A method for the reuse and treatment of acidic wastewater produced by the preparation of titanium-silicon molecular sieves

A titanium-silicon molecular sieve, acid wastewater technology, applied in ion-exchange water/sewage treatment, natural water treatment, water/sewage treatment, etc., can solve the problem of excessive sulfuric acid-hydrogen peroxide mixture, environmental pollution of waste acid, and safety risks and other problems, to achieve the effect of avoiding emission and post-treatment process, good adsorption performance and long service life

Active Publication Date: 2020-09-04
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the washing process, more sulfuric acid-hydrogen peroxide mixture is used, and the discharge of waste acid after washing has caused serious environmental pollution and safety risks.

Method used

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  • A method for the reuse and treatment of acidic wastewater produced by the preparation of titanium-silicon molecular sieves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation process of the regeneration medium: take 100g of hydrogen-type strong acid gel-type styrene-based cation exchange resin with a dry weight of 100g, take 100g of granular activated carbon, mix them evenly, and slowly heat to 200°C in a nitrogen atmosphere to make the hydrogen-type strong acid gel Colloidal styrene-based cation exchange resin is partially carbonized, and the obtained dark brown partial carbide is impregnated with saturated sodium silicate solution and dried at 60°C for 2 hours, then washed with 1600ml of 1.0mol / L dilute hydrochloric acid solution and loaded Packed column as regeneration medium.

[0038] The recovery and treatment process of acidic waste liquid: take 300g of the acidic waste water collected in the above comparative example 2, according to 2h -1 The space velocity is continuously injected from the upper end of the packed column for regeneration treatment, and the filtrate obtained after regeneration treatment, that is, the re...

Embodiment 2

[0042]The preparation process of the regeneration medium: take 50g of hydrogen-type strongly acidic gel-type styrene-based cation exchange resin with a dry weight of 50g, take 150g of granular activated carbon, mix evenly, and slowly heat to 200°C in a nitrogen atmosphere to make hydrogen-type strong acid gel Colloidal styrene-based cation exchange resin is partially carbonized, and the obtained dark brown partial carbide is impregnated with saturated sodium silicate solution and dried at 60°C for 2 hours, then washed with 1600ml of 0.5mol / L dilute hydrochloric acid solution and loaded Packed column as regeneration medium.

[0043] The recovery and treatment process of acidic waste liquid: take 300g of the acidic waste water collected in the above comparative example 2, according to 0.5h -1 The space velocity is continuously injected from the upper end of the packed column for regeneration treatment, and the filtrate obtained after regeneration treatment, that is, the recovere...

Embodiment 3

[0047] The preparation process of the regeneration medium: take a hydrogen-type strong acid gel-type styrene-based cation exchange resin with a dry weight of 150g, take 50g of granular activated carbon, mix them evenly, and slowly heat to 250°C in a nitrogen atmosphere to make the hydrogen-type strong acid gel. Colloidal styrene-based cation exchange resin is partially carbonized, and the obtained dark brown partial carbide is impregnated with saturated sodium silicate solution and dried at 100°C for 0.5h, then washed with 2400m1.5mol / L dilute hydrochloric acid solution and loaded into a packed column as a regeneration medium.

[0048] The recovery and treatment process of acidic waste liquid: take 300g of the acidic waste water collected in the above comparative example 2, according to 5h -1 The space velocity is continuously injected from the upper end of the packed column for regeneration treatment, and the filtrate obtained after regeneration treatment, that is, the recove...

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Abstract

The invention provides a method for reusing acidic wastewater from the preparation of titanium-silicon molecular sieves; the method comprises the steps of (1) preparing a regenerating medium; (2) filling a packing column with the regenerating medium prepared in step (1); (3) filling the packing column continuously with acidic wastewater to obtain a reclaimed liquid; in the method for reusing acidic wastewater from the preparation of titanium-silicon molecular sieves, cation exchange resin and activated carbon are used to prepare a regenerating medium to treat acidic wastewater for reuse, titanium-silicon molecular sieves washed with the reclaimed liquid have high catalytic activity, and less hydrogen peroxide in catalytic reaction is degraded; in addition, the method of the invention reuses sulfuric acid solvents from the preparation of titanium-silicon molecular sieves, resources are saved, pollution is decreased, and wastewater emission and posttreatment are avoided.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of acidic wastewater, and in particular relates to a recycling treatment method for acidic wastewater produced by the preparation of titanium-silicon molecular sieves. Background technique [0002] TS-1 titanium-silicon molecular sieve is a transition metal heteroatom molecular sieve with MFI structure containing titanium atoms. site pair H 2 o 2 It has unique adsorption and activation properties, so it has high catalytic oxidation activity in various organic compound reactions, high product selectivity, mild reaction conditions, and no pollution emissions during the entire catalytic oxidation process. It has good application prospects as a catalyst, such as its Catalytic hydroxylation of phenol to o-(hydro)quinone and ammoximation of cyclohexanone to cyclohexanone oxime have all been applied industrially. [0003] The main disadvantage of TS-1 titanium-silicon molecular sieve is that most of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01B39/08C02F103/34
CPCC01B39/085C02F1/283C02F1/42C02F2001/425C02F2103/34
Inventor 温贻强王向宇王妍妍魏会娟刘猛
Owner ZHENGZHOU UNIV
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