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Nanometer vanadium catalyst for preparing sulfuric acid through oxidizing SO2 and preparation method thereof

A sulfur dioxide, oxidation technology, applied in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of high ignition temperature, difficult reaction control, etc., achieve high low temperature activity, easy control of reaction temperature, The effect of improving thermal stability

Active Publication Date: 2013-12-18
南京云高新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the shortcomings of the prior art that the reaction is not easy to control and the ignition temperature is high, the present invention provides a nano-vanadium catalyst for sulfur dioxide oxidation to sulfuric acid and its preparation method. The reaction is mild, and the catalyst has high activity and high stability under low temperature conditions. Sexual, able to reduce tail gas SO 2 emissions

Method used

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  • Nanometer vanadium catalyst for preparing sulfuric acid through oxidizing SO2 and preparation method thereof
  • Nanometer vanadium catalyst for preparing sulfuric acid through oxidizing SO2 and preparation method thereof
  • Nanometer vanadium catalyst for preparing sulfuric acid through oxidizing SO2 and preparation method thereof

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Effect test

Embodiment 1

[0042] Sample composition: V 2 o 5 4%, 0.01% of cerium nitrate, 1% of cesium hydroxide, 0.01% of lanthanum nitrate, 0.5% of surfactant hexadecyltrimethylammonium bromide and 0.7% of organic macromolecular compound polyethylene glycol, and the rest is refined silicon algal earth.

[0043] Using the traditional production process, the diatomite is separated by water, treated with acid, filtered, washed and dried to obtain refined diatomite for use. will V 2 o 5 , KOH are fully dissolved in the same reaction tank, after mixing evenly, add organic polymer compounds and surfactants, and fully react to obtain KVO 3 or NaVO 3 solution; while stirring, the solution and CsOH, lanthanum nitrate, and cerium nitrate are added dropwise to dilute sulfuric acid in a downstream manner, wherein the mass percentage concentration of dilute sulfuric acid is 50%, and the pH value is controlled to be 2 to 4. The neutralization temperature 25°C, at this time, the V produced by the reaction o...

Embodiment 2

[0045] Sample composition: V 2 o 5 5.5%, cerium oxide 5%, cesium sulfate 10%, lanthanum oxide 5%, surfactant sodium dodecylbenzenesulfonate, sodium dodecylsulfonate 0.5% each and organic polymer polypyrrolidone 0.5%, Carboxymethyl cellulose is 0.5%, and the rest is refined diatomaceous earth.

[0046] will V 2 o 5 , NaOH is added to the reaction tank to dissolve organic polymer compounds and surfactants, and fully react to obtain NaVO 3 Solution b; while stirring, drop solution b into dilute sulfuric acid in a downstream manner, control the pH value to 2-4, and control the neutralization temperature to 20°C, and react to form nano-scale homogeneous liquid B, in which the dilute sulfuric acid mass The percentage concentration is 70%; the solution B is quickly and evenly sprayed into the refined diatomite in the form of spray, and fully mixed with sodium sulfate, phosphoric acid, lanthanum oxide, cesium sulfate, cerium oxide, and sulfur into the roller. Grinding for 0.5 h...

Embodiment 3

[0048] Sample composition: V 2 o 5 4.5%, cerium nitrate 2.5%, cesium hydroxide 6%, lanthanum nitrate 2.55%, surfactant triethanolamine dodecyl sulfate 1%, organic polymer polystyrene 2%, polyoxyethylene 2%, the rest is Refined diatomaceous earth.

[0049] will V 2 o 5 , KOH is dissolved in the reaction tank, after mixing evenly, add organic polymer compound and surfactant, fully react to get KVO 3 Solution c; while stirring, add solution c, soluble cesium-containing compounds such as CsOH, lanthanum-containing compounds such as lanthanum nitrate or cerium-containing compounds such as cerium nitrate into dilute sulfuric acid in a downstream manner, and control the pH value of 2~ 4. Control the neutralization temperature to ≤30°C, and react to form nano-scale homogeneous liquid C, in which the mass percentage concentration of dilute sulfuric acid is 20-70%; quickly and evenly spray solution C into refined diatomite in the form of spray, And add sodium sulfate, phosphoric ...

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Abstract

The invention relates to a nanometer vanadium catalyst for preparing sulfuric acid through oxidizing SO2 and a preparation method thereof. The nanometer vanadium catalyst which uses diatomite as a carrier to load V2O5 contains cesium oxide and lanthanum oxide, and raw materials of the nanometer vanadium catalyst comprise, by mass, 4-5.5% of V2O5, 0.01-5% of a cerium-containing compound, 1-3% of a thiosulfate, 1-10% of a cesium-containing compound, 0.01-5% of a lanthanum-containing compound, and 0.5-7% of a surfactant and an organic macromolecular compound. According to the finished nanometer vanadium catalyst, V2O5 is nanometer grade V2O5; the ignition temperature is 340-350DEG C; the operation temperature of the catalytic reaction is 360-370DEG C; and the SO2 volume concentration is 3-12%, the total conversion rate is equal to or greater than 99.7% and the SO2 emptying amount is equal to or less than 400mg / m<3> when the catalytic reaction adopts a 3+2 flow of a converter. The prepared catalyst has the advantages of low ignition temperature, high activity, high use stability, good compressive strength, and low abrasion.

Description

technical field [0001] The invention belongs to a vanadium catalyst for oxidizing sulfur dioxide to sulfur trioxide in the production of sulfuric acid, in particular to a nano-vanadium catalyst for sulfuric acid oxidation by low-temperature sulfur dioxide oxidation and a preparation method thereof. Background technique [0002] The production of vanadium sulfate catalyst in my country has a history of several decades. For a long time, the following process steps have been used: ① Wash with water and boil diatomite with dilute sulfuric acid to remove Fe in diatomite. 2 o 3， al 2 o 3 and other impurities, so that SiO 2 The content reaches more than 85%wt; ② put V 2 o 5 React with KOH solution to make it into KVO 3 Solution; ③KVO 3 The solution and concentrated sulfuric acid are added dropwise into water, and a jelly is formed after the neutralization reaction. In this step, concentrated sulfuric acid is used, so when the concentrated sulfuric acid is added to water, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053C01B17/79
Inventor 秦益鹏路前文王明钦沈悦欣朱卫冬
Owner 南京云高新型材料有限公司
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