Some chests for new materials are missing. After searching for the lost box for a while, I found a similar box near the garbage station.
Yang Yuling said: "It's this box. There are some things left in it."
Gao Zhouzhi said: "Would you like to open it and take a look?"
Yang Yuling said: "Don't open it yet. It's a bit dangerous in case it's radioactive. You can take it back and analyze it first."
After half a day, the test and analysis results came out.
Yang Yuling said: "After analysis, it is liquid ammonia. It is a colorless liquid with a strong pungent smell. Please be careful, as it is easy to cause poisoning and casualties. Ammonia is toxic, a pungent and foul-smelling gas, and is easy to volatilize. , ammonia leaks into the atmosphere and spreads to a certain range, easily causing acute poisoning and burns. There are also several tanks containing liquid hydrogen and liquid oxygen."
Gao Zhouzhi said: "What are they doing transporting this thing?"
The functions of liquid ammonia are: Liquid ammonia has a low boiling point and heat of evaporation, can be used as a coolant, and is widely used in refrigeration and air-conditioning systems. Liquid ammonia has strong dissolving power and can be used as a solvent to dissolve and dilute various chemical substances. The nitrogen in liquid ammonia can be used as a nitrogen source for plants and used in the production and application of agricultural fertilizers. Liquid ammonia has strong reducing properties and can be used as a reducing agent in some chemical reactions.
The role of liquid hydrogen: Liquid hydrogen is an efficient fuel that can be used in rocket propellant, fuel cells and other fields. Liquid hydrogen has extremely low temperatures and can be used as a coolant for superconductors and other high-temperature applications. The hydrogen element in liquid hydrogen can be used for the production and supply of hydrogen, and for the development and utilization of hydrogen energy. The role of liquid oxygen: Liquid oxygen is a high-concentration oxygen supply source that can be used in medical, industrial, aerospace and other fields. Liquid oxygen has strong oxidizing properties and can be used as an oxidant in some chemical reactions and rocket propellant. Liquid oxygen has a lower temperature and can be used as a coolant to cool high-temperature equipment and materials.
Yin Fanxiao said: "Speaking of ammonia, this should be the production of urea. In the chemical reaction to produce urea, ammonia and carbon dioxide react to form urea and water molecules. During the reaction, electrons are transferred from ammonia to carbon dioxide, making The ammonia gas becomes the nitrogen atoms of ammonium nitrate. The electrons of the carbon dioxide in turn become the carbon atoms of the urea and are mixed with the water atoms of the water molecules and form water molecules."
Yang Yuling said: "Isn't it enough to directly react ammonia and carbon dioxide? Why do we need to make liquid ammonia?"
Yin Fanxiao said: "Isn't that for convenience of storage and transportation?"
Luo Shao said: "Is it used to make refrigerant?"
Gao Zhouzhi said: "Yes, it's like Freon. It circulates in the air conditioning system."
Ye Jiazhen said: "But there is also liquid hydrogen and liquid oxygen. So if these things are together, they should be used as fuel."
Gao Zhouzhi said: "I am also thinking of fuels. Then I guess he will also make other fuels. Are there fuels or other types of fuels in some of the other products he is researching? There are many compounds that can be used as fuels. Petroleum and petroleum products, such as gasoline, diesel, and kerosene. Natural gas, primarily methane. Biomass-burning ethanol and methanol. Liquefied petroleum gas, primarily propane and butane. Hydrogen, which can be produced by water electrolysis or natural gas reforming. Coal, which can Converted to gas by combustion or gasification. Nuclear fuels, such as uranium and plutonium."
Yang Yuling said: "Where should it be used? Is it used on cars or in factories?"
Ye Jiazhen said: "We do not use this kind of fuel in our cars currently. The main fuels in cars are: Petroleum gasoline: The main component is hydrocarbons, including alkanes, olefins and aromatic hydrocarbons. Common petroleum gasolines are Unleaded gasoline and diesel. Diesel: The main component is also hydrocarbons, but compared to gasoline, diesel has a longer carbon chain and contains more alkanes and aromatic hydrocarbons. Natural gas: The main component is methane, and also includes a small amount of ethane alkane, propane, butane, etc. Natural gas is a clean energy source.”
Luo Shao said: "That is in the factory, used for heating, thermal processing and the like."
Ye Jiazhen said: "Have you ever thought that this might be used in rockets? In rocket fuel, common liquid fuel compounds include the combination of liquid oxygen and liquid hydrogen, the combination of liquid oxygen and kerosene, the combination of liquid oxygen and liquid Combinations of methane, etc. Common gas fuel compounds include the combination of liquid oxygen and liquid hydrogen, the combination of liquid oxygen and liquid methane, the combination of liquid oxygen and liquid ammonia, etc.”
Yang Yuling said: "I know that there is a liquid ammonia manufacturing factory in Shicheng City."
Ye Jiazhen said: "Then let's go and take a look."
When they arrived at the liquid ammonia manufacturing factory, they explained their purpose of coming, which was to find the person who stole the element jar. They also saw some liquid ammonia production units, transport units and storage units. The manager also introduced them to the steps for making liquid ammonia.
Ammonia is produced through ammonia synthesis reaction: Nitrogen and hydrogen are usually used for ammonia synthesis reaction under the action of a catalyst. This reaction is usually carried out under high temperature and high pressure conditions.
Compression and cooling: The synthesized ammonia gas is compressed and cooled to reach liquefaction conditions.
Separation and purification: Separate liquefied ammonia gas from unliquefied gas and perform purification treatment to remove impurities.
Storage: Store pure liquid ammonia in special containers to ensure its safety and stability.
Gao Zhouzhi took out the jar and said, "Is this jar also produced here?"
"We just produce liquid ammonia. The tanks are made by a machine shop next to us."
The storage of liquid ammonia usually requires attention, storage container: Liquid ammonia is usually stored in special pressure vessels, such as ammonia gas tanks or liquid ammonia tanks. These containers must have sufficient strength and sealing properties to ensure safe storage of liquid ammonia. Temperature control: The storage temperature of liquid ammonia is usually between -33 and -42 degrees Celsius, so measures need to be taken to maintain a low temperature in the storage environment. Ventilation and explosion-proof measures: Liquid ammonia has certain toxicity and flammability, so the storage area should have good ventilation conditions and take explosion-proof measures to prevent accidents. Safety signs and warning signs are posted on it.
They went to the nearby machinery processing factory and asked about the sales of this can.
"There are quite a few orders for jars from us, and some are sold to other cities. These are the orders in the past few months. Do you want to see them?"
Yang Yuling said: "There are hundreds of orders here. Do we need to check them one by one?"
Gao Zhouzhi said: "Do you recognize this jar? Is it made here?"
"Yes, there's still a number here."
Gao Zhouzhi said: "Then when did you think this was made?"
"This should be from two years ago."
Luo Shao said: "But it has only recently started to be transported, so this should be an old can."
"It should be old. It may have been used by others and left unused."
