Catalytic wet oxidation method of flue gas desulfurization waste liquor

A technology for catalyzing wet oxidation and desulfurization waste liquid, which is applied in the direction of oxidized water/sewage treatment, gaseous effluent wastewater treatment, etc. It can solve the problems of inability to overcome catalyst loss, inability to solve Cu loss, and failure to solve it well, so as to speed up Oxidation reaction speed, high oxidation treatment performance, effect of equipment scale reduction

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101185887 provides a catalyst for wet oxidation process, with γ-Al 2 o 3 As the carrier, transition metal Mn, rare earth oxide CeO 2 and La 2 o 3 As an active component, the catalyst can reduce the amount of expensive noble metal materials, and to a certain extent reduce the loss of transition metal elements such as copper and iron, but the carrier is prone to crystal transformation during the reaction, resulting in catalyst deactivation
U.S. Patent US5360552 adopts CuO/Al 2 o 3 , CuS/activated carbon, Cu/X molecular sieve as wet oxidation catalyst, COD removal rate is high, but sti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1 (preparation of catalyst carrier)

[0024] Preparation of catalyst carrier TOS-1: 40g nano-titanium dioxide (average particle size 30nm), 15g pseudo-boehmite, 2g 65% nitric acid, 25g distilled water, 3g cyanine powder, knead, and extrude on a twin-screw extruder Forming treatment, the formed carrier was dried in the air for 24 hours, dried at 120°C for 12 hours, and then calcined at 500°C for 12 hours to obtain cylindrical TiO 2 Vector TOS-1.

[0025] Preparation of catalyst carrier TOS-2: 40g of non-nano titanium dioxide (conventional titanium dioxide material, with an average particle size of about 450nm) and 15g of pseudoboehmite, 2g of 65% nitric acid, 25g of distilled water, 3g of succulent powder, kneaded, The extrusion molding process was carried out on a screw extruder, and the molding carrier was dried in the air for 24 hours, dried at 120 °C for 12 hours, and then calcined at 500 °C for 12 hours to obtain cylindrical TiO 2 Vector TOS-2.

Example Embodiment

[0026] Example 2 (the preparation of the catalyst used in the method of the present invention)

[0027] The TOS-1 carrier was immersed in a mixed aqueous solution of cerium nitrate and chloroplatinic acid by the immersion method, the loading amount was Ce 4%, Pt 0.2%, the immersion time was 0.1h, and then dried in the shade for 20 hours, and then in an air atmosphere Drying at 120 °C for 12 hours in the oven, and finally placed in a muffle furnace at 550 °C for 5 hours under air atmosphere, to obtain catalytic wet oxidation catalyst A.

Example Embodiment

[0028] Example 3 (preparation of catalyst used in the method of the present invention)

[0029] The TOS-1 carrier was immersed in the mixed aqueous solution of lanthanum nitrate and ruthenium chloride by the dipping method, the loading amount was La 5%, Ru 0.2%, the immersion time was 0.2h, and then dried in the air with a certain humidity for 20 hour, then dried in an air oven at 80° C. for 12 hours, and finally placed in a muffle furnace for 3 hours at 600° C. in an air atmosphere to obtain catalytic wet oxidation catalyst B.

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Abstract

The invention relates to a catalytic wet oxidation method of flue gas desulfurization waste liquor. In the presence of a catalyst, flue gas desulfurization waste liquor contacts air to oxidate sulfite into sulfate, wherein the catalyst uses nano TiO2 as a supporter, the active component of the catalyst is one or more of noble metal elements Pt, Pd, Ru and Rh, and the assistant is one or more of rare earth metal elements La, Ce, Pr and Nd. The catalyst comprises the following components in percentage by weight: 0.05-0.5% of noble metal element and 1-10% of rare earth metal element. The mass ratio of the rare earth metal element to the noble metal element is 10-200. By adopting the proper catalyst, the method provided by the invention lowers the cost of the catalyst on the premise of enhancing the reactivity; and the catalyst has the advantages of high stability and no secondary pollution.

Description

technical field [0001] The invention relates to a treatment method for flue gas desulfurization waste liquid, in particular to a method for treating flue gas desulfurization waste liquid by using a catalytic wet oxidation method. Background technique [0002] In the treatment process of flue gas desulfurization, wet flue gas desulfurization technology is mostly used at home and abroad. The principle is to use alkaline materials as absorbents to absorb SO in the absorption tower. 2 The flue gas is spray scrubbed to make SO 2 React with absorbent to generate sulfite and sulfate. In this process, the oxidation of sulfite is an important process in the treatment of desulfurization waste liquid. Due to the slow process of sulfite oxidation, after the waste liquid is directly oxidized by air Still containing too much sulfite ion makes it difficult for wastewater COD to meet the discharge standard. Improving the oxidation efficiency of sulfite through appropriate methods is of gr...

Claims

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Application Information

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IPC IPC(8): C02F1/74C02F103/18
Inventor 程明珠王学海刘忠生杨英
Owner CHINA PETROLEUM & CHEM CORP
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