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A process and device for treating byproduct mixed waste salts during phenol production

A technology of production process and treatment process, which is applied in the direction of sulfate/bisulfate preparation, alkali metal sulfite/sulfate purification, etc., can solve the problem of unsatisfactory disposal of phenol mixed waste salt, and reduce the oxidation time , reduce the effect of COD

Active Publication Date: 2017-10-24
SHENYANG RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the conventional treatment method cannot meet the disposal problem of the mixed waste salt of the by-product sodium sulfite and sodium sulfate in the phenol production process

Method used

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  • A process and device for treating byproduct mixed waste salts during phenol production
  • A process and device for treating byproduct mixed waste salts during phenol production
  • A process and device for treating byproduct mixed waste salts during phenol production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Such as figure 1 As shown, the device includes an adsorption pretreatment unit, an ultrasonic oxidation treatment unit, and an ultrasonic crystallization unit, wherein the adsorption pretreatment unit includes a dissolution tank 1, an adsorption reactor 3, and a filter tank 4, and the ultrasonic oxidation treatment unit includes an ultrasonic oxidation reactor 6. The crystallization unit includes an ultrasonic crystallizer 9 and a crystallizer 8, the dissolution tank 1, the adsorption reactor 3, the filter 4, the ultrasonic oxidation reactor 6 and the ultrasonic crystallizer 9 are connected in sequence through pipelines, and the crystallizer 8 is located in the ultrasonic crystallizer. Below the salt outlet at the bottom of the device 9, the outlet pipe 19 on the crystallizer 8 is connected to the solution inlet 17 on the housing of the ultrasonic crystallizer 9, and the solution outlet A16 on the housing of the ultrasonic crystallizer 9 is connected to the dissolution t...

Embodiment 2

[0063] Under normal temperature conditions, 12kg of by-product mixed salt (solid mixed sulfate) in the phenol production process was added in the dissolution tank 1, and then 50L of water was added to the dissolution tank 1, stirred and dissolved, and the color of the solution was light yellow.

[0064] Use a pump to transport the light yellow solution to the adsorption reactor 3, and a stirrer 2 is installed on the upper part of the adsorption reactor 3, and the stirring paddle of the stirrer extends into the solution of the adsorption reactor 3 for stirring. Regulate the pH value with sulfuric acid in the adsorption reactor 3 to be 5, add gac, the dosage of described gac is 0.1% of the solution quality in the adsorption reactor 3, after stirring for 20min, remove the part organic matter in the mixed salt, and to The solution undergoes decolorization, and then the solution enters filter 4.

[0065] The filter 4 is divided into upper and lower layers, with a partition in the m...

Embodiment 3

[0070] Under normal temperature conditions, 18kg solid mixed sulfate is added in dissolving tank 1, then adds 50L water in dissolving tank 1, stirs and dissolves, and the solution color is light yellow.

[0071] Use a pump to transport the light yellow solution to the adsorption reactor 3, and a stirrer 2 is installed on the upper part of the adsorption reactor 3, and the stirring paddle of the stirrer extends into the solution of the adsorption reactor 3 for stirring. In the adsorption reactor 3, adjust the pH value to 5 with sulfuric acid, add activated carbon, the dosage of the activated carbon is 0.3% of the solution mass, and after stirring for 20 minutes, the solution enters the filter tank 4.

[0072] The filter 4 is divided into upper and lower layers, with a partition in the middle, and the partition has circular holes with a porosity of 75%. The filter cloth is covered above the partition, the solution enters through the upper part of the filter, and the activated car...

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Abstract

The invention belongs to the technical field of treatment of industrial mixed sulfates, and particularly relates to a process and device for treating byproduct mixed waste salts containing sodium sulfite and sodium sulfate produced during phenol production. The process includes preparing the byproduct mixed waste salts during phenol production into a homogeneous solution by utilizing water, adjusting the pH value of the solution to 4-6 by utilizing sulfuric acid, adding activated carbon into the solution, performing adsorption, performing ultrasonic comprehensive oxidation after adsorption to promote oxidation of the sodium sulfate in the solution and decomposition of organic matters until the COD of the solution is less than 10 mg / L, subjecting the solution to ultrasonic crystallization to precipitate sodium sulfate crystals, and utilizing the solution repeatedly. The technical device includes an adsorption pretreatment unit, an ultrasonic oxidation unit and an ultrasonic crystallization unit. The process and the device have characteristics of novel process steps, a reasonable structure design of the device, unique treatment manners, high recovered salt purity, good appearance of the recovered salt, and the like, overcome the treatment problem of mixed waste salts and achieve zero-emission of waste water.

Description

technical field [0001] The invention belongs to the technical field of industrial mixed sulfate treatment, and in particular relates to a process and a device for treating waste salt mixed with sodium sulfite and sodium sulfate as a by-product in the phenol production process. Background technique [0002] Phenol is an important organic chemical raw material widely used in the fine chemical industry. At present, the main methods of synthesizing phenol include sulfonated alkali fusion method, cumene method, chlorobenzene hydrolysis method, crude phenol refining method, benzene oxidation method, etc. Among them, the sulfonated alkali fusion method is the most widely used. [0003] A large amount of mixed salt of sodium sulfite and sodium sulfate is produced in the process of producing phenol by sulfonation alkali fusion method, which contains benzene, phenol and other organic pollutants, because sodium sulfite and sodium sulfate have similar physical properties and cannot be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/04C01D5/16
CPCC01D5/04C01D5/16C01P2006/80
Inventor 孙宇明张源刘艳李鹏宋红
Owner SHENYANG RES INST OF CHEM IND
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