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PTA refined mother liquor reclaiming method and system

A mother liquor recovery and mother liquor technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, natural water treatment, etc., can solve problems such as environmental pollution and incomplete recovery of useful components, and achieve obvious economic benefits, convenient operation and Effects of maintenance, investment reduction and land occupation

Active Publication Date: 2008-09-03
CHINA KUNLUN CONTRACTING & ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these recovery facilities have certain effectiveness, the recovery of useful components is not complete, and a large amount of sewage containing more TA, p-TA and other impurities is still discharged outside the device, causing pollution to the environment

Method used

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  • PTA refined mother liquor reclaiming method and system
  • PTA refined mother liquor reclaiming method and system

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Embodiment Construction

[0034] see figure 1 and FIG. 2 , the specific implementation of the present invention can be based on the above-mentioned technical solutions, and will not be repeated one by one. Only be described as follows in conjunction with technological process with regard to feature of the present invention and main content:

[0035] 1. Technical features:

[0036] The main impurities in the refined mother liquor of the PTA unit are: TA 0.5-1%, p-TA-0.2%, a small amount of HAC, 4CBA, Cat and other metal ions. At present, the traditional treatment process for refining the mother liquor in the PTA device is to first cool the mother liquor to about 50 ° C, so that the dissolved TA and p-TA in the mother liquor crystallize and precipitate to form fine solid particles, and then pass through various filters (such as candle wick, Blade type, sintered metal tube, etc.), using intermittent vertical filtration to recover TA and p-TA. The filtration accuracy of the filter screen is mostly micro...

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Abstract

The invention relates to a PTA device refined mother liquor recovery method and a PTA device refined mother liquor recovery system. The method comprises the steps that refined mother liquor is cooled through a heat exchange method and is processed through an ultrafiltration method, ultrafiltration concentrated liquor is delivered to an ultrafiltration concentrated tank and is delivered to an ion exchange system, Co and Mn ion which can be used as a catalyzer and Fe, Ni , Na and other meallic ion are respectively removed from the liquor, and Co ion elutriant and Mn ion elutriant which can be used as the catalyzer are recycled, the liquor after being treated by ion exchange in a liquor pot is partially returned to a refined system to be used, and part of the liquor after being heated is delivered to a reverse osmosis system to perform the reverse osmosis treatment, reverse osmosis concentrated liquor is mixed into the refined mother liquor which is not treated by ultrafiltration to be treated again, and the reverse osmosis filtered liquor can be used as reuse water. The system is composed of the heat exchange system, the ultrafiltration system, the iron exchange system and the reverse osmosis system. The invention effectively recovers and utilizes the effective content in the refined mother liquor and reduces the pollution, and can be matched with the PTA device.

Description

technical field [0001] The invention relates to a method for recovering the refined mother liquor of a PTA device, and also relates to a system for recovering the refined mother liquor of a PTA device using the method, which belongs to the technical fields of chemical industry and environmental protection. Background technique [0002] The refining unit of the PTA (purified terephthalic acid) device uses water as a solvent, and the crude terephthalic acid (CTA) is heated and dissolved by beating and then enters the refining reactor. In the presence of a catalyst, hydrogen (H 2 ) to reduce the main impurity p-carboxybenzaldehyde (4-CBA) in the slurry into water-soluble p-toluic acid (p-TA), and then through processes such as crystallization, filtration or centrifugal separation, and drying, to obtain Product Purified Terephthalic Acid (PTA). During TA filtration or centrifugation, a large amount of aqueous solution (refined mother liquor) is separated, which contains TA, p-T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/42C02F1/44C02F103/36
Inventor 罗文德周华堂姚瑞奎张莼陈孟和李利军袁骏
Owner CHINA KUNLUN CONTRACTING & ENG
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