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Method for treating waste water generated in production of refined terephthalic acid

A technology for purified terephthalic acid and waste water production, which is applied in the fields of water/sewage multi-stage treatment, extraction water/sewage treatment, adsorption water/sewage treatment, etc., which can solve the problems of inability to meet the requirements of recycling and reuse, and save money. and cost, low operating cost, good treatment effect

Active Publication Date: 2007-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The purpose of the present invention is to overcome the shortcomings of the prior art that the PTA production wastewater cannot meet the requirements of recycling, and provide a method for advanced treatment of purified terephthalic acid production wastewater, so that the treated wastewater can be used as process water circulation Reuse, to realize the resource utilization of waste water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This example is used to illustrate the PTA production wastewater treatment and reuse method provided by the present invention.

[0043]Get 2000 grams of waste water (the composition of the waste water is shown in Table 2 below) of the TA refining stage that is filtered to remove solid impurities and join in the separatory funnel of 5000 milliliters, then will contain 100 grams of trioctylamine, 200 grams of n-octanol and 300 grams of kerosene Add the mixed complexing extractant into the separatory funnel, cover the bottle stopper, and shake it in the shaker for 30 minutes at room temperature, so that the two phases reach the extraction equilibrium, then let it stand, take out the water phase, and carry out COD Cr value determination. The measurement results are shown in Table 3 below.

[0044] Weigh 20 grams of dry macroporous adsorption resin (DM301) and fill it into a glass adsorption column with a diameter of 2.3 cm. The filling height is 11.0 cm. 1000 grams of eff...

Embodiment 2

[0047] This example is used to illustrate the PTA production wastewater treatment and reuse method provided by the present invention.

[0048] Get 2000 gram composition and join the waste water identical with embodiment 1 in the separatory funnel of 5000 milliliters, then will contain the complex extractant of 200 gram tributyl phosphate and 200 gram kerosene in the separatory funnel, cover the bottle stopper , at 40°C, shake in a shaker for 10 minutes to make the two phases reach extraction equilibrium, then stand still, take out the water phase, and carry out COD Cr value determination. The measurement results are shown in Table 3 below.

[0049] Weigh 10 grams of dry macroporous adsorption resin (NKA-2) and place it in a 1000 milliliter conical flask, add 2000 grams of the water sample after the above-mentioned complexation extraction, put the conical flask into a shaker and vibrate for 3 hours, separate Resin and water phase, COD of water samples Cr value determination....

Embodiment 3

[0052] This example is used to illustrate the PTA production wastewater treatment and reuse method provided by the present invention.

[0053] According to the method of embodiment 1, 2000 grams of PTA production wastewater are reused, and the difference is that the complexing extractant is 50 grams of trioctylamine, 50 grams of tri(dodecyl)amine, 300 grams of kerosene and 100 grams of iso Octanol, the amount of cation exchange resin is 4.0 grams. The experimental results are shown in Table 3 or Table 4.

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Abstract

The invention discloses a disposing method of manufacturing waste water of fined terephthalic acid, which comprises the following steps: contacting the waste water and complex extractant; making the CODCr in the waste water not less than 2500ml / L through contacting the manufacturing waste water of fined terephthalic acid and complex extractant; recycling the manufacturing waste water as the technical water; realizing the water circulation; possessing good disposing effect and simple technique with wide applying scale for water quality.

Description

technical field [0001] The invention relates to a method for treating industrial wastewater, in particular to a method for treating purified terephthalic acid production wastewater. Background technique [0002] Purified terephthalic acid (PTA) is an important chemical raw material, widely used in the production of various synthetic resins, polyester fibers, plastic films, plasticizers and coatings, and it is expected that in the next 10 years, polyester fibers, Engineering plastics and powder coating resins will become a new consumption growth point in the Chinese market, and their raw materials all come from purified terephthalic acid. [0003] The main production process of terephthalic acid is: in acetic acid medium, cobalt acetate and manganese acetate are used as catalysts, and the raw material p-xylene (PX) is catalytically oxidized to produce crude terephthalic acid (CTA). The by-products p-toluic acid (P-TA) and p-carboxybenzaldehyde (4-CBA) seriously affect the es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/26C02F1/28C02F1/42
Inventor 李本高马欣
Owner CHINA PETROLEUM & CHEM CORP
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