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Method for extraction of pyridine compounds from coal tar

A technology of phenolic compounds and pyridines, which is applied in the field of coal chemical industry, can solve problems such as affecting oil quality, increasing hydrogen consumption, poisoning of hydrogenation catalysts, etc., so as to make up for the gap of rare resources and improve the utilization level.

Active Publication Date: 2015-09-09
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, the existence of pyridine compounds in coal tar has many hazards: hydrogenation of pyridine compounds will generate ammonia, which increases hydrogen consumption on the one hand, and on the other hand, the generated ammonia is likely to poison the hydrogenation catalyst; Pyridine compounds will affect the quality of oil

Method used

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  • Method for extraction of pyridine compounds from coal tar

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Embodiment

[0045] Below in conjunction with accompanying drawing, the technical method of the present invention is specifically described by example, so that understand the present invention better. All percentages mentioned herein are by mass unless otherwise stated.

example 1

[0047] A medium-temperature coal tar in northern Shaanxi, with a density of 1.042g / cm at 20°C 3 , the initial boiling point is 165°C, the final boiling point is 612°C, the sulfur content is 0.16%, and the nitrogen content is 1.2%.

[0048] The coal tar 1 is fractionated 2 by a coal tar fractionation tower to obtain a narrow distillate 3 at 165-300°C. Firstly, the narrow distillate oil is washed with 20% sodium hydroxide solution for dephenolization 4, the phenolic compounds in the distillate oil are changed into phenolic sodium salt, and then the phenolic sodium salt and dephenolic oil 9 are separated by using the density difference , sodium phenolate is decomposed by carbon dioxide to obtain pyridine-containing phenolic compounds, then use 80% phosphoric acid solution as solvent-6 to dehydrate and deslag-containing pyridine-containing phenolic compounds 5 at 1:12 (phosphoric acid solution and pyridine-containing The mass ratio of the phenolic compound) is used to extract the p...

example 2

[0051] A low-temperature coal tar from Xinjiang, density 0.97g / cm2 at 20°C 3 , the initial boiling point is 145°C, the final boiling point is 585°C, the sulfur content is 0.12%, and the nitrogen content is 0.94%.

[0052] The coal tar 1 is fractionated 2 by a coal tar fractionation tower to obtain a narrow distillate 3 at 145-280°C. Firstly, the narrow distillate oil is washed with 20% sodium hydroxide solution for dephenolization 4, the phenolic compounds in the distillate oil are changed into phenolic sodium salt, and then the phenolic sodium salt and dephenolic oil 9 are separated by using the density difference , sodium phenate is decomposed by carbon dioxide to obtain pyridine-containing phenolic compounds, then use 98% sulfuric acid solution as solvent-6 to dehydrate and deslag-containing pyridine-containing phenolic compounds 5 at 1:10 (sulfuric acid solution and pyridine-containing The mass ratio of the phenolic compound) is used to extract the pyridine compound, and ...

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Abstract

The present invention provides a method for extraction of pyridine compounds from coal tar, the method includes the units of fractional distillation of coal tar into narrow fractions, extraction of phenolic compounds from the narrow fractions, extraction of pyridine compounds from the phenolic compounds by use of solvent I, extraction of pyridine compounds from dephenolized oil by use of pyridine compound salt-base 1, neutralization of pyridine compound salt-base 2 s by use of solvent II, and refining of crude pyridine compounds. By the method, the pyridine compounds in the phenolic compounds and the pyridine compounds in the dephenolized oil are extracted, the goal of full recovery of the pyridine compounds can be achieved, and the entire process is free of pollutants.

Description

technical field [0001] The invention relates to a method for extracting pyridine compounds from coal tar, belonging to the technical field of coal chemical industry. Background technique [0002] my country is rich in coal tar resources. Coal tar contains a certain amount of phenolic compounds and pyridine compounds. Although the content of these compounds is not very high, they are rare, rare and valuable resources. But so far, the research basically only considers the separation of phenolic compounds, but does not consider the separation of pyridine compounds, and there is no relevant teaching on how to extract pyridine compounds in coal tar. [0003] However, the existence of pyridine compounds in coal tar has many hazards: hydrogenation of pyridine compounds will generate ammonia, which increases hydrogen consumption on the one hand, and on the other hand, the generated ammonia is likely to poison the hydrogenation catalyst; Pyridine compounds will affect the quality o...

Claims

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Application Information

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IPC IPC(8): C10C1/04C07D213/16C07D213/127C07C37/86C01B25/32C01F11/46
CPCC01B25/32C01F11/46C07C37/86C07D213/127C07D213/16C10C1/04
Inventor 王守峰王永飞艾天吕子胜赵宁述子清王雄雄姬瑞刘伟王朝阳
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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