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Treating process of effluent from N-acetanilide production

A technology for the production of acetoacetyl and waste water, which is applied in the direction of adsorption water/sewage treatment, etc., and can solve the problems such as the report that no N-acetoacetyl aniline production waste water treatment technology has been found.

Inactive Publication Date: 2006-08-02
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Before the completion of the present invention, the existing domestic and foreign documents in the last twenty years were searched, and no report was found about the wastewater treatment technology for N-acetoacetylaniline production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 20ml of composite functional adsorption resin NDA-66 into a jacketed glass adsorption column (Φ20×350mm). At room temperature (20-25°C), after filtering the N-acetoacetanilide production wastewater, it passes through the resin bed at a flow rate of 30mL / h, and the wastewater treatment capacity is 300mL / batch. The COD of the original wastewater is 18800mg / L, the concentration of N-acetylacetoanilide is 15650mg / L, the COD of the adsorbed effluent is 1460mg / L, the concentration of N-acetylacetoanilide is 1126mg / L, and the removal rate of COD and N-acetoacetoanilide 92.2% and 92.8%, respectively.

[0018] Use 20mL of 3mol / L NaOH aqueous solution at a temperature of 50±2°C and 60mL of tap water to desorb and regenerate the resin bed sequentially, with a desorption flow rate of 20mL / h. The desorption rates of COD and N-acetylacetylanilide were 99.8% and 99.3%, respectively. The first 20mL of the desorbed liquid is a high-concentration desorbed liquid, and its pH is adju...

Embodiment 2

[0020] Other operating conditions are the same as implementation example 1, the wastewater adsorption flow rate is doubled, and the wastewater passes through the resin bed with a flow rate of 60mL / h after filtration. The adsorption treatment effect is as follows: the original wastewater COD is 18800mg / L, and the concentration of N-acetoacetaniline The COD of the adsorbed water is 1980mg / L, the concentration of N-acetoacetanilide is 1791mg / L, and the removal rates of COD and N-acetoacetanilide are 89.5% and 88.6% respectively.

Embodiment 3

[0022] Put 200mL composite functional adsorption resin NDA-66 into a jacketed glass adsorption column (Φ50×450mm). At room temperature (20-25°C), after filtering the N-acetylacetoanilide production wastewater, it passes through the resin bed at a flow rate of 300mL / h, and the wastewater treatment capacity is 3000mL / batch. The COD of the original wastewater is 17640mg / L, the concentration of N-acetylacetoanilide is 14310mg / L, the COD of the adsorbed effluent is 1603mg / L, the concentration of N-acetylacetoanilide is 1080mg / L, and the removal rate of COD and N-acetoacetoanilide 90.9% and 92.4%, respectively.

[0023] Use 200mL of 6mol / L NaOH aqueous solution at a temperature of 50±2°C and 600mL of tap water to regenerate the resin bed in countercurrent desorption, the desorption flow rate is 200mL / h, and the desorption rates of COD and N-acetoacetanilide are 99.7% and 99.5% respectively . The first 200mL of the desorbed liquid is a high-concentration desorbed liquid. Adjust its...

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Abstract

The treating process of effluent from N-acetanilide production includes the following main steps: passing the filtrate of effluent from N-acetanilide production through adsorption tower filled with composite adsorption resin or macro porous adsorption resin in the conditions of 10-50 deg.c temperature and 0.5-5 BV / hr flow rate so as to adsorb most of N-acetanilide on the resin; regenerating the adsorbedresin with desorbing agent, regulating the pH value of high concentration desorbed liquid to 5-10, recovering N-acetanilide, returning the recovered N-acetanilide to production process and using the low concentration desorbed liquid for the next time of desorption. The treating process has COD and N-acetanilide eliminating rate up to 90 %, and desorption rate higher than 99 %. The used composite adsorption resin may be regenerated for further use, and the treating process is simple, efficient and economic.

Description

1. Technical field [0001] The invention relates to a method for treating wastewater produced by N-acetylacetylaniline, more specifically, a method for treating wastewater produced by N-acetylacetylaniline by using a composite functional adsorption resin or a macroporous adsorption resin. 2. Background technology [0002] N-Acetoacetylaniline (molecular formula C 10 h 11 o 2 N) is an important organic intermediate, widely used in the manufacture of dyes such as pyrazolone, bright yellow 5G, acid complex yellow GR, neutral deep yellow GL, Hansa yellow G, pigment yellow G, etc. The raw material of rustling can also be used in medicine, pigment, pigment and organic synthesis. N-acetoacetylaniline is synthesized from aniline and diketene, and its production process will produce high-concentration toxic organic wastewater. The pH value of the wastewater is 5-6, the COD is as high as 18000mg / L, and the content of N-acetoacetylaniline is as high as 15000mg / L. [0003] Before th...

Claims

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Application Information

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IPC IPC(8): C02F1/28
Inventor 李爱民朱兆连刘福强赵卫伟胡学伟杨鑫王春张全兴
Owner NANJING UNIV
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