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Method for removing phthalate ester in water body by utilizing solid base catalyst

A solid base catalyst and phthalate ester technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., can solve liquid phase removal, no literature reports, non-recyclable and non-hydrolyzable Products and other problems, to achieve the effect of reducing hazards, good regeneration performance, and realizing resource recovery and reuse

Active Publication Date: 2010-03-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of liquid alkali as a catalyst has disadvantages such as non-recyclability and inability to remove hydrolyzate from the liquid phase.
For the strong basic anion exchange resin as solid base catalyst, the phthalate ester is firstly hydrolyzed into phthalic acid by alkaline catalysis, and then the phthalic acid is adsorbed and removed by the action of acid and alkali, and the phthalate pollutants are reduced at the same time The method of harm has not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 3.2ml (about 1 gram) of D201 resin into a jacketed glass adsorption column (Φ12×160mm). The concentration of dimethyl phthalate in the influent water is 20mg / L. After filtration, it is passed through the resin bed at a flow rate of 24mL / h at 25±5°C, and the treatment capacity is 8000mL / batch. After being adsorbed by the resin, the average concentration of dimethyl phthalate in the effluent water is less than 0.1mg / L.

[0022] When the adsorption reaches the leakage point (the instant concentration of dimethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 40 mL of sodium hydroxide with a concentration of 1% by weight and 10% by weight of concentration are chlorinated The sodium solution is desorbed through the resin bed at a flow rate of 3mL / h at a temperature of 30±5°C. The desorption solution can be reused. When the concentration of sodium hydroxide is lower than 0.5%, the mixed solution is neutralized with hy...

Embodiment 2

[0024] Put 3.4mL (about 1 gram) of D201 resin into a jacketed glass adsorption column (Φ12×160mm). The concentration of dimethyl phthalate in the influent water is 100mg / L. After filtration, it is passed through the resin bed at a flow rate of 20mL / h at 25±5°C, and the treatment capacity is 6851mL / batch. After being adsorbed by the resin, the average concentration of dimethyl phthalate in the effluent water is less than 0.1mg / L.

[0025] When the adsorption reaches the leakage point (the instant concentration of dimethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 40mL of sodium hydroxide containing 1% by weight concentration and 10% by weight concentration of chlorine The sodium chloride solution is desorbed through the resin bed at a flow rate of 3mL / h at a temperature of 30±5°C. The desorption solution can be reused. When the concentration of sodium hydroxide is lower than 0.5%, the mixed solution is neutralized with...

Embodiment 3

[0027] Put 3.4mL (about 1 gram) of D201 resin into a jacketed glass adsorption column (Φ12×160mm). The concentration of dimethyl phthalate in the influent water is 200mg / L. After filtration, it is passed through the resin bed at a flow rate of 18mL / h at 25±5°C, and the treatment capacity is 5700mL / batch. After being adsorbed by the resin, the average concentration of dimethyl phthalate in the effluent water is less than 0.1mg / L.

[0028] When the adsorption reaches the leakage point (the instant concentration of dimethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 40mL of sodium hydroxide containing 1% by weight concentration and 10% by weight concentration of chlorine The sodium chloride solution is desorbed through the resin bed at a flow rate of 3mL / h at a temperature of 30±5°C. The desorption solution can be reused. When the concentration of sodium hydroxide is lower than 0.5%, the mixed solution is neutralized with...

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PUM

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Abstract

The invention discloses a method for removing phthalate ester in a water body by utilizing a solid base catalyst, which belongs to the field of wastewater treatment by resin. The method comprises the following steps of: firstly filtering the water body containing phthalate ester pollutants for removing suspended solids in the water body; then leading the obtained filtrate to pass through an absorption tower which is filled with anion exchange resin containing strong base groups; stopping the absorption when the absorption achieves a leakage point, using mixed solution of sodium hydroxide and sodium chloride for carrying out the desorption, and using sodium hydroxide solution for carrying out the regeneration on the resin after the desorption; and obtaining desorption solution which contains sodium phthalate and can be repeatedly recycled, using hydrochloric acid for neutralizing the desorption solution, and recycling phthalic acid after recrystallization. The method adopts the strong base anion exchange resin as the solid base catalyst, deeply removes the phthalate ester pollutants in the water body by catalytic hydrolysis and acid-base absorption, separates and recycles the phthalic acid while reducing the harm of the phthalate ester pollutants and realizes the recycling and the reutilization of resources, the resin has good regeneration performance and can be used repeatedly.

Description

technical field [0001] The invention relates to a method for removing phthalates in water, more specifically, a method for deeply removing phthalates in water by using a strong basic anion exchange resin as a solid base catalyst and utilizing the synergistic effect of catalytic hydrolysis and acid-base adsorption pollutants, while reducing the harm of phthalate pollutants. Background technique [0002] Phthalate ester compounds, which are mainly used as plastic modification additives, are a class of environmental hormones with carcinogenicity, mutagenicity, teratogenicity, reproductive toxicity, neurotoxicity, and endocrine disruption. They are also recognized as the global priority for controlling toxic pollution. one of the things. The pollution of phthalates in water mainly comes from the discharge of industrial wastewater during the production and use of plasticizers, the discharge of landfill leachate, and the slow release of PVC plastics in the environment. In recent...

Claims

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Application Information

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IPC IPC(8): C02F9/04C07C63/16C07C27/02C07C51/42C02F1/42C02F101/34
Inventor 张炜铭许正文潘丙才吕路张全兴
Owner NANJING UNIV
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