Recovery method and recovery system for PTA refined mother liquor

A mother liquor recovery and mother liquor technology, applied in chemical instruments and methods, neutralized water/sewage treatment, separation/purification of carboxylic acid compounds, etc., can solve the problems of high investment, large amount of ion exchange resin, large amount of solid waste, etc. , to achieve the effect of reducing investment and operating costs, increasing ion concentration, and reducing total emissions

Pending Publication Date: 2020-02-21
SHANGHAI KAIXIN ISOLATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101254985A adopts membrane and ion exchange combination to reuse TA, p-TA, Co, Mn catalysts and water, but adds a large number of heat exchangers, which occupies a large area and consumes a lot of energy. Large consumption and regenerated waste liquid, high investment, and large amount of solid waste in the later stage

Method used

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  • Recovery method and recovery system for PTA refined mother liquor
  • Recovery method and recovery system for PTA refined mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The temperature of the refined mother liquor drops to 80°C after flash evaporation. At this time, the pH in the mother liquor is 3, the content of TA is 50ppm, the content of PT acid is 60ppm, the content of acetic acid is 2000ppm, the content of cobalt ion is 2ppm, the content of manganese ion is 3ppm, and the content of iron ion is 0.5ppm. The sodium ion content is 10ppm, add NaOH to adjust the pH to 3.3, pump it into the ultrafiltration system, and use a circulating pump to circulate it to filter and concentrate, and the concentrated liquid is discharged to the concentrated liquid tank with stirring for recycling.

[0077] The filtrate of the ultrafiltration system enters the ultrafiltration filtrate tank, and then is pumped into the A set of reverse osmosis water recovery system. The ultrafiltration filtrate is intercepted and concentrated by a set of reverse osmosis (RO). The amount of filtrate passing through the reverse osmosis membrane is about 4 / 5 of the influen...

Embodiment 2

[0081] The temperature of the refined PTA mother liquor drops to 80°C after flash evaporation. At this time, the concentration of PT acid in the mother liquor is 50ppm, the content of TA is 20ppm, the content of acetic acid is 2500ppm, the content of cobalt ion is 4ppm, the content of manganese ion is 5ppm, the content of iron ion is less than 0.5ppm, and the content of nickel is less than 0.5ppm. The ion content is less than 0.1ppm, and the sodium ion content is 20ppm. Add NaOH to adjust the pH to 4.5, and after the heat exchange of the heat exchange system, the temperature is about 45°C. It is pumped into the ultrafiltration system, and it is circulated and concentrated by a circulating pump. The concentrate is discharged to the concentrate tank with agitation.

[0082] The filtrate of the ultrafiltration system enters the ultrafiltration filtrate tank, and then is pumped into the A set of reverse osmosis water recovery system. The ultrafiltration filtrate is intercepted and...

Embodiment 3

[0086] The content of cobalt ion in PTA refined mother liquor is 6ppm, the content of manganese ion is 5ppm, the content of iron ion is less than 0.5ppm, and the content of sodium ion is 50ppm. After exchanging heat between liquid and cold water, the temperature drops to about 45°C, and then it is pumped into the stainless steel membrane ultrafiltration system, and the circulation pump is used to circulate, filter and concentrate, and the concentrated liquid is discharged to the concentrated liquid tank with stirring for recycling.

[0087] The filtrate of the ultrafiltration system enters the ultrafiltration filtrate tank, and then is pumped into the A set of reverse osmosis water recovery system. The ultrafiltration filtrate is intercepted and concentrated by A set of reverse osmosis (RO), the amount of filtrate passing through the A set of reverse osmosis membrane is about 3 / 4 of the influent volume, the TA content in the filtrate is less than 5ppm, and the cobalt ion conten...

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Abstract

The invention relates to a recovery method and a recovery system for PTA refined mother liquor, and belongs to the technical field of water treatment and resource recycling. An alkali is added into the PTA refined mother liquor and then the mother liquor is fed into an ultrafiltration system; ultrafiltration is carried out, and an ultrafiltration concentrated solution and an ultrafiltration filtrate are obtained; the ultrafiltration filtrate is fed into a reverse osmosis system A; wherein the filtrate of the reverse osmosis system A is produced water, and reuse is performed; a concentrated solution of the reverse osmosis system A enters an ion exchange system for adsorption of cobalt and manganese ions and other metal ions; effluent obtained after ion exchange separation enters a nanofiltration system, nanofiltration filtrate enters a reverse osmosis system B or an electrodialysis system, a main component in a concentrated solution of the reverse osmosis system B or a concentrated chamber of the electrodialysis system is acetic acid and can be recycled, and filtrate of the reverse osmosis system B and water in a light chamber of the electrodialysis system can be recycled. Comparedwith the prior art, the method has the advantages that various effective components and heat energy in the PTA refined mother liquor can be efficiently recovered and utilized, the discharge amount ofpollutants is reduced, and the PTA production cost and the wastewater treatment difficulty are reduced.

Description

technical field [0001] The invention belongs to the technical field of water treatment and resource recycling, and in particular relates to a recovery method and recovery system for PTA refined mother liquor. Background technique [0002] Purified terephthalic acid (also known as 1,4-benzenedicarboxylic acid, the English name is Purified Tethalic Acid, referred to as PTA), and p-xylene (p-Xylene, referred to as PX) is used as raw material in industry, and it is oxidized in liquid phase to form crude Terephthalic acid (CTA) is obtained by hydrogenation refining, crystallization, separation and drying. Purified terephthalic acid (PTA) is the main raw material for the production of polyester fibers and resins. [0003] PTA refining mother liquor is the waste liquid produced in the refining unit during the PTA production process. The refining unit uses water as a solvent to dissolve the crude terephthalic acid (CTA) after beating and heating into the refining reactor. Hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C07C51/42C07C51/47C07C63/26C07C53/08C02F101/20C02F101/34
CPCC02F1/42C02F1/441C02F1/442C02F1/444C02F1/4693C02F1/66C02F9/00C02F2101/20C02F2101/206C02F2101/34C07C51/42C07C51/47C07C53/08C07C63/26
Inventor 葛文越邵蔚张承慈程新燕杨俞王淑影
Owner SHANGHAI KAIXIN ISOLATION TECH CO LTD
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