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Chelating urea produced from pyromellitic dianhydride process waste residue and production method thereof

A technology of pyromellitic dianhydride and urea, which is applied in the direction of urea compound fertilizer, application, fertilizer mixture, etc., can solve the problem of inability to completely remove the acidity of waste water and certain toxic substances, and the lack of a good treatment method for organic acid waste residue, pollution Problems such as surface and groundwater, to achieve the effect suitable for large-scale promotion, conducive to the realization of industrialization, and effective governance

Inactive Publication Date: 2016-09-21
郭伟 +3
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Problems solved by technology

[0004] According to statistics, the above-mentioned by-products produced in the annual production of domestic homogenizing anhydride plants are calculated in thousands of tons. These by-products are generally not treated and utilized, but simply concentrated and buried. This will not only pollute the surface and groundwater, but also will seriously harm and destroy the ecological balance
[0005] As another important discharge from the production of homoanhydride, it is a large amount of high-concentration organic acid wastewater produced during the production process of reaction tail gas washing and hydrolysis of homoanhydride to produce pyromellitic acid. At present, it is diluted and directly enters the biochemical pool for treatment. This not only High treatment costs, waste of resources, and it is impossible to guarantee complete removal of acid and some toxic substances in wastewater
In the prior art, it is also reported that the process of "oil separation-catalytic oxidation-neutralization-coagulation-UFB anaerobic-combined biological contact oxidation process-air flotation" is used for the treatment of wastewater in the production of homoanhydride, in which the Fenton reagent is used to catalyze the oxidation Pretreatment can reduce the COD index of wastewater, significantly improve its biodegradability, and contribute to subsequent biochemical treatment, but the method for pretreatment of homogeneous anhydride wastewater by Fenton reagent needs to go through many steps, and the process is complicated to make wastewater To meet the emission standards, the cost of wastewater treatment is relatively high
[0006] At present, there is no good treatment method for the organic acid waste slag discharged in the process of producing pyromellitic dianhydride (homellitic anhydride), so how to make more reasonable use of the organic acid waste slag discharged in the production process of pyromellitic dianhydride, to explore and Broadening the application of organic acid waste residues and truly turning waste into treasure is a major problem in the field of chemical environmental protection

Method used

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  • Chelating urea produced from pyromellitic dianhydride process waste residue and production method thereof
  • Chelating urea produced from pyromellitic dianhydride process waste residue and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027]Add 210Kg of water, 160Kg of urea and 85Kg of organic acid waste residue into the reactor, start stirring and heat to 90-95°C, then add 64Kg of diammonium phosphate, and react for 1 hour. It can be observed that the organic acid waste residue is basically dissolved. The reaction mass was filtered to obtain 500Kg of chelated urea liquid product.

[0028] Cool the obtained chelated urea liquid product to room temperature (18-25° C.), and use a hydrometer to test that the specific gravity of the liquid is about 1300 g / L.

[0029] This chelated urea liquid product contains N 17.46% (226.98g / L), contains P 2 o 5 6.9% (89.7g / L) (g / L), organic matter 17% (221.0g / L); the solid product of chelated urea was obtained after drying the liquid product, which contained 28% N and P 2 o 5 11%, containing 28% organic matter.

Embodiment 2

[0031] Add 100Kg of water, 80kg of solid potassium hydroxide with a purity of 92%, and 84Kg of organic acid waste residue into the reactor, mix and stir until the pH value is about 7, and obtain 250Kg of an aqueous solution containing organic potassium. K 2 O content is 24.8%, containing 34.29% organic matter;

[0032] Add the chelated urea liquid product 250Kg of embodiment 1, mix and stir, obtain 500Kg organic potassium water-soluble fertilizer.

[0033] The obtained water-soluble fertilizer liquid is tested by a hydrometer at room temperature (18-25° C.), and the specific gravity of the liquid is about 1300 g / L.

[0034] The organic potassium water-soluble fertilizer contains 25.6% (332.8g / L) of organic matter; the content of macroelements is 24.58% (319.5g / L), and the specific macroelements contain 8.73% (113.5g / L) of N, P 2 o 5 3.45% (44.85g / L), K 2 O12.4% (161.2g / L), consistent with the requirements of the agricultural industry standard NY 1106-2010 "Water-Soluble F...

Embodiment 3

[0036] Add 150Kg of water, 90Kg of solid potassium hydroxide with a purity of 92%, and 92.5Kg of organic acid waste residue in the reactor, and mix and stir the uniform pH value to about 7 to obtain an aqueous solution containing organic potassium; 45.1Kg of organic acid waste residue, urea 95Kg and 37Kg of diammonium phosphate, heated at 90-95°C for about 1.5 hours, it can be observed that the organic acid waste residue is basically dissolved, and the reaction material is filtered to obtain a chelated urea liquid product; the aqueous solution containing organic potassium obtained above and The chelated urea liquid product is mixed to obtain 500Kg of organic potassium water-soluble fertilizer.

[0037] Or use a workaround:

[0038] Add 150Kg of water, 90Kg of solid potassium hydroxide with a purity of 92%, and 92.5Kg of organic acid waste residue into the reactor. After mixing and stirring, the pH value is about 7, and then add 45.1Kg of organic acid waste residue, 95Kg of ure...

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Abstract

The invention provides chelating urea produced from a pyromellitic dianhydride process waste residue and a production method thereof. The chelating urea is obtained by carrying out a reaction of an organic acid waste residue for producing pyromellitic dianhydride and urea under the action of a phosphate catalyst, wherein the organic matter content is more than or equal to 200 g / L, and the sum of the mass of N and P2O5 is more than or equal to 200 g / L. The invention also provides an organic potassium water soluble fertilizer which can be prepared by mixing an organic potassium-containing aqueous solution and the chelating urea and also can be prepared by carrying out a reaction of an organic potassium-containing aqueous solution, the organic acid waste residue for producing pyromellitic dianhydride and urea under the action of a phosphate catalyst. With use of the organic acid waste residue for producing pyromellitic dianhydride as the raw material, and based on providing of the chelating urea, the excellent organic potassium aqueous fertilizer is also obtained, harmless and zero emissions treatment of the organic acid waste residue are achieved, and more comprehensive utilization of resources is achieved.

Description

technical field [0001] The invention relates to a chelated urea and a production method produced by utilizing the waste residue of a pyromellitic dianhydride process, belonging to the field of chemical environmental protection. Background technique [0002] Pyromellitic dianhydride (homellitic anhydride) is an organic chemical intermediate, which is used as a raw material to produce engineering plastics, coating additives, plastic additives, adhesives, etc., especially as a raw material for polyimide production , the prepared polyimide film, polyimide resin and other products are widely used in electromechanical, electronic, aviation and many other fields because of their excellent electrical insulation, high and low temperature resistance, mechanical and other properties. [0003] Due to the high melting point of pyromellitic dianhydride, there are many side reactions in the preparation process, and the discharge includes waste acid water and waste residue. The industrial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G1/00
CPCC05C9/00C05D1/00
Inventor 郭伟唐澄汉赵云建郭东
Owner 郭伟
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