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Method for extracting phenol compounds from direct coal liquefied oil through extractive distillation

A technology for direct coal liquefaction of oil and phenolic compounds, applied in the field of coal chemical industry, can solve problems such as poor effect, achieve broad application prospects, no waste water, and high-efficiency separation

Active Publication Date: 2015-03-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this method is that the extracted phenolic products contain more neutral oil, which is seriously entrained and the effect is poor. Further extraction of neutral oil with steam will produce a large amount of phenolic wastewater.

Method used

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  • Method for extracting phenol compounds from direct coal liquefied oil through extractive distillation
  • Method for extracting phenol compounds from direct coal liquefied oil through extractive distillation
  • Method for extracting phenol compounds from direct coal liquefied oil through extractive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In Example 1, the first phenol-rich distillate at 170-200°C uses a mixed solvent of sulfolane and triethylene glycol (mass ratio 1:1) as the No. 1 solvent, and the second phenol-rich distillate at 200-230°C uses triacetin The mixed solvent of ester and triethanolamine (mass ratio 2:1) was used as the No. 2 solvent.

[0036] Table 1 Dephenolization process conditions of the first phenol-rich distillate at 170-200°C in Example 1

[0037] Process conditions Extractive distillation column T1 Recovery Tower T2 Number of plates 15 10 No. 1 solvent / first phenol-rich distillate (mass ratio) 1.2 - Reflux ratio 2 3 Tower top temperature ℃ 183.5 213.2 Bottom temperature °C 246.2 301.4 Tower top pressure MPa 0.101 0.101 Tower bottom pressure MPa 0.111 0.111

[0038] Table 2 Properties of various streams during dephenolization of the first phenol-rich distillate oil at 170-200°C in Example 1

[0039]

[0040] Tab...

Embodiment 2

[0045] In Example 2, the first phenol-rich distillate at 170-200°C uses sulfolane as the No. 1 solvent, and the second phenol-rich distillate at 200-230°C uses glycerol triacetate as the No. 2 solvent.

[0046] Table 5 Dephenolization process conditions of the first phenol-rich distillate at 170-200°C in Example 2

[0047] Process conditions Extractive distillation column T1 Solvent Recovery Tower T2 Number of plates 16 11 No. 1 solvent / first phenol-rich distillate (mass ratio) 1.3 - Reflux ratio 2 3 Tower top temperature ℃ 180.6 210.3 Bottom temperature °C 245.1 302.3 Tower top pressure MPa 0.101 0.101 Tower bottom pressure MPa 0.111 0.111

[0048] Table 6 Properties of various streams during dephenolization of the first phenol-rich distillate oil at 170-200°C in Example 2

[0049]

[0050] Table 7 Dephenolization process conditions of the second phenol-rich distillate at 200-230°C in Example 2

[0051] ...

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Abstract

The invention relates to a method for extracting phenol compounds from direct coal liquefied oil through extractive distillation. An extractive distillation solvent (hereinafter referred to as solvent) adopted in the method is glyceryl triacetate and / or sulfolane, or a mixed solvent formed by mixing glyceryl triacetate and / or sulfolane and one or more selected from glycerol, triethanolamine, triethylene glycol, tetraethylene glycol, dimethyl sulfoxide and diethanol amine according to any proportion. The method is used for extracting phenol compounds from direct coal liquefied oil in an extraction distillation tower by using the solvent, then, a solvent flow rich in the phenol compounds enters a recovery tower and is separated, the phenol compounds discharged from the top of the recovery tower are recovered after being cooled to obtain phenol products, and the solvent is recycled after being discharged from the bottom of the recovery tower. The method has the characteristics of high product purity, low system energy consumption, no wastewater generation, no acid and alkaline waste and no corrosion to equipment.

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 direct liquefied oil by means of extractive distillation. It belongs to the processing method of coal direct liquefaction industry in coal chemical industry. Background technique [0002] Phenolic compounds are a general term for a series of aromatic derivatives with one or more hydroxyl groups. During the processing of coal liquefied oil products, it is found that phenolic compounds will affect the stability of oil products and the performance of circulating solvents in the coal liquefaction process due to their special structural characteristics, so the phenolic compounds in coal liquefied oil are separated The substance will help the storage and transportation of oil products, and optimize the process structure. Phenolic compounds are weakly acidic and are the main components of oxygenated compounds in coal liquefied ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/80C07C37/74C10G7/08
CPCC07C37/80C10G7/08
Inventor 冯杰李晓红郝建树樊文俊李文英
Owner TAIYUAN UNIV OF TECH
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