Release that Witch

The trial was not only of great practical significance, but also an excellent educational opportunity, so in addition to the participants Ai Gesha, Sylvie, Chamez and Kemer Stern, Roland put the other members of the Witch Alliance, Carter, Axe and Barov also called over. In order to accommodate these twenty people, the test site was selected in the fifth laboratory with the largest space.

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, told them what might happen, and put along a few small questions, so that everyone can find the answer by themselves, in addition to hooking the audience's interest, but also Greatly enhance the effect of teaching, which is also the skill that chemistry teachers are used to.

"...In theory, when Aisha lowers the internal temperature of the container, the air will gradually condense into a liquid, passing through the perforated partition and dripping to the bottom. So when you observe that there is fluid at the bottom, tell us."

Since it is impossible to visualize directly, it is necessary to observe the changes through the observation of the container through Hilvey, so Roland is particularly detailed in this part.

Sylvie will nod his head in doubt. "Can you really see the liquid? Is it not 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 Ai Gesha, "then let's start."

"Wait... the hole at the bottom of the container doesn't need to be blocked?" she asked.

"There will be some more blocking, otherwise the air in the jar is too small, and no obvious change can be observed." Because it is only a test, Roland chose the easiest way to inhale. When the temperature inside the tank is rapidly reduced, the pressure will follow. The lowering of the air causes the outside air to constantly flow into the tank. In normal production, this is not worth the loss, because the air-conditioning will continue to be lost, wasting energy, but Ai Gesha uses magic, and the cooling efficiency is far more than any refrigerator, so Roland is too lazy to prepare the air pump to inflate.

Ai Gesha took a deep breath and pressed her hands on the fractionation tower.

Between the figures and the statistics, there is a howling sound in the intake pipe, which is the sound of the rapid influx of airflow. Layers of hoarfrost appear at a speed visible to the naked eye around the nozzle, and the moisture in the air is continuously enlarged and rapidly condensed at the low temperature of the overflow, and attached to the outer wall of the container. Anna turned the black fire into a thread and cleaned up the ever-increasing ice crystals.

In a short while, Sylvie said with surprise, "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 explained. “Considering the extremely low levels of carbon dioxide in the air, most of it should be water vapor.”

If it is officially produced, before the air is drawn into the fractionation tower, it must be dried first. Otherwise, the water vapor will easily block the layered plate and the vent hole after condensation, which will reduce the production efficiency.

After about a quarter of an hour, Sylvie reported that the bottom of the container had been filled with blue liquid, and Roland let Soloya block the intake pipe and seal it with a coating.

Next is the key 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 Ai Gesha himself. The specific performance is that the vent hole at the top of the fractionation column has gas discharge, and the remaining liquid at the bottom will become bluer, which means that the purity of liquid oxygen is continuously increasing.

Fortunately, Ai Gesha is no stranger to the control of the magic. She accurately adjusts the cooling rate to make it slowly rise. In a short while, Hilli also observed the boiling of the liquid surface. Bubbles began to appear in the coated tubes that passed into the water, and Kaimo quickly collected several bottles of gas using the drainage gas collection method.

"Is this nitrogen?" Lily whispered. "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 answered first. “Primary Chemistry says that combustion requires oxygen. If it is another gas, it should cause the burning wood to extinguish instantly.”

"I know it by re-cooling it into a liquid," Ai Gesha said after a moment. "Don't you say that nitrogen is colorless after liquefaction?"

"Or export the liquid left in the container to prove that the latter is pure oxygen can also prove the diversity of air composition." Anna began.

The scene completely became the stage for the performance of the school, one test method was proposed, and then discussed with each other, there are only a few people in the lab. Roland looked around for a week and found that the night witch, Andrea, McMillan and other witches, as well as the town hall chief and chief knight Carter, were all awkward. The First Army commanded the Iron Axe to maintain an expression at all times, and no matter what he said, he would nod and say yes.

Well, Roland sighed in the bottom of his 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 Kemer Stern and Chames are left.

"His Royal Highness, this is really... magical," the young alchemist exclaimed. "You have proved the correctness of Elementary Chemistry. I am afraid that all the alchemists will not expect that even the air everywhere can be so complicated. ”

“With pure oxygen, is it possible to observe a more violent oxidation reaction? I have a lot of experiments to do,” said Kemer excitedly.

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

Nitrogen is the most important raw material for synthetic ammonia. It can be reacted 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. Externally, energy is required. For example, the discharge is heated by the arc to heat the gas to thousands of degrees. This is also often thunder. The place where the soil is more fertile. Because of this, this type of equipment has high requirements and high energy consumption, so it is not suitable for formal production.

If the production capacity is urgently needed, the production method is the most efficient, and even the catalyst is not required, and only continuous discharge is used... or other means can be used 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 mixed into the closed reactor in proportion, the nitrogen monoxide can be continuously generated.

He decided to try it this way.

(To be continued.)

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