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Method of separating complexing-form DTPA (diethylenetriamine pentaacetic acid) and hardness ions by electrodialysis process

A technology of hardness ions and electrodialysis, applied in separation methods, electrodialysis, and separation of dispersed particles, can solve the problems of difficult industrial application, difficult separation, high cost, etc., achieve good industrial application prospects, simple operation, and reduce waste water discharge Effect

Active Publication Date: 2015-01-28
SHANDONG AMS ENVIRONMENTAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the water treatment industry, the chelating agent DTPA is often used to inhibit the scaling of hardness ions in water, and the separation of the complexed DTPA and hardness ions is a difficult problem. The common method in chemistry is to use organic solvent extraction, but this method is costly. High, not easy for industrial application

Method used

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  • Method of separating complexing-form DTPA (diethylenetriamine pentaacetic acid) and hardness ions by electrodialysis process
  • Method of separating complexing-form DTPA (diethylenetriamine pentaacetic acid) and hardness ions by electrodialysis process
  • Method of separating complexing-form DTPA (diethylenetriamine pentaacetic acid) and hardness ions by electrodialysis process

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Embodiment 1

[0022] Adopt the electrodialysis device that two electrodialysis units are installed, fill the Na of 1mol / L in the anode chamber 2 and the cathode chamber 12 of the electrodialysis device 2 SO 4 Solution, the circulating liquid inlet flow rate is 30L / h; the acid chamber 10 of the electrodialysis device is filled with 3-10wt% hydrochloric acid solution, and the acid chamber closest to the anode chamber is filled with 3-10wt% sulfuric acid solution, and the circulating liquid inlet flow rate is 10L / h; fill the salt chamber 8 of the electrodialysis device with 3~5wt% CaCl 2 solution, wherein the salt chamber closest to the cathode chamber is filled with 3-10wt% sodium chloride solution, and the circulating liquid inlet flow rate is 15L / h; Wastewater, the concentration of hardness ions in wastewater is within 500mg / L, the pH value is 7-8, and the flow rate of the circulating liquid is 12L / h; then start the DC power supply, and the current density is 100A / m 2 At this time, the hy...

Embodiment 2

[0024] Adopt the electrodialysis device that six electrodialysis units are installed, fill the Na of 1mol / L in the anode chamber 2 and the cathode chamber 12 of the electrodialysis device 2 SO 4 Solution, the circulating liquid inlet flow rate is 30L / h; the acid chamber 10 of the electrodialysis device is filled with 3-10wt% hydrochloric acid solution, and the acid chamber closest to the anode chamber is filled with 3-10wt% sulfuric acid solution, and the circulating liquid inlet flow rate is 10L / h; fill the salt chamber 8 of the electrodialysis device with 3~5wt% CaCl 2 solution, wherein the salt chamber closest to the cathode chamber is filled with 3-10wt% sodium chloride solution, and the circulating liquid inlet flow rate is 15L / h; Wastewater, the hardness ion concentration of the wastewater is within 500mg / L, the pH value is 7-8, and the flow rate of the circulating liquid is 12L / h; then start the DC power supply, and the current density is 150A / m 2 At this time, the hy...

Embodiment 3

[0026] Adopt the electrodialysis device that ten electrodialysis units are installed, fill the Na of 1mol / L in the anode chamber 2 and the cathode chamber 12 of the electrodialysis device 2 SO 4 Solution, the circulating liquid inlet flow rate is 30L / h; the acid chamber 10 of the electrodialysis device is filled with 3-10wt% hydrochloric acid solution, and the acid chamber closest to the anode chamber is filled with 3-10wt% sulfuric acid solution, and the circulating liquid inlet flow rate is 10L / h; fill the salt chamber 8 of the electrodialysis device with 3~5wt% CaCl 2solution, wherein the salt chamber closest to the cathode chamber is filled with 3-10wt% sodium chloride solution, and the circulating liquid inlet flow rate is 15L / h; Wastewater, the concentration of hardness ions in wastewater is within 500mg / L, the pH value is 7-8, and the flow rate of the circulating liquid is 12L / h; then start the DC power supply, and the current density is 200A / m 2 At this time, the hyd...

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Abstract

The invention discloses a method of separating complexing-form DTPA (diethylenetriamine pentaacetic acid) and hardness ions by an electrodialysis process. The method comprises the following steps: firstly, filling a Na2SO4 solution into an anode chamber and a cathode chamber of an electrodialysis device, filling a sulfuric acid solution into an acid chamber, and filling a solution into a salt chamber; then, introducing wastewater containing DTPA and hardness ion complexes into a separating chamber, starting a direct-current power supply, enabling hydrogen ions in the acid chamber to selectively penetrate through a cationic membrane to enter the separating chamber, so that the pH value of the wastewater in the separating chamber is lowered to be lower than 3; enabling the DTPA and the hardness ions to generate dissociation reaction to form a free DTPA anionic group and hardness ions; enabling the hardness ions to continuously penetrate through the cationic membrane selectively to enter the salt chamber and enabling the DTPA anionic groups not to transfer towards the adjacent acid chamber and the salt chamber, and thus realizing the separation of the DTPA and the hardness ions. The method disclosed by the invention can be used for realizing large-scale industrial production, realizing the separation of the DPTA and the hardness ions, reducing the wastewater emission, facilitating the environmental protection, recycling the valuable DTPA solution and realizing the resource utilization purpose.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for separating complexed DTPA and hardness ions by electrodialysis. Background technique [0002] DTPA is a chelating agent or masking agent (English name: Diethylene triamine pentacetate acid; Chinese name: Diethylene triamine pentaacetic acid), DTPA has the ability to complex reaction with hardness ions under alkaline conditions, and occur with hardness ions under acidic conditions. Properties of dissociation reactions. [0003] In the water treatment industry, the chelating agent DTPA is often used to inhibit the scaling of hardness ions in water, and the separation of the complexed DTPA and hardness ions is a difficult problem. The common method in chemistry is to use organic solvent extraction, but this method is costly. High, not easy for industrial application. Contents of the invention [0004] The technical task of the present invention is to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469B01D61/46
CPCB01D61/46C02F1/4693C02F2101/38
Inventor 窦大河
Owner SHANDONG AMS ENVIRONMENTAL
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