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Crude pta purification treatment method

A treatment method and raw material technology, which is applied in the field of PTA purification treatment, can solve the problems of high cost, secondary liquid supply wastewater, etc., and achieve the effects of avoiding the discharge of secondary wastewater, complete wastewater recovery and reuse, and high purity

Active Publication Date: 2020-06-30
绍兴众聚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrialized purification of the crude PTA that adopts at present is still blank at present, although there is the method that relates to PTA purification in patent CN200510023356.8, CN200910096512.1, but, the method cost that these methods adopt is too high, and will produce after purification Secondary liquid supply wastewater

Method used

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  • Crude pta purification treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 Shown crude PTA purification processing method, its main steps are as follows:

[0028] (1) Raw material preparation: prepare the lime pool and the crude PTA pool, add raw materials with a certain mass ratio respectively, add these raw materials into the prepared mother liquor in advance, stir continuously to form a uniform mixed solution, and store it at room temperature for standby; the mixed solution is supplied by The overflow method, the mother liquor is added directly in the initial configuration, and in the subsequent continuous production, the purified solid-liquid separation liquid is added to realize the recycling of the mother liquor; the raw material used in this step is printing and dyeing alkali reduction wastewater pressure The thick PTA of filter treatment gained, its humidity is 30%, and the lime humidity that is dropped into in the lime pond is 4%; Above-mentioned lime and thick PTA drop into mass ratio according to 1 ton of thick PAT ...

Embodiment 2

[0036] Such as figure 1 Shown crude PTA purification processing method, its main steps are as follows:

[0037] (1) Raw material preparation: prepare the lime pool and the crude PTA pool, add raw materials with a certain mass ratio respectively, add these raw materials into the prepared mother liquor in advance, stir continuously to form a uniform mixed solution, and store it at room temperature for standby; the mixed solution is supplied by The overflow method, the mother liquor is added directly in the initial configuration, and in the subsequent continuous production, the purified solid-liquid separation liquid is added to realize the recycling of the mother liquor; the raw material used in this step is printing and dyeing alkali reduction wastewater pressure The thick PTA of filtration processing gained, its humidity is 30%, and the lime humidity that is dropped into in the lime pond is 10%; Above-mentioned lime and thick PTA input mass ratio are input 200 kilograms accord...

Embodiment 3

[0045] Such as figure 1 Shown crude PTA purification processing method, its main steps are as follows:

[0046] (1) Raw material preparation: prepare the lime pool and the crude PTA pool, add raw materials with a certain mass ratio respectively, add these raw materials into the prepared mother liquor in advance, stir continuously to form a uniform mixed solution, and store it at room temperature for standby; the mixed solution is supplied by The overflow method, the mother liquor is added directly in the initial configuration, and in the subsequent continuous production, the purified solid-liquid separation liquid is added to realize the recycling of the mother liquor; the raw material used in this step is printing and dyeing alkali reduction wastewater pressure The thick PTA of filter processing gained, its humidity is 70%, and the lime humidity that is dropped into in the lime pond is 20%; Above-mentioned lime and thick PTA input mass ratio are input 500 kilograms according ...

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Abstract

The invention relates to a crude PTA purification method, and comprises the main steps as follows: (1) preparation of raw materials; (2) neutralization treatment; (3) first solid-liquid separation treatment; (4) flocculation; (5) second solid-liquid separation treatment; (6) acid precipitation treatment; and (7) product separation treatment. The method has the following advantages: (1) the purification cost is greatly reduced: lime is cheap, and reacts with acid radicals to produce a safety material for building gypsum products, such as gypsum board, lightweight brick and cement retarder, so as to avoid secondary pollutants and make up for purification cost by sale and utilization; and (2) after water absorption and digestion, lime turns into calcium hydroxide, which react with the acid radical in the mother liquor to produce water-containing substances; the mother liquor can be recycled to avoid secondary discharge of wastewater and to achieve more complete wastewater recycling reuse, so as to obtain PTA with higher purity.

Description

technical field [0001] The invention relates to a crude PTA purification treatment method, which belongs to the technical field of PTA purification treatment. Background technique [0002] At present, in some printing and dyeing enterprises, the process of alkali-dissolving some polyester fibers is mostly used in the pre-treatment of some polyester fabrics to obtain finished products with better hand feeling. The main component of this part of the dissolved polyester fibers is polyethylene terephthalate Glycol ester is decomposed into terephthalic acid (PTA) and ethylene glycol and dissolved in wastewater. Because wastewater is alkaline, PTA is dissolved in wastewater in the state of organic salt of sodium terephthalate. Because terephthalate The benzene ring structure of formic acid cannot be biodegraded by microorganisms, so the treatment of alkali reduction wastewater has become a major problem for printing and dyeing enterprises. [0003] The pickling method is to reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/42C07C51/487C07C63/26
CPCC07C51/42C07C51/487C07C63/26
Inventor 王建中骆阿明
Owner 绍兴众聚环保科技有限公司