There is ready-made alum oil, which can generate sulfur trioxide under the action of strong heat, and sulfur trioxide reacts with water to produce relatively pure sulfuric acid.

This whole process can be carried out by heating, but what he can get at this step should only be pure dilute sulfuric acid, which is far from being able to synthesize chlorosulfonic acid.

However, it is not so difficult to purify concentrated sulfuric acid, and the simple and crude way is to cook directly, but this step can increase the concentration of sulfuric acid to about 70% at most.

But that's enough, 70% happens to be the dividing line between concentrated and dilute sulfuric acid, and this concentration can barely be used.

The equipment in his hand can barely meet the whole process, but the amount of sulfuric acid as the basic chemical reagent will be very large.

So he still drew some equipment, mainly some bottles and storage tanks, after all, thick acid is not something that can be used for anything.

The next step is to use concentrated sulfuric acid to prepare concentrated hydrochloric acid, in fact, this reaction is very simple, only need to add sodium chloride to concentrated sulfuric acid, that is, table salt, and the hydrogen chloride gas generated in the reaction is combined with water is hydrochloric acid.

He drew a device with two flasks attached, the one on the left and the one on the right connected by a tube, and the one on the right with a dripping water drain device attached to it.

In this way, concentrated sulfuric acid and salt are placed in the left bottle, and the hydrogen chloride gas produced will be transferred to the right flask along the tube, and the water dripping in the flask will be thoroughly mixed, so as to increase the concentration of hydrochloric acid.

With these two things, chlorosulfonic acid is only the final process of heating and fuming, which is not difficult, but there is an obvious problem, that is, chlorosulfonic acid is toxic.

Chlorosulfonic acid vapor can directly damage the respiratory tract, ranging from cough, sore throat, runny nose and tears to chemical pneumonitis or pulmonary edema.

That's really Yan Yunzhou is hopeless, and he has to take his own life.

Yan Yunzhou saw from a distance that Ning Qi began to support his cheeks again, he smiled, got up with his clothes on, and coughed a little when he got up, Ning Qi heard the sound and looked over:

"What's wrong?"

"No, I want to see what you're drawing so seriously?"

Yan Yunzhou walked slowly to him, Ning Qi subconsciously patted the chair next to him, Yan Yunzhou sat down and gathered the clothes he was wearing on his body, looked down, Ning Qi was funny:

"Do you understand?"

The people around him shook their heads quite honestly and asked:

"I don't understand, why did you stop? What's the problem? ”

Ning Ji raised his pen and circled the three words of chlorosulfonic acid:

"This thing is an intermediate product of pharmaceuticals, it is poisonous, you can't touch it with your hands, you can't smell it with your nose."

Yan Yunzhou's eyes were fixed on the three words of chlorosulfonic acid, frowning slightly, it was already a very poisonous poison that he couldn't touch or smell, and he couldn't hide his worry when he looked at Ning Yao's eyes:

"Intermediates? Does it have to go through this poisonous thing to make your medicine? ”

Ning Qi put down the pen, hugged his arms with both hands, and nodded helplessly:

"Yes, you can't get around, it's a very important ingredient, and you have to go through it."

"What happens if you touch it and smell it?"

Ning Ji turned his head, raised his chin slightly, and smiled:

"It's about the same as you."

Yan Yunzhou's eyes tightened, and he suddenly raised his hand to put away the painting paper in front of Ning Qi, but Ning Qi was startled by his movements, and hurriedly buckled his wrist:

"Hey, what's the matter?"

Yan Yunzhou's pale face was a little serious:

"Don't do it."

Ning Ji was stunned for a moment, his hand held his wrist again, and he raised his eyes to meet Yan Yunzhou's eyes that didn't even make the slightest joke, is this afraid of poison? He couldn't help but laugh:

"Wait, wait, it's not that serious, you can't touch my gloves, you can't smell it, there's a way, just make a mask, don't move, it's all crumpled, I finally drew it."

The wrist under Ning Qi's hand was cold, Yan Yunzhou looked at him, as if judging the credibility of his words, Ning Qi hurriedly took advantage of this gap to rescue the paper under his hand, saw the hesitation in his eyes, and immediately spoke again:

"Really, I didn't lie to you, do you think I look like a person who is not afraid of death?"

The property of chlorosulfonic acid is indeed a bit troublesome, but it is not impossible, a simple gas mask will do, and it will not take too long anyway.

Yan Yunzhou let go of his hand when he heard what he said, and stared at him very solemnly:

"Yu'an, if you need to take a risk, don't do it."

Ning Ji knew that what he said was true, and couldn't help but move slightly in his heart, what he did was the medicine for him, if he gave up, he would really be hopeless, he didn't want to think deeply about the meaning of Yan Yunzhou's words, and just smiled lightly for a while:

"Rest assured, there is no problem, making a gas mask is simple."

Yan Yunzhou didn't say anything more, but he didn't walk away, just sat on the side and looked at him quietly, Ning Yi continued Fang Cai's train of thought.

Chlorosulfonic acid is ready to come out, and the rest is the main event, the preparation of benzene.

If he is sure of chlorosulfonic acid in the presence of concentrated sulfuric acid and concentrated hydrochloric acid, then he really does not have much spectrum in mind about the preparation of benzene, after all, it is difficult to make benzene even in modern laboratories.

Now he can think of a way to make benzene is to obtain coal tar by dry distillation of coal, then by hydrochloric acid washing of coal tar, and finally by repeated distillation to obtain benzene.

And there is a high probability that he can only get relatively crude benzene, but he really has no better way now.

The most practical practical use of dry distillation may be dry distillation coal, the reaction process is actually very simple, that is, in the case of isolating the air, the coal is heated.

To make it carbonize and decompose, the general product is generally decomposed into different gases, solids and liquids according to different temperatures.

What he needs is to heat the coal to about 500 degrees, at this time the coal tar will precipitate, and the crude benzene will exist in the coal tar, and then the benzene will be refined by processing the coal tar, so he needs to draw a dry distillation device.

Ning Yi found a relatively large piece of paper, and while drawing, he kept thanking the chemistry teacher from the third year of junior high school one by one in his heart.

Especially Uncle Yang, who taught organic chemistry when he was an undergraduate, how many students complained that he was looking for trouble because he asked them to draw experimental devices every time?

But now it turns out that your teacher will always be your teacher, and your uncle will always be your uncle.

Dry distillation coal is a classic experimental reaction when studying organic chemistry, and the dry distillation device Ning Zhi didn't know how many times he painted it when he handed in his homework in college.

It's just that there is a problem that he is very familiar with this installation diagram, that is, this brush is a little bit less obedient to him.

In Yan Yunzhou's eyes, Ning Yi was holding a pen trembling and painting very seriously, and he didn't dare to breathe in his atmosphere, lest he make a trembling mistake in drawing.

Finally, after half an hour, Ning Qi stopped his pen and finally drew this diagram of the retort column, not only that, but he also drew the details that need to be paid attention to by enlarging the drawing, so that the craftsman can be more intuitive when manufacturing.

Ning Ji finally put down the pen, raised his hand and pressed his shoulder, this is really troublesome with a brush, and the whole arm is forced, Yan Yunzhou looked at the picture:

"Finished?"

"Well, after the painting is finished, these two pictures will be sent to Youzhou tomorrow to find someone to make, if you can, you can make a few more sets."

Yan Yunzhou nodded:

"Don't worry, I'll send people out tomorrow morning, it's not early, go to bed early, and I'll take you to learn to ride a horse tomorrow."

After saying that, he got up with the table, Ning Ji rubbed his shoulders and went to freshen up and lie down, when he lay down, he couldn't help but have a little expectation for learning to ride a horse tomorrow, he remembered something and suddenly looked at the bed and asked:

"Shall we use your lightning tomorrow?"

Yan Yunzhou heard the excitement between his words and smiled:

"Well, Lightning is very good."

Ning Zhi lay on his side and listened to Yan Yunzhou praise his horse for being good, and he was a little funny in his heart, how could this picture feel so disobedient:

"Isn't the lightning breed very good? Is there a kind of horse called a sweaty horse? ”

He knew that during the Han Dynasty, Zhang Qian sent an envoy to the Western Regions, and saw a good horse called the sweat and blood horse in Dawan, and he didn't know if there was such a horse in this era.

There was a chuckle from the couch:

"You know a lot, sweat horses are produced in the northwest of the Western Regions, and they are indeed thousands of miles of good horses, but although the feet of sweat horses are fast, but because of their slender size, they are less important, so most of the sweat horses that come from tribute are raised in the mansions of dignitaries, but they are rarely used in the army, and lightning does have the blood of sweat horses, but it is not pure."

Ning Yi tilted his head sideways and listened to him, I didn't expect this reason, yes, in the army, horses not only have to run fast, but also be able to pull supplies and carry weight:

"So Lightning's feet are fast, too?"

"Well, you can travel 800 miles in a day."

Ning Qi was a little surprised, 800 miles a day, that's 400 kilometers, if you don't take the high-speed in modern times, it will take half a day to run 400 kilometers on the national highway.

The next morning, Ning Qi got up very early, Yan Yunzhou changed into a strong suit, put on a thick cloak, and took Ning Qi to the stable in the backyard after breakfast.

Lightning saw that Yan Yunzhou seemed to be very intimate, his nose kept rubbing against his palm, Yan Yunzhou patted him, but he was a little emotional, he was seriously injured for most of the year, but he didn't come to ride it for a long time, Ning Ji looked at this person and horse a little funny:

"Is it playing tricks on you?"

This horse is really quite human.

"It's been a long time since I've come to see it, let's go, let's go to the back."

Before coming out, Ning Ji tied thick knee pads to Yan Yunzhou's legs, although the wind could not blow through, but it always had some influence on his actions, Ning Ji watched him walk on the snow one foot deep and one foot shallow, so he spoke directly:

"Aren't you going to go outside to learn on horseback?"

Yan Yunzhou looked at him:

"Let's come together."

He stretched out his hand and pulled Ning Yao's body:

"Foot here, hand on the reins, and go up, don't be afraid, lightning is very good."

Ning Qi saw that this should be Yan Yunzhou's order before, put two saddles, and when he got on the horse, he felt that his problem was not too big, but he was a little afraid of the horse moving, seeing Yan Yunzhou holding the lightning, he was relieved, his hand grasped the reins steadily, one foot was on the stirrup, and he jumped up to the horse.

After sitting on the horse's back, he felt that the horse was really high, and his vision was different, this feeling was still quite novel, he couldn't help but smile on his face, and looked down at Yan Yunzhou:

"Come up too."

Yan Yunzhou put the reins on one hand, jumped on the horse easily, he seemed to be a little happy when he came up, and immediately trotted up, Ning blamed an unsteady body and leaned back:

"Ahh

The body was leaning into Yan Yunzhou's arms, he even heard the chuckle of the person behind him, and realized that he was ashamed, Yan Yunzhou grabbed the reins with one hand and buckled Ning Qi's waist with the other:

"Don't be afraid, don't be nervous, relax on your legs, the more you clamp the horse's belly, the more it runs, relax."

It seemed that there was someone behind him who felt a little safe, and Ning Qi slowly relaxed, not as nervous as Fang Cai on the horse.

Lightning's pace is not fast, it's like taking a walk, but in Ning's senses, it's already very fast, it's the same as learning to drive, the old driver 120 is no problem, and the rookie feels that 20 miles are off track.

"Use the reins to control the direction this way, take your time."

Yan Yunzhou let Ning Ji hold the reins and slowly taught him how to control the direction, Lightning's steps were not fast, but he walked slowly towards the snowfield in the distance.

Ning Qi had an experience class in modern times, that is, in a place the size of a basketball court, and at that time the equestrian coach taught a little bit of posture precautions.

He didn't remember it too much, after all, the one who went there was to experience it, plus there were people who liked to open and take pictures, and horseback riding was secondary, but now it was different, his teacher was Yan Yunzhou, there must be no standard sitting posture here, just look at the leisurely posture of the person behind him.

Slowly, Ning Yi could pull the reins and let the horse go forward: