Abstract: A method for producing a coke includes performing dry distillation of a mixture. The mixture includes: an ashless coal; an oxidized ashless coal obtained by an oxidation treatment of an ashless coal; and a raw petroleum coke. Relative to 100 parts by mass of a total of the ashless coal, the oxidized ashless coal and the raw petroleum coke, a content of the ashless coal is from 5 to 40 parts by mass, and a total content of the ashless coal and the oxidized ashless coal is from 30 to 70 parts by mass.

Abstract: A raw material pitch for carbon fiber production, with which carbon fiber excellent in tensile strength can be produced at relatively low costs, is provided. The raw material pitch is obtained from coal, is a pitch for producing carbon fiber by melt spinning, and contains oxygen in a content of 1.0% by mass or more and a toluene-soluble component in a content of 20% by mass or more. The coal is preferably bituminous coal or sub-bituminous coal. The raw material pitch is preferably prepared by subjecting a solvent-soluble component separated from a thermal decomposition product of coal in a solvent by a solvent extraction treatment at a temperature of less than 300° C. to a heat treatment at a temperature of 150° C. or more.

Abstract: A production apparatus of an ashless coal includes a preheater, an extraction tank, a feed pipe, a solid-liquid separator and a solvent separator. The preheater heats a solvent. The extraction tank extracts a coal component soluble in the solvent from a slurry including a mixture of a coal and the solvent heated by the preheater. The coal feeding unit feeds the coal to the feed pipe by pressuring a feed part to the feed pipe such that the solvent does not flow back. The solid-liquid separator separates a solution part containing the coal component from the slurry. The solvent separator evaporates and separates the solvent from the solution part to obtain an ashless coal.

Abstract: A method for producing a carbon fiber includes a separation step of separating an ash-free coal obtained from a bituminous coal or a sub-bituminous coal, into a soluble component(s) and an insoluble component(s) by a solvent extraction treatment, a heat treatment step of heat-treating the soluble component(s), a melt spinning step of melt-spinning the soluble component(s) subjected to the heat treatment, an infusibilization step of infusibilizing a filament body obtained by the melt spinning, and a carbonization step of carbonizing the filament body subjected to the infusibilization.

Abstract: A method for producing a carbon material including an oxidation step of oxidizing an ashless coal, a forming step of mixing an oxidized ashless coal obtained in the oxidation step and an unoxidized ashless coal and forming a mixture thereof, and a carbonization step of carbonizing a formed body obtained in the formation step. Percentage of increase in oxygen of the oxidized ashless coal obtained in the oxidation step is from 2.0 to 10.0%. A mixing ratio of the oxidized ashless coal in the forming step is from 60 to 95 parts by mass per 100 parts by mass of a total of the oxidized ashless coal and the unoxidized ashless coal.

Abstract: A coal-blended material is obtained by mixing an ashless coal that is a solvent extract of a coal, and a steam coal, in a weight ratio of from 1:1 to 1:5 without heating. The mixed coal after the mixing has a Gieseler fluidity of 1.0 (Log ddpm) or more and an average maximum reflectance of 0.75 (%) or higher.

Abstract: This method for producing a carbon material includes: a step of mixing an ashless coal, which is obtained by subjecting coal to a solvent extraction treatment, with an ashless coal coke, which is obtained by carbonizing an ashless coal; a step of heating and molding the obtained mixture; and a step of carbonizing the obtained molded body. In addition, the obtained carbon material contains ashless coal and has an optically anisotropic structure in which the proportion of the structure that is a coarse-grained mosaic or finer is 90% or higher.

Abstract: A method for producing a coke includes performing dry distillation of a mixture. The mixture includes: an ashless coal; an oxidized ashless coal obtained by an oxidation treatment of an ashless coal; and a raw petroleum coke. Relative to 100 parts by mass of a total of the ashless coal, the oxidized ashless coal and the raw petroleum coke, a content of the ashless coal is from 5 to 40 parts by mass, and a total content of the ashless coal and the oxidized ashless coal is from 30 to 70 parts by mass.

Abstract: A method for producing a carbon material including an oxidation step of oxidizing an ashless coal, a forming step of mixing an oxidized ashless coal obtained in the oxidation step and an unoxidized ashless coal and forming a mixture thereof, and a carbonization step of carbonizing a formed body obtained in the formation step. Percentage of increase in oxygen of the oxidized ashless coal obtained in the oxidation step is from 2.0 to 10.0%. A mixing ratio of the oxidized ashless coal in the forming step is from 60 to 95 parts by mass per 100 parts by mass of a total of the oxidized ashless coal and the unoxidized ashless coal.

Abstract: Provided is an ash-free coal production method without the need to once re-liquefy and form an ash-free coal. The ash-free coal production method includes an extraction step of mixing coal with a solvent to prepare a slurry and heating the slurry to extract a solvent-soluble coal component; a separation step of separating a solution containing the solvent-soluble coal component from the slurry obtained from the extraction step; an ash-free coal obtaining step of evaporatively separating the solvent from the solution separated in the separation step to obtain an ash-free coal. The ash-free coal obtaining step in the production method is performed so that the solvent is evaporatively separated from the solution to give a liquid ash-free coal, and the liquid ash-free coal is brought into contact with a solidifier (e.g., water) to solidify into a predetermined shape.

Abstract: Provided is a method that controls and uniformizes fluidity of ash-free coal. The method includes the steps of obtaining an ash-free coal by removing a solvent from a solution containing a coal component dissolved therein (ash-free coal obtaining step (solvent recovering unit 8)); and mixing a plurality of coals of different types or components thereof, where the coals are capable of individually giving ash-free coals having different fluidities (mixing step (see reference signs B1 to B6)). The ash-free coal obtaining step (solvent recovering unit 8) obtains the ash-free coal by removing the solvent from the solution containing components of the coals which have been mixed.

Abstract: A gravitational settling tank including a pressure vessel which precipitates solid content contained in slurry in which coal and solvent are blended, and separates the solid-content concentrated liquid from the supernatant liquid, and a supply pipe which supplies the pressure vessel with the slurry. A main body part and a nozzle part which is connected on the downstream side of the main body part and extends horizontally are provided in the supply pipe. A plurality of holes are provided in the nozzle part. By virtue of this, agitation of the solid-content concentrated liquid which has settled in the bottom is inhibited.

Abstract: A production apparatus of an ashless coal includes a preheater, an extraction tank, a feed pipe, a solid-liquid separator and a solvent separator. The preheater heats a solvent. The extraction tank extracts a coal component soluble in the solvent from a slurry including a mixture of a coal and the solvent heated by the preheater. The coal feeding unit feeds the coal to the feed pipe by pressuring a feed part to the feed pipe such that the solvent does not flow back. The solid-liquid separator separates a solution part containing the coal component from the slurry. The solvent separator evaporates and separates the solvent from the solution part to obtain an ashless coal.

Abstract: Provided is an ash-free coal production method without the need to once re-liquefy and form an ash-free coal. The ash-free coal production method includes an extraction step of mixing coal with a solvent to prepare a slurry and heating the slurry to extract a solvent-soluble coal component; a separation step of separating a solution containing the solvent-soluble coal component from the slurry obtained from the extraction step; an ash-free coal obtaining step of evaporatively separating the solvent from the solution separated in the separation step to obtain an ash-free coal. The ash-free coal obtaining step in the production method is performed so that the solvent is evaporatively separated from the solution to give a liquid ash-free coal, and the liquid ash-free coal is brought into contact with a solidifier (e.g., water) to solidify into a predetermined shape.

Abstract: Provided is a meted that controls and uniformizes fluidity of ash-free coal. The method includes the steps of obtaining an ash-free coal by removing a solvent from a solution containing a coal component dissolved therein (ash-free coal obtaining step (solvent recovering unit 8)); and mixing a plurality of coals of different types or components theme where the coals are capable of individually giving ash-free coals having different fluidities (mixing step (see reference signs B1 to B6)). The ash-free coal obtaining step (solvent recovering unit 8) obtains the ash-free coal by removing the solvent from the solution containing components of the coals which have been mixed.

Abstract: A gravitational settling tank including a pressure vessel which precipitates solid content contained in slurry in which coal and solvent are blended, and separates the solid-content concentrated liquid from the supernatant liquid, and a supply pipe which supplies the pressure vessel with the slurry. A main body part and a nozzle part which is connected on the downstream side of the main body part and extends horizontally are provided in the supply pipe. A plurality of holes are provided in the nozzle part. By virtue of this, agitation of the solid-content concentrated liquid which has settled in the bottom is inhibited.

Abstract: Provided is a process for producing a glass-like carbon deformed molded article having a deformed section (typically, an elliptical section or a section composed of partial circles and linear portions), such as a glass-like carbon member in a deformed pipe form or a bent pipe, with relative ease and a good dimensional accuracy. The process comprises the step of molding a thermosetting resin to yield a thermosetting resin molded article, the step of deforming the thermosetting resin molded article plastically in the state that the article is heated, so as to yield a thermosetting resin deformed article, and the step of carbonizing the resultant thermosetting resin deformed article.

Abstract: A glass-like carbon induction heating element having high heating efficiency and a heating apparatus are provided. A glass-like carbon induction heating element, which inductively generates heat by electromagnetic induction, has an infrared radiation characteristic that a ratio (E1/E2) of infrared radiation intensity (E1) of an opposed face to an object-to-be-heated to infrared radiation intensity (E2) of a non-opposed face to the object-to-be-heated exceeds 1.2. A heating apparatus has the glass-like carbon induction heating element, and a high frequency induction coil that is disposed outside the glass-like carbon induction heating element for allowing the glass-like carbon induction heating element to inductively generate heat, wherein the high frequency induction coil is applied with a current so that the object-to-be-heated is heated by infrared rays radiated from the glass-like carbon induction heating element.

Abstract: Disclosed herein is an inner tube of glass-like carbon for CVD apparatus and a process for production thereof. The inner tube has its surface roughened without increase in metal impurities which cause particles. It has improved adhesion to CVD deposit film and also has a high degree of roundness. The surface roughness (on both the inner and outer surfaces) is 0.1-10 ?m measured according to JIS B0601. The concentration of metal impurities (iron, copper, chromium, sodium, potassium, calcium, magnesium, and aluminum) in the surface is less than 50×1010 atoms/cm2.

Abstract: A fluid heating apparatus is provided, which can efficiently heat a fluid to be heated without contaminating the fluid. The fluid heating apparatus has a heating room including a magnetic-flux permeable material, and having an inlet for introducing a fluid to be heated, and an outlet for exhausting a heat-treated fluid; a plurality of glassy carbon fillers filled in the heating room, each of which is partially or wholly formed in a shape of curved surface or protrusion; and an induction coil disposed outside the heating room for inductively heating the glassy carbon fillers.