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Separation method for phenol compounds in oil

A technology for separation of phenolic compounds and separation methods, applied in the separation of aromatic hydrocarbon mixtures, in the field of phenols, can solve the problems of complex post-treatment process, consumption of large acid-base solution, pollution of the environment, etc., achieve low separation cost and prevent phenol-containing wastewater , the effect of avoiding environmental pollution

Active Publication Date: 2013-03-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the sodium hydroxide solution elution method has high selectivity, it needs to consume a large amount of acid-base solution and has high requirements for equipment. Moreover, when there are both bases and phenols in the fraction, such as pyridine bases, the pyridine bases and phenols will form Complexes, unfavorable to alkaline washing
More importantly, after pickling, a large amount of phenolic wastewater is produced, resulting in complicated post-treatment process and serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example illustrates the great advantages of the new method over industrial methods.

[0034] The industrial sodium hydroxide solution elution method uses a sodium hydroxide solution with a mass fraction of 10% to 15% for washing, and 40ml of a 15% sodium hydroxide solution is added to 20ml of simulated oil (97.67g / L toluene solution with phenol ), stirring for 20min. After the lower water phase was evaporated to remove oil for 30 minutes, 10 ml of sulfuric acid solution with a mass fraction of 60% was added to acidify, the recovery rate of phenol was 95%, sodium hydroxide, sulfuric acid solution was not recyclable, and 38 ml of phenol-containing wastewater was produced.

[0035] The process conditions illustrated in this embodiment are: phenol is dissolved in toluene to prepare a simulated oil solution, the concentration is 97.67g / L, and the quaternary ammonium salt is choline chloride (HOEt(Me) 3 NCl), the molar ratio of choline chloride to phenol in the tolu...

Embodiment 2

[0041] The process conditions illustrated in this embodiment are: phenol is dissolved in toluene to prepare a simulated oil solution, the concentration is 97.67g / L, the quaternary ammonium salt is choline chloride, the molar ratio of phenol in choline chloride to toluene solution is 0.8, and the separation temperature The temperature is 50°C, and the stirring time is 15 minutes.

[0042] At 50°C, 2.893g of choline chloride was added to 20ml of oil solution, stirred for 15 minutes and then allowed to stand for 5 minutes. The volume and phenol content of the upper oil phase were measured, and the removal rate of phenol was 89.0%.

[0043] The upper oil phase was removed, and the lower eutectic phase was vacuum-dried at 80°C for 1 h. After cooling, 20 ml of ether was added, stirred for 15 min, then allowed to stand for 5 min, and choline chloride was recovered after centrifugation and drying.

[0044]

Embodiment 3

[0046] The process conditions described in this embodiment are: phenol is dissolved in toluene to prepare a simulated oil solution, the concentration is 97.67g / L, the quaternary ammonium salt is choline chloride, the molar ratio of phenol in the choline chloride to toluene solution is 1, the separation temperature 0°C, stirring time 15min.

[0047] At 0°C, 2.893g of choline chloride was added to 20ml of oil solution, stirred for 15 minutes and then allowed to stand for 5 minutes. The volume and phenol content of the upper oil phase were measured, and the removal rate of phenol was 86.0%.

[0048]The upper oil phase was removed, and the lower eutectic phase was vacuum-dried at 80°C for 1 h. After cooling, 20 ml of ether was added, stirred for 15 min, then allowed to stand for 5 min, and choline chloride was recovered after centrifugation and drying.

[0049]

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PUM

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Abstract

The present invention provides a separation method for phenol compounds in oil. The method comprises: adopting a quaternary ammonium salt as a separation agent to separate phenol compounds in oil, and adopting an ether to re-crystallize the quaternary ammonium salt from a eutectic substance. With the method, use of a large amount of acid solutions and alkali solutions, and generation of a large amount of phenol-containing wastewater are avoided, the separation device body is reduced, the separation agent can be reused, recovery rate is high, cost is reduced, and the conventional oil phenol separation steps are substantially simplified.

Description

technical field [0001] The invention relates to the field of separation of coal chemical industry and petrochemical industry, in particular to a method for separating phenol and aromatic hydrocarbon mixture. [0002] Background technique [0003] Phenolic compounds are one of the basic chemical raw materials and are widely used in the fields of fiber, plastic, pesticide, medicine, preservative, and explosive synthesis. They mainly come from coal direct liquefaction products, coal tar and petroleum products. In recent years, the research on extracting phenolic compounds from coal direct liquefaction products, coal tar and petroleum products has attracted extensive attention of researchers at home and abroad. [0004] The traditional method is to use sodium hydroxide solution for elution. The principle of the elution method is to utilize the weak acidity of phenolic compounds to react with a strong base to form a water-soluble sodium phenolic salt solution to remove phenolic...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 吴卫泽庞昆
Owner BEIJING UNIV OF CHEM TECH