A kind of method of producing β-methylnaphthalene by continuous distillation of coal tar washing oil

Abstract

The invention relates to a method for producing beta-methylnaphthalene by using coal tar washing oil for continuously distilling, the method employs three towers continuous distillation, an industrial beta-methylnaphthalene product containing greater than or equal to 95% of beta-methylnaphthalene and less than or equal to 0.2% of indole can be cut at tower top or side line after the rectification treatment is carried out at a rectifying tower finally, an alpha-methylnaphthalene ingredient or industrial alpha-methylnaphthalene can be cut at the bottom of the tower; and an azeotropic solvent and methylnaphthalene can be reused after being separated. The yield of beta-methylnaphthalene is greater than or equal to 90%, the alpha-methylnaphthalene with yield greater than or equal to 90% can be collected; an azeotropic distillation tower and an intermediate rectifying tower can employ a mode of a single tower or multiple towers connected in series. Compared with the prior art, the method for producing beta-methylnaphthalene by using coal tar washing oil for continuously distilling has the advantages of simple production technology, high yield of industrial beta-methylnaphthalene, low power consumption, high labor productivity and good environmental protection effect. The continuous rectification technology has high automation level, and is easy to being controlled and adjusted, and is more suitable for processing the large-scale coal tar washing oil.

Description

technical field [0001] The invention relates to the technical field of coal tar processing, in particular to a method for producing industrial β-methylnaphthalene from coal tar washing oil. Background technique [0002] The typical process of producing industrial β-methylnaphthalene with coal tar washing oil is shown in the attached figure 1 Shown: take the industrial methylnaphthalene fraction of coal tar washing oil as raw material 101 after removing the fractions before and after methylnaphthalene, add 1: (0.4-0.6) entraining agent (ethylene glycol, diethylene glycol, or diethylene glycol) Diol) 102, through intermittent still 103 and distillation tower 104 distillation, extract β-methylnaphthalene (≥70%) and entrainer 105 successively, α-methylnaphthalene (≥70%) and entrainer 106, above-mentioned Cut β-methylnaphthalene fraction (≥70%) fraction 108 after separator 107-1 separation, α-methylnaphthalene fraction (≥70%) 109 after separator 107-2 separation is through batch...

AI Technical Summary

Problems solved by technology

The process deals with β-methylnaphthalene and α-methylnaphthalene respectively, which has complex process, low labor productivity, high energy consumption, small processing capacity, low degree of automation, low yield of industrial β-methylnaphthalene, poor economic benefits, etc. ills

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