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Method for recovering phenol from diphenyl ether preparation process wastewater

A recovery method and technology of preparation process, applied in ether preparation, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of volatile solvent loss, difficult solvent separation, increased energy consumption, etc. Take advantage of the effects of high efficiency and reduced processing costs

Pending Publication Date: 2021-03-12
宁夏中能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for the preparation of diphenyl ether in view of the problems of volatile loss of solvents, secondary pollution caused by the introduction of solvents, difficulty in solvent separation and increased energy consumption when the existing extraction technology treats diphenyl ether process wastewater. The recovery method of phenol in the process wastewater uses diphenyl ether as the extraction agent, and achieves the efficient combination of the extraction unit and the diphenyl ether preparation process unit through process design

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  • Method for recovering phenol from diphenyl ether preparation process wastewater
  • Method for recovering phenol from diphenyl ether preparation process wastewater

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Embodiment 1

[0033] Such as figure 1 As shown, the present embodiment provides a method for recovering phenol in diphenyl ether preparation process wastewater, comprising the following steps:

[0034] Step 1, in the diphenyl ether preparation process unit, the raw material phenol is reacted in a reactor to generate diphenyl ether, water and trace organic impurities, and the diphenyl ether, water and trace organic impurities together with unreacted raw material phenol form a reaction material;

[0035] Step 2, the reaction material obtained in step 1 is firstly treated by the dehydration tower, the waste water containing phenol is separated from the top of the dehydration tower and then enters the extraction unit, and the mixture of diphenyl ether, phenol and trace organic impurities flows out from the bottom of the dehydration tower Then enter the dephenolization tower;

[0036] Step 3, the phenol separated from the top of the dephenolization tower is directly reused as the reaction raw m...

Embodiment 2

[0043] The difference between the recovery method of phenol in the diphenyl ether preparation process wastewater provided in this example and Example 1 is:

[0044] The extraction unit is designed as a three-stage continuous extraction process, which is realized through three connected extraction towers. The phenol-containing wastewater separated from the dehydration tower enters the primary, secondary, and tertiary extraction towers from the lower end of the tower in turn, and the diphenyl ether semi-finished product separated from the dephenolization tower enters the extraction unit and is divided into three paths, respectively. The upper end of the tower enters the first, second and third extraction towers. In each extraction tower, the volume flow rate of diphenyl ether semi-finished product and phenol-containing wastewater is 1:1, and the temperature is 30°C.

[0045] After extraction, the phenol-containing diphenyl ether semi-finished products flow out from the bottom o...

Embodiment 3

[0049] The difference between the recovery method of phenol in the diphenyl ether preparation process wastewater provided in this example and Example 1 is:

[0050] The extraction unit is designed as a two-stage continuous extraction process, which is realized by two connected extraction towers. The phenol-containing wastewater separated from the dehydration tower enters the primary and secondary extraction towers sequentially from the lower end of the tower, while the diphenyl ether semi-finished product separated from the dephenolization tower enters the extraction unit and is divided into two paths, respectively entering from the upper end of the tower. Primary and secondary extraction towers. In each extraction tower, the volume flow rate of diphenyl ether semi-finished product and phenol-containing wastewater is 3:1, and the temperature is 30°C.

[0051] After extraction, the phenol-containing diphenyl ether semi-finished products flow out from the bottom of the primary ...

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Abstract

The invention discloses a method for recovering phenol from diphenyl ether preparation process wastewater. The semi-finished product diphenyl ether of a diphenyl ether preparation process is adopted as an extractant, diphenyl ether is a semi-finished product in the production process and does not need to be purchased so that the treatment cost is reduced, and other extractants which may cause phenol pollution are erplaced with diphenyl ether. The quality of the recovered phenol is favorably ensured, and the quality reduction of a diphenyl ether product caused by phenol pollution is avoided; the method has the advantages that the phenol recovering rate is guaranteed through multi-stage extraction, the extraction agent diphenyl ether and phenol are efficiently separated through the separation tower in the diphenyl ether preparation process, the phenol recovering process flow is simplified, the investment of phenol recovering unit process equipment is reduced, and the production cost is reduced. Besides, according to the recovering method, efficient combination of the extraction unit and the diphenyl ether preparation process unit is achieved through process design, continuous operation of the two process units is achieved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of phenol recovery, in particular to a method for recovering phenol in diphenyl ether preparation process wastewater. Background technique [0002] Diphenyl ether, also known as diphenyl ether, is a widely used compound, which can be used as a component in high-temperature solvents, gas chromatography stationary liquids, and soaps, and can also be used to prepare intermediates for flame retardants and surfactants. In addition, it is also an important raw material for preparing standard heat transfer fluids for solar thermal power generation. [0003] At present, the world's leading diphenyl ether preparation process is the method of direct dehydration condensation of phenol, and the chemical equation involved is as follows: [0004] [0005] It can be seen from the above reaction that for every molecule of product diphenyl ether generated during the reaction, a molecule of water will be produced. The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/72C07C39/04C07C41/34C07C43/275
CPCC07C37/685C07C37/72C07C41/34
Inventor 吴朝阳王志钢
Owner 宁夏中能新材料科技有限公司