Nitha Mulungu
Nov 4
Production of nitric acid by ostwald process in step by step?
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Nov 4
The Ostwald process is a chemical process used for the production of nitric acid (HNO3) from ammonia (NH3). The process involves several steps:
1. Ammonia oxidation: In the first step of the Ostwald process, ammonia is oxidized to form nitric oxide (NO) in the presence of a platinum catalyst at high temperatures (around 850-900°C). The reaction is as follows:
4 NH3 + 5 O2 → 4 NO + 6 H2O
2. Nitric oxide oxidation: In the second step, the nitric oxide is further oxidized to form nitrogen dioxide (NO2) in the presence of excess oxygen. The reaction is as follows:
2 NO + O2 → 2 NO2
3. Absorption of nitrogen dioxide: The nitrogen dioxide is then absorbed in water to form nitric acid:
3 NO2 + H2O → 2 HNO3 + NO
4. Concentration of nitric acid: The nitric acid produced in the previous step is then concentrated by distillation to obtain the desired concentration of nitric acid.
Overall, the Ostwald process involves the oxidation of ammonia to nitric oxide, followed by the oxidation of nitric oxide to nitrogen dioxide, and finally the absorption of nitrogen dioxide in water to form nitric acid.
1. Ammonia oxidation: In the first step of the Ostwald process, ammonia is oxidized to form nitric oxide (NO) in the presence of a platinum catalyst at high temperatures (around 850-900°C). The reaction is as follows:
4 NH3 + 5 O2 → 4 NO + 6 H2O
2. Nitric oxide oxidation: In the second step, the nitric oxide is further oxidized to form nitrogen dioxide (NO2) in the presence of excess oxygen. The reaction is as follows:
2 NO + O2 → 2 NO2
3. Absorption of nitrogen dioxide: The nitrogen dioxide is then absorbed in water to form nitric acid:
3 NO2 + H2O → 2 HNO3 + NO
4. Concentration of nitric acid: The nitric acid produced in the previous step is then concentrated by distillation to obtain the desired concentration of nitric acid.
Overall, the Ostwald process involves the oxidation of ammonia to nitric oxide, followed by the oxidation of nitric oxide to nitrogen dioxide, and finally the absorption of nitrogen dioxide in water to form nitric acid.
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Google Gemini AI
Nov 4
Step 1: Preparation of Nitrogen Oxides (NOx)
- Ammonia is oxidized with air in the presence of a platinum catalyst:
```
4NH₃ + 5O₂ → 4NO + 6H₂O
```
- This reaction occurs in a platinum gauze reactor at about 800-900°C.
Step 2: Oxidation of Nitrogen Oxides (NOx)
- The nitrogen oxides produced in Step 1 are further oxidized with oxygen:
```
2NO + O₂ → 2NO₂
```
- This reaction takes place in a separate reaction chamber at room temperature.
Step 3: Absorption of Nitrogen Dioxide (NO₂) in Water
- The nitrogen dioxide produced in Step 2 is absorbed in water to form nitric acid:
```
3NO₂ + H₂O → 2HNO₃ + NO
```
- This reaction takes place in absorption towers packed with stoneware rings.
Step 4: Recovery of Nitrogen Oxide (NO)
- The nitric oxide (NO) produced in Step 3 is recycled to Step 2 to be re-oxidized.
Step 5: Concentration of Nitric Acid
- The dilute nitric acid produced in Step 3 is concentrated by distillation.
- The azeotropic composition of nitric acid is 68% HNO₃, which requires further concentration by other methods, such as vacuum distillation or extractive distillation.
- Ammonia is oxidized with air in the presence of a platinum catalyst:
```
4NH₃ + 5O₂ → 4NO + 6H₂O
```
- This reaction occurs in a platinum gauze reactor at about 800-900°C.
Step 2: Oxidation of Nitrogen Oxides (NOx)
- The nitrogen oxides produced in Step 1 are further oxidized with oxygen:
```
2NO + O₂ → 2NO₂
```
- This reaction takes place in a separate reaction chamber at room temperature.
Step 3: Absorption of Nitrogen Dioxide (NO₂) in Water
- The nitrogen dioxide produced in Step 2 is absorbed in water to form nitric acid:
```
3NO₂ + H₂O → 2HNO₃ + NO
```
- This reaction takes place in absorption towers packed with stoneware rings.
Step 4: Recovery of Nitrogen Oxide (NO)
- The nitric oxide (NO) produced in Step 3 is recycled to Step 2 to be re-oxidized.
Step 5: Concentration of Nitric Acid
- The dilute nitric acid produced in Step 3 is concentrated by distillation.
- The azeotropic composition of nitric acid is 68% HNO₃, which requires further concentration by other methods, such as vacuum distillation or extractive distillation.
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