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Novel process for recovering PTA (purified terephthalic acid) wastewater

A technology of resource utilization and new process, which is applied in the new process field of PTA wastewater recycling and utilization, can solve the problems of limited energy saving in the separation of acetic acid wastewater, and achieve the effects of reducing energy consumption, reducing heat load and high resource recovery rate.

Active Publication Date: 2015-11-11
FUZHOU UNIV
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Problems solved by technology

However, the split treatment of acetic acid wastewater makes the energy saving of separation of acetic acid wastewater limited

Method used

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  • Novel process for recovering PTA (purified terephthalic acid) wastewater
  • Novel process for recovering PTA (purified terephthalic acid) wastewater
  • Novel process for recovering PTA (purified terephthalic acid) wastewater

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Embodiment 1

[0036] The treatment capacity of refined wastewater is 10t / hr (including TA3215ppm, BA245ppm, PT acid 755ppm, 4-CBA15.5ppm), and the treatment capacity of acetic acid wastewater is 15t / hr (containing 55% acetic acid). The aromatic compound extraction tower (first-stage extraction tower) is a plate-type extraction tower with a theoretical plate number of 8, and the feed volume ratio of PX to refined wastewater is 1:8. The PX extraction tower (second-stage extraction tower) is a packed extraction tower with 7 theoretical plates, and the feed volume ratio of solvent sec-butyl acetate (SBA) to refined wastewater is 1:1. The acetic acid extraction tower (the third-stage extraction tower) is a packed extraction tower, the height of which is equivalent to 10 theoretical plates, and the feed volume ratio of acetic acid wastewater to solvent is 0.6:1. The azeotropic distillation column adopts plate type and packing structure, and the number of theoretical plates is equivalent to 50. A...

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Abstract

The invention a novel process for recovering PTA (purified terephthalic acid) wastewater (including refinement wastewater and acetic acid wastewater), which comprises the following steps: (1) extracting and recovering polybasic organic acids in refinement wastewater by using paraxylene; (2) extracting the trace paraxylene dissolved in the refinement wastewater by using a solvent, and deeply extracting and recovering residual organic acids in the refinement wastewater; (3) by using the extract phase in the step (2) as the solvent, recovering acetic acid in acetic acid wastewater by an extraction+azeotropy rectification technique; and (4) recovering reclaimed water by ultrafiltration+reverse osmosis. The process recovers most organic matters in the wastewater, achieves the goal of recovering wastes, and avoids waste of resources. By organically combining the double-extraction processes, extraction+azeotropy rectification process and membrane system, the process can simultaneously treat the PTA refinement wastewater and acetic acid wastewater, achieves the goal of deeply recovering organic acids in the PTA wastewater, obviously lowers the energy consumption of the azeotropy rectification tower and solvent dehydration tower, implements recovery of reclaimed water, and has the advantages of low energy consumption, high resource recovery rate, simple procedure and the like.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a new process for resource recovery and utilization of PTA waste water. Background technique [0002] Purified terephthalic acid (PTA) is one of the important basic organic chemical raw materials, mainly used in the production of polyester fiber, polyester film and so on. The production of PTA generally uses p-xylene as raw material, cobalt and manganese as catalysts, and air oxidation in acetic acid medium to generate crude terephthalic acid (CTA). The oxidation reaction of p-xylene is an exothermic reaction, and the heat needs to be taken away by the evaporation of the acetic acid solution and the water generated by the reaction. Therefore, in the oxidation system, the atmospheric pressure absorption tower, high pressure absorption tower, reactor condenser, oxidation first crystallizer and solvent stripping tower will all discharge wastewater containing acetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C51/44C07C51/46C07C63/26C07C63/06C07C65/30C07C63/04
CPCC07C51/44C07C51/46C07C63/26C07C63/06C07C63/04C07C65/30C07C53/08
Inventor 邱挺黄智贤叶长燊王红星李玲杨臣杨金杯陈锦溢
Owner FUZHOU UNIV
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