Treatment method for waste salt water generated in production process of polycarbonate

A production process, polycarbonate technology, applied in the direction of neutralization of water/sewage treatment, filtration treatment, natural water treatment, etc., can solve the problem of low removal rate of ammonia nitrogen and chemical oxygen demand COD, adsorbent mixed into the wastewater system, adsorbent Complicated preparation and other problems, to achieve the effect of low investment cost of industrialization, avoid secondary pollution, and convenient operation

Inactive Publication Date: 2019-01-18
QINGDAO UNIV OF SCI & TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 104445500 A introduces a low-concentration ammonia-nitrogen wastewater adsorption treatment process. This method has the problem of only single treatment of ammonia nitrogen and cumbersome preparation of adsorbents. Moreover, the content of ammonia nitrogen after treatment is as high as 15ppm, which cannot meet the production process of ion-exchange membrane caustic soda. Requirements for electrolyzed water
Chinese patent CN 103183394 A introduces a method for treating wastewater by adsorption. This method has the problem that the adsorbent is mixed into the wastewater system and needs to be separated again, and the removal rate of ammonia nitrogen and chemical oxygen demand (COD) is too low.

Method used

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  • Treatment method for waste salt water generated in production process of polycarbonate
  • Treatment method for waste salt water generated in production process of polycarbonate

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Experimental program
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Effect test

Embodiment 1

[0034] The concrete technological process of the treatment method of the waste brine produced in the polycarbonate production process of the present invention is as follows figure 1 shown.

[0035] In the first step, the waste brine generated in the PC production process is adjusted to 50°C by a heat exchanger, and then sampled and analyzed; among them, the pH value is about 11, the content of sodium chloride is 9.83%, the content of sodium carbonate is 1.36%, bisphenol A And the total content of p-tert-butylphenol is 210ppm, quaternary ammonium salt is 19ppm, TOC is 173ppm, TN is 5.4ppm;

[0036] In the second step, the above-mentioned waste brine is introduced into 1.5m 3 to the 80% liquid level, add hydrochloric acid with a mass percentage concentration of 30%, start stirring to adjust the pH value of the waste brine in the acid-adjusting kettle to 3, then turn on the feed pump P910, and pass through the 200-mesh coarse filter in turn And 5 micron precision filter to remo...

Embodiment 2

[0042] The first step, with embodiment 1;

[0043] In the second step, the waste brine treated in the first step is introduced into 1.5m 3to the 80% liquid level, add hydrochloric acid with a mass percentage concentration of 30%, start stirring to adjust the pH value of the waste brine in the acid-adjusting kettle to 2; then turn on the feed pump P910, and pass through the 100-mesh coarse filter in turn and 10 micron precision filter, all transported to the high tank;

[0044] In the third step, the waste brine in the head tank enters the macroporous resin adsorption column for adsorption by gravity flow (the diameter of the adsorbent is 300mm, and the height is 900mm), and the flow rate of the waste brine is controlled by a flow meter to 0.2m 3 / h (ie flow rate 3BV / h), the adsorption time is 20min, and the adsorption temperature is controlled at 20-60°C;

[0045] In the fourth step, the absorbed waste brine enters the alkali-adjusting kettle, and a 10% sodium hydroxide solu...

Embodiment 3

[0049] The first step, with embodiment 1;

[0050] In the second step, the waste brine treated in the first step is introduced into 1.5m 3 to the 80% liquid level, add hydrochloric acid with a mass percentage concentration of 30%, start stirring to adjust the pH value of the waste brine in the acid-adjusting kettle to 2; then turn on the feed pump P910, and pass through the 100-mesh coarse filter in turn and 5 micron precision filter, all transported to the high tank;

[0051] In the third step, the waste brine in the head tank enters the macroporous resin adsorption column for adsorption by gravity flow (the diameter of the adsorbent is 100mm, and the height is 300mm), and the flow rate of the waste brine is controlled by a flowmeter to 120mL / h (ie, the flow rate is 3BV / h). , the adsorption time is 20min; the adsorption temperature is controlled at 20-60°C;

[0052] In the fourth step, the absorbed waste brine enters the alkali-adjusting kettle, and a 10% sodium hydroxide s...

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Abstract

The invention relates to a treatment method for waste salt water generated in the production process of polycarbonate. The treatment method comprises the following steps: the temperature of the wastesalt water generated in the production process of the polycarbonate PC and containing bisphenol A, p-tert-butylphenol and quaternary ammonium salt is regulated to 20-60 DEG C by a heat exchanger, thenthe waste salt water is introduced into an acid-regulating kettle, and the pH value is regulated to 1-4; then trace suspended solids are removed by a coarse filter and a precise filter, and the wastesalt water is conveyed to a high-position groove; the waste salt water flows into macroporous resin adsorbing columns by gravity to be adsorbed, then enters an alkaline-regulating kettle, and the pHvalue is regulated to 10-14; finally, the waste salt water enters active-carbon adsorbing columns to be adsorbed. The treatment method has the beneficial effects that phenolic organic matters in the waste salt water of the PC can be completely removed, and most of quaternary ammonium salt is removed; in the treated salt water, the content of the quaternary ammonium salt is less than 1ppm, the content of TOC (Total Organic Carbon) is less than 10ppm and the content of TN (Total Nitrogen) is less than 3ppm; as a raw material, the treated salt water can be used for a process for preparing causticsoda by a chlor-alkali ion membrane, and can not cause increase of voltage of an electrolytic cell, so that sodium chloride and water in the waste salt water can be recycled, and the recycling of thematerials is realized.

Description

Technical field: [0001] The invention relates to a treatment method for industrial waste brine, in particular to a treatment method for waste brine produced in the production process of polycarbonate (abbreviated as PC), and belongs to the technical field of waste water treatment. Background technique: [0002] PC has outstanding impact resistance, heat resistance, cold resistance, good light transmission, and has high tensile strength, bending strength, and elongation. It is currently the second largest engineering plastic in the world after nylon. It has a wide range of uses in the national economy and has been used in many fields such as construction, automobile manufacturing, medical equipment, optics, electronics, and aerospace. [0003] At present, the preparation of industrialized PC mainly adopts the interfacial phosgene method. The interfacial phosgene method refers to that in the presence of an acid acceptor such as an aqueous solution of an alkali metal hydroxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/34C02F101/38C02F103/38
CPCC02F1/001C02F1/283C02F1/285C02F1/66C02F9/00C02F2101/345C02F2101/38C02F2103/38
Inventor 程华农胡鸿宾邱娜娜崔扬岳金彩马瑞进李玉刚付振波谭心舜梁睿渊郑世清
Owner QINGDAO UNIV OF SCI & TECH
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