Method for treating wastewater from production of methyl naphthol and reclaiming methyl naphthol and methyl naphthylamine

A technology for the production of waste water and cresol, applied in chemical instruments and methods, separation methods, adsorption water/sewage treatment, etc., can solve the problems of high acidity of waste water, waste of resources, threat to human health, etc., and achieve the effect of good regeneration performance

Inactive Publication Date: 2006-12-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high acidity, high salt content, and high toxicity of the waste water, it has not been effectively treated for a long time. At present, most domestic and foreign menaphthylamine manufacturers use a large amount of dilution for biochemical treatment, which not only causes waste of resources, but also seriously pollutes the ecological environment. threat to human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 10 mL (about 7.5 g) of macroporous adsorption resin NDA-150 into a jacketed glass adsorption column (Φ12×160 mm). Wastewater COD is 1200mg / L. After filtration, it is passed through the resin bed at a flow rate of 50mL / h at 15±5°C, and the treatment capacity is 600mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, the concentration of tonaphthol is 1mg / L, the concentration of tonaphthylamine is 0.5mg / L, and the COD is 80mg / L.

[0019] When the adsorption reaches the leakage point (the concentration of methylnaphthol and methylnaphthylamine in the adsorbed water is about 2% of the influent concentration), the adsorption is stopped, and 30mL methanol is flowed at a flow rate of 10mL / h at a temperature of 20±5°C. Flow through the resin bed for desorption. The methanol solution of the desorbed methylnaphthol and methylnaphthylamine is rectified, and the steamed methanol is used as a desorption agent for the next batch of desorption o...

Embodiment 2

[0021] Put 100mL (about 75g) of NDA-150 resin into a jacketed glass adsorption column (Φ32×260mm). Wastewater COD is 1500mg / L. After filtration, it is passed through the resin bed at 40±5°C at a flow rate of 1500mL / h, and the treatment capacity is 8000mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, the concentration of methylnaphthol is 2.5mg / L, the concentration of methylnaphthylamine is 1.7mg / L, and the COD is 88mg / L.

[0022] When the adsorption reaches the leakage point (the concentration of methylnaphthol and methylnaphthylamine in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 350mL volume percentage is 95% methanol solution at a temperature of 60±5°C, with 300mL The flow rate of / h flows through the resin bed for desorption. The methanol solution of the desorbed methylnaphthol and methylnaphthylamine is rectified, and the steamed methanol is used as a desorption agent for the next batch of...

Embodiment 3

[0024] Put 1000mL (about 750g) of ND-150 resin into a jacketed glass adsorption column (Φ70×500mm). Wastewater COD is 2000mg / L. After filtration, it is passed through the resin bed at 25±5°C at a flow rate of 8000mL / h, and the treatment capacity is 80000mL / batch. After being adsorbed by the resin, the effluent is colorless and transparent, the concentration of methylnaphthol is 2.1mg / L, the concentration of methylnaphthylamine is 1.2mg / L, and the COD is 84mg / L.

[0025] When the adsorption reaches the leakage point (the concentration of methylnaphthol and methylnaphthylamine in the adsorption water is less than 2% of the influent concentration), the adsorption is stopped, and 2000mL95% ethanol is flowed at a flow rate of 4000mL / h at a temperature of 50±5°C. Flow through the resin bed for desorption. The methanol solution of the desorbed methylnaphthol and methylnaphthylamine is rectified, and the steamed ethanol is used as a desorption agent for the next batch of desorption o...

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PUM

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Abstract

The invention discloses a harnessing method of naphthol manufacturing waste water and recycling method of naphthol and a-haphthylamine, which comprises the following steps: filtering naphthol manufacturing waste water; removing suspension; making filtrate through adsorption tower with large-hole resin; stopping adsorbing until the adsorption reaches leakage point; adopting carbinol or alcohol water solution as desorption agent to regenerate; obtaining alcoholic solution of naphthol and a-haphthylamine as desorption agent; rectifying the desorbed alcoholic solution; returning remained composition of naphthol and a-haphthylamine in the dehydrating procedure of original manufacturing process. The invention makes naphthol density less than 3mg/L, a-haphthylamine density less than 2mg/L and COD less than 100mg/L, which recycles resource to reduce manufacturing cost obviously.

Description

1. Technical field [0001] The invention relates to a method for treating waste water discharged in the production process of methyl naphthol and recycling useful resources in the waste water. Specifically, it refers to a method for separating and recycling methylnaphthol and methylnaphthylamine while controlling the methylnaphthol production wastewater. 2. Background technology [0002] Naphthol is used in the dye industry to produce acid yellow 1, acid orange 20, mordant black 3, mordant black 11, solvent red 3, solvent orange 5, oil palm GB, etc.; in the pharmaceutical industry, it can be used to manufacture preservatives and Anti-rheumatic drugs, etc.; it is also an effective antioxidant for many aldehydes, mineral oils and vegetable oils. It is widely used in the synthesis of incense, rubber anti-aging agents and color couplers for color film, and as an important raw material for insecticide carbaryl. The industrial production methods of methylnaphthol mainly include te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/28B01D15/42
Inventor 张炜铭许正文潘丙才张庆建张全兴李爱民杜伟张庆瑞郑凯陈金龙
Owner NANJING UNIV
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