Release that Witch

378. Chapter 378 Oxygen and Nitrogen

    The trial was not only of great practical significance, but also an excellent educational opportunity, so in addition to participants Agatha, Silvy, James and Cam Schuire, Roland called all other Witch Union members, Carter, Iron Axe and Barov. Come over, in order to accommodate these twenty people, the test site was selected in the fifth largest laboratory.

    For the first time, the fractionation vessel was not made too large, about one person tall, one meter in diameter, similar to a tower. The inside of the container is divided into three layers, the bottom layer is air intake, and the upper two layers are used for exhausting.

    Before the separation began, Roland first gave everyone a simple chemistry class, telling them what might happen, and asked a few small questions to let everyone find the answer themselves – in addition to being able to attract the audience’s interest, It can also greatly enhance the effectiveness of teaching, which is also the skill that chemistry teachers are used to.

“……In theory, when Agatha lowers the internal temperature of the container, the air gradually condenses into a liquid, which passes through the perforated partition and drops to the bottom. So tell us when you observe that there is fluid at the bottom. ”

    Since it is not possible to visualize directly, Silvy must be observed through the container to describe the changes, so Roland is particularly detailed in this section.

    Silvy nodded in the suspicious position. “Can you really see the liquid appear? Wouldn’t it be the water vapor in the jar? ”

    “Reassured, the liquid air is light blue, completely different from water vapor.”Roland waved, “and at that temperature, the water vapor has solidified into ice crystals.”Then he gestured to Agatha, “Get started.”

    “WaitIsn’t the hole at the bottom of the container blocked? ”she asked.

    “There will be some more blocking, otherwise the air in the jar is too small, and no obvious changes can be observed.”Because it was only a test, Roland chose the easiest way to inhale – as the temperature inside the tank quickly drops, the pressure will drop, causing the outside air to flow into the tank. In normal production, this is not worth the effort, because cold air will be lost and energy is wasted, but Agatha uses magic power, and the cooling efficiency is far more than any refrigerator, so Roland is too lazy to prepare the air pump to inflate.

    Agatha take a deep breath and press the both hands on the fractionation tower.

    Between the figures and the numbers, there is a howling sound in the intake pipe, which is the sound of the rapid influx of airflow. A layer of hoarfrost emerges at a speed visible to the naked eye around the nozzle and is constantly expanding – the moisture in the air quickly condenses at the low temperature of the overflow and adheres to the outer wall of the container. Anna turned black into a silk thread and cleaned up the ever-increasing ice crystals.

    In a short while, Silvy said with amazement, “I saw liquid on the partition, but more white cream.”

    “White condensate may be influx of water vapor, or it may be crystalline carbon dioxide,” Roland explains. “Considering the extremely low levels of carbon dioxide in the air, most of it should be water vapor.”

    If it is officially produced, the air must be dried before being pumped into the fractionation tower. Otherwise, the water vapor will easily block the layered plates and the vent holes after condensation, resulting in reduced production efficiency.

    After about a quarter of an hour, Silvy reported that the bottom of the container had been filled with blue liquid, and Roland allowed Soraya to block the intake manifold and seal it with a coating.

    The next step is the critical warming.

    According to the different boiling points of nitrogen and oxygen, nitrogen will first reach the boiling point, and the gas will escape upwards, thereby achieving separation. At this temperature, he does not remember the specific value. At present, there is no means to measure it. It can only be grasped by Agatha himself. The specific performance is that the gas in the vent hole at the top of the fractionation column is discharged, and the liquid remaining at the bottom is bluer, which means that the purity of liquid oxygen is increasing.

    Fortunately, Agatha is no stranger to the control of magic power. She precisely adjusts the temperature drop and makes it slowly rise. In a short while, Silvy also observed the liquid boiling phenomenon. Bubbles began to appear in the coated tubes that passed into the water, and Cam quickly collected several bottles of gas using the drainage gas collection method.

    “Is this nitrogen?”Lily snorted. “I can’t see anything at all.”

    “This is the first question I mentioned before,” Roland asked. “How to prove that it is different from the air?”

    “Ignite,” Tilly took the initiative to answer. “«Elementary Chemistry» says that oxygen is needed for combustion. If it is another gas, it should extinguish the burning wood.”

    “It’s known to re-cool it into a liquid,” Agatha said after a moment of thinking. “Don’t you say that nitrogen is colorless after liquefaction?”

    “Or the liquid left in the container to prove that the latter is pure oxygen can also prove the diversity of air composition.”Anna started.

    The scene completely became the stage for the performance of the school, one test method was proposed, and then discussed with each other, only a few people in the lab. Looking around for a week, Roland found a bitch of Nightingale, Andrea, Macy, and the City Hall Premier Minister and Chief Knight Carter. The First Army commander Iron Axe maintains an expression at all times, and no matter what he says, he will nod his head.

    Well, Roland sighed at the bottom of heart, it seems that this chemistry class is a bit superb.

    If there are still people who can feel the joy of His Royal Highness, I am afraid that only Cam Schuire and James will be left.

    “His Royal Highness, this is really…Magical,” the young alchemist exclaimed. “You have proven the correctness of «Elementary Chemistry». I am afraid that all alchemists will not expect it, and the air that is everywhere can be so complicated. ”

    “With pure oxygen, can you observe a more intense oxidation reaction? I have a lot of experiments to do,” Cam said excitedly.

    Roland nodded, but suddenly there was another idea in his heart.

    Nitrogen is the most important raw material for synthetic ammonia. It can react with hydrogen under high temperature and high pressure plus catalyst to obtain ammonia gas. The latter can be used not only to produce nitrogen fertilizer, but also to synthesize nitrogen oxides to produce nitric acid. There are many things that need to be done to achieve this process, such as air pumps, vacuum storage tanks and a series of complex reaction equipment. Even if White Paper can provide the function of a catalyst, it needs to be tested repeatedly.

    Now, since he has pure oxygen and pure nitrogen, why not directly produce nitric oxide?

    It is true that the chemical industry chooses to use ammonia to produce nitric acid, which means that the oxygen and nitrogen reactions are energy-absorbing reactions that cannot be carried out spontaneously. It is necessary to supply external energy, such as discharge, which is achieved by heating the gas to thousands of degrees in an instant by the arc. The reason why the soil is often more fertile in places where thunder is often used. Because of this, this method is high in equipment and energy consumption, so it is not suitable for formal production.

    If the production capacity is urgently needed, this production method is the most efficient, and even the catalyst is not needed, only the continuous discharge is used……Or use other means to achieve the high temperature generated by the arc.

    Roland naturally thought of a black fire.

    The black fire heating efficiency is not worse than the arc, and the burden on Anna is extremely low. As long as the nitrogen and oxygen are purified, and the mixture is poured into the closed reactor in proportion, the nitrogen monoxide can be continuously generated.

    He decided to try it this way.

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