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Method of extracting phenolic compound from coal liquefied oil or coal tar

A technology of phenolic compounds and coal liquefied oil, applied in the field of coal chemical industry, can solve the problems of huge investment, limited extraction rate of phenol, and low purity of phenol products.

Active Publication Date: 2011-10-19
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has strict requirements on equipment and huge investment, and the extraction rate of phenol is limited. During the process, various substances and phenols co-precipitate, and the purity of phenol products is not high.
[0006] 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 of extracting phenolic compound from coal liquefied oil or coal tar
  • Method of extracting phenolic compound from coal liquefied oil or coal tar
  • Method of extracting phenolic compound from coal liquefied oil or coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, extract phenolic compound from coal direct liquefaction oil

[0029] The raw material to be treated is taken from the liquid product obtained on the 0.1t / d coal direct liquefaction continuous test device, and its elemental analysis results are shown in Table 1.

[0030] Table 1 Elemental analysis results of direct coal liquefaction oil

[0031]

[0032]

[0033] The main phenolic compounds were qualitatively and quantitatively analyzed by means of GC-MS chromatography-mass spectrometry, and their specific compositions are shown in Table 2.

[0034] Table 2 Analysis results of phenolic compounds in direct coal liquefaction oil

[0035]

[0036] The content of phenolic compounds in coal liquefied oil is about 14.5% (IBP~350°C). After the first step of distillation, the target fraction of 160~230°C is cut. This fraction accounts for about 22% of the total raw materials, and phenol Phenolic compounds account for about 56%, of which the lower phenols, ...

Embodiment 2

[0039] Embodiment 2, continuous device extracts phenolic compounds from medium and low temperature coal tar

[0040] The raw material is taken from a typical medium-low temperature coal tar produced by a coal chemical enterprise in the west. It has been measured that the water content is about 15%. Atmospheric distillation cuts a fraction at 150-210°C, which accounts for about 18% of the overall raw material. It is measured that the content of phenolic compounds is as high as more than 80%.

[0041] Gas chromatography quantitative analysis was carried out on this fraction section, and the specific results are shown in Table 3.

[0042] Analysis results of phenolic compounds in low temperature coal tar in Table 3

[0043]

[0044]

[0045] The operation process of the continuous device has been described in detail in the above summary of the invention, and the main operating data are listed in Table 4 below.

[0046] Table 4 The main operating data of the continuous pro...

Embodiment 3

[0049] Embodiment 3, extract phenolic compound from medium temperature coal tar

[0050] The raw material is obtained from a semi-coke production enterprise in the Inner Mongolia Autonomous Region. The water content of medium-temperature coal tar is about 5%. It is measured that the content of phenolic compounds reaches more than 57%.

[0051] Carry out gas chromatography quantitative analysis to this cut section, the results are as shown in table 4:

[0052] Table 4 Analysis results of phenolic compounds in medium temperature coal tar

[0053]

[0054]

[0055] The content of phenolic compounds in this fraction is relatively high. The target fraction is extracted by two-stage countercurrent and centrifuged. The mass ratio of ethylene glycol to fraction is 10:1, the average residence time is 50min, and the temperature is about 20°C. After extraction, the extraction rate of phenol can reach 75%, and the entrainment of neutral oil accounts for about 6.2% of the whole ext...

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Abstract

The invention relates to the field of coal chemical industry, and more specifically relates to a method of extracting phenolic compounds from coal liquefied oil or coal tar. The method comprises the following steps: 1) distilling coal liquefied oil or coal tar and cutting to obtain fractions at a temperature of 260 DEG C; 2) mixing an extractant with the obtained fractions and layering the extractant; 3) separating and collecting the extractant layer which contains phenolic compounds; 4) carrying out multistage back extraction on the phenolic compounds so as to obtain a stripping agent-phenol solution and an extractant; 5) separating the stripping agent-phenol solution by rectification, recovering the stripping agent for cyclic utilization, and carrying out separation to obtain crude phenols; 6) removing entrained neutral oil in phenolic compounds by water vapour so as to obtain crude phenol products. The method of extracting phenolic compounds from coal liquefied oil or coal tar provided in the invention avoids the usage of soda acid, exerts no influence on subsequent treating processes, and guarantees high recovery rate and purity of phenols.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for extracting phenolic compounds from coal liquefied oil or coal tar. Background technique [0002] Coal liquefied oil and coal tar contain abundant and considerable amounts of phenolic compounds. The content of phenolic compounds in coal direct liquefaction products is as high as 20%, while the content of phenolic compounds and their derivatives in coal tar can reach 20%. ~30%, the existence of these phenolic compounds will have many problems in the subsequent hydrogenation process of coal liquefied oil and coal tar, not only will increase the hydrogen consumption in the process, but also the water generated by the reaction will have adverse effects on the activity and life of the catalyst influence and increase the severity of the subsequent hydrogenation reaction. On the other hand, phenolic compounds have a wide range of applications and are raw materials for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/04C07C39/07C07C39/06C07C39/17C07C39/14C07C39/15C07C37/76
Inventor 赵渊黄彭毛学锋张晓静李文博朱晓苏杜淑凤李培霖王勇孙竞晔谷小会艾军赵鹏颜丙峰朱肖曼吴艳胡发亭石智杰
Owner CCTEG CHINA COAL RES INST
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