Extracting agent and method for treating 4,4-diphenyl ether dianhydride production wastewater by using same

A technology for the production of diphenyl ether dianhydride and waste water, which is applied in the direction of extraction water/sewage treatment, water/sewage treatment, natural water treatment, etc. It can solve the problems of unrecyclable, harmful and hazardous waste raw materials, etc., and reduce the cost of waste water treatment , high economic and environmental benefits, and simple process operation

Active Publication Date: 2022-01-11
HEBEI HAILI FRAGRANCES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the existing methods for treating 4,4'-biphenyl ether dianhydride production wastewater will generate a large amount of hazardous waste and the raw materials cannot be recycled, the present invention provides an extractant and its use to treat 4,4'- The method for producing wastewater from diphenyl ether dianhydride mainly extracts the reaction raw materials and reaction products in the wastewater through the extraction agent composed of esters and halogenated alkanes, and then recovers the reaction raw materials, reaction products, extraction agents and other materials through distillation respectively, and finally After being treated by the sewage treatment system, the drainage meets the discharge standards, realizing the purpose of raw material recycling and clean production, and has high economic and environmental benefits.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The 4,4'-biphenyl ether dianhydride production wastewater in this example is the crystallization mother liquor produced after crystallization and centrifugation in the synthesis process of 4,4'-biphenyl ether dianhydride, which contains 80% water, dimethyl formaldehyde Amide 15%, potassium carbonate 1.5%, 4-nitrophthalimide 2.3%, oxobis-(N-methylphthalimide) 1%, other side reaction products 0.2%.

[0037] The treatment method of 4,4'-biphenyl ether dianhydride production waste water, comprises the steps:

[0038] Step a, add 500g of extractant (isobutyl acetate: dichloromethane: 1,2,4-trichlorobenzene=1:2:0.8) to 1000g of 4,4'-biphenyl ether dianhydride production wastewater, 35°C , Stirring and mixing at 180rpm for 30min, and liquid separation after standing for 1h to obtain 871.5g of the first water phase and 628g of the first oil phase;

[0039] Add 500 g of the above-mentioned extractant to the first water phase, stir and mix for 30 min at 35°C and 180 rpm, and sep...

Embodiment 2

[0045] The 4,4'-biphenyl ether dianhydride production wastewater in this example is the crystallization mother liquor produced after crystallization and centrifugation in the synthesis process of 4,4'-biphenyl ether dianhydride, which contains 80% water, dimethyl formaldehyde Amide 15%, potassium carbonate 1.5%, 4-nitrophthalimide 2.3%, oxobis-(N-methylphthalimide) 1%, other side reaction products 0.2%.

[0046] The treatment method of 4,4'-biphenyl ether dianhydride production waste water, comprises the steps:

[0047] Step a, add 1000g of extractant (isobutyl acetate: dichloromethane: 1,2,4-trichlorobenzene=1:2:0.8) to 1000g of 4,4'-biphenyl ether dianhydride production wastewater, 35°C , 150rpm stirring and mixing for 30min, after standing for 1h, liquid separation was carried out to obtain 867.4g of the first water phase and 1132g of the first oil phase;

[0048] Add 500 g of the above-mentioned extractant to the first water phase, stir and mix for 30 min at 35°C and 150 ...

Embodiment 3

[0052] The 4,4'-biphenyl ether dianhydride production wastewater in this example is the crystallization mother liquor produced after crystallization and centrifugation in the synthesis process of 4,4'-biphenyl ether dianhydride, which contains 80% water, dimethyl formaldehyde Amide 15%, potassium carbonate 1.5%, 4-nitrophthalimide 2.3%, oxobis-(N-methylphthalimide) 1%, other side reaction products 0.2%.

[0053] The treatment method of 4,4'-biphenyl ether dianhydride production waste water, comprises the steps:

[0054] Step a, add 200g of extractant (isobutyl acetate: dichloromethane: 1,2,4-trichlorobenzene=1:2:0.8) to 1000g of 4,4'-biphenyl ether dianhydride production wastewater, 35°C , Stirring and mixing at 180rpm for 30min, and liquid separation after standing for 1h to obtain 897.4g of the first water phase and 302g of the first oil phase;

[0055] Add 200 g of the above-mentioned extractant to the first water phase, stir and mix for 30 min at 35 ° C and 180 rpm, and s...

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Abstract

The invention relates to the technical field of industrial wastewater treatment, and particularly discloses an extracting agent and a method for treating 4,4'-diphenyl ether dianhydride production wastewater by using the extracting agent. The extracting agent comprises an ester compound with 3-6 carbon atoms and halogenated hydrocarbon with 1-6 carbon atoms, and a mass ratio of the ester compound to the halogenated hydrocarbon is 1: (2-4). According to the method, firstly, the extracting agent is adopted for extracting the production wastewater; then the extracting agent, a reaction solvent, reaction raw materials and other substances are recovered from an oil phase obtained through extraction and separation via distillation; the obtained high-purity extracting agent, the reaction solvent, the reaction raw materials and the like can be directly recycled, so wastewater treatment cost is reduced, and the production cost of 4,4'-diphenyl ether dianhydride is reduced; and the method overcomes the problems of serious hazardous waste treatment, incapability of recycling raw materials and resource wasting due to the fact that a large amount of harmful hazardous waste is generated by a direct distillation method and secondary incineration treatment is needed and has high economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to an extractant and a method for treating wastewater produced by 4,4'-biphenyl ether dianhydride using the extractant. Background technique [0002] 4,4'-Biphenyl ether dianhydride is an important intermediate in the production of polyimides, which can be polymerized with various amine compounds to form polyimides. The prepared polyimides are ideal for wearable devices and folding screen mobile phones , folding screen computer and other indispensable materials. In recent years, with the rapid development of popular technologies such as 5G equipment, wearable devices, folding screen mobile phones, and folding screen computers, the demand for polyimide is also increasing. [0003] At present, 4,4'-biphenyl ether dianhydride is made from 4-nitrophthalimide, and 4,4'-biphenyl ether tetracarboxylic acid is obtained through catalytic coupling, hydrolysis, acidifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/26C07D209/48C07C231/24C07C233/03C02F9/14C02F1/04C02F101/34C02F103/36C02F101/38C02F3/30
CPCC02F1/26C02F1/048C07D209/48C07C231/24C02F9/00C02F2101/34C02F2103/36C02F2101/38C02F3/30C07C233/03
Inventor 邵帅李文革张云堂王飞扬王晶晓王晓
Owner HEBEI HAILI FRAGRANCES CO LTD
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