Method for treating diethyl (o-) phthalate waste water and recovering diethyl (o-) phthalate from it

A diethyl phthalate and wastewater technology, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and adsorption water/sewage treatment, can solve the problems of resource waste, ineffective treatment, and threats to human health. Achieve good regeneration performance and realize the effect of resource recycling and reuse

Inactive Publication Date: 2007-03-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment method for diethyl phthalate pollution in water is mainly dilution-biodegradation,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 3mL (about 1 gram) of macroporous adsorption resin NDA-150 into a jacketed glass adsorption column (Φ12×160mm). Wastewater diethyl phthalate is 500mg / L. After filtering, pass it through the resin bed at a flow rate of 15mL / h at 25±5°C, and the treatment capacity is 1650mL / batch. After being adsorbed by the resin, the average concentration of diethyl phthalate in the adsorbed water is less than 1mg / L.

[0019] When the adsorption reaches the leakage point (the immediate concentration of diethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 20mL of methanol is flowed at a flow rate of 6mL / h at a temperature of 40±5°C. Flow through the resin bed for desorption. The methanol solution of the desorbed diethyl phthalate is rectified, the distilled methanol is used as a desorbing agent for the next batch of desorption operations, and the residual diethyl phthalate is recovered as a chemical product.

Embodiment 2

[0021] Put 30mL (about 10g) of NDA-150 resin into a jacketed glass adsorption column (Φ16×180mm). Wastewater diethyl phthalate is 300mg / L. After filtering, pass it through the resin bed at 40±5°C at a flow rate of 450mL / h, and the treatment capacity is 8900mL / batch. After being adsorbed by the resin, the average concentration of diethyl phthalate in the adsorbed water is less than 2mg / L.

[0022] When the adsorption reaches the leakage point (the immediate concentration of diethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 100mL volume percentage of 95% ethanol solution is placed at a temperature of 50±5°C to The flow rate of 150mL / h flows through the resin bed for desorption. The ethanol solution of the desorbed diethyl phthalate is rectified, and the distilled ethanol is used as a desorbing agent for the next batch of desorption operations, and the residual diethyl phthalate is used as a chemical product.

Embodiment 3

[0024] Put 600mL (about 200g) of ND-150 resin into a jacketed glass adsorption column (Φ70×500mm). Wastewater diethyl phthalate is 400mg / L. After filtering, pass it through the resin bed at a flow rate of 6000mL / h at 10±5°C, and the treatment capacity is 300000mL / batch. After being adsorbed by the resin, the average concentration of diethyl phthalate in the effluent is less than 1.5mg / L.

[0025] When the adsorption reaches the leakage point (the immediate concentration of diethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 3000mL of 80% ethanol is placed at a temperature of 60±5°C at a flow rate of 1800mL / h Desorption is performed cocurrently through the resin bed. The ethanol solution of the desorbed diethyl phthalate is rectified, and the distilled ethanol is used as a desorbing agent for the next batch of desorption operations, and the residual diethyl phthalate is used as a chemical product.

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PUM

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Abstract

The invention discloses a method of processing dimethyl phthalate- containing waste water and recovering dimethyl phthalate from the waste water, belonging to the field of processing organic pollutant waste water with macroporous resin, passing the waste water through absorption column equipped with resin and making the dimethyl phthalate absorbed on the resin so as to implement effective separation of organic matter; the effluent water after absorption separation can be directly discharged into municipal pipeline network; the resin is regenerated after eluted with methanol or alcohol; the obtained high-concentration dimethyl phthalate alcohol solution is rectified and the recovered methanol or alcohol acts as desorbing agent for the next desorbing operation, and the remaining dimethyl phthalate can be recovered as resources. And it unites waste water processing and resource recovery from waste.

Description

technical field [0001] The invention relates to the field of treating organic polluted waste water with macroporous resin, more specifically, it relates to a method for separating and recovering diethyl phthalate while treating water polluted by diethyl phthalate. Background technique [0002] Diethyl phthalate (DEP) is a phthalate compound, mainly used as a modification additive for plastics, to increase the plasticity and strength of plastics, and in a small amount for pesticides, paints, printing and dyeing, cosmetics, Production of paints and fragrances. Diethyl phthalate is an environmental hormone with carcinogenicity, mutagenicity, teratogenicity, reproductive toxicity, neurotoxicity, and endocrine disrupting effects. It is also recognized as one of the global priority control toxic pollutants. The pollution of diethyl phthalate in water mainly comes from the discharge of industrial wastewater during the production and use of plasticizers, the discharge of landfill l...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C67/56C02F1/28
Inventor 张炜铭许正文张庆建潘丙才杜伟张庆瑞张全兴陈金龙
Owner NANJING UNIV
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