Process of producing beta-methylnaphthalene

A kind of technology of methyl naphthalene and methyl naphthalene fraction, applied in the field of coal chemical industry, can solve the problems such as literature reports that the same research is not found

Inactive Publication Date: 2007-06-06
ANGANG STEEL CO LTD
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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 f

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Embodiment Construction

[0021] A method for producing β-methylnaphthalene, the raw material industrial methylnaphthalene and entrainer (ethylene glycol, diethylene glycol or diethylene glycol) are loaded into a batch rectification kettle in volume ratio (1:0.4~0.6) Among them, after heating, it is extracted through a rectification tower. The theoretical plate number of the rectification tower is 50-80. The temperature of the rectification still is 240°C-300°C. 200°C to 250°C; extract cuts according to the composition of the gas chromatogram, successively extract β-methylnaphthalene fraction (the content of β-methylnaphthalene is greater than 70%), α-methylnaphthalene fraction (the content of α-methylnaphthalene is greater than 70%), the above-mentioned fractions enter the oil-oil separator successively to separate the entrainer (the entrainer is recycled), and then the β-methylnaphthalene fraction and the α-methylnaphthalene fraction that remove the entrainer are rectified respectively , obtain β-met...

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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...

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Application Information

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IPC IPC(8): C07C7/06C07C15/20
Inventor 李健马希博赵明姚君杨柏森吴磊张显强王萍
Owner ANGANG STEEL CO LTD
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