Ostwald Process
Definition and meaning of Ostwald Process in chemistry.
The Ostwald Process is a famous industrial method used to make liquid nitric acid. Factories mix basic ammonia gas with pure oxygen gas to start this chemical change. This massive industrial step is completely necessary for making global farming fertilizers and explosives.
In more detail
This famous manufacturing process happens in two separate stages inside a large chemical factory. First, workers pump hot ammonia gas (NH3) and oxygen (O2) over a metal screen. This metal screen is made from a highly expensive mix of platinum and rhodium.
The extreme heat and the metal catalyst force the two gases to react together. This first step creates a new chemical called nitric oxide and plain water vapor. Next, the factory cools the hot nitric oxide and mixes it with more oxygen.
This extra oxygen turns the chemical into a heavier brown gas called nitrogen dioxide. Finally, this brown gas is bubbled through giant tanks of water to create the acid. The resulting liquid is the highly useful nitric acid needed by many other industries.
Students often mix this up with the Haber-Bosch process which makes the starting ammonia. These two famous chemical processes actually work perfectly together in a grand industrial chain. The first factory makes the ammonia and the second factory turns it into acid.
Key facts
| Field | Inorganic Chemistry |
|---|---|
| Compound Formula | HNO3 |
| Catalyst | Platinum-Rhodium alloy |
| Starting materials | Ammonia gas and oxygen gas |
| Operating temperature | Roughly 800 degrees Celsius |
A modern chemical plant runs this entire process at roughly eight hundred degrees Celsius. The platinum metal screen glows a bright cherry red from the extreme internal heat. The factory must capture all the brown nitrogen dioxide gas before it escapes outside. If this heavy brown gas escapes, it creates terrible toxic smog in the local city. Engineers carefully control the water tanks to make the final acid extremely concentrated. They ship this strong acid in special train cars to giant fertilizer mixing plants.
Frequently asked questions
Why does the Ostwald process need such an expensive platinum metal catalyst?
The ammonia and oxygen simply will not react together fast enough on their own. The platinum surface gives the gases a perfect resting spot to break their bonds.
What is the main industrial use for all of this liquid nitric acid?
Most of the global supply goes directly into making solid nitrogen fertilizers for farms. A smaller portion is used to manufacture military explosives and heavy mining chemicals.
How is the Ostwald process connected to the famous Haber-Bosch chemical process?
The Haber-Bosch process pulls nitrogen from the air to build the ammonia gas. The Ostwald process then uses that exact same ammonia to build the nitric acid.