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Method and device for extracting and separating phenolic compounds from coal derived oil

A technology of phenolic compounds and extraction equipment, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve problems such as environmental pollution, low efficiency of multi-stage stripping and extraction of phenols, and cumbersome process, so as to avoid A large amount of high-salt wastewater, high efficiency of extraction and extraction of phenols, and the effect of improving environmental benefits

Inactive Publication Date: 2017-01-04
CCTEG CHINA COAL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing technology for separating and extracting phenolic compounds mainly adopts the acid-base elution method in industry, and uses the acidity of phenolic substances to neutralize them with aqueous sodium hydroxide solution. The resulting sodium phenolate is insoluble in the oil phase and transferred to water. phase, and then use carbon dioxide or sulfuric acid to reduce the sodium phenolate to phenolic substances. Practice shows that acid-base cleaning requires a large amount of strong acid and strong alkali aqueous solution, and there are the following problems: (1) a large amount of strong acid and strong alkali are easy to corrode process equipment , affecting the normal use of the equipment; (2) a large amount of strong acid and strong alkali aqueous solution will cause a large amount of phenol-containing wastewater to be produced during the separation process, which is likely to cause environmental pollution, and a large amount of K and Na ions in the wastewater are difficult to treat in the subsequent biochemical treatment; (3) acid The water content in the crude phenol product separated and extracted by the alkali elution method is relatively large (the relevant standard stipulates 10%), which increases the difficulty of follow-up treatment and processing costs; The extraction tower occupies a large area and consumes a lot of energy
In this process, the efficiency of multi-stage back extraction of phenol is low, and the entrainment of neutral oil is large, which affects the purity of phenols. Water vapor removes impurities such as neutral oil and consumes a lot of energy.

Method used

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  • Method and device for extracting and separating phenolic compounds from coal derived oil
  • Method and device for extracting and separating phenolic compounds from coal derived oil
  • Method and device for extracting and separating phenolic compounds from coal derived oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A typical medium and low temperature coal tar in northern Shaanxi was selected as the raw material of this example. The properties of the raw material are shown in Table 1. After being desolidified and pretreated by a decanter centrifuge, it was input into a phenol-rich fraction distillation tower for distillation and cutting of the phenol-rich fraction. After distillation and cutting, a phenol-rich fraction at 170-230°C was obtained, and its properties are shown in Table 2.

[0083] The properties analysis results of the whole fraction of low temperature coal tar in Table 1

[0084]

[0085]

[0086] Properties of the phenol-rich fraction after pretreatment of low-temperature coal tar in Table 2

[0087]

[0088] The phenol-rich fraction obtained after the desolidification of the desolidification preprocessor 1 and the distillation and cutting of the phenol-rich fraction distillation tower 2 is uniformly mixed with the auxiliary agent through the online contin...

Embodiment 2

[0100] Example 2: Coal Direct Liquefaction Oil Extraction and Separation of Phenolic Compounds

[0101] The low-fraction oil obtained from a typical bituminous coal operated on a 0.1t / d coal direct liquefaction continuous test device, the properties of the low-fraction oil are shown in Table 6, and used as the raw material of this example, it was desolidified and pretreated by a decanter centrifuge. After the treatment, the phenol-rich fraction was input into a distillation tower for distillation and cutting of the phenol-rich fraction. After distillation and cutting, a phenol-rich fraction at 170-275°C was obtained. The properties of the phenol-rich fraction are shown in Table 7.

[0102] Table 6 Analysis results of low oil content in direct coal liquefaction

[0103]

[0104]

[0105] Table 7 Properties of phenol-rich fractions cut from direct coal liquefied oil distillation

[0106]

[0107] Since the phenol content in direct coal liquefaction oil is relatively lo...

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Abstract

The invention discloses a method and device for extracting and separating phenolic compounds from coal derived oil. The method comprises the following steps of performing distillation and cutting to obtain phenol-enriched distillation fractions: performing distillation, distillation fraction and cutting on the coal derived oil, and cutting out a phenol-enriched distillation fraction of a certain temperature segment; performing centrifugation, extraction and separation on a solvent: performing centrifugation and separation on the phenol-enriched distillation fraction, an extraction agent and an addition agent so as to obtain a liquid phase containing an extraction agent, wherein a light phase of the liquid phase containing the extraction agent is a dephenolization oil-addition agent solution, a heavy phase of the liquid phase containing the extraction agent is an enriched phenolic compound, and the extraction agent is an aqueous solution of one or more selected from butanone, cyclohexanol, dihydric alcohol and glacial acetic acid; performing centrifugation, backward extraction and separation; recovering the addition agent; recovering reverse extraction agents; and refining crude phenols: performing azeotropic distillation and separation on crude phenol raw materials containing a few extraction agents so as to obtain the extraction agent and crude phenol products.

Description

technical field [0001] The invention relates to the technical field of separation of coal chemical and petrochemical products, in particular to a method and device for extracting and separating phenolic compounds from coal-derived oil. Background technique [0002] During the conversion process of coal, such as pyrolysis, coking, and gasification, a large amount of coal-derived oil rich in phenolic compounds will be produced, such as coking by-product high-temperature tar with a phenol content of 1-2.5% (mass fraction, the same below), and coal direct liquefied oil The content of phenol in medium and low temperature coal tar is as high as 15% to 30%. At present, the existing technology for separating and extracting phenolic compounds mainly adopts the acid-base elution method in industry, and uses the acidity of phenolic substances to neutralize them with aqueous sodium hydroxide solution. The resulting sodium phenolate is insoluble in the oil phase and transferred to water....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/68C07C37/72C07C37/74C07C39/02
CPCC07C37/007C07C37/005C07C37/685C07C37/72C07C37/74
Inventor 毛学锋赵渊王利军李伟林王光耀杜淑凤李培霖张晓静张书锋梁江鹏赵鹏钟金龙王勇谷小会黄澎胡发亭刘华马博文朱肖曼颜丙峰李军芳陈来夫石智杰吴艳张帆
Owner CCTEG CHINA COAL RES INST
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