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Chapter 226 Liaodong Town

After solving the problem of Jin Yiwei, Hong Tao retreated back to Qiongdao Guanghan Hall to continue his great cause of chemistry.A month later, things have changed a lot. Under the leadership of three craftsmen, twenty young eunuchs have become proficient in fractionating coal tar and properly preserving the products. They are currently making concentrated sulfuric acid using the contact method.

"You, and you, come out! Tell me immediately where these spots on my clothes came from?" Hong Tao didn't praise a word for his achievements, but instead scolded him with his eyes wide open.

"Long live my lord, it was the slave who was clumsy and forgot the order of draining the water, and was burned by sulfuric acid..." The two young eunuchs immediately knelt down and admitted their mistake.

"Come here, pull him down and beat him 30 times, and you will be punished with a month's allowance!" Wang Chengen came out and announced the punishment before the emperor could say anything.

"If acid splashes on your face, it will turn into pockmarks, and if it splashes into your eyes, you will become blind. Anyone who turns a deaf ear to what I said will lose his life sooner or later."

Hong Tao not only did not stop Wang Chengen from gesticulating, but also stood up to support him. This made the three craftsmen look at Wang Chengen with a little more awe in their eyes.In fact, they had misunderstood. Wang Chengen only had such rights in the Cuju team and the Gecko organization, and he did not rely on the emperor's favor to pretend to be a tiger.

"Okay, if you make a mistake, you will be punished, and if you do well, you will be rewarded. If you study hard these days, you will be rewarded. Clean up the hall first, and then I will teach you a method called turning gold water!"

Hong Tao didn't even pay attention to what the craftsmen were thinking. He was already thinking about the jars of crude distillate oil and several large bottles of concentrated sulfuric acid.The basis of the chemical industry is three acids and two alkali, which cannot be omitted no matter how lazy you are.

However, in the process of making three acids and two bases, we can use the primary products of fractionated coal tar to play some tricks and create something useful to make students more interested in learning.

The first step is to use sulfuric acid to prepare hydrochloric acid. This process is relatively simple. You only need to put concentrated sulfuric acid and table salt into a flask and heat it to about 500 degrees. The generated gas is introduced into distilled water to obtain hydrochloric acid. The remaining residue is sulfuric acid containing impurities. sodium.

The second step is to prepare nitric acid. In fact, the ancients discovered nitric acid a long time ago. The method is very simple. Using high-temperature carbonization of nitrate raw materials, such as saltpeter, will produce nitrogen dioxide gas.

This gas was the main culprit in the formation of acid rain in later generations, but everything has two sides. It is very soluble in water. When the concentration is high, it becomes a nitric acid solution. Acid rain can also be regarded as a nitric acid solution with a relatively low content.

"Slowly mix these two acids together in a ratio of 3 parts to 1 part..." After a whole day of hard work, he had hydrochloric acid and nitric acid, and Hong Tao planned to perform some miracle before ending the course.In addition to the chemical formulas in your mind, whether you can succeed or not depends mostly on luck.

"Well, okay, let's see clearly what happened to the gold on my fan pendant!" Today's luck was good. When a layer of white mist rose from the mixture of hydrochloric acid and nitric acid, Hong Tao silently thanked God in his heart, and then He pulled off the gold pendant from the fan pendant and threw it into the beaker without hesitation.

"No...no more...the gold has been melted!"

Wang Chengen relied on his special status to get closer and see things more clearly.After the soybean-sized gold fell into the beaker, it turned black at first, and then became smaller and smaller. In less than a cup of tea, only black residue the size of sesame seeds remained. "Hey hey hey, okay, let's go back and read through the notes for now. I will teach you how to turn gold back in a few days!" Seeing the confusion on everyone's faces, Hong Tao finally felt relieved that his whole day's work was not in vain. But if you want to continue to have fun tomorrow, you have to do some preliminary preparations.

The cost of producing nitric acid by carbonizing saltpeter is too high and the concentration is not enough, requiring multiple reactions and absorption.If you want to produce nitric acid in large quantities, the simplest way is to use the hydrogen chloride waste gas from the production of soda ash and directly dissolve it with water.

But there is no calcining furnace yet, and neither is the gas storage chamber or the water spray tower. It seems that tomorrow we will take the craftsmen from the Internal Affairs Bureau to find a suitable place on Qiongdao to build a small furnace and water spray tower for trial use. Once it works, A factory will be built and put into operation in the lower reaches of Haihe River immediately.

In June, the sun is scorching like fire, and even in the mountains in the hinterland of Liaodong, it is difficult to escape the rolling heat wave.The birds stopped singing and the small animals stopped looking for food. They all hid in the dense woods and waited for the sunset to come out for a feast.

A high gray wall undulates and circles along the ridge from south to north, like a giant dragon that has been stunned by the sun, descended from the sky and prostrated on the earth to rest, its body winding and twisting without a head or tail.

The Great Wall, yes, such a huge wall should not belong to any city. Only the side walls built brick by stone by ancient farming people to resist the intrusion of nomadic tribes would be so majestic and lonely.

It is a pity that not only people have high and low status, but the Great Wall, a dead object, is also doomed from birth.When future generations talk about the Great Wall, most people will think of the Ming Great Wall that starts from Jiayuguan in the west and ends at Shanhaiguan in the east. Some key passes have become tourist attractions and are admired by future generations all year round.

Although this section of the Great Wall was also the Great Wall of the Ming Dynasty, it had an ill-fated fate.When built, the specifications were much lower than those of its brothers. Except for key passes, many city walls were built with gravel.

It is called the Great Wall of Liaodong Town. It stretches from Shanhaiguan in the east to the Yalu River in the west, with a total length of more than 2000 kilometers. There are 21 gates along the way, hundreds of side towers, and tens of thousands of soldiers guarding the east side of the capital day and night.

Crow Falcon Pass was built by Han Bin, the deputy commander-in-chief of Liaodong in the fourth year of Chenghua. It is located at the three forks of the Tuohelun River Valley. The mountains on both sides are steep and rugged. The three gates in the front, middle and back are one mile apart, also known as the Three Passes. Daoguan.

70 miles to the southwest after entering the customs is Qinghe Fort, an important town in Liaodong. After exiting the customs, 80 miles to the northeast is Weihetula City in Jianzhou. It is one of the main transportation routes for the Liaodong region and the Jurchen tribes in Jianzhou. It is also a must for North Korean envoys to pay tribute. The road, which connects the east and west and runs through the north and south, is indeed a battleground for military strategists.

In the historical Battle of Salsh, the 3 Ming army led by Li Rubai, the commander-in-chief of Liaodong, left the Great Wall from Crow Falcon Pass, preparing to encircle the city of Hetula with three other troops.As a result, the remaining three Ming armies were defeated by Nurhaci, and only Li Rubai safely withdrew to Crow Falcon Pass.

In the past, Crow Falcon Pass was heavily guarded. More than 300 border troops patrolled the pass day and night. If they encountered an enemy, they would light three nearby beacon towers to warn Qinghe Fort within a few hours. Thousands of reinforcements arrived.

But today it was as quiet as sleeping. Except for the flags at the critical moment that were blown weakly by the hot wind, there were no soldiers guarding the gate anywhere, and even the city gate was not closed.

(End of this chapter)