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Method of extracting high purity acenaphthene from coat tar scrubbing oil

A coal tar, high-purity technology, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of high acenaphthene content, long process, environmental pollution, etc., achieve high recovery rate, simple preparation process, and convenient operation Effect

Inactive Publication Date: 2005-08-10
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process method is that the process is long, and it needs to use anionic, cationic, amphoteric, nonionic surfactants and special emulsification equipment. The production process produces a large amount of waste water. If it is not treated, it will inevitably cause environmental pollution. In addition, for The acenaphthene content of the raw material acenaphthene fraction is relatively high (over 79%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The vacuum rectification device is a rectification tower φ30×1600mm, stainless steel triangular packing, 53 trays, and a 500ml three-necked flask for the distillation kettle. Add 400g of coal tar washing oil (acenaphthene content 10.32%) into the three-necked flask, and vacuumize When the pressure is 0.053MPa, start heating to reflux. After 1-2 hours of stabilization, start to extract the distillate. The reflux ratio is 15. When the distillate temperature reaches 235°C, start to collect the acenaphthene fraction. When the temperature reaches 245°C, stop extracting 52.0 g of yellow acenaphthene crystals were obtained, the acenaphthene content was 68.75%, and the acenaphthene yield was 86.60% (based on the acenaphthene in the raw material washing oil).

[0010] Take 10 g of the crystalline acenaphthene fraction, add it to 15 ml of absolute ethanol, heat until the crystals dissolve, then slowly cool to 30° C., the crystals precipitate, filter, wash the crystals with 5 ml of...

Embodiment 2

[0012] With other conditions unchanged, 10ml of ethyl acetate was taken, and after recrystallization, the crystals were washed with 5ml of ethyl acetate and dried to obtain 5.8g of acenaphthene product with acenaphthene content of 99.03%, and the acenaphthene yield was 83.55%.

[0013] It can be seen from the above examples that the advantages of using this method to extract acenaphthene are low energy consumption, simple process, high recovery rate of acenaphthene fraction, high product content, no environmental pollution, and reduced production costs.

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PUM

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Abstract

A process for extracting high-purity acenaphthene from the washing oil of tar includes such steps as single-tower vacuum rectifying to obtain acenaphthene fraction at 235-245 deg.C mixing it with organic solvent, and recrystallizing. Its purity is more than 99%.

Description

technical field [0001] The invention relates to a method for extracting high-purity acenaphthene from coal tar washing oil in the field of coal deep processing. Background technique [0002] Acenaphthene is one of the main components in coal tar, accounting for about 1.2% to 1.8% in coal tar, and the third content in washing oil, reaching 10.32%. It is a variety worthy of vigorous development. Acenaphthene is the earliest product to be separated and utilized in coal tar washing oil, and there are many processed products, which are mainly used in the synthesis of dyes, especially high-grade organic dyes, bakelite powder, coatings, synthetic resins, engineering plastics, rubber antioxidants, etc. . [0003] At present, the known methods for extracting industrial acenaphthene from washing oil at home and abroad include aromatic hydrocarbon solvent crystallization method and high-pressure crystallization method, but their disadvantages are low content of acenaphthene product ob...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C13/547
Inventor 王军刘文彬
Owner HARBIN ENG UNIV
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