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Method for comprehensively utilizing PTA (pure terephthalic acid) wastewater containing solid particles

A suspension in water, solid-phase extraction column technology, applied in chemical instruments and methods, natural water treatment, water/sewage multi-stage treatment, etc., can solve the problems of increased operating costs, large floor space, hidden safety hazards, etc., to achieve Zero pollution discharge, saving operating cost, and low operating cost

Inactive Publication Date: 2011-11-23
李大伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical and chemical methods mainly include acid crystallization, precipitation, oxidation, membrane separation, etc., but the precipitation of terephthalic acid (TA) in the crystallization method is not thorough, and the precipitated crystals are not easy to filter, and the technical requirements for solid-liquid separation are high. The price of the coagulant is high, which increases the operating cost, and after treatment, it must be neutralized with a large amount of pure water. Although the oxidation method can completely remove the TA pollutants, there are certain safety hazards in the operation under high temperature and high pressure, and the practical value is not good. high
Chinese patent CN101941769A has provided a kind of flocculation process PTA waste water process, and this process utilizes physicochemical method to process PTA waste water earlier, and TA removal rate can reach 72%, chemical oxygen demand (COD) removal rate can reach 59%, but The treatment effect is not as good as the traditional biochemical method, so it has no practical significance
Chinese patent CN1315295A adopts membrane separation and resin adsorption combined process to treat PTA production wastewater, COD is reduced to 150ppm, benzoic acid and terephthalic acid are reduced to 5ppm, this technology handles the organic substance in PTA mother solid water well, but does not have The metal ions in the water are treated, and the effluent still cannot meet the reuse standard
[0004] Biochemical method is a traditional sewage treatment method, which has many incomparable advantages compared to other methods, but the defect of too large area has begun to limit its further development. Patent CN 1927745A combines oxidation technology with biological method to treat PTA wastewater, realizing In order to achieve short residence time, high treatment efficiency and no pollution discharge, but the process requires an aeration process and still occupies a large area

Method used

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  • Method for comprehensively utilizing PTA (pure terephthalic acid) wastewater containing solid particles
  • Method for comprehensively utilizing PTA (pure terephthalic acid) wastewater containing solid particles
  • Method for comprehensively utilizing PTA (pure terephthalic acid) wastewater containing solid particles

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Experimental program
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Effect test

Embodiment 1

[0023] See the process flow figure 1 , first cool down the PTA solid water to 40°C, and then transport the cooled PTA solid water to the filter with a filter precision of 0.2 μm. A dense filter cake layer is formed, the clear liquid passes through the filter element, and the permeate enters the solid-phase extraction column. When the permeate passes through the solid-extraction agent styrene-based macroporous resin bed, the dissolved organic matter in the water is intercepted by the solid-extraction agent, and the metal ions Still retained in the water, after solid extraction, the effluent flows into the three-stage ion exchange resin. When the wastewater passes through the ion exchange resin bed, the metal ions in the water are graded and exchanged. The primary ion exchange resin, styrene-based cation exchange resin, is used to remove Fe, Ni, Cr and other trace metal ions, secondary ion exchange resin acrylic cation exchange resin is used to recover valuable metal ions such a...

Embodiment 2

[0025] Cool down the PTA solid water to 45°C, and transport the cooled PTA solid water to the filter. The filter precision is 0.2 μm, and the filtering method is external filtration. The dense filter cake layer, the clear liquid passes through the filter element, and the permeate enters the solid phase extraction column. When the permeate passes through the solid extraction agent divinylbenzene macroporous resin bed, the dissolved organic matter in the water is intercepted by the solid extraction agent, and the metal ions It remains in the water, and after solid extraction, the effluent flows into the three-stage ion exchange resin. When the wastewater passes through the ion exchange resin bed, the metal ions in the water are graded and exchanged. The first-stage ion exchange resin acrylic cation exchange resin is used to remove Fe, Ni , Cr and other trace metal ions, the secondary ion exchange resin phenolic cation exchange resin is used to recover valuable metal ions such as ...

Embodiment 3

[0028] Cool down the PTA solid water to 50°C, and transport the cooled PTA solid water to the filter through the pump. The filter precision is 0.2μm, and the filtering method is external filtration. The suspended particles in the water are filtered by the filter element in the external filter filter. Intercept to form a dense filter cake layer, the clear liquid passes through the filter element, and the permeate enters the solid phase extraction column. When the permeate passes through the polyacrylic macroporous resin bed of the solid extraction agent, the dissolved organic matter in the water is intercepted by the solid extraction agent. The metal ions still remain in the water. After solid extraction, the effluent flows into the three-stage ion exchange resin. When the wastewater passes through the ion exchange resin bed, the metal ions in the water are graded and exchanged. The primary ion exchange resin is a phenolic cation exchange resin used to remove Fe. , Ni, Cr and ot...

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Abstract

The invention belongs to the technical field of environmental engineering and industrial wastewater reuse, disclosing a method for comprehensively utilizing PTA (pure terephthalic acid) wastewater containing solid particles. The method comprises the following steps: cooling the PTA wastewater containing solid particles to 40-50DEG C; transmitting the wastewater containing solid particles into a filter; trapping suspended particles in water by the filter to form a compact filter cake layer; causing a clear liquid to pass through the filter core to form a penetrating fluid; then entering a solid-phase extraction column; and causing the effluent to flow through ion exchange resins to achieve the water quality for PTA production-purpose water. The method disclosed by the invention is simple to operate, has the advantages of small land occupation and low operation cost and has an important realistic meaning for comprehensive treatment for PTA production enterprise sewage.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and industrial waste water reuse, and in particular relates to a method for comprehensively utilizing PTA mother solidified water. Background technique [0002] The production process of purified terephthalic acid (PTA) will produce a large amount of high-concentration organic wastewater. This wastewater has the characteristics of large changes in water quality and quantity, high concentration of pollutants, many types of pollutants, and a wide range of pH value fluctuations. It is difficult to treat. One of the petrochemical wastewater, if it is directly discharged into the natural environment, it will cause damage to the aquatic ecology and must be treated. [0003] The treatment methods of PTA wastewater mainly include physical chemical method and biochemical method. Among them, the physical and chemical methods mainly include acid crystallization, precipitation, oxidation, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36
Inventor 陈越峰邓宁李艳芬
Owner 李大伟
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