Method for treating TDA wastewater through complexing extraction

A technology for extraction and wastewater, applied in the direction of extraction water/sewage treatment, natural water treatment, chemical instruments and methods, etc., can solve the problem of high cost of oxidation treatment, achieve the effect of low treatment cost, simple and reasonable process, and wide application prospects

Active Publication Date: 2014-07-16
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of oxidation treatment for wastewater containing high concentrations of TDA is relatively high

Method used

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  • Method for treating TDA wastewater through complexing extraction

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a kind of method adopting complex extraction to process TDA waste water, its steps are as follows:

[0020] (1) pH value adjustment: adjust the pH value of TDA wastewater to 7 with inorganic acid;

[0021] (2) Extraction: The volume ratio of the extraction agent and the waste water is 4:1, stirring and mixing at a temperature of 0-10°C for 5-60 minutes, standing for 20-120 minutes to separate layers, the upper layer is the loaded extraction agent, and the lower layer is the extraction treatment waste water;

[0022] The extractant used in the extraction includes a complexing agent selected from 2-ethylhexylphosphonic acid-2-ethylhexyl ester, di(2,4,4-trimethylpentyl)phosphonic acid one or both of them.

Embodiment 2

[0023] Embodiment 2, a kind of method adopting complex extraction to process TDA waste water, its steps are as follows:

[0024] (1) pH value adjustment: adjust the pH value of TDA wastewater to 10 with inorganic acid;

[0025] (2) Extraction: The volume ratio of extractant and waste water is 1:8, stirring and mixing at a temperature of 10-20°C for 5-60 minutes, and standing for 20-120 minutes to separate layers. The upper layer is the loaded extractant, and the lower layer is the extracted waste. waste water;

[0026] The extraction agent used in the extraction includes a complexing agent, and then add one of the cosolvent and the diluent, and mix according to the required ratio; the complexing agent is selected from 2-ethylhexylphosphonic acid-2-ethyl one or both of hexyl ester and di(2,4,4-trimethylpentyl)phosphonic acid; Kind; Described diluent is selected from kerosene or cyclohexane.

Embodiment 3

[0027] Embodiment 3, a kind of method adopting complex extraction to process TDA waste water, its steps are as follows:

[0028] (1) pH value adjustment: Use mineral acid to adjust the pH value of TDA wastewater to 8-9;

[0029] (2) Extraction: The volume ratio of the extraction agent and the waste water is 4:1~1:8, stirring and mixing at a temperature of 20~30°C for 5~60 minutes, and standing for 20~120 minutes to separate layers. The upper layer is the loaded extraction agent, and the lower layer is Wastewater after extraction treatment;

[0030] The extraction agent used in the extraction includes a complexing agent, then add a cosolvent, a diluent, and mix according to the required ratio; the complexing agent is selected from 2-ethylhexylphosphonic acid-2-ethylhexyl ester, di One or two of (2,4,4-trimethylpentyl)phosphonic acid; the co-solvent is selected from one or more of n-octanol, isooctyl alcohol, and sec-octanol; the The diluent is selected from kerosene or cycloh...

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Abstract

The invention discloses a method for treating 2,4-diaminotoluene (TDA) wastewater through complexing extraction. The method is characterized by mainly comprising the steps of pH value adjustment, extraction and an extraction agent recycling treatment process. The method adopts one or two of 2-ethylhexyl 2-ethylhexyl phosphonate, di(2,4,4-trimethyl amyl) phosphonic acid as a complexing agent, one or more of n-octyl alcohol, isooctanol and sec-octyl alcohol as a cosolvent, and kerosene or cyclohexane as a diluent for preparing a complexing exaction agent for separating TDA compounds which are hard to be biochemically treated in the wastewater, and the extraction agent is regenerated by using inorganic acid and is subsequently repeatedly used. The method is simple and reasonable in process, high in operability, convenient to operate and low in treatment cost. The TDA concentration of the wastewater treated by using the process is greatly reduced, the primary extraction removal rate of TDA is 95-99%, and a wide application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for treating TDA wastewater by complex extraction. Background technique [0002] The chemical name of TDA is 2,4-diaminotoluene. It is a light yellow solid at room temperature. It will turn dark purple or black when stored for a long time or exposed to air, and has an ammonia smell. TDA is mainly used as a raw material for the synthesis of toluene diisocyanate (TDI) and as a polyether initiator. It can also be used as an epoxy resin curing agent and a dye intermediate. At the same time, it can also synthesize aromatic diamine curing agents for polyurethane elastomers and epoxy resins, such as dimethylthiotoluenediamine DMTDA and diethyltoluenediamine DETDA. [0003] TDA wastewater is a toxic organic pollutant wastewater that is difficult to degrade. Due to its strong toxicity, it is difficult to achieve satisfactory removal effect with conventional processes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/26C02F103/36
Inventor 杨志林董自斌赵焰王开春李学字刘娟王克云
Owner BLUESTAR LEHIGH ENG INST CO LTD
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