Method and special equipment for production of high-purity beta-methylnaphthalene by wash oil

Abstract

The invention discloses a method and special equipment for production of high-purity beta-methylnaphthalene by wash oil. The method is characterized by including steps of firstly, preparing mixed methylnaphthalene by wash oil for one step, secondly, removing quinoline from the methylnaphthalene by means of acid washing, thirdly, removing naphthalene and light component from the mixed methylnaphthalene, fourthly, gathering and distilling, and fifthly, preparing high-purity beta-methylnaphthalene. The special equipment comprises methyl-removing inner tower, an acid washing kettle, a naphthalene-removing and light component removing tower, a separator, a distilling tower and a rectifying tower. Due to the step of preparing mixed methylnaphthalene by wash oil for one step, the step of preliminary naphthalene removing is omitted, a naphthalene removing tower and equipment matched with the same are omitted, and investment on equipment is partially saved. Since the procedures of acid washing of quinoline and indole are completed later, acid washing amount is reduced, wastewater generated in acid washing is reduced, and sewage discharging volume and cost for wastewater treatment are reduced. Besides, produced beta-methylnaphthalene is high in purity.

Description

Technical field [0001] The invention relates to a production method and equipment of β-methylnaphthalene, in particular to a method and special equipment for producing high-purity β-methylnaphthalene from washing oil. Background technique [0002] At present, the traditional process uses wash oil to produce β-methylnaphthalene, and the production steps are: (1) Use acid to remove quinoline and indole from the wash oil: before the wash oil is processed, the concentration is 30% and Acid wash with 60% sulfuric acid to remove the quinoline and indole in the wash oil to prevent the purity of β-methylnaphthalene produced from failing to meet the requirements; (2) to remove the naphthalene in the wash oil: use a naphthalene removal tower, The wash oil after pickling in step (1) is pumped into the naphthalene removal tower, the naphthalene removal tower is heated, and the top temperature of the tower is 160-190℃, and the naphthalene fraction is extracted to separate the naphthalene; (3)...

AI Technical Summary

Problems solved by technology

Although this method and equipment have improved the purity of β-methylnaphthalene, there are also following deficiencies: the one, because there is an operation of acid-eluting quinoline and indole before the washing oil enters the processing procedure, the tower equipment is relatively Many, make the equipment complex, difficult to operate, increase the investment and energy consumption and the labor intensity of workers; Second, because the pickling is washing oil, so the pickling amount is large, and there are many pickling waste liquids, which increases the pickling pipeline and Instruments and instruments have increased investment, and the waste liquid after pickling is seriously polluted, and the cost of environmental protection treatment is high; the third is that β-methylnaphthalene still contains 0.2-1% indole, so it affects β-methylnaphthalene. Production quality of naphthalene

This method of removing indole increases the acid-base waste liquid and increases the difficulty of sewage treatment

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