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Method for selectively separating phenol mixture from oil

A phenolic compound, selective technology, applied in the field of selective separation, can solve the problems of large acid-base solution consumption, high equipment requirements, pollution, etc., and achieve the goal of reducing the volume of the separator, reducing the cost of separation, and reducing the cost of separation Effect

Active Publication Date: 2015-09-30
TAIYUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this separation method has high selectivity, it needs to consume a large amount of acid-base solution and has high requirements for equipment; after pickling, a large amount of phenol-containing wastewater is produced, resulting in complicated post-treatment process and serious environmental pollution; due to the phenolic mixture The boiling point is close, resulting in high energy consumption for separation
In addition to the above separation methods, methods currently being studied include superheated water extraction, brine extraction, and alcohol-water extraction separation. Although these can separate phenolic compounds from oil to a certain extent, they still require a large amount of Organic solvents or water also have serious pollution and low separation efficiency
The use of water will produce a large amount of phenolic wastewater, and the use of organic solvents cannot avoid the loss of solvents caused by the dissolution of organic solvents in oil, resulting in higher separation costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The simulated oil is 80% toluene + 20% n-hexane (volume ratio) solution containing different phenols, in which the content of phenol is 100.1g / L, the content of o-cresol is 99.2g / L, and the content of 2,6-xylenol is 99.5g / L L. Take 500 mL of simulated oil, and extract and separate phenolic compounds with choline chloride at a temperature of 5°C.

[0028] Add 37.1g of choline chloride to the simulated oil for the first time, which is 50% of the molar number of phenol, stir for 10 minutes, and let stand for 5 minutes. The system is divided into two phases, and then separated to obtain the lower phase eutectic solvent and the upper phase. Simulated oil after phenol. The first extraction obtains 98.1g eutectic solvent, analysis composition (get a small amount of sample, dissolve phenol and neutral oil with dichloromethane, then adopt gas chromatography to analyze composition, calculate and obtain the amount of substance in eutectic solvent. The following analytical methods...

Embodiment 2

[0032] The simulated oil is 80% toluene + 20% n-hexane (volume ratio) solution containing different phenols, in which the content of phenol is 100.1g / L, the content of o-cresol is 99.2g / L, and the content of 2,6-xylenol is 99.5g / L L. Take 500 mL of simulated oil, and extract and separate phenolic compounds with tetramethylammonium chloride at a temperature of 5°C.

[0033] For the first time, add 29.1 g of tetramethylammonium chloride to the simulated oil, which is 50% of the molar number of phenol, stir for 10 minutes, and let it stand for 5 minutes. The system is divided into two phases, and then separated to obtain the lower phase eutectic solvent and the upper phase Simulated oil after removal of phenols. The first extraction yielded 96.1 g of eutectic solvent, and its composition was analyzed, wherein the neutral oil content was 11.2%. Under the conditions of a temperature of 80°C and a pressure of 0.02 atm, the neutral oil in the obtained eutectic solvent was removed b...

Embodiment 3

[0037] The simulated oil is 80% toluene + 20% n-hexane (volume ratio) solution containing different phenols, in which the content of phenol is 100.1g / L, the content of o-cresol is 99.2g / L, and the content of 2,6-xylenol is 99.5g / L L. Take 500 g of simulated oil, and extract and separate phenolic compounds with tetraethylammonium chloride at a temperature of 5°C.

[0038] For the first time, add 44.1 g of tetraethylammonium chloride to the simulated oil, which is 50% of the molar number of phenol, stir for 10 minutes, and let stand for 5 minutes. The system is divided into two phases, and then separated to obtain the lower phase eutectic solvent and the upper phase Simulated oil after removal of phenols. The first extraction yielded 117.2 g of eutectic solvent, and the composition was analyzed, and the neutral oil content was 10.3%. Under the conditions of a temperature of 80°C and a pressure of 0.02 atm, the neutral oil in the obtained eutectic solvent was removed by rotary ...

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Abstract

The invention relates to a method for selectively separating a phenol mixture from oil, which comprises the following steps: by using a quaternary ammonium salt as a separating agent, selectively forming a congruent melting liquid from the separating agent and phenol compounds (phenol, cresol and dimethyl phenol) in the oil at 0-30 DEG C, thereby separating the phenol compounds from the oil; and carrying out back extraction on the phenol compounds containing the congruent melting liquid to separate the phenol substances from the quaternary ammonium salt, thereby obtaining the product and recovering the extractant. The method has the advantages of simple technique, low separate cost and environment friendliness.

Description

technical field [0001] The invention relates to a method for selectively separating phenolic compounds from aromatic and aliphatic hydrocarbon mixtures. Background technique [0002] Phenolic compounds are an important class of chemical raw materials, widely used in fiber, plastics, pesticides, medicine, preservatives, explosives synthesis and other fields. Coal pyrolysis oil, coal hydrogenation liquefaction oil and biomass pyrolysis oil contain a large amount of phenolic compounds, such as phenol, cresol, xylenol and other substances. The traditional method of separating phenolic compounds from these oils is at first to adopt lye chemical extraction method, the principle of lye (such as sodium hydroxide solution) extraction method is to utilize phenolic compounds to have weak acidity, after reacting with sodium hydroxide, A water-soluble sodium phenate solution is formed, and the phenolic compounds are transferred from the oil phase to the water phase to achieve the purpos...

Claims

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Application Information

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IPC IPC(8): C10G53/06C07C39/04C07C39/07C07C37/70
Inventor 侯玉翠杨春梅李慧
Owner TAIYUAN NORMAL UNIV
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