Method for separating and recovering phosphonic acid from acetic acid-nitric acid-phosphonic acid waiste liquid

A technology for separation and recovery of phosphoric acid, used in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc., can solve problems such as incomplete compliance, achieve good production efficiency, improve extraction selectivity, and inhibit emulsification Effect

Inactive Publication Date: 2006-06-07
芝田 隼次 +2
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  • Claims
  • Application Information

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Problems solved by technology

[0004] As mentioned above, when the mixed acid waste liquid formed by mixing acetic acid, nitric acid, and phosphoric acid is neutralized and then discharged, since the neutralization process produces salts such as acetate and nitrate in the wastewater, it will inevitably cause serious environmental pollution. From the viewpoint of environmental protection, it cannot be said that this

Method used

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  • Method for separating and recovering phosphonic acid from acetic acid-nitric acid-phosphonic acid waiste liquid
  • Method for separating and recovering phosphonic acid from acetic acid-nitric acid-phosphonic acid waiste liquid

Examples

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Embodiment 1

[0058] According to the separation and recovery method of the embodiment enumerated in the previous item (with reference to figure 1 ), separating and recovering phosphoric acid from mixed acid wastewater containing acetic acid, nitric acid and phosphoric acid. The mixed-acid wastewater used in this embodiment is the mixed-acid wastewater from the liquid crystal manufacturing plant, and is composed as shown in table 1 (certainly, the mixed-acid wastewater produced from the liquid crystal manufacturing plant is not completely such composition, and various factories etc. different places). Detailed conditions such as the flow rate of each part, the number of stages in each process, and comparison are shown in figure 1 middle. In addition, as an extraction solvent, an extraction solvent having a composition of tris(2-ethylhexyl)phosphate (TOP) / kerosene=50 / 50 (volume ratio) was used. As kerosene, "Solvessol 150" (trade name) manufactured by Showa Shell Oil Co., Ltd. was used. ...

Embodiment 2

[0061] Except using the water that contains 2000ppm NaCl as stripping water, others are separated and recovered phosphoric acid from mixed acid wastewater containing acetic acid, nitric acid and phosphoric acid in the same manner as in Example 1. In addition, the flow rate of each part, the number of stages in each process, and the detailed conditions such as comparison are the same as in Example 1 (refer to figure 1 ).

Embodiment 3

[0063] Except using the water that contains 2000ppm KCl as stripping water, other are separated and recovered phosphoric acid from the mixed acid wastewater containing acetic acid, nitric acid and phosphoric acid in the same manner as in Example 1. In addition, detailed conditions such as the flow rate of each part, the number of stages in each process, and comparison are the same as in Example 1 (see figure 1 ).

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Abstract

To provide a method capable of highly efficiently, selectively separating and recovering phosphoric acid from a mixed acid waste liquid containing acetic, nitric and phosphoric acids even in a practical large scale production by suppressing the emulsification of an oil phase with a water phase in a settling state in a separation process to enable the circulating use of an extractant solution sufficiently. The separating/recovering method comprises an extraction process for selectively dissolving acetic and nitric acids in the extractant solution to extract by mixing the waste liquid containing those acids with the extractant solution containing trialkyl phosphate, a recovery process for recovering phosphoric acid from a residual liquid left by the above process, and a separation process for bringing the obtained acetic/nitric acids-containing extractant solution into contact with a salt-containing water for separation to dissolve and transfer their acids into the above water for separation. The extractant solution can circularly be used by feeding back the oil-phase solution obtained from the separation process to the extraction process.

Description

[0001] This application claims the priority of Japanese Patent Application Japanese Patent Application No. 2004-350135 filed on December 2, 2004, and the disclosure thereof constitutes a part of the present application. technical field [0002] The present invention relates to a method for efficiently and selectively separating and recovering phosphoric acid from the acetic acid-nitric acid-phosphoric acid mixed acid waste liquid discharged from the liquid crystal manufacturing process or the semiconductor manufacturing process, etc. A method of recycling the extract by supplying it to the extraction process. Background technique [0003] In the liquid crystal manufacturing and semiconductor manufacturing industries that have developed rapidly in recent years, a variety of waste water flows out during the manufacturing process, but it is discharged after appropriate treatment according to the type and nature of each waste water. For example, mixed acid waste liquid formed by...

Claims

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Application Information

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IPC IPC(8): C01B25/46B01D11/04C02F1/26
CPCB01D11/04C01B25/234C02F1/26C05B7/00
Inventor 芝田隼次山本秀树井上兴一郎小津毅石川香
Owner 芝田 隼次
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