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Process for adsorpting and separating waste water containing nitro-chlrobenzene by antimony oxide modified zeloite and resource recovery process thereof

A nitrochlorobenzene, adsorption and separation technology, applied in the direction of adsorption water/sewage treatment, etc., to achieve the effect of improving selective adsorption performance, broad application prospects, and good acid resistance

Inactive Publication Date: 2005-01-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the current research hotspots is to modify and modify the surface of zeolite. Common modification methods include chemical vapor (or liquid phase) deposition and metal oxide solid-phase reaction. Significant work still needs to be done on characterization and stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Treatment of organic wastewater generated by nitration of chlorobenzene with antimony oxide-modified HZSM-5 zeolite.

[0013] Mix antimony oxide and HZSM-5 zeolite powder uniformly in a mass ratio of 1:4, 2 The temperature was raised to 500°C at a rate of 10°C / min under the protection of , and calcined at this temperature for 2h. Take 400ml of organic wastewater, in which the initial concentration of p-nitrochlorobenzene is 25mg / L, and carry out some conventional pretreatments on the wastewater, such as filtering and adjusting the pH value. The total mass of the mixture of HZSM-5 zeolite and antimony oxide before modification is 0.17 g, and the antimony oxide accounts for 20% of the total mass of the mixture before calcination, which is about 0.034 g. The Si / Al ratio of HZSM-5 zeolite modified with antimony oxide is 48; the particle diameter of HZSM-5 zeolite modified with antimony oxide is 5 μm; the adsorption vessel is closed; magnetic stirring is used, an...

Embodiment 2

[0014] Embodiment 2: in embodiment 1, other conditions are constant, and when adsorption time is 5min, the separation rate of p-nitrochlorobenzene is up to 99.8%, and the separation rate of o-nitrochlorobenzene is 95.6%; When adsorption time is 600min, The separation rate of p-nitrochlorobenzene was 98.6%. The separation rate of o-nitrochlorobenzene was 95.8%.

Embodiment 3

[0015] Embodiment 3: the initial concentration of o-nitrochlorobenzene in embodiment 1: the initial concentration of p-nitrochlorobenzene is 1: 1 and changes 2: 1, and other operating conditions remain unchanged, p-nitrochlorobenzene and o-nitrochlorobenzene The separation rate of chlorobenzene remained basically unchanged.

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Abstract

The invention is a method of using stibium oxide decorated HZSM-5 zeolite to absorb and separate nitrobenzene organic waste water and recovering resources, transporting the organic waste water containing nitrobenzene isomer to be processed to an absorbing container holding the stibium oxide decorated HZSM-5 zeolite for absorbing. The particle size of the HZSM-5 zeolite is 0.5-20 mum; the stibium oxide accounts for 5%-20% of the mass of the powder before burned; the initial concentration ratio of ortho-isomer to para-isomer of nitrochlorobenzene in the waste water is 1-5 to 1; the vibrating speed is 50-200 r / min; the temperature range is 275-340 K; the absorbing time is 10 s-12 h. It utilizes the character that the special crystal structure of HZSM-5 zeolite and the solid-phase reaction of HZSM-5 zeolite with the stibium oxide powder cause the variation of surface structure of the HZSM-5 zeolite, to efficiently separate ortho-nitrochlorobenzene and para-nitrochlorobenzene from the nitrochlorobenzene waste water, respectively.

Description

technical field [0001] The invention relates to a method for selective adsorption and separation of nitrochlorobenzene from organic waste water containing nitrochlorobenzene isomers, in particular to a method for isomerizing nitrochlorobenzene from HZSM-5 zeolite modified with antimony oxide A method for adsorbing and separating p-nitrochlorobenzene and o-nitrochlorobenzene in the waste water of the conformation. Background technique [0002] Adsorption is a low energy consumption solid phase extraction separation technique. Adsorption is due to the residual surface energy of molecules or atoms on the solid surface due to unbalanced forces. When certain substances collide with the solid surface, they are attracted by these unbalanced forces and stay on the solid surface, 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...

Claims

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Application Information

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IPC IPC(8): C02F1/28
Inventor 郭照冰郑正郑寿荣江芳唐登勇袁守军张继彪陈立强吴文继
Owner NANJING UNIV
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