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

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...

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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 phenolic compounds is considered, and the separation of phenolic compounds is not considered. Nitrogen compounds, and there is no useful report to point out how to separate nitrogen-containing compounds in coal tar

The existence of nitrogen-containing compounds in coal tar has the following hazards: 1. Hydrogenation of nitrogen-containing compounds will generate ammonia, which will increase hydrogen consumption; 2. The ammonia generated by hydrogenation of nitrogen-containing compounds will easily poison the hydrogenation catalyst; 3. Not involved in hydrogenation The nitrogen-containing compounds reacted by hydrogen will affect the quality of oil products. Therefore, when separating coal tar, it is hoped that both the removal of phenols and the removal of nitrogen-containing compounds can be achieved while overcoming the influence of other complex components in coal tar. to solve the above technical problems

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