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Method for extracting phenolic substance from coal tar or direct coal liquefaction oil

A technology for directly liquefying oil and phenolic substances from coal is applied in the field of coal chemical industry, and can solve the problems of low recovery rate of phenol, high energy consumption for recovery of extractant and back-extractant, and low recovery rate.

Active Publication Date: 2017-07-28
广州美加华商投资顾问有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN104845662A discloses a method for extracting phenolic substances in coal tar fractions using strong base and weak acid salt as extraction agent and dichloromethane as stripping agent. Although the method is less corrosive, the recovery of strong base and weak acid salt Low rate, low recovery rate of phenol
CN102731262A discloses a method for extracting phenols in coal-based oil by using substances containing calcium hydroxide or calcium oxide. After the coal-based oil is mixed with calcium hydroxide or calcium oxide solution to extract phenols, CO 2 Acidification to obtain crude phenol oil and limestone. This method severely corrodes the equipment, and a large amount of alkali slag is produced after acidification, which is difficult to handle and has a great impact on the environment.
The above-mentioned three inventive methods all have no waste water discharge, do not consume acid and alkali, but there are problems such as high energy consumption and low recovery rate of extraction agent and stripping agent recovery, neutral oil entrainment in crude phenol oil, etc.

Method used

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  • Method for extracting phenolic substance from coal tar or direct coal liquefaction oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Add 67.0g of ethanolamine aqueous solution with a concentration of 60% and 40.0g of coal tar fraction oil with a distillation range of 120-340°C and a total phenol content of 47.7% into a 250ml three-necked flask with stirring, and fully stir at 60°C and normal pressure After 1 hour, 23.0 g of dephenolized oil and 83.3 g of octopamine-containing aqueous solution were obtained after liquid separation. Put the octopamine-containing aqueous solution into a 150ml flask, and pass through industrial CO at 60°C and normal pressure 2 The gas was acidified, cooled after 1h, and separated to obtain 19.9g of crude phenol oil and 71.6g of CO rich 2 ethanolamine in water; will be enriched with CO 2 The organic amine aqueous solution was placed in a flask and heated to 80°C for desorption, and stirred at normal pressure for 1 hour to obtain 64.9 g of regenerated ethanolamine aqueous solution. All contain a small amount of ethanolamine and water in the dephenolized oil and crude phe...

Embodiment 2～7

[0065] Embodiments 2-7: The device, method and steps are the same as in Embodiment 1, and other implementation conditions and results are listed in Table 1.

Embodiment 8

[0066] Embodiment 8: device, method and step are identical with embodiment 1, but make extraction agent with pure ethanolamine, add water and dissolve into 50% aqueous solution in extraction phase, again with industrial CO 2 The gas is used to acidify it, and other implementation conditions and results are listed in Table 1.

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Abstract

The invention discloses a method for extracting phenolic substance from coal tar or direct coal liquefaction oil, wherein the method mainly includes several processes or steps: (1) applying extracting agent to extract phenolic substance from coal tar or direct coal liquefaction oil, wherein the extracting phase is dephenolized oil, and the extracting phase is the extracting agent enriched in phenolic substance; (2) applying the acidifying agent to acidify the extracting phase, and acquiring crude phenol oil and extracting agent rich in acidifying agent; (3) under the heating and / or depressurizing condition, performing the acidifying agent removal and extracting agent regeneration, circularly using the regenerated extracting agent, and circularly using the removed acidifying agent; (4) recycling a few amount of extracting agent in the dephenolized oil and crude phenol oil by water extraction, distillation and other regular method.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for extracting phenolic substances from coal tar or coal direct liquefied oil through extraction. Background technique [0002] Coal tar or direct coal liquefied oil is a complex mixture of tens of thousands of components. For example, there are more than 500 single compounds that have been separated and identified from coal tar, including phenol, naphthol and alkylphenol63 an acidic component. Phenolic substances in coal tar or coal direct liquefied oil account for about 10% to 30% of its total mass. The existence of these phenolic substances has adverse effects on their subsequent processing, such as the use of coal tar hydrogenation to produce light oil , the presence of phenolic compounds will increase the consumption of hydrogen, and the water generated by the hydrogenation of phenolic compounds will affect the activity and life of the catalyst, thereby affect...

Claims

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Application Information

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IPC IPC(8): C07C37/72C07C39/04C07C39/06C07C39/14C10C1/18
CPCC07C37/72C10C1/18C07C39/04C07C39/06C07C39/14
Inventor 罗和安李泳霖艾秋红游奎一严石
Owner 广州美加华商投资顾问有限公司
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