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Method for resource comprehensive utilization of PTA refining waste water

A technology for refining waste water and recycling, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as difficult high-value utilization, comprehensive utilization of unrefined waste water, limited water quality, etc., to achieve The effect of reducing consumption, reducing COD discharge, and reducing waste water discharge

Active Publication Date: 2014-04-02
浙江化安安全技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The above existing methods have partially solved some technical problems, and have also promoted the technological progress in the recycling of refined wastewater, but these methods either have limited water quality and are difficult to be used with high value, or only recycle the water in the water. A small amount of useful material resources, in short, the current existing methods do not systematically and thoroughly solve the comprehensive utilization of refined wastewater

Method used

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  • Method for resource comprehensive utilization of PTA refining waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This example is carried out on a specially constructed pilot plant for comprehensive utilization of PTA refined wastewater.

[0025] This implementation example includes the following 5 steps:

[0026] Step 1, filter the PTA refined wastewater with a filter to remove suspended solids in the water, the filter medium is a filter cloth, and the filter cloth has a pore size of 10 μm;

[0027] In the second step, the filtered water is sequentially passed through the cation exchanger, the first-stage selective adsorber, the second-stage selective adsorber, and the third-stage selective adsorber to obtain purified water;

[0028] In the third step, after the cation exchanger is saturated, it is analyzed with hydrochloric acid, after the first to third-stage selective adsorbers are saturated, it is analyzed with strong alkali, and the analytical solution of the second and third-stage selective adsorbers is removed to waste water;

[0029]In the 4th step, the hydrochloric acid ...

Embodiment 2

[0038] With the same raw material in Example 1, experiment in a similar manner in Example 1, just extract the slurry that crystallizes out in the 4th step with p-xylene, then filter and fully wash the filter cake with PTA refining waste water, the resulting filter cake It is a terephthalic acid product, the filtrate goes to the decanter to separate into oil and water two phases, the water phase goes to waste water, the oil phase is rich in p-toluic acid, and the mass ratio of p-xylene to slurry is 1:5. In this example, the recovery rate of p-toluic acid in the wastewater is 89%, the recovery rate of terephthalic acid is 92%, and the yield of benzoic acid is 73%. The COD flow rate of all discharged wastewater is reduced by 68% compared with the raw material PTA refined wastewater.

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Abstract

The invention discloses technology for resource comprehensive utilization of PTA refining waste water. PTA refining waste water is subjected to cation exchange and 3-stage selective adsorption in order to obtain purified water; when the cation exchanger and the 3-stage selective adsorber are saturated, desorption is carried out; cobalt and manganese are recovered from desorption liquid of the cation exchanger, and p-toluic acid, terephthalic acid and benzoic acid are recovered from desorption liquid of the first-stage selective adsorber. The purified water obtained by the technology has a yield of 75-85%, has quality approaching desalted water, and can be returned to refining units to substitute desalted water for use; the cobalt recovery rate is 90%, the manganese recovery rate is 75%, the p-toluic acid recovery rate is 85%, the terephthalic acid recovery rate is 90%, the benzoic acid recovery rate is 70%, and all of the above are returned to oxidation units for use. Therefore, the technology of the invention not only reduces the discharge of refining waste water by about 80%, but also greatly reduces the using amount of desalted water, recovers precious metals and useful organic matter, reduces the discharge of COD flow by more than 65%, and realizes waste water resource recycle, and harvest of both economic benefits and environmental protection benefits.

Description

technical field [0001] The invention relates to a resource comprehensive utilization method of PTA refining wastewater, which is from process wastewater discharged from a refining unit of a terephthalic acid production plant. Background technique [0002] Purified Terephthalic Acid (PTA) is the main raw material for the production of polyester fibers and resins. Currently, it is mainly produced by air oxidation of p-Xylene (PX). A large amount of wastewater is discharged during the production of PTA. Generally, 2 to 3 tons of process wastewater will be discharged for every ton of PTA produced. In 2014, the total production capacity of PTA in the country reached more than 34 million tons, and the annual discharge of PTA process wastewater was nearly 100 million tons. These process wastewater came from the oxidation unit and refining unit of the PTA plant. More than 80% of the total waste water. PTA refined wastewater is an acidic wastewater with a COD concentration of 2000-...

Claims

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Application Information

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IPC IPC(8): C02F9/04C07C51/42C07C51/47C07C63/26C07C63/04C07C63/06C22B7/00C22B47/00C22B23/00C02F1/28C02F1/42
Inventor 谢刚王献忠徐海波
Owner 浙江化安安全技术研究院有限公司
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