At the end of the street outside Wanfu, there is a teahouse.

Yang Sichang was on the second floor, leisurely sipping tea.

This is the best Pu-erh tea.

Genuine, the servant went upstairs, leaned behind him, and whispered: "Master, Li Guoying has been in for almost an hour and hasn't come out yet." ”

"Then don't stare at it, just wait here." Yang Sichang said.

"Master, how is Li Guoying different from the generals I have seen before." The servant said.

Yang Sichang was slightly surprised: "Tell me, why is it different?" ”

He had a hint of interest in chatting, and he was idle anyway.

"The Liaodong Army has been outside the Guan, and it stands to reason that it should be flying high."

The servant said, "General Li is very respectful to you, and he is also very good to the soldiers below. ”

Yang Sichang smiled: "Such a general is even more terrifying." ”

As the saying goes, a dog that bites doesn't bark. The gentler he is to you, the more dangerous it is.

You know, the saber in his hand is as sharp as clay.

Another servant said, "Why hasn't Li Guoying come out yet?" Don't delay your trip. ”

"Don't worry, you can't miss it." Yang Sichang smiled meaningfully.

The servant continued: "Master, why didn't you take Li Guoying in? ”

"What am I doing in there?"

Yang Sichang said: "If I go in, it will be a big deal." Besides, the capital is a place of right and wrong, and the less you know, the safer. ”

As smart as Yang Sichang, he had already noticed Li Guoying's purpose of going to Wanfu, so he didn't follow.

He had already heard that the imperial court was also asking the emperor's relatives and the Manchu civil and military ministers to donate silver in the name of suppressing thieves.

Appearing in Wanfu at this time is equivalent to handing the handle of the knife to the opponent and stabbing him.

At this moment, the servant who was guarding downstairs went upstairs.

He ran very fast, shouting as he ran: "Come on, come on!" ”

Yang Sichang immediately got up, threw the teacup on the table, and asked, "Who came with Li Guoying?" ”

"There are Zhou Mansion's personal butlers, Tian Mansion, Gongshun Hou Mansion, and Wan Mansion."

The servant said urgently.

"Quick, let's get out of here at once."

Yang Sichang hurriedly said: "You go and tell Li Guoying, just say ...... Just say...... I have something to do, so I'm going to visit other adults, and I'll look for him in the camp later. ”

"Yes." The domestic servant, who had already run out of breath, ran downstairs again.

Yang Sichang hurriedly settled the account and hurriedly went downstairs.

As he went downstairs, he muttered, "Why can't the emperor do this, but he can do it easily." ”

Just when Li Guoying asked the four for money, Yang Chengying's development of the sulfuric acid plant was also completed.

Speaking of this, we have to mention the group of respectable people in history who made their own explosives without modern chemical industrial equipment.

It is well known that one of the important raw materials for the development of explosives is sulfuric acid.

Sulfuric acid is known as the "mother of gunpowder".

The manufacturing methods of sulfuric acid include the contact method and the lead chamber method.

The contact method required platinum, vanadium pentoxide, etc. as catalysts, which was completely impossible under the conditions at that time.

That group of respectable people chose the lead chamber method and creatively invented the cylinder tower method to produce sulfuric acid.

The specific method is to replace the lead chamber with a water tank, and every four water tanks are buckled to form a tall tower with a large volume, and the middle is opened.

Use a relatively corrosion-resistant lead pipe in series, and use acid-resistant porcelain tiles as a filler before and after.

Install two more devices.

One is a triangular copper sulphur box, in which sulfur is placed, the sulfur is ignited, and the bellows are used instead of fans to blow air to produce sulfur dioxide gas.

The other is a fire nitrate tank, which is filled with fire nitrate and sulfuric acid, and produces nitrogen oxide gas after heating.

All the sulfur oxide, nitrogen oxide gas and oxygen produced enter the cylinder tower together and evaporate through multi-stage circulation to form sulfuric acid.

The flue is also used to draw the hot smoke from the hot iron can, and the temperature of the front tower is raised from outside the tower, so as to improve the efficiency of the front tower to form acid again.

Then the gas can't be released, so Yang Chengying learned the soil method taught in the book, and made his own particles to wipe the gaps to ensure that there is no gap between the four cylinders.

The disadvantage is also obvious, that is, you will see the distillation column foggy and pungent smell from a long distance.

Yang Chengying's clothes were often forced to change.

It's too rotten to wear.

After fifteen days of tossing, I finally got pure sulfuric acid.

Song Yingxing and Tang Ruowang, who were studying on the side, were stunned when they saw the sample.

"Oh my God, how did you do that!" John Tang was so shocked that he couldn't speak Chinese well, and he used German.

Song Yingxing is still very unfamiliar with explosives, but he is calmer than John Tang: "Now that there is qualified sulfuric acid, the next step is to study the 'nitric acid' you said." ”

"Don't worry, the first step is to set up a factory specializing in the production of sulfuric acid and completely standardize it."

Yang Chengying smiled and waved his hand, then looked at Tang Ruowang.

Tang Ruowang also understood what Yang Chengying meant by looking at him, so he said: "Although I can lead, I am afraid that the workers will not listen to me." ”

"You just have to rest assured, I'm always there, and no one dares to do anything to you." Yang Chengying said.

"Then I'll be reluctant to do it." John Tang said with a smile.

"That's good. You come with me and pick the right workers. I'm going to teach you step by step how to make sulfuric acid. ”

"Okay." John Tang said excitedly.

"This doesn't seem to be very fast, if there are too many people to choose, they all put aside, obviously very inappropriate."

Song Yingxing suggested: "Why don't we make the most of the evenings and study while working?" ”

"That's a good idea." Yang Chengying nodded in agreement.

"Since that's the case, why don't you call the others who are not under my name and go to class together."

John Tong also proposed.

Yang Chengying shook his head and said, "The space is limited, and it can't be used." And we have to use our limited strength in practice, and there is no reason to become fat in one bite. ”

John Tang nodded at this time.

Yang Chengying and he selected 2,000 workers and arranged the posts in advance.

They learned to make sulfuric acid during the day, and listened to Yang Chengying's lecture on safety production at night.

This is called theory first.

This small factory, located in the southeast of Chaoyang County and next to the Daling River, was named Dagou Chemical Plant by Yang Chengying.

Dagou is a place name.

This factory is not only producing sulfuric acid, but also learning to produce nitric acid.

Just when the workers were ignorant, they followed Tang Ruowang and Yang Chengying, the technician who made the equipment, to learn sulfuric acid.

Yang Chengying began to take some people to make nitric acid.

All high explosives are a mixture of sulfuric acid and nitric acid, which is a reaction caused by the addition of other chemicals.

So, nitric acid is equally important.

Yang Chengying switched to a large vat made of ceramics, pasted a layer of refractory clay on the outside of the cylinder, closed the mouth of the cylinder with a ceramic basin and heated it over low heat.

Relying on this set of equipment, the production is concentrated nitric acid.

However, the real test has only just begun.

How to degrease cotton with soil methods, and how to make it into cotton wool after degreasing.

It's all a huge hurdle.

The significance of creating a smokeless propellant is enormous.

He would bring about the first major revolution in firearms.