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Method for separating nitrochlorobenzene and nitrophenol waste water by HZSM-5 zeolites and resource recovery

A nitrochlorobenzene, adsorption and separation technology, applied in the direction of adsorption water/sewage treatment, etc., can solve the problems of difficult regeneration, no selectivity, low selectivity of resin, etc., achieve good economic benefits, realize resource utilization, high durability The effect of acidity and alkalinity

Inactive Publication Date: 2004-04-21
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon has better adsorption performance, but its regeneration is difficult (requires superheated steam and higher temperature), basically has no selectivity, and the adsorbed substances are difficult to realize recycling
The use of resins for adsorption has been widely used and formed a unique adsorption separation technology, but the selectivity of existing resins is not high, and it is still difficult to effectively separate organic isomers or homologues with similar properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Adopt static treatment method, process the organic waste water that produces nitrochlorobenzene (the initial concentration of p-nitrochlorobenzene is 18.75mg / g HZSM-5 zeolite). The organic wastewater containing nitrochlorobenzene and nitrophenol isomers to be treated is filtered first, and the pH value is adjusted, and then transported to a closed adsorption container equipped with HZSM-5 zeolite for adsorption. HZSM-5 zeolite is used before use Dilute 1% HNO 3 Treatment and drying; HZSM-5 zeolite Si / Al is 48; the average particle diameter is 5 μm; the adsorption vessel is closed; magnetic stirring is used, and the vibration speed is 150 rpm; the initial concentration of o-nitrochlorobenzene: p-nitrochlorobenzene The initial concentration is 2:1; the temperature is 300K; the adsorption time is 10min. The separation rate of p-nitrochlorobenzene is 99.1%. Using ethanol as the recovery solution, the recovery rate of p-nitrochlorobenzene was 99.5% at 303K. ...

Embodiment 2

[0016] Example 2: The static treatment method was used to treat the organic waste water from the production of nitrophenol (the initial concentration of p-nitrophenol was 625mg / g HZSM-5 zeolite). The organic wastewater containing nitrochlorobenzene and nitrophenol isomers to be treated is filtered first, and the pH value is adjusted, and then transported to a closed adsorption container equipped with HZSM-5 zeolite for adsorption. The conditions are: HZSM-5 zeolite Dilute with 1% HNO before use 3 Treatment and drying; HZSM-5 zeolite Si / Al is 48; the average particle diameter is 10 μm; a constant temperature shaker is used for vibration, and the vibration speed is 150 rpm; the initial concentration of o-nitrophenol: the initial concentration of p-nitrophenol is 1 : 1; the temperature is 298K; the adsorption time is 30min. The separation rate of p-nitrophenol was 85%. Using dilute sodium hydroxide solution as the recovery solution, the recovery rate of p-nitrophenol is close t...

Embodiment 3

[0017] Example 3: The static treatment method was used to treat the organic waste water from the production of nitrophenol (the initial concentration of p-nitrophenol was 625mg / g HZSM-5 zeolite). The organic wastewater containing nitrochlorobenzene and nitrophenol isomers to be treated is filtered first, and the pH value is adjusted, and then transported to an open adsorption container equipped with HZSM-5 zeolite for adsorption. The conditions are: HZSM-5 zeolite Dilute with 1% HNO before use 3 Treatment and drying; HZSM-5 zeolite Si / Al is 48; average particle diameter is 18 μm; constant temperature shaker vibration is used, and the vibration speed is 70 rpm; initial concentration of o-nitrophenol: initial concentration of p-nitrophenol is 4 : 1; the temperature is 298K; the adsorption time is 8 hours. The separation rate of p-nitrophenol was 89%. Using dilute sodium hydroxide solution as the recovery solution, the recovery rate of p-nitrophenol is close to 100%.

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Abstract

A process for recovering the p-nitrochlorobenzene from the sewage containing nitrochlorobenzene and nitrophernol by the adsorption of HZSM-5 zeolite includes such steps as treating the granular H2SM-5 zeolite by diluted HNO3, baking, loading it in an enclosed adsorptive container, delivering said sewage into the container, and adsorbing at 275-340 deg.K and 50-200 rpm for 10s-12hr. Its advantages are high effect and low consumption.

Description

technical field [0001] The present invention relates to an adsorption separation technology, specifically utilizing the selective adsorption performance of HZSM-5 zeolite to separate and purify p-nitrochlorobenzene and p-nitrochlorobenzene from organic waste water containing nitrochlorobenzene and nitrophenol isomers. Nitrophenol. Background technique [0002] Adsorption is a low energy consumption solid phase extraction separation technique. Adsorption is due to the high surface energy of molecules or atoms on the solid surface of the adsorbent due to asymmetric bonding. When the molecules collide with the solid surface, they are retained on the solid surface by the unbalanced force, so that the concentration of the adsorbed molecules on the surface of the adsorbent is higher than that in the bulk phase of the solution. The main adsorbents used in the treatment of fine organic chemical wastewater by adsorption method are activated carbon, modified cellulose and resin. Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28
Inventor 郭照冰郑正郑寿荣马建军王瑨胡文勇赵翠萍杨凯唐登勇帖靖玺
Owner NANJING UNIV
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