Separation method for phenol compounds and nitrogen-containing compounds in coal tar

A technology of phenolic compounds and nitrogen compounds, which is applied in tar processing by heat treatment, tar processing by chemical extraction, and tar processing by selective solvent extraction, etc., can solve the problem of consuming large acid-base solutions, polluting the environment, increasing hydrogen Consumption and other issues, to achieve the effect of low equipment investment and operating costs, simple process flow, and lower production costs

Active Publication Date: 2014-07-23
WUHUAN ENG
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  • Application Information

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Problems solved by technology

Although the sodium hydroxide solution elution method has high selectivity, it needs to consume a large amount of acid-base solution and has high requirements for equipment anti-corrosion.
More importantly, after pickling, a large amount of phenol-containing wastewater is produced, which leads to serious pollution of the subsequent sewage treatment equipment and environmental pollution.
[0004] So far, the research of the researchers has mainly focused on how to use a separating agent to extract the phenols in the simulated oil in a laboratory stage without pollution. However, for coal tar, its composition is extremely complex, not only containing phenolic compounds, but also Contains nitrogen-containing compounds that affect the subsequent hydrogenation process. In the reports so far, no matter whether the traditional alkali washing method or the separation agent separation method is used, only the separation of

Method used

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  • Separation method for phenol compounds and nitrogen-containing compounds in coal tar
  • Separation method for phenol compounds and nitrogen-containing compounds in coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The process conditions described in this example are: at 10°C, add complexing and separating agent A to coal tar (coal tar comes from Wuhan Iron and Steel Coking Plant, distillation range: 170-230°C), the mass ratio of the two is 1:10, After stirring for 50 minutes, it was left to stand for 8 minutes to measure the phenolic content and nitrogen content of the separated coal tar. The separation efficiency of phenolic compounds was 81.2%, and the separation efficiency of nitrogenous compounds was 71.1%. The obtained complex was heated at 200°C for 1 hour to selectively separate nitrogen-containing compounds. According to elemental analysis, the separation efficiency of nitrogen-containing compounds was 82.7%.

[0029] Add 300g of organic solvent B to the complex after the nitrogen-containing compound is separated, stir at 40°C for 20 minutes, then let it stand for 10 minutes, and recover the complexing and separating agent A through a bag filter. After the above process w...

Embodiment 2

[0032] The process conditions described in this example are: at 60°C, add complexing and separating agent A to coal tar (coal tar comes from Wuhan Iron and Steel Coking Plant, distillation range: 170-230°C), the mass ratio of the two is 1:10, After stirring for 20 minutes, let it stand for 8 minutes to measure the phenolic content and nitrogen content of the separated coal tar. The separation efficiency of phenolic compounds was 79.7%, and the separation efficiency of nitrogenous compounds was 70.4%. The obtained complex was heated at 140°C for 0.2h to selectively separate nitrogen-containing compounds. According to elemental analysis, the separation efficiency of nitrogen-containing compounds was 81.4%.

[0033] Add 300g of organic solvent B to the complex after the nitrogen-containing compound is separated, stir at 60°C for 1 min, then let it stand for 10 min, and recover the complexing and separating agent A through a bag filter. After the above process was repeated for 5 c...

Embodiment 3

[0035] The process conditions described in this example are: at 40°C, add complexing and separating agent A to coal tar (coal tar comes from Wuhan Iron and Steel Coking Plant, distillation range: 170-230°C), the mass ratio of the two is 0.8:10, Stir for 8 minutes and then stand for 8 minutes to measure the phenolic content and nitrogen content of the separated coal tar. The separation efficiency of phenolic compounds is 68.6%, and the separation efficiency of nitrogenous compounds is 64.4%. The obtained complex was heated at 110°C for 1 hour to selectively separate nitrogen-containing compounds. According to elemental analysis, the separation efficiency of nitrogen-containing compounds was 57.4%.

[0036] Add 300g of organic solvent B to the complex after the nitrogen-containing compound is separated, stir at 10°C for 30 minutes, then let it stand for 10 minutes, and recover the complexing and separating agent A through a bag filter. After the above process was repeated for 5 ...

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Abstract

The present invention discloses a separation method for phenol compounds and nitrogen-containing compounds in coal tar, wherein the problem that the coal tar is generally subjected to phenol compound separation is solved. The technical scheme comprises: adding a complexation separation agent to coal tar to carry out a complexation reaction, and then adopting an evaporation and back extraction manner to rapidly separate the nitrogen-containing compounds, the phenol compounds, the renewable separation agent and the solvent. The separation method has characteristics of simple process, environmental protection, no phenol-containing wastewater production, achievement of rapid and synchronous removal of phenol compounds and nitrogen-containing compounds, and good removal effect.

Description

technical field [0001] The invention relates to the separation field of coal chemical industry and petrochemical industry, in particular to a method for separating phenols and nitrogen-containing compounds in coal tar. Background technique [0002] The phenolic compounds and nitrogen-containing compounds in coal tar contain high-energy C-O and C-N bonds, which are difficult to hydrogenate, and the hydrogenation of phenols will generate water. Their existence in coal tar is not conducive to the hydrogenation of coal tar. quality. [0003] At present, the industry usually uses sodium hydroxide solution to separate the phenolic compounds in coal tar. The phenolic compounds are weakly acidic and react with a strong base to form a water-soluble phenolic sodium salt solution. The phenolic sodium salt uses carbon dioxide Or acidify with sulfuric acid solution to reduce phenols. Although the sodium hydroxide solution elution method has high selectivity, it needs to consume a large...

Claims

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Application Information

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IPC IPC(8): C10C1/20C10C1/19C10C1/18
Inventor 庞昆李繁荣朱阳明夏吴徐建民陈风敬卢文新
Owner WUHUAN ENG
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