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Treatment of wastewater from production of p-phthalic acid and recoval of resources therewith

A technology for terephthalic acid and wastewater production, which is applied in the direction of adsorbed water/sewage treatment, etc., can solve the problems of difficult biodegradation, waste of resources, high investment in biochemical treatment process and operating costs, and achieves good regeneration performance.

Active Publication Date: 2005-10-12
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this treatment method are: because the benzene series organic matter in the water body is difficult to biodegrade, the investment and operation costs of the biochemical treatment process are relatively high, and at the same time, some products and intermediates in the water body are destroyed into small molecular substances during the treatment process. cause waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 10 mL (about 7.5 g) of macroporous adsorption resin NDA-101 into a jacketed glass adsorption column (Φ16×160 mm). The concentration of benzene series organic matter in wastewater is 900mg / L, COD Cr It is 6000mg / L. After filtering, pass it through the resin bed at a flow rate of 80mL / h at 25±5°C, and the processing capacity is 600mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, in which benzene series organic matter is 47mg / L, COD Cr Reduced to 2200mg / L, COD after conventional aerobic treatment Cr It is 89mg / L.

[0016] Use 5mL of 3.6mol / L aqueous sodium hydroxide solution, 10mL of 1.8mol / L aqueous sodium hydroxide solution, and 20mL of distilled water to pass through the resin bed at a flow rate of 15mL / h at a temperature of 75±5°C for desorption. The desorbed high-concentration benzene-based organic solution is acidified and filtered with sulfuric acid, and the filtered white solid is returned to the original production sec...

Embodiment 2

[0018] Put 100mL (about 75g) of macroporous adsorption resin NDA-101 into a jacketed glass adsorption column (Φ32×260mm). The concentration of benzene series organic matter in wastewater is 850mg / L, COD Cr It is 5800mg / L. After filtering, pass it through the resin bed at a flow rate of 1000mL / h at 5±5°C, and the processing capacity is 8000mL / batch. After being adsorbed by resin, the effluent is colorless and transparent, in which benzene series organic matter is about 45mg / L, COD Cr Reduced to 2450mg / L, COD after conventional aerobic treatment Cr It is 96mg / L.

[0019] Use 50mL 4mol / L sodium hydroxide aqueous solution, 100mL 1mol / L sodium hydroxide aqueous solution, and 200mL distilled water to pass through the resin bed in sequence at a temperature of 65±5°C at a flow rate of 50mL / h for desorption. The desorbed high-concentration benzene-based organic solution is acidified and filtered with sulfuric acid, and the filtered white solid is returned to the original production ...

Embodiment 3

[0021] Put 500mL (about 375 grams) of macroporous adsorption resin NDA-101 into a jacketed glass adsorption column (Φ100×360mm). The concentration of benzene series organic matter in wastewater is about 1250mg / L, COD Cr It is 8100mg / L. After filtering, pass it through the resin bed at a flow rate of 5000mL / h at 15±5°C, and the processing capacity is 20000mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, in which benzene series organic matter is about 48mg / L, COD cr Reduced to 2300mg / L, COD after conventional aerobic treatment Cr It is 92mg / L.

[0022] Use 250mL 3.6mol / L sodium hydroxide aqueous solution, 500mL 2.5mol / L sodium hydroxide aqueous solution, and 500mL distilled water to pass through the resin bed in sequence at a temperature of 75±5°C at a flow rate of 500mL / h for desorption. The desorbed high-concentration benzene-based organic solution is acidified and filtered with sulfuric acid, and the filtered white solid is returned t...

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PUM

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Abstract

Waste water management of terephthalic acid production and its resources recovering method are disclosed. It is carried out by passing waste water through adsorbing column with macroporous adsorbing resin, adsorbing terephthalic acid and intermediate etc. benzene series organics onto resin, eluting recovering resin after adsorbing operation by sodium hydrate aqueous solution, acidizing the adsorbed high-concentration benzene series organics solution, cooling , filtering, returning the filtered white solid to original production section or selling as by-product , and returning filtrating-liquid into cyclic use. The low-concentration desorptive liquid is used for next operation of sodium hydrated aqueous solution. It achieves effective separation and repeating use.

Description

1. Technical field [0001] The invention relates to a method for effectively treating waste water from terephthalic acid production and recycling pollutants in the waste water. 2. Background technology [0002] Terephthalic acid (PTA for short), also known as pine phthalic acid, is a white needle-like crystal or powder, mostly used in the production of polyester, and is an important raw material for polyester fiber, film, and insulating paint. It is also used in medicine and dyes and other product production. [0003] Industrial production mainly adopts the high-temperature liquid-phase oxidation method using p-xylene as raw material. P-xylene uses cobalt acetate-manganese acetate as catalyst and tetrabromoethane as co-catalyst. Oxidation produces terephthalic acid. The above-mentioned production process discharges high-concentration organic wastewater, CODcr is about 4500-8000mg / L, which contains not only a large amount of acetic acid, but also about 1000mg / L of organic ma...

Claims

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Application Information

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IPC IPC(8): C02F1/28
Inventor 张全兴潘丙才郑凯张炜铭刘波刘福强陈金龙
Owner NANJING UNIV
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