On the day when Zhu Pingjin listened to the rain in Bifeng Gorge and started class, his wife Luo Yuhong was sitting at the desk in the rent collection courtyard and meditating. She plans the next step in production research.

It was late at night, and the dim oil lamp jumped and jumped, which made Luo Yuhong even more irritable, making it difficult for her to concentrate. With the strong support of the princess, the essential oil products were immediately sought after by the market as soon as they were launched. The main consumer groups are the various royal palaces. Princess Fushun started the fastest and most ruthlessly, buying five bottles at a time. Princess Taiping hesitated for a moment and only bought three bottles. As for the other palaces, only one bottle was bought. The essential oil even alarmed the prince. The reason is that a general of the town under King Deyang, because he couldn't stand the noise of the mother-in-law at home, had to turn around and inquire about the origin of the essential oil, and directly asked to see the prince, hoping that he would say hello. The prince asked the great eunuch Chen En to send a message to the princess, saying that everyone is a relative, don't hurt the harmony, and if there are good goods, they will be evenly matched with each other. The prince's words were transferred to Luo Yuhong by the princess, which made her embarrassed. The stock of dried flowers in the palace has been used up, and everything else that can be collected has also been used up. Luo Yuhong doesn't dare to offend her future in-laws now. In desperation, she asked Li Sixian to steal more than a dozen bundles of dried straw in the field, distilled the essential oil and mixed it with the Baihua essential oil for her own use, and then she barely made a difference.

It's a pity that the same mother doesn't have the same fate. Essential oils were a success, but the follow-up essential oil soap project failed miserably.

The reason for the fiasco is not that the quality and efficacy of the product are stubble, but that the appearance is too poor. The essential oil soap did not look crystal clear at all, but a gray and black wood, which made people want to vomit when they looked at it. The reason is that Luo Yuhong replaced caustic soda with plant ash soaked in water, which caused the soap to be dirty, and there was no ultra-fine filter material. To this end, Luo Yuhong experimented with precipitation, adsorption and other methods, using good silk and rice paper, but the effect is still not ideal. At present, it is impossible to get pure caustic soda, so Luo Yuhong had to reluctantly announce that the project was temporarily suspended. In addition to the loss of manpower and material resources, two bottles of excellent essential oils were also put on board.

What product to develop next, Luo Yuhong began to be a little undecided. A business has just entered the market, and civilian goods are the most profitable. However, civilian products are the least needed at present, and the most needed are military products. Her main purpose in producing essential oils is nothing more than to win the approval of her future in-laws, and it doesn't matter whether she makes money or not.

Since the first lunar month, Zhu Pingjin took her younger brother Luo Jingyun to Mengding Mountain, and I don't know how they are training their soldiers now. Maybe in another year or two, he will personally lead his troops to the battlefield. The two have lived together for so many years, and Luo Yuhong knows Zhu Pingjin well. This is a war about the survival of the Ming Dynasty, and it is also a war about his survival and his own survival. As long as Zhu Pingjin's surname is Zhu, then he has no room for compromise and evasion. As a time-traveler from the future world, he would never be foolish enough to let a soldier practice broadsword and spear. In the war of life and death, accompany Li Zicheng, Zhang Xianzhong and the fourth elder brother to play weapon upgrade games. From the very beginning, he had to use the knowledge that the two of them possessed that was ahead of this era, and use all the resources he had at his disposal, to create a weapon that was absolutely superior to his opponent, and then turn the other party into a corpse with no threat! She was very sure that if she could build an atomic bomb, Zhu Pingjian would not hesitate to use it on the battlefield!

If you want to fight, you have to die, this is something that can't be done, which made Luo Yuhong sigh and return to reality. The creation of murder weapons was a must, and she had no choice at all. When Zhang Xianzhong went north from Renshou County to attack Chengdu Mansion, he passed by the rent collection house where Luo Yuhong now lives. It was then that the grain hoarded in the granary disappeared. To fight a battle like Zhu Pingjian, a large amount of gunpowder and explosives were needed, and there were also all kinds of pyrotechnics, such as firing charges, hair pulling charges, detonators, and so on. Luo Yuhong knew these things, but she was not familiar with them. But Luo Yuhong believes that for an undergraduate student majoring in chemical engineering, unfamiliarity is only relative. It is impossible for people majoring in chemical engineering not to learn nitro compounds, and commonly used explosives basically belong to nitro compounds, such as mercury, fire cotton, ammonium nitrate, T NT and other pyrotechnics, only a few things such as potassium chlorate are not.

Nitro compounds are absolutely unavoidable of nitric acid. Twenty years ago, she graduated from university and interned for half a month in a nitrogen fertilizer factory in China. The main product of the plant is agricultural urea, and the by-products are nitric acid, ammonium nitrate, sulphuric acid and melamine (Note 1). The urea production process is divided into three parts, the first is ammonia, the middle is urea, and finally the packaging. The whole production process, in short, is the synthesis of ammonia from natural gas, and the ammonia enters the urinary tower to become urea. The by-products nitric acid and melamine are diverted on the ammonia pipeline, and the ammonia produced by the ammonia synthesis plant is sent to the nitric acid and melamine production unit for the next chemical reaction. The nitric acid production process adopts the ammonia oxidation method, which is to mix ammonia with air, catalyze it through the hot platinum rhodium alloy mesh in the ammonia oxidation furnace to generate nitric oxide and nitrogen dioxide, and finally enter the water to absorb it into dilute nitric acid. Dilute nitric acid then absorbs water with concentrated sulfuric acid to become concentrated nitric acid.

Ammonia oxidation method, Luo Yuhong shook his head. There is no ammonia, and there is no platinum rhodium alloy mesh. Platinum rhodium is an extremely expensive platinum-based precious metal, and the ammonia oxidation furnace in the dilute nitrate unit must be stopped regularly to sweep the ash, and then the dust in these furnaces is sent to a factory in Taiyuan to re-refine platinum and rhodium.

What about the saltpeter sulfate reaction method? Saltpeter is ready-made, and Luo Yuhong's pharmacy has it. She remembers that it was a grayish-white lumpy opaque crystal, which was used in traditional Chinese medicine to treat headaches, heart and abdominal pain, and other diseases. The Han Dynasty's medical book "Shennong's Materia Medica" is also recorded, and it is highly evaluated, and it can treat more than 20 kinds of diseases.

The saltpeter sulfate reaction method seems to be feasible, and with sulfuric acid there is nitric acid! The production plants of sulfuric acid and nitric acid in chemical plants are generally neighbors and are built together, mainly to use the high water absorption of concentrated sulfuric acid to produce fuming nitric acid (98% concentration). The reaction of sulfuric acid with saltpeter to produce nitric acid is too costly, but it can solve the problem of nitric acid.

Saltpeter dry distillation can also give some nitric acid, and it should be feasible to deduce it with molecular formulas. But how to dry distill saltpeter Luo Yuhong is not clear, and she does not know whether it will explode during the dry distillation process.

Thinking of this, Luo Yuhong finally shook her head. At present, the conditions for large-scale nitric acid are not mature, and there is only a small-scale trial production. She does not have a laboratory, and conducts preliminary and secondary tests; There is no chemical machinery to prevent corrosion of production equipment; There is not even a single piece of information to consult, not even a thermometer to control chemical reactions!

"Little Red! Little Red! Luo Yuhong shouted a few times but did not respond, so she had to find the teapot and pour a cup of cold water.

"Dead woman, I don't know where to go!" Luo Yuhong scolded in a low voice, not noticing that the time had passed.

"We should immediately establish a number of comprehensive enterprises integrating scientific research and production, and bring together metallurgy, iron and steel, chemical industry, machinery, and other fields related to war science and technology!" The distraught Luo Yuhong finally sorted out a train of thought. But she took out the paper to record, only to find that the tip of the brush and the ink had already frozen together.

"Little Red! Li Sixian! Luo Yuhong pushed open the door and shouted again.

"What is the matter with Miss Luo calling slaves?" Li Sixian ran out of the wing room in the front yard with his clothes on. Since the discontinuation of the essential oil soap project, the rent collection yard has been suspended. Luo Yuhong put the eunuchs back into the palace, but Li Sixian refused to leave, saying that the prince specially asked him to come over to listen to Miss Luo's orders. Luo Yuhong was very unaccustomed to a man serving him closely, and knew that he was actually not a man, and there was no threat, so he had to stay as he wished, and he didn't want him to wait with him. Li Sixian had no choice but to continue to stay in the gatehouse in the front yard and do nothing.

Luo Yuhong said: "Go to the stove to find a carbon bar, this girl wants to write!" ”

Li Sixian had already run closer, "The girl wants to write, and the slave will immediately study the ink." ”

Luo Yuhong said impatiently: "When will it be?" If you are told to go, go quickly! ”

Li Sixian hurriedly responded, turned around and ran to the stove in the front yard. After a while, he ran back with his hands in the dark, clutching a carbonized wooden stick in his hand.

Luo Yuhong was blown by the north wind outside the house, and the fire had already gone down. When she saw Li Sixian's appearance, she was inevitably a little embarrassed, and hurriedly asked him to go back and continue sleeping.

Li Sixian said: "Since the girl didn't sleep, how could any slave go to sleep first?" Slaves and maids are waiting outside this door! The carbon strip was thicker, and the slave and maid sharpened it and the girl used it again. It is better to wrap it in another layer of paper so that the girl's hands do not get dirty. ”

Luo Yuhong's mood at this time can only be described as moving. She had never found such a dedicated employee before. They are always late for work hours and leave early before the end of the day. Now there is one who has come out of nowhere, and he is still an artificial disabled person who is neither male nor female, which really makes her admire it very much.

"You don't stand outside. It's windy outside, don't catch a cold. Come in and sit down! I've got to work for a while. Luo Yuhong commanded, went straight back to the desk, and began to write his thoughts one by one with a finely ground carbon strip.

A simple and natural thoughtfulness, but it makes people grateful. She didn't notice at all that Li Sixian's dark hands were trembling in the night.

“…… purification of potassium nitrate; natural gas desulfurization to sulfur; Charcoal is extracted by dry distillation method. Sulfuric acid is then produced from sulfur ......"

Luo Yuhong finished writing the last few words, put the carbon strip aside, and let out a sigh. She confirmed the focus of her recent research: the first is the trial production of nitric acid sulfate; The second is the industrial production of black powder. At the same time as these two tasks, the preliminary preparation for the establishment of comprehensive scientific research and production enterprises began. However, the funds, land and talents required for this preparation will have to wait for Zhu Pingjin to come back, and the two will discuss it before proceeding.

Tomorrow, go home and bring some saltpeter and brimstone. Those things are in danger of exploding, so they have to be left here.

What is Zhu Pingjin doing? Will he miss me? Luo Yuhong looked out the window at the dark courtyard. There was not a single light outside, revealing a primal darkness; There was also not a sound outside, as if the world had stopped. The brazier in the room had been extinguished, Li Sixian was lying on the table and had fallen asleep, Luo Yuhong took a deep breath of real air, and said to himself in his heart:

It turned out that you sold fake drugs to kill people for money, but now you make explosives to kill people. What the hell are you doing all your life!

Note 1: It is the kind of melamine added to Sanlu milk powder.