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Method for separating phenols compounds from phenol-containing raw material oil

A technology of phenolic compounds and raw oil, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of serious corrosion, complexity, and high energy consumption of equipment, and reduce sewage discharge, improve the environment, The effect of low energy consumption

Active Publication Date: 2008-03-19
FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is relatively complicated, and the use of strong alkali to operate at a higher temperature not only consumes a lot of energy, but also seriously corrodes the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0023] Mix 100 g of raw material 2 with saturated ammonia solution, the volume ratio of oil agent is 1:5, the reaction temperature is 35° C., and the contact time is 25 minutes to separate the two phases. The obtained aqueous ammonium salt solution containing phenolic compounds was passed through carbon dioxide at 25° C., the ammonium salts of phenolic compounds were decomposed, and phenolic compounds, ie crude phenol, were liberated. The yield of crude phenol was 95%. Carbon dioxide with ammonia and NH 4 + Form NH 4 HCO 3 , stop feeding carbon dioxide when the pH value reaches 6.5. Will NH 4 HCO 3 The aqueous solution is heated to 85°C, NH 4 HCO 3 Decompose into ammonia and carbon dioxide gas, ammonia dissolves in water, carbon dioxide is discharged, when the pH value of the solution reaches 10, stop heating. Carbon dioxide and ammonia are recycled.

Embodiment 3

[0025] According to Example 1, use saturated ammonia water with a weight concentration of 10% ammonia solution, the volume ratio of the raw material to the ammonia solution is 1:6, and react at 25°C for 20 minutes, and the phenolic compound in the raw material reacts with ammonia to generate ammonium salt , separated from the raw material, dissolved in ammonia solution, and separated the oil phase and the water phase. Then, at the same temperature, carbon dioxide gas is passed into the water phase, and the ammonium salt of the phenolic compound is decomposed, and the phenolic compound, that is, crude phenol, is released, and the yield reaches 95%. Carbon dioxide with ammonia and NH 4 + Form NH 4 HCO 3 , stop feeding carbon dioxide when the pH value reaches 7. Heat the aqueous phase to 75°C, NH 4 HCO 3 Decompose into ammonia and carbon dioxide gas, ammonia dissolves in water, carbon dioxide is discharged, when the pH value of the solution reaches 11, stop heating. Carbon...

Embodiment 4

[0027] According to embodiment 3, ammonia solution is 25wt%, and the volume ratio of raw material and ammonia solution is 1: 3, and reaction temperature is 15 ℃, and the reaction time is 30 minutes, and the phenolic compound in the raw material reacts with ammonia to generate ammonium salt, from raw material Come out, dissolve in ammonia solution, and separate the oil and water phases. Then, at the same temperature, the ammonium salt of the phenolic compound is decomposed into the water phase with carbon dioxide gas, and the phenolic compound, namely crude phenol, is released, and the yield reaches 96%. Carbon dioxide with ammonia and NH 4 + Form NH 4 HCO 3 . When the pH value reached 6.5, stop feeding carbon dioxide. Heat the aqueous phase to 65°C, NH 4 HCO 3 Decompose into ammonia and carbon dioxide gas, ammonia dissolves in water, carbon dioxide is discharged, when the pH value of the solution reaches 10, stop heating. Carbon dioxide and ammonia are recycled.

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Abstract

The invention relates to a method which separates a phenolic compound from raw oil containing phenol. Under a certain condition, the raw oil containing the phenol is mixed with saturated aqueous ammonia for reaction, the phenol and ammonia form ammonium salt which is dissolved in aqueous phase, the phenol is separated from the raw oil, and liquid is divided into two layers, that is, oil phase is separated from the water phase. Carbon dioxide directly enters into ammonium salt aqueous solution, the carbon dioxide reacts on ammonium salt, so that ammonia bicarbonate is formed, and crude phenol is dissociated. The method of the invention can improve the erosion of devices and discharge of sewage and reduce energy consumption, and operation is simple. The method of the invention is applied to producing crude phenol from all raw oils containing phenol.

Description

technical field [0001] The invention relates to a method for removing phenols from phenol-containing materials, that is, a method for separating phenolic compounds from phenol-containing raw material oil. Background technique [0002] The raw material oil for the production of phenolic compounds by the separation method is mainly coal tar, and the coal tar is distilled to cut phenolic oil fractions, and then the phenolic compounds and hydrocarbon oils are separated. In the prior art, the industrial production of separating phenol from coal tar mainly adopts the acid-base elution technology, the principle is to utilize the weak acidity of phenolic compounds to react with sodium hydroxide or potassium hydroxide to form sodium hydroxide which is easily soluble in water. Salt or potassium salt solution is transferred from the tar phase to the water phase to achieve the purpose of separation and recovery. Its process engineering is to use excess sodium hydroxide or potassium hyd...

Claims

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Application Information

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IPC IPC(8): C07C37/68C07C39/00
Inventor 苏重时赵桂芳王立言
Owner FUSHUN RES INST OF PETROLEUM & PETROCHEMICALS SINOPEC CORP
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