Method for separating and recovering nitro chlorobenzene from wastewater by using silanization modified zeolite

A technology of nitrochlorobenzene and silanization, which is applied in chemical instruments and methods, other chemical processes, adsorption water/sewage treatment, etc., can solve the problems of low selectivity and difficulty in effective separation, and achieves improved separation effect and ease of use. The effect of regeneration, good economic benefits and environmental benefits

Inactive Publication Date: 2007-04-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selectivity of existing resins is not high, and it is still difficult to effectively separate isomers or homologues of organic compounds with similar properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Suspend 2g of HZSM-5 zeolite in 50ml of n-hexane, stir, and heat to keep the n-hexane in a reflux state. Add 0.3ml of tetraethyl orthosilicate solution (corresponding to 4wt% SiO2) to the mixture, and react for 1h. The sample obtained after removing n-hexane by evaporation was calcined at 773K for 4h.

[0022] Chlorobenzene nitrification wastewater was treated with silanized HZSM-5 zeolite. Take 400ml of the mixed solution, wherein the initial concentration of p-nitrochlorobenzene is 30mg / L, and the mass of the silanized HZSM-5 zeolite is 0.22g. HZSM-5 zeolite Si / Al is about 50; 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: the initial concentration of p-nitrochlorobenzene is 1 : 1.2; the temperature is 300K; the adsorption time is 60min. The recovery purity of p-nitrochlorobenzene is 98.3%, and the recovery purity of ...

Embodiment 2

[0023] Embodiment 2: Get HZSM-5 zeolite Si / Al to be about infinity, promptly do not contain Al in the zeolite, other conditions are the same as embodiment 1, after processing, the recovery purity of o-nitrochlorobenzene, p-nitrochlorobenzene is higher than embodiment 1 slightly worse.

Embodiment 3

[0024] Embodiment 3: Take HZSM-5 zeolite Si / Al to be about 10, other conditions are the same as embodiment 1, after treatment, the recovery purity of o-nitrochlorobenzene and p-nitrochlorobenzene is equivalent to that of embodiment 1.

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Abstract

Disclosed is an absorption, separation and recycle techonoly with high efficiency and low energy cost, which can separate and recycle with high purity from organic waste water containing isomer of chloronitrobenzene whose characters are close, and has wide application in the future. The invention uses chloronitrobenzene and resource recycling method in water by zeolite having been processed by silane decorated by silane, which is transmitting the organic waste water containing isomer of chloronitrobenzene to be processed to the absorbing container of HZSM-5 zeolite decorated by silane to be absorbed, and the conditions are: the diameter of HZSM-5 zeolite particle decorated by silane is 1-25mu m, the original density ratio of in waste water is 1-5:1, the mass ratio of before absorption and zeolite after decorction is 0.02-0.12, the vibration speed of ratation is 80-200r / m, the temperature range is 275-350K and the time for absorption is 15s-48h. The invention has low cost and wide application in the future.

Description

technical field [0001] The invention relates to a method for selectively adsorbing and separating nitrochlorobenzene from organic waste water containing isomers of o-nitrochlorobenzene and p-nitrochlorobenzene, especially using a silanized HZSM- 5 Zeolite is a method for adsorbing and separating high-purity p-nitrochlorobenzene and o-nitrochlorobenzene from wastewater containing nitrochlorobenzene isomers. Background technique [0002] The treatment of organic chemical wastewater mainly includes biological methods and physical and chemical methods. Due to the high toxicity and stability of organic matter in wastewater, it is difficult to obtain ideal results by using a single biological method to treat wastewater; although advanced oxidation technology can be used to treat organic wastewater to varying degrees It can effectively degrade pollutants in water bodies, but it is not economical. Adsorption recovery technology is increasingly favored by people because it realizes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/18
Inventor 郑正郭照冰郑寿荣江芳帖靖玺唐登勇周培国袁守军王艳锦喻晓陈立强范杰顾春晖牟艳艳程莹莹张继彪钟云彭小成
Owner NANJING UNIV
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