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System and process for preparing nitric acid from high-concentration NOX industrial tail gas based on micro-interface enhancement

A technology of industrial tail gas and concentrated nitric acid, applied in the directions of nitrogen oxides/oxyacids, nitric acid, nitric oxide, etc., can solve the problems of many treatment equipment and poor treatment effect, and achieve enhanced mass transfer, increase conversion rate, increase The effect of a large contact area

Inactive Publication Date: 2021-03-12
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The treatment of high-concentration nitrogen oxides in industrial tail gas emissions is an important step in the production process, and there are often problems with poor treatment effects and many treatment equipments

Method used

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  • System and process for preparing nitric acid from high-concentration NOX industrial tail gas based on micro-interface enhancement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Nitric acid production is carried out using the system and process described above, wherein:

[0102] The strong oxidizing solution is hydrogen peroxide with a concentration of 80%.

[0103] The NO X The temperature in the oxidation tank is 10°C and the pressure is 0.1MPa.

[0104] The temperature of the cooler is 20° C., and the gas-liquid ratio in the micro-interface generator is 700:1.

[0105] The reaction temperature in the reactor is 20° C., and the reaction pressure is 0.1 MPa.

[0106] The circulating cooling water flowing into the cooling jacket should have a temperature of 10°C.

[0107] After testing, after using the system and process, the oxidation rate of nitric oxide is 99%, and the conversion rate of nitric acid is 65.0%.

[0108] The reaction time is 7h.

Embodiment 2

[0110] Nitric acid production is carried out using the system and process described above, wherein:

[0111] The strong oxidizing solution is hydrogen peroxide with a concentration of 80%.

[0112] The NO X The temperature in the oxidation tank is 10°C and the pressure is 0.1MPa.

[0113] The temperature of the cooler is 20° C., and the gas-liquid ratio in the micro-interface generator is 700:1.

[0114] The reaction temperature in the reactor is 20° C., and the reaction pressure is 0.1 MPa.

[0115] The circulating cooling water flowing into the cooling jacket should have a temperature of 10°C.

[0116] After testing, after using the system and process, the oxidation rate of nitric oxide is 99%, and the conversion rate of nitric acid is 65.0%.

[0117] The reaction time is 7h.

Embodiment 3

[0119] Nitric acid production is carried out using the system and process described above, wherein:

[0120] The strong oxidizing solution is potassium dichromate solution with a concentration of 80%.

[0121] The NO X The temperature in the oxidation tank is 10°C and the pressure is 0.1MPa.

[0122] The temperature of the cooler is 20° C., and the gas-liquid ratio in the micro-interface generator is 700:1.

[0123] The reaction temperature in the reactor is 20° C., and the reaction pressure is 0.1 MPa.

[0124] The circulating cooling water flowing into the cooling jacket should have a temperature of 10°C.

[0125] After testing, after using the system and process, the oxidation rate of nitric oxide is 98%, and the conversion rate of nitric acid is 64.0%.

[0126] The reaction time is 7h.

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Abstract

The invention relates to a system and a process for preparing nitric acid from high-concentration NOX industrial tail gas based on micro-interface enhancement. The system comprises a NOX industrial tail gas pretreatment unit, a concentrated nitric acid generator, a micro-interface generator and the like. According to the invention, the micro-interface generator crushes NOX industrial tail gas to form micron-scale bubbles, the micron-scale bubbles are output into the NOX oxidation tank to be mixed with a strong oxidizing solution to form a gas-liquid mixture after crushing is completed, the micron-scale bubbles have physicochemical properties which conventional bubbles do not have, and according to the calculation formula of the sphere volume and the surface area, the total surface area ofthe bubbles is inversely proportional to the diameter of a single bubble under the condition that the total volume is not changed, so that the total surface area of the micron-scale bubbles is huge, the micron-scale bubbles and the strong oxidizing solution are mixed to form the gas-liquid mixture, the gas-liquid two-phase contact area is increased, the mass transfer effect is enhanced, the conversion rate of nitrogen dioxide is effectively improved, a reaction gas source is provided for preparing nitric acid, and waste is effectively utilized.

Description

technical field [0001] The invention relates to the technical field of nitric acid preparation, in particular to a high-concentration NO based on micro-interface strengthening X A system and process for preparing nitric acid from industrial tail gas. Background technique [0002] Nitrogen oxides are compounds composed only of nitrogen and oxygen. Common nitrogen oxides are nitric oxide, nitrogen dioxide (reddish brown), dinitrogen monoxide, dinitrogen pentoxide, etc., except dinitrogen pentoxide, which is solid in normal state, and other nitrogen oxides are in gaseous state in normal state. Nitrogen oxides (NOx) as air pollutants often refer to nitrogen monoxide and nitrogen dioxide. Except for nitrogen monoxide and nitrogen dioxide, other nitrogen oxides are extremely unstable and become nitrogen dioxide and nitrogen dioxide when exposed to light, humidity or heat. Nitric oxide, nitric oxide turns into nitrogen dioxide, and nitrogen oxides are toxic to varying degrees, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/40C01B21/24C01B21/36
CPCC01B21/24C01B21/36C01B21/40
Inventor 张志炳高亚男周政孟为民王宝荣杨高东罗华勋张锋李磊杨国强田洪舟曹宇
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD
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