Abstract: The present invention provides a method for hydrocracking of petroleum heavy oil containing a heavy metal component, comprising a supplying step of supplying a raw material slurry containing the petroleum heavy oil and an iron-based catalyst as well as a hydrogen gas to a hydrocracking reactor; a hydrocracking step of hydrocracking the petroleum heavy oil in the hydrocracking reactor; a recovering step of recovering a residual oil component containing the iron-based catalyst from a product after the hydrocracking step; a disintegrating step of disintegrating the iron-based catalyst of the recovered residual oil component to acquire a disintegrated iron-based catalyst; and a resupplying step of resupplying a processed residual oil component containing the disintegrated iron-based catalyst to the hydrocracking reactor. At the disintegrating step, the iron-based catalyst may be pulverized by a pulverizing machine. The iron-based catalyst may be limonite.

Abstract: A method for storing upgraded coal, which is economical and whereby it becomes possible to prevent the spontaneous ignition of piles; and grain-size-controlled coal which rarely undergoes spontaneous ignition during storage. The method for storing upgraded coal includes piling up granular coal containing upgraded coal, wherein the content of grains each having a grain size of 10 mm or less in the coal is 50 mass % or more. It is preferred that the content of grains each having a grain size of 1 mm or less is 25 mass % or more and the content of grains each having a grain size of 0.15 mm or less is 7 mass % or more in the coal.

Abstract: The present invention provides a method for hydrocracking of petroleum heavy oil containing a heavy metal component, comprising a supplying step of supplying a raw material slurry containing the petroleum heavy oil and an iron-based catalyst as well as a hydrogen gas to a hydrocracking reactor; a hydrocracking step of hydrocracking the petroleum heavy oil in the hydrocracking reactor; a recovering step of recovering a residual oil component containing the iron-based catalyst from a product after the hydrocracking step; a disintegrating step of disintegrating the iron-based catalyst of the recovered residual oil component to acquire a disintegrated iron-based catalyst; and a resupplying step of resupplying a processed residual oil component containing the disintegrated iron-based catalyst to the hydrocracking reactor. At the disintegrating step, the iron-based catalyst may be pulverized by a pulverizing machine. The iron-based catalyst may be limonite.

Abstract: A method for storing upgraded coal, which is economical and whereby it becomes possible to prevent the spontaneous ignition of piles; and grain-size-controlled coal which rarely undergoes spontaneous ignition during storage. The method for storing upgraded coal includes piling up granular coal containing upgraded coal, wherein the content of grains each having a grain size of 10 mm or less in the coal is 50 mass % or more. It is preferred that the content of grains each having a grain size of 1 mm or less is 25 mass % or more and the content of grains each having a grain size of 0.15 mm or less is 7 mass % or more in the coal.