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Oxidation method of sulfite or acidic sulfite or mixture thereof

A technology of acid sulfite and sulfite, applied in chemical instruments and methods, ammonia compounds, separation methods, etc.

Pending Publication Date: 2020-12-01
YUNNAN MINZU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the article "Research on the Oxidation Process of Ammonium Sulfite at High Concentration", Li Wei et al. pointed out that in high-concentration ammonium sulfite solution, although increasing the concentration of metal ion catalyst can increase the reaction rate, when the concentration of catalyst reaches a certain level, further Continue to increase the catalyst concentration, the rate increase is limited

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  • Oxidation method of sulfite or acidic sulfite or mixture thereof
  • Oxidation method of sulfite or acidic sulfite or mixture thereof

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Embodiment 1

[0071] A kind of oxidation method of sulfite, its concrete practice is:

[0072] A, preparation 2.0L molar concentration is the ammonium sulfite aqueous solution of 0.1mol / l, as water phase;

[0073] B. Add 0.8L of dodecane in the solution of step A as the organic phase;

[0074] C, pass into 20% oxygen in B step solution;

[0075] D. Control the pH of the step C solution at 6.0, the stirring speed is 500r / min, and react for 4.0h;

[0076] The upper solution in the heterogeneous solution of steps E and D is an organic solution containing dodecane, which is kept in the reactor and can be reused. The lower layer solution is an aqueous solution containing ammonium sulfate, which can be released from the bottom of the reaction kettle.

[0077] F. Under the condition that the pH is 6.0 and the temperature is 90° C., the ammonium sulfate aqueous solution in the E step is concentrated and crystallized. The crystals in saturated ammonium sulfate aqueous solution were separated by ...

Embodiment 2

[0080] A kind of oxidation method of sulfite, its concrete practice is:

[0081] A, preparation 2.0L molar concentration is the ammonium sulfite aqueous solution of 3.0mol / l, as water phase;

[0082] B. Add 2.0L of pentadecane in the solution of step A as the organic phase;

[0083] C, pass into 90% oxygen in B step solution;

[0084] D, the pH of the C step solution is controlled at 6.5, the stirring speed is 800r / min, and the reaction is 8.0h;

[0085] The upper solution in the heterogeneous solution of steps E and D is an organic solution containing pentadecane, which is kept in the reactor and can be reused. The lower layer solution is an aqueous solution containing ammonium sulfate, which can be released from the bottom of the reaction kettle.

[0086] F. Under the condition that the pH is 7.0 and the temperature is 70° C., the ammonium sulfate aqueous solution in the E step is concentrated and crystallized. The crystals in saturated ammonium sulfate aqueous solution ...

Embodiment 3

[0089] A kind of oxidation method of sulfite, its concrete practice is:

[0090] A, preparation 2.0L molar concentration is the ammonium sulfite aqueous solution of 4.0mol / l, as water phase;

[0091] B. Add 1.0L of dodecane and 1.0L of pentadecane to the solution in step A as the organic phase;

[0092] C, feed 100% oxygen in the B step solution;

[0093] D. Control the pH of the step C solution at 7.0, the stirring speed is 1200r / min, and the reaction is 8.0h;

[0094] The upper solution in the heterogeneous solution of E and D steps is an organic solution containing dodecane and pentadecane, which is kept in the reactor and can be reused. The lower layer solution is an aqueous solution containing ammonium sulfate, which can be released from the bottom of the reaction kettle.

[0095] F. Under the condition that the pH is 6.5 and the temperature is 75° C., the ammonium sulfate aqueous solution in the E step is concentrated and crystallized. The crystals in saturated ammon...

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Abstract

The invention provides an oxidation method of sulfite or acidic sulfite or a mixture thereof. The oxidation method comprises the following steps: introducing oxygen into an organic solution capable ofdissolving oxygen to oxidize an aqueous solution of sulfite or acidic sulfite or a mixture thereof, thereby preparing a sulfate product. The method is high in oxidation rate, can be applied to a comprehensive treatment technology of flue gas discharged in the coal industry, the petrochemical industry, the thermal power plant, the smelting industry and the like, and particularly relates to a post-treatment technology of flue gas desulfurization products and treatment of sulfite-containing wastewater generated in the industries of pesticides, printing and dyeing and the like. The method is lowin production equipment investment, energy-saving, time-saving, low in cost and convenient to operate, and can be applied to oxidation of sulfite aqueous solutions with different concentrations.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a method for oxidizing sulfite or acid sulfite into sulfate, which can be applied to the synthesis of flue gas discharged from coal industry, petrochemical industry, thermal power plant, smelting industry, etc. Treatment technology, especially related to the post-treatment technology of flue gas desulfurization products and the treatment of sulfite-containing wastewater produced by pesticide, printing and dyeing industries. Background technique [0002] In order to reduce the serious environmental pollution related to sulfur dioxide and the damage to human health, many countries have attached great importance to the emission of sulfur dioxide, and legally require the emission of sulfur dioxide from such as boilers burning coal and fossil fuels, smelters, thermal power plants, sulfuric acid Harmless treatment of sulfur dioxide emitted from manufacturing plants...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01D53/73B01D53/18C05C3/00C01C1/247C02F103/18C02F101/10
CPCC02F1/72B01D53/73C05C3/00C01C1/247C02F2103/18C02F2101/101Y02P20/10
Inventor 黄相中田凯李艳红李育晓李育逵
Owner YUNNAN MINZU UNIV
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