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Treatment of 2,3-acid producing waste water and resource recovering and atilizing method

A technology for waste water production and resource recovery, which is applied in the direction of adsorption water/sewage treatment, etc., and can solve problems such as pollution and extraction agent loss

Inactive Publication Date: 2003-10-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the extraction process, due to the emergence of the emulsified layer, part of the extraction agent is lost, causing new pollution, and it is difficult to treat the discharge in one step.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. Put 80 mL (about 60 grams) of NDA-708 resin (produced by Jinxiang Chemical Factory in Danyang, Jiangsu) into a jacketed glass adsorption column (Φ30×250 mm).

[0015] The acid wastewater discharged from the 2-hydroxy-3-naphthoic acid production workshop is yellow and turbid. After filtration, the filter cake is mainly 2-naphthol and 2-hydroxy-3-naphthoic acid, and the filtrate contains naphthalene-based organics (mainly 2-naphthol, 2-hydroxy-3-naphthoic acid) 905mg / L, pH=1~2, it is yellow transparent liquid, CoD cr =2579mg / L At room temperature (around 25°C), pass it through the above-mentioned resin bed at a flow rate of 640mL / h, the wastewater treatment capacity is 7600mL / batch, the adsorbed water is colorless and transparent, and the average concentration of naphthalene-based organics is 5.1mg / L. The removal rate of naphthalene series organic matter is 99.4%, the average CODcr of the effluent is 49mg / L, and the removal rate of CODcr is 98.1%. The adsorptio...

Embodiment 2

[0017] Embodiment 2. adsorption column is the same as embodiment 1., but filling Amberlite XAD-4 resin 80mL (approximately 60g), at room temperature is passed into embodiment 1 described 2-hydroxyl-3-naphthoic acid production with 480mL / h flow rate Wastewater 7040mL, effluent CODcr decreased from 2750mg / L to 47mg / L, concentration of naphthalene organics in effluent water decreased from 870mg / L to 3.8mg / L, effluent was colorless and transparent, and could be discharged up to standard after neutralization with dilute alkali.

[0018] Use 320mL 2mol / L NaOH aqueous solution as the desorption agent, the flow rate of the desorption agent is 40mL / h, the desorption temperature is 90±3°C, the desorption rate of naphthalene-based organic matter is 100%, and the high-concentration desorption solution contains 4.8% naphthalene-based organic matter g, the low-concentration desorption solution is used as the next batch of desorption agent.

Embodiment 3

[0020] a. Adsorption selects three jacketed adsorption towers, each tower has an inner diameter of 600mm and a tower height of 3500mm, and each tower is filled with 600 kg (about 800 liters) of NDA-708 resin, CODcr=1500~4200mg / L, pH=1~2 , the 2-hydroxy-3-naphthoic acid production wastewater whose temperature is less than 50°C is filtered and put into the adsorption tower. The adsorption tower adopts the method of connecting two towers I and II in series and downstream adsorption, and the adsorption flow rate is controlled at 7.6m 3 / h, the total amount of adsorption capacity of each batch is controlled at 70m 3 Left and right, after the wastewater is absorbed by the double towers, it flows to the outlet of the discharge ditch. At this time, the average CODcr of the treated wastewater is less than 100mg / L, and the pH is 1-2. It can be discharged up to the standard after adjusting the pH to 6 with NaOH aqueous solution.

[0021] b. Desorption, the adsorption 70m 3 The first No....

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PUM

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Abstract

Waste water from 3-hydroxy-2-naphthoic acid production is made to pass through NDA-708 resin adsorption bed layer so that 2-naphthol and 3-hydroxy-2-nahthoic acid as adsorbed onto the resin and the effluent water has a COD value lower than 100 mg / L.The effluent water is further neutralized with dilute alkali solution before discharged and the adsorbed resin is eluted with dilute alkali solution for regeneration with the eluate containing 2-naphthol and 3-hydroxy-2-naphthoic -acid as raw material being returned to 3-hydroxy-2-naphthoc-acid production process. The process can make the waste water reach discharge standard in only one step and recover 2-naphthol and 3-hydroxy-2-naphthoic-acid for reuse.

Description

1. Technical field [0001] The present invention relates to the treatment of waste water produced by 2-hydroxy-3-naphthoic acid, a naphthalene-based dye intermediate, specifically, 2-naphthol and 2-hydroxy-3-naphthalene in the waste water produced by 2-hydroxy-3-naphthoic acid Enrichment, separation and recycling of formic acid. 2. Background technology [0002] 2-Hydroxy-3-naphthoic acid is an important dye intermediate and pharmaceutical intermediate. Now producing one ton of 2-hydroxy-3-naphthoic acid will discharge about 38 tons of waste water, its pH is 1-2, and usually contains 2-naphthol 700-800mg / L and a small amount of 2-hydroxy-3 -Naphthoic acid and 2-hydroxy-6-naphthoic acid, CODcr about 2500mg / L. [0003] The liquid-phase complex extraction method reported in the literature uses the principle that tertiary amine organics can form complexes with compounds with functional groups such as sulfonic acid groups and hydroxyl groups, and the complexes are easy to disint...

Claims

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Application Information

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IPC IPC(8): C02F1/28
Inventor 陈金龙苏幸张全兴周建明冯文国周宏钧陈建海周雷潘丙才
Owner NANJING UNIV
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