Method and device for recovering bromine element and sodium element from PTA tail gas treatment waste liquid

A tail gas treatment, bromine element technology, applied in the direction of gaseous effluent wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve problems such as loss of high-value materials, achieve reduced sulfuric acid consumption, high economic value , The effect of reducing carbon dioxide emissions

Pending Publication Date: 2022-04-22
南京南环水务科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method and device for reclaiming bromine and sodium elements from PTA tail gas treatment waste liquid, which solves the problem that PTA waste liquid is only dis

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  • Method and device for recovering bromine element and sodium element from PTA tail gas treatment waste liquid
  • Method and device for recovering bromine element and sodium element from PTA tail gas treatment waste liquid
  • Method and device for recovering bromine element and sodium element from PTA tail gas treatment waste liquid

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Embodiment 1

[0034] refer to Figure 1-2 The method for recovering bromine and sodium elements from the PTA tail gas treatment waste liquid provided by the present embodiment includes:

[0035] Step S1: Concentrate the pretreated waste liquid to form a concentrated liquid, so as to remove other impurities and water in the waste liquid, and greatly increase the content of sodium and bromine in the waste liquid, so as to improve the subsequent process efficiency.

[0036]Step S2: adjusting the pH value of the concentrated solution to an alkaline state and evaporating and crystallizing it to obtain sodium carbonate crystals and / or sodium bicarbonate crystals, so that the sodium carbonate crystals and / or sodium bicarbonate crystals are processed under alkaline conditions Fully analyzed, what needs to be explained here is that in the evaporative crystallization process, its treatment temperature can be controlled at 70°C-90°C, and sodium carbonate monohydrate and / or sodium bicarbonate crystals...

Embodiment 2

[0041] refer to Figure 1-2 , On the basis of Example 1, this embodiment further limits the method for recovering bromine and sodium from PTA tail gas treatment waste liquid. Wherein, in step S1, the concentration treatment is electrodialysis treatment, which can properly concentrate the waste liquid, and the electrodialysis treatment includes one-stage concentration electrodialysis and two-stage concentration electrodialysis, which can carry out a greater degree of concentration on the waste liquid. concentrated treatment. The concentrated solution of the first-level concentrated electrodialysis enters the second-level concentrated electrodialysis for treatment, and the desalinated solution of the second-level concentrated electrodialysis is sent back to the first-level concentrated electrodialysis for retreatment, that is, the solute content in the concentrated solution of the first-level concentrated electrodialysis After the secondary concentration electrodialysis treatme...

Embodiment 3

[0044] refer to Figure 1-2 , On the basis of Example 1, this embodiment further limits the method for recovering bromine and sodium from PTA tail gas treatment waste liquid. Wherein, in step S3, before the mother liquor enters the special nanofiltration treatment, step S301 is also included: diluting the mother liquor and adjusting its pH value to an acidic state, so as to convert the carbonate and / or bicarbonate in the mother liquor into carbonic acid , carbonic acid is unstable in water, easily decomposed into water and carbon dioxide, and can decarbonize the acidified mother liquor, so that carbon dioxide can leave the solution and disperse into the atmosphere with the high-speed flowing air, so that the ion balance of carbonate in water Moving in the direction of carbon dioxide generation, the carbonate and / or bicarbonate in the water is removed in the form of carbon dioxide, the chemical equilibrium of which is as follows: The mother liquor dilution after decarburizati...

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Abstract

The invention provides a method and a device for recovering bromine elements and sodium elements from PTA tail gas treatment waste liquid, relates to the technical field of treatment of oxidation waste liquid of terephthalic acid, and solves the problems that in the prior art, the PTA waste liquid is discharged only through sulfuric acid neutralization and biochemical treatment; the loss of high-value materials such as sodium bicarbonate, sodium carbonate and sodium bromide is easily caused. The recovery method comprises the following steps: carrying out concentration treatment on pretreated waste liquid to form a concentrated solution; adjusting the pH value of the concentrated solution to be alkaline, and performing evaporative crystallization on the concentrated solution to obtain sodium carbonate crystals and/or sodium bicarbonate crystals; carrying out special nanofiltration treatment on the evaporated and crystallized mother liquor to obtain a sodium bromide fresh water solution; the sodium bromide fresh water solution is concentrated, a high-concentration sodium bromide solution is obtained, follow-up evaporative crystallization or bromine extraction treatment is facilitated, solute in the waste liquid can be recycled and converted into product salt with high economic value, and the remaining waste liquid is more beneficial to follow-up treatment and discharge.

Description

technical field [0001] The invention relates to the technical field of terephthalic acid oxidation waste liquid treatment, in particular to a method and device for recovering bromine and sodium elements from PTA tail gas treatment waste liquid. Background technique [0002] PTA (terephthalic acid) is an important chemical raw material, and its production process includes two processes of oxidation and refining. In the oxidation process, the raw material PX (p-xylene) is oxidized, acetic acid is used as a solvent, cobalt acetate and manganese acetate are used as catalysts, bromide is used as a cocatalyst, and PTA oxidation tail gas is properly treated to obtain a large amount of sodium bicarbonate and Tail gas treatment waste liquid of sodium carbonate, sodium bromide, sodium acetate, organic matter and other impurities. [0003] At present, this PTA waste liquid cannot be discharged directly because it contains a large amount of pollutants. Instead, it needs to be neutraliz...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/10C01D7/24C02F103/18
CPCC02F9/00C01D3/10C01D3/14C01D7/24C02F1/66C02F1/048C02F1/442C02F1/4693C02F1/441C02F2103/18C01P2006/80
Inventor 樊兆世施明清高帆任景涛王强王会英刘世瑞
Owner 南京南环水务科技有限公司
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