Process for purifying and resource recovery using from waste water of producing H cide

A technology for production wastewater and resource recovery, applied in the field of recovering useful resources H acid and T acid, can solve problems such as resource waste, achieve good regeneration performance, and achieve the effect of resource recovery and reuse

Inactive Publication Date: 2008-09-03
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, H-acid production enterprises at home and abroad mainly use dilution-biochemical treatment of the wastewater. At this time, H-acid and T-acid in the water body are destroyed into small molecular substances during the treatment process, resulting in waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 10 mL (about 6.8 g) of macroporous complex adsorption resin NDA-910 into a jacketed glass adsorption column (Φ12×160 mm). Wastewater COD Cr It is 23000mg / L. After filtering, pass it through the resin bed at a flow rate of 10mL / h at 15±5°C, and the processing capacity is 70mL / batch. After being adsorbed by resin, the effluent is colorless and transparent, the concentration of H acid is 14mg / L, the concentration of T acid is 25mg / L, COD Cr It is 550mg / L.

[0017] 20mL of 4% sodium hydroxide aqueous solution is passed through the resin bed in parallel at a flow rate of 5mL / h at a temperature of 45±5°C for desorption. The desorbed high-concentration sodium salt solution of H acid and T acid can be returned to the alkali fusion process of the original production process. The low-concentration desorption solution is used to prepare the aqueous sodium hydroxide solution for the next batch of desorption.

Embodiment 2

[0019] Put 100 mL (about 68 g) of NDA-910 resin into a jacketed glass adsorption column (Φ32×260 mm). Wastewater COD Cr It is 22000mg / L. After filtering, pass it through the resin bed at a flow rate of 150mL / h at 40±5°C, and the processing capacity is 700mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, the concentration of H acid is 15mg / L, the concentration of T acid is 23mg / L, COD Cr 500mg / L.

[0020] Pass 100mL of 10% sodium hydroxide aqueous solution at a temperature of 35±5°C and flow through the resin bed at a flow rate of 50mL / h for desorption. The desorbed high-concentration sodium salt solution of H acid and T acid can be returned to the alkali fusion process of the original production process. The low-concentration desorption solution is used to prepare the aqueous sodium hydroxide solution for the next batch of desorption.

Embodiment 3

[0022] Put 1000mL (about 680g) of ND-910 resin into a jacketed glass adsorption column (Φ70×500mm). Wastewater COD Cr It is 24000mg / L. After filtering, pass it through the resin bed at a flow rate of 2500mL / h at 15±5℃, and the processing capacity is 6000mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, the H acid concentration is 18mg / L, the T acid concentration is 27mg / L, COD Cr It is 620mg / L.

[0023] Pass 1500mL of 6% sodium hydroxide aqueous solution at a temperature of 40±5°C and flow through the resin bed at a flow rate of 1000mL / h for desorption. The desorbed high-concentration sodium salt solution of H acid and T acid can be returned to the alkali fusion process of the original production process. The low-concentration desorption solution is used to prepare the aqueous sodium hydroxide solution for the next batch of desorption.

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PUM

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Abstract

A method for cleaning and reclaiming the sewage generated by preparing H acid includes such steps as filtering, adsorbing by resin column for separating H acid and T acid frmo the saturated solution of sodium sulfate, using the saturated solution to flush the fitlered cake of H acid and T acid, eluting the resin column by aqueous solution of sodium hydroxide, returning the high-concetnration sodium salt solution back to alkali fusing step, and preparing the aqueous solution of sodium hydroxide from the low-concentration desorptive liquid for desorptive step.

Description

1. Technical field [0001] The invention relates to a method for purifying waste water discharged in the production process of H acid and recycling useful resources in the waste water. Specifically, it is a method for separating and reusing saturated sodium sulfate solution from H acid production wastewater, and reclaiming useful resources H acid and T acid from wastewater. 2. Background technology [0002] H acid is 1-amino-8-naphthol-3,6-disulfonic acid (chemical structural formula is: ), is an important naphthalene dye intermediate, it is mainly used in the production of direct, acid, reactive dyes and azo dye intermediates, such as more than 90 kinds of acid sky blue, direct black reactive brilliant red K-2BP, etc., and can also be used for pharmaceutical industry. At present, the production process of domestic H acid is generally made of refined naphthalene as raw material, through sulfonation, nitration, neutralization, reduction, alkali fusion and acid precipitation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28
Inventor 陈金龙张炜铭张波张全兴鲁俊东潘丙才李爱民费正皓
Owner NANJING UNIV
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