Abstract: A method for treating plastics, which is feasible on plastics containing films mixed therein, which is capable of performing dehydrochlorination simultaneously, and which provides processed plastics capable of being easily size-reduced. The method includes mixing the plastics with an organic solvent at a temperature not lower than 150.degree. C.; allowing the plastics to dissolve and/or swell; removing the organic solvent or both the organic solvent and low-boiling point components from the treated solution thereafter; and solidifying the resulting product. The method can produce solid fuels and reducing agents for ores.

Abstract: A method for refining a methylnaphthalene-containing oil includes the steps of azeotropically distilling the methylnaphthalene-containing oil with ethylene glycol to produce a methylnaphthalene fraction having a reduced content of nitrogen compounds; and hydrodesulfurizing the methylnaphthalene fraction in the presence of a catalyst having loaded thereto at least one member selected from molybdenum, cobalt and nickel.

Abstract: The invention provides a process for producing 2-methylnaphthalene by isomerization of 1-methylnaphthalene in which a Y zeolite having a unit cell constant of less than or equal to 24.37 .ANG. (10.sup.-10 m) is used as an isomerization catalyst.Since the isomerization is effected by the use of the inventive heterogeneous solid catalyst which has a long catalyst life, 2-methylnaphthalene is produced from 1-methylnaphthalene efficiently with less cost and handling steps for regeneration or exchange of the catalyst.

Abstract: An economically advantageous process for preparing 2-methylnaphthalene is provided. The process comprises the steps of azeotropically distilling a 1-methylnaphthalene-containing oil with ethylene glycol to produce a denitrified oil; subjecting the denitrified oil to an isomerization to promote an isomerization from 1-methylnaphthalene to 2-methylnaphthalene and produce an isomerization product; and recovering 2-methylnaphthalene from the isomerization product. The process may further comprise the step of hydrodesulfurizing or hydrogenating a portion or all of the denitrified oil to produce a hydrodesulfurized or hydrogenated product so that the product alone or the product together with the non-hydrodesulfurized or hydrogenated oil can be subjected to the subsequent isomerization step. Catalytic life of the isomerization catalyst is markedly prolonged to enable a production of 2-methylnaphthalene at a high yield.

Abstract: A catalyst in the form of a honeycomb structured cordierite carrier having platinum supported in a loading weight of at least 0.20 mg per square centimeter of the apparent outer surface area of the catalyst is effective in a process for oxidizing CO in exhaust gas from a sintering furance wherein it maintains high CO oxidiation efficiency for a longer period of time, requiring less frequently regeneration and less power consumption.