapor, realize small ventilation resistance, and is excellent in moldability and strength, and an element for a fuel evaporative emission preventing device for preventing evaporative emission of fuel vapor from a fuel tank system and an intake system by using the activated carbon sheet molding. The object can be achieved by an activated carbon sheet molding made of activated carbon that satisfies b/a=0.3 through 0.55 provided that a 100%-concentration n-butane adsorbing amount per 100 parts by weight of activated carbon at 40° C. is defined as a parts by weight, and a 1%-concentration n-butane adsorbing amount is defined as b parts by weight.

Abstract: A polarizing electrode for an electric double layer capacitor has good moldability and can achieving higher density of electrode and higher capacity, and an electric double layer capacitor employs the same. The electric double layer capacitor is made of an activated carbon obtained by activating a hard-to-graphitize material (for example, phenol resin) with water vapor, and the activated carbon has a median particle size within a range from 4 ?m to 8 ?m in the particle size distribution and at least a peak observed on the side of smaller particle size than the median particle size in the particle size distribution.

Abstract: The invention provides a filter element exhibiting an excellent deodorizing and adsorbing function with low pressure drop, as well as to a method for its manufacture and a filter using the element. The filter element is manufactured by coating a base fabric with an adhesive and allowing the fabric to move in an electrostatic field formed by a high voltage generating device to allow pulverized adsorbent powder with a specific mean particle size and standard deviation to electrostatically adhere to the base fabric surface. The filter element can also be manufactured by dispersing a pulverized adsorbent powder on the surface of a base fabric comprising heat-fusible fibers, and then partially fusing the heat-fusible fibers by heating to attach them to the adsorbent powder and allow the adsorbent powder to adhere to the base fabric surface.

Abstract: The invention provides a filter element exhibiting an excellent deodorizing and adsorbing function with low pressure drop, as well as to a method for its manufacture and a filter using the element, and this is achieved by a filter element which satisfies the relationship that 0?A?1.1 mB+C and m=0.28?0.0005 D50, with the proviso that 0<C?15, where D50 (?m) is the 50% particle diameter of the adsorbent powder, B (g/m2) is the amount of the adsorbent powder adhered to the base fabric, A (Pa) is the pressure drop of the filter as measured at room temperature under an air flow rate of 1 m/sec and C (Pa) is the pressure drop of the base fabric when coated with the adhesive and dried, as well as a method for its manufacture and a filter using the element.

Abstract: A polarizing electrode for an electric double layer capacitor has good moldability and is capable of achieving higher density of electrode and higher capacity. An electric double layer capacitor employs the same. The polarizing electrode for an electric double layer capacitor is made of an activated carbon obtained by activating a hard-to-graphitize material (for example, phenol resin) with water vapor, and the activated carbon has a median particle size within a range from 4 &mgr;m to 8 &mgr;m in the particle size distribution as measured by a laser diffraction method and a benzene adsorption ratio of not less than 47.0% and not more than 60% by weight of activated carbon.

Abstract: A canister for a vehicular evaporative emission control system has activated carbon and heating means. The heating means heats the activated carbon particles. The activated carbon particles are characterized by the following properties. Pore volume is 0.28 ml/ml or more. Average pore radius is in a range of 10.5 Angstroms to 12.0 Angstroms. Particle diameter of the activated carbon is in a range of 1.0 mm to 1.6 mm. The activated carbon particles provide high performances on both of adsorption and desorption.

Abstract: The present invention provides an activated carbon produced by a process, which includes: activating a carbonaceous material, to obtain an activated carbonaceous material; and contacting the activated carbonaceous material with an acid. Another embodiment of the present invention provides an electrode for an electric double-layer capacitor, which includes the above-described activated carbon. Another embodiment of the present invention provides a filter, which includes the above-described activated carbon. Another embodiment of the present invention provides a shaped article, which includes the above-described activated carbon. Another embodiment of the present invention provides a method for producing activated carbon, which includes activating a carbonaceous material, to obtain an activated carbonaceous material; and contacting the activated carbonaceous material with an acid, to obtain the activated carbon.

Abstract: A porous adsorbent with a urea compound having a urea linkage within the molecule thereof and an inorganic acid and/or an organic acid supported on a porous support is shown. The porous adsorbent is capable of efficiently eliminating lower aldehydes at ordinary temperature for a prolonged period of time.

Abstract: A primary object of the invention is to provide an adsorbent capable of efficiently eliminating lower aldehydes at ordinary temperature for a prolonged period of time and excellent in rate of elimination, heat resistance and safety.

Abstract: Preferably configured in ridge and recess irregularity, the inventive article provides adsorption of malodor components in air and also dust collecting function. It comprises woven sheet having coarse three dimensional structure whose areas of sheet surface as well as internal fiber structure allowable to contact to incoming outer air are formed with a binder layer made of latex or emulsion or non-solvent adhesive and such binder layer is adhered with activated carbon particles partially exposed. The process of adhereing activated carbon particles is conveniently performed by a fluidizing bed. The inventive sheet form fabric incorporates the particles with a high void ratio and uniformity and thereby exhibits high adsorptive rate and capacity, and exceedingly low pressure loss with such result that it is applicable regardless of high or air wind rate. Preferable use is a filter element of air-conditioner for cars.

Abstract: A metal oxide-carrying activated carbon having an oxidation catalytic activity comprises a treated activated carbon obtained by carbonizing a carbon material, activating the obtained carbon with an activating gas comprising carbon dioxide and water vapor, said activating gas containing not more than 15% by volume of water vapor, and then cooling the activated carbon down to a temperature of not more than 300.degree. C. under the same atmosphere; and, carried thereon, 0.1 to 20% by weight as converted into metal of an oxide of at least one metal selected from the group consisting of iron, chromium, nickel, cobalt, manganese, zinc, copper, magnesium and calcium. A deodorant is obtained by adding 1 to 50 parts by weight of a plastic powder having an average particle diameter of 1 to 50 .mu.m to 100 parts by weight of the above metal oxide-carrying activated carbon. The above.

Abstract: An activated carbon based adsorbent carrying an acid is provided for eliminating mercury or mercury compounds contained in hydrocarbons. Preferably the activated carbon base is provided with more than 80 ml/g micropore volume having radii less than 8 angstroms. Preferably the acid carried on the activated carbon is hydrochloric acid, sulfuric acid, or phosphoric acid. Hydrochloric acid is most preferred. The active carbon base is preferably manufactured by activating a carbonaceous material in an atmosphere comprising less than 30 vol. % water vapor. The adsorbent can be used to eliminate mercury or mercury compounds contained in hydrocarbons by contacting the adsorbent with the hydrocarbons in liquid phase. Particular hydrocarbons include naphtha and intermediates of oil products or petrochemical products. Minimal amounts of carried acid are desorbed from the adsorbent to the hydrocarbons.

Abstract: Activated carbon is prepared specially by activating carbonaceous material in a circumstance comprising water vapor less than 15% on volume basis and providing thus treated activated carbon carries alkaline or alkaline earth metal sulfide in it. Thus prepared activated carbon or that carrying these compound provides for method of eliminating mercury and its compounds from liquid hydrocarbons substantially completely contained at a slight amount in it. Liquid hydrocarbons containing mercury or sulfur will harm catalysts which are often applied during process for such intermediates of petroleum products and petrochemical products. Thus the present method is advantageous to processing of such oil intermediates.

Abstract: A freshness keeping sheet comprises:100 parts by weight of a palladium chloride-carrying activated carbon obtained by activating a carbon material under an atmosphere containing not more than 15% by volume of water vapor and cooling the activated carbon material to not more than 300.degree. C. under the same atmosphere and then permitting the resulting activated carbon to carry 0.1 to 10% by weight of palladium chloride, and 1 to 20 parts by weight of a synthetic fiber having a single fiber diameter of 1 to 30 .mu.m as a binder, said palladium chloride-carrying activated carbon and said synthetic fiber having been mixed and integrally molded into a sheet.The sheet can rapidly remove thin ethylene from a gas even at low temperatures and is hence excellent as a freshness keeping sheet for refrigerators and vegetables and fruits storing boxes.

Abstract: A process for separating nitrogen which comprises, with a nitrogen gas separation apparatus of a pressure-swing adsorption type, a gas transfer step between an adsorber having completed an adsorption step with another adsorber having completed a regeneration step. The gas transfer step further comprising discharging part of the gas being transferred out of the system. This process provides, with compact equipment, high-purity product nitrogen with a purity of at least 99.99%, which has been considered difficult to obtain with conventional pressure-swing adsorption apparatuses.

Abstract: Provided are molded adsorbents comprising a mixture of adsorbent particles, fine plastic particles and a reinforcing fiber, the mixture having been molded utilizing the fine plastic particles and, as required, the reinforcing fiber as binder. They have features, as compared with conventional molded adsorbents utilizing a latex binder, having an adsorptive capacity having been decreased to a smaller extent from those of the raw material adsorbent particles used and higher adsorption rate owing to well-maintained porosity. They have good mechanical properties at normal temperature and can hence be processed by cutting or like machinings into various machine parts, including blades of fans having both adsorptive capacity and high mechanical properties. Also provided are a process for producing the above molded adsorbents and their use as deodorizing units.

Abstract: Provided are carbon molecular sieves produced by treating carbonacious materials with plasma. One of their most important uses is adsorbent for pressure swing adsorption processes, which are widely used for the separation of gases on industrial scales. The carbon molecular sieves meet the strong demand in this field where the performance of the adsorbent used governs the efficiency of gas separation.The carbon molecular sieves of the present invention are particularly effective in separating nitrogen gas from air.

Abstract: A process for separating nitrogen gas higher in purity than conventional products from a gas mixture predominantly composed of nitrogen gas and oxygen gas by the pressure swing adsorption system using carbon molecular sieve as adsorbent is characterized by the manner of communicating an adsorber after adsorption step with an adsorber after regeneration step for gas transfer from the former adsorber to the latter, the operation of discontinuing the gas transfer before establishment of pressure equalization, and the regeneration promotion by causing back flow of part of product gas.The process can separate 99.99% pure nitrogen gas, which is never obtainable in the prior pressure swing adsorption processes, from air as raw material in an economic manner.

Abstract: A process for manufacturing a carbon molecular sieve having both increased gas adsorption capacity and selectivity, which entails:(a) adding coal tar, coal tar pitch, or a combination thereof to powdered coconut shell charcoal as a binder;(b) pelletizing the mixture and carbonizing the same at about 600.degree.-900.degree.;(c) immersing the pellets in mineral acid solution, thereby sustantially removing soluble ingredients containing alkaline metal compounds therefrom;(d) drying the immersed pellets;(e) adding to the dried pellets a fraction of cresote which is distilled at a temperature of 140.degree. to 260.degree. C., in an amount sufficient to increase both said gas adsorption capacity and selectivity;(f) heating the pellets to about 600.degree.-900.degree. C., for about 10-60 minutes; and(g) cooling the pellets in an inert gas.

Abstract: A process for manufacturing molecular sieving carbon is disclosed, wherein pelletized charcoal made of coconut shell charcoal powder and coal tar is washed with dilute mineral acid solution, then a specified amount of coal tar is added, penetrated therein, followed by heat treatment under a particular range of temperature, and cooling in inert gas.