Abstract: This invention relates to a method of efficiently producing a high-purity para-substituted aromatic hydrocarbon while suppressing caulking without requiring isomerization-adsorption separation steps, and more particularly to a method of producing a para-substituted aromatic hydrocarbon, characterized in that a methylating agent and an aromatic hydrocarbon are reacted in the presence of a catalyst formed by coating MFI type zeolite having a particle size of not more than 100 ?m with a crystalline silicate.

Abstract: This invention relates to a novel catalyst which enables an efficient production of a high-purity para-substituted aromatic hydrocarbon even without conducting isomerization step and/or adsorption separation step, and more particularly to a catalyst for producing a para-substituted aromatic hydrocarbon, which is formed by coating an MFI-type zeolite having an SiO2/Al2O3 ratio (molar ratio) of 20 to 5000 and a primary particle size of not more than 1 ?m with a crystalline silicate and is characterized by having a pKa value as measured by a Hammett indicator of not less than ?8.

Abstract: This invention relates to a method of efficiently producing a high-purity para-substituted aromatic hydrocarbon while suppressing caulking without requiring isomerization-adsorption separation steps, and more particularly to a method of producing a para-substituted aromatic hydrocarbon, characterized in that a methylating agent and an aromatic hydrocarbon are reacted in the presence of a catalyst formed by coating MFI type zeolite having a particle size of not more than 100 ?m with a crystalline silicate.

Abstract: A heavy oil hydrorefining catalyst of the present invention is such that the total volume of pores with a diameter of 60 nm or less is at least 0.5 mL/g, and the pore diameter distribution has a broad band over a pore diameter range of 8 to 30 nm. The hydrorefining catalyst has excellent desulfurization characteristics and excellent demetalization characteristics, and its performance can be maintained over an extended period. When this catalyst is used in a hydrorefining apparatus equipped with a plurality of catalyst layers, the apparatus can be operated stably at a higher temperature than in the past without decreasing the desulfurization performance, and this also enhances the demetalization characteristics.

Abstract: A heavy oil hydrorefining catalyst of the present invention is such that the total volume of pores with a diameter of 60 nm or less is at least 0.5 mL/g, and the pore diameter distribution has a broad band over a pore diameter range of 8 to 30 nm. The hydrorefining catalyst has excellent desulfurization characteristics and excellent demetalization characteristics, and its performance can be maintained over an extended period. When this catalyst is used in a hydrorefining apparatus equipped with a plurality of catalyst layers, the apparatus can be operated stably at a higher temperature than in the past without decreasing the desulfurization performance, and this also enhances the demetalization characteristics.