PTA refining wastewater resource recycling device and method based on electrodialysis

A technology for refining wastewater and electrodialysis, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. It can solve the problem of not being able to fully realize the effective recovery and utilization of benzene carboxylic acid resources, and reduce steam consumption and treatment. The effect of load and prolonging the service life

Inactive Publication Date: 2020-06-30
FUZHOU UNIV
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Problems solved by technology

[0005] The present invention improves the above-mentioned problems, that is, the technical problem to be solved in the present invention is that technical means such as biodegradation, reverse osmosis and p-xylene extraction cannot fully realize the effective recovery and utilization of benzenecarboxylic acid resources in the process of PTA refining wastewater treatment , to achieve high efficiency, practicality and pollution-free

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  • PTA refining wastewater resource recycling device and method based on electrodialysis
  • PTA refining wastewater resource recycling device and method based on electrodialysis
  • PTA refining wastewater resource recycling device and method based on electrodialysis

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[0035] PTA refined wastewater is fed from the upper part of the extraction tower 1 with a flow rate of 1200 kg / hr, and the extractant is fed from the lower part of the extraction tower with 200 kg / hr of p-xylene. The number of theoretical plates of the extraction tower 1 is 8. After extraction, the wastewater discharged from the bottom of the extraction tower contains 215ppm of benzenecarboxylic acid, 0.0788% of acetic acid, 22ppm of p-xylene, Co 2+ Ion 13.0ppm, Mn 2+ Ion 7.02ppm. The waste water coming out from the bottom of the extraction tower 1 enters the stripping tower 3 whose number of theoretical plates is 28 from the top, and its feeding port is at the sixth block position from top to bottom. The steam of 3kg pressure is passed into the tower still of stripping tower 3, and its mass flow rate is 112kg / hr.

[0036] The material extracted from the top of the stripper 3 contains a small amount of water vapor of p-xylene, and after passing through the condenser 4, it b...

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Abstract

The invention provides a PTA refining wastewater resource recycling device and method based on electrodialysis. The method comprises the steps: firstly, pretreating by an extraction method to recovermost organic benzene carboxylic acid in wastewater; then removing the residual extraction agent in the wastewater by using a steam stripping method, finally, recovering acetic acid, residual organic benzene carboxylic acid and cobalt-manganese metal ions in the wastewater by using an electrodialysis method, and using the treated water for pulping of a PTA refining unit, thereby achieving the purpose of recycling reclaimed water. According to the method, electrodialysis, extraction and steam stripping technologies are combined, resource recycling of the PTA refining wastewater is achieved, andthe method has the advantages of being high in recycling rate, simple in process and the like.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a new method and device for resource recycling of purified terephthalic acid (PTA) waste water. Background technique [0002] Purified terephthalic acid (PTA) is an important raw material for the polyester industry. The production process of PTA mainly includes an oxidation section and a refining section. In the oxidation section, acetic acid is generally used as a solvent, p-xylene (PX) is used as a raw material, and cobalt acetate and manganese acetate are used as catalysts to carry out air catalytic oxidation reaction to form crude terephthalic acid (CTA). The tail gas discharged in this process must first pass through the high-pressure absorption tower and the low-pressure absorption tower, and the recovered acetic acid is sent to the acetic acid dehydration tower, and the finally obtained high-concentration acetic acid is returned to the oxidation reactor as...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/20C02F103/38
CPCC02F1/048C02F1/26C02F1/4693C02F9/00C02F2101/20C02F2101/206C02F2103/38C02F2303/18
Inventor 邱挺黄智贤王红星叶长燊尤新强李玲
Owner FUZHOU UNIV
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