Process of producing beta-methylnaphthalene

Abstract

The present invention relates to coal chemical technology, and is especially process of producing beta-methylnaphthalene. The materials including industrial methylnaphthalene and azeotropic agent in the volume ratio of 1 to 0.4-0.6 are rectified through heating in an intermittent rectifying still, and the product is recovered in a rectifying tower with theoretical plate number of 50-80 to obtain fraction successively. The beta-methylnaphthalene fraction and the alpha-methylnaphthalene fraction are separated in separator to eliminate azeotropic agent and rectified to obtain beta-methylnaphthalene product and alpha-methylnaphthalene product with content over 95 %. The present invention has one increased oil-oil separator and the product has indole content lower than 0.5 %.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, and relates to a method for producing β-methylnaphthalene. Background technique [0002] At present, the industrial methylnaphthalene (the content of β-methylnaphthalene is about 50%) produced by our factory has an annual output of 2,700 tons, which can be used for the production of water reducing agents and diffusing agents, but not for the production of vitamin K 3 . At present, Baosteel and other enterprises in China produce β-methylnaphthalene. Since the price of β-methylnaphthalene is relatively high, about 15,000 yuan / ton, as a manufacturer with a large output of industrial methylnaphthalene, we should produce β-methylnaphthalene. Participate in market competition and create more benefits for enterprises. Since β-methylnaphthalene is azeotropic with indole (boiling point 254° C.) during rectification, no β-methylnaphthalene product with a conten...

AI Technical Summary

Problems solved by technology

In addition, new check point 2 "Using industrial methylnaphthalene (containing about 50% of β-methylnaphthalene) as raw material, azeotropic distillation with diethylene glycol to obtain β-methylnaphthalene fraction (containing about 80% of β-methylnaphthalene) ), obtain the α-methylnaphthalene fraction simultaneously, and the α-methylnaphthalene fraction obtains α-methylnaphthalene through rectification again " also does not have the same report in the document checked by this method

[0011] To sum up, the domestic literature search has not found the same literature report as this research