Method for extracting phenolic compounds from coal tar by utilizing ethanolamine

A technology for phenolic compounds and ethanolamines, which can be used in the preparation of organic compounds, chemical instruments and methods, and tar processing through selective solvent extraction, and can solve problems such as unsuitable development of phenolic extraction and environmental pollution.

Inactive Publication Date: 2018-09-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has a higher extraction rate, it usually produces a large amount of phenol-containing alkali residue, which causes great pollution to the environment
[0004] With the rapid development of new coal chemical industry and increasingly stringent environmental protection requirements, the relatively mature alkaline washing method for phenol extraction has become less and less suitable for the development of the industry

Method used

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  • Method for extracting phenolic compounds from coal tar by utilizing ethanolamine
  • Method for extracting phenolic compounds from coal tar by utilizing ethanolamine
  • Method for extracting phenolic compounds from coal tar by utilizing ethanolamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 extracts phenolic compounds from low temperature coal tar

[0024] The raw materials are taken from Hebei Longcheng Coal Comprehensive Utilization Co., Ltd.

[0025] The coal tar in the 170-230°C fraction was tested for phenol content (double-ball measurement method), and the results are shown in Table 1:

[0026] Table 1: Results of phenol content in coal tar

[0027]

[0028] In the laboratory, add 20g of extractant (ethanolamine) into the separatory funnel, then add 10g of phenol oil, react at 50°C for 30 minutes, stand to separate layers, take out the obtained lower layer, and pass the upper layer through Multi-stage extraction, the extract and the lower layer are mixed together as a mixture of phenol oil and extractant, placed in a three-necked flask, and then ethanolamine is evaporated by distillation to obtain 19g of ethanolamine, and then the lower layer of phenol oil is passed through GC- MS analysis, qualitative and quantitative analysis of t...

Embodiment 2

[0033] Embodiment 2 extracts phenolic compounds from low temperature coal tar

[0034] The raw materials are taken from Hebei Longcheng Coal Comprehensive Utilization Co., Ltd.

[0035] The coal tar in the 170-230°C fraction was tested for phenol content (double-ball measurement method), and the results are shown in Table 1:

[0036] Table 1: Results of phenol content in coal tar

[0037]

[0038] In the laboratory, add 30 g of extractant (ethanolamine) to the separatory funnel, then add

[0039] 10g of phenol oil was reacted at 60°C for 40min, allowed to stand and separated, and the obtained lower layer liquid was taken out, and the upper layer liquid was subjected to multi-stage extraction, and the extract and the lower layer liquid were mixed together as a mixture of phenol oil and extractant. Placed in a three-necked flask, and then distilled out ethanolamine by distillation to obtain 29g of ethanolamine, then the lower layer of phenol oil was analyzed by GC / MS, and t...

Embodiment 3

[0043] Embodiment 3 extracts phenolic compounds from low temperature coal tar

[0044] The raw materials are taken from Hebei Longcheng Coal Comprehensive Utilization Co., Ltd.

[0045] The coal tar in the 170-230°C fraction was tested for phenol content (double-ball measurement method), and the results are shown in Table 1:

[0046] Table 1: Results of phenol content in coal tar

[0047]

[0048] In the laboratory, add 50 g of extractant (ethanolamine) to the separatory funnel, then add

[0049] 10g of phenol oil was reacted at 65°C for 60min, allowed to stand for stratification, and the obtained lower layer liquid was taken out, and the upper layer liquid was subjected to multi-stage extraction, and the extract and the lower layer liquid were mixed together as a mixture of phenol oil and extractant. Placed in a three-necked flask, and then distilled out ethanolamine by distillation to obtain 49g of ethanolamine, then the phenol oil in the lower layer was analyzed by GC / ...

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Abstract

The invention relates to a method for extracting phenolic compounds from coal tar by utilizing ethanolamine. The specific steps are as follows: (1) distilling coal tar or coal liquefied oil, and cutting a fraction at 170 to 230 DEG C; (2) mixing an extracting agent with the phenolic oil fraction, and performing layering; (3) separating and collecting a phenolic oil lower layer containing the phenolic compounds; (4) subjecting a phenolic oil upper layer to a multi-stage extraction, and mixing the extracted phenol oil layer with the phenol oil lower layer; (5) separating the extracting agent-phenol solution by rectification, recycling the extracting agent for cyclic utilization, and separating to obtain crude phenol. Compared with the prior art (an alkaline washing method), the method for extracting phenolic compounds from coal tar, provided by the invention, avoids the use of acid-bases, and is beneficial to environmental protection, and the extracting agent can be recycled, thereby saving raw materials; and most importantly, the method can achieve the same extraction rate and purity as those of the alkaline washing method.

Description

technical field [0001] The invention belongs to the technical field of coal chemical wastewater and resource utilization, and relates to a method for extracting phenolic compounds from coal tar Background technique [0002] Coal chemical industry wastewater, coal liquefied oil and coal tar contain more phenolic compounds. Phenolic compounds are aromatic organic compounds whose main feature is a pungent smell. They are important raw materials in the chemical industry and are used for the production of bismuth Phenol A, phenolic resin, engineering plastics and synthetic fibers, in addition, phenolic compounds can increase the hydrogen consumption for the production of fuel oil in coal tar hydrogenation, therefore, the separation of phenolic compounds from coal tar can not only broaden the scope of coal tar and coal The comprehensive utilization of chemical wastewater can also reduce the hydrogen consumption in the subsequent hydrogenation process, improve economic efficiency, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/72C07C39/04C07C39/06C07C39/07C10C1/18
CPCC10C1/18C07C37/007C07C37/72C07C39/04C07C39/06C07C39/07
Inventor 宋红兵乔林盖恒军张晓伟肖盟
Owner QINGDAO UNIV OF SCI & TECH
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