1959: Carrying the achievement system, she rolled

Having made a small step forward, the three of them will continue their efforts and devote themselves to the experiment.

The organic chemical raw material that Du Yimeng wanted was terephthaloyl chloride, the raw material of which was terephthalic acid, and xylene was the raw material of terephthalic acid.

It seems complicated, but it becomes much simpler if you take it step by step.

First, terephthalic acid is produced and then oxidized by air at a high temperature of about 160-230°C and the action of a catalyst.

The reaction produces terephthalic acid and acetic acid, which are then purified through processes such as crystallization, filtration, and drying to obtain pure terephthalic acid.

This method is stable in operation and can produce high-quality terephthalic acid, but it also requires the use of a large amount of acetic acid as a solvent, which has a high production cost and is also highly corrosive to equipment.

Another method is gas phase oxidation. The raw material is still paraxylene, which is oxidized with oxygen under high temperature and high pressure to produce terephthalic acid and carbon dioxide.

Then, a catalyst is used, and after the reaction is completed, pure terephthalic acid is obtained through condensation, separation and other processes.

This method does not require very high reaction conditions or the use of large amounts of solvents, and has a relatively low production cost. However, the catalyst is highly active and needs to be replaced regularly.

Du Yimeng looked at the white crystalline powder with a slightly yellowish tint in front of her, her eyes full of excitement. She felt that chemistry was much more difficult than mechanics, but also very interesting.

Chemical elements each have their own unique properties, some active, others stable. This diversity makes chemical experiments full of surprises and endless unknowns.

For example, the wonderful reactions between various elements and compounds can produce what they want, such as the generation of gas, the formation of precipitation, etc.

With terephthalic acid, it is much easier to make terephthaloyl chloride. One of the most commonly used methods is the "thionyl chloride method".

Terephthalic acid is used as the raw material. In the presence of a small amount of catalyst, an acylation reaction is carried out. After heating and refluxing for ten hours, terephthaloyl chloride can be obtained with a yield of about 84%.

Another method is the phosgene method, which is to react terephthalic acid with phosgene in the presence of a catalyst to produce terephthaloyl chloride.

Finally, p-phenylenediamine and terephthaloyl chloride are subjected to a solution polycondensation reaction at low temperature to generate a polymer of terephthaloyl terephthaloyl.

"Xiao Du, is this diphenylenediamine?" Engineer Qiao asked in confusion, looking at the pale yellow solid in Du Yimeng's hand.

"Engineer Qiao, how come you don't even recognize this?" Wan Ping asked from the side. At that time, Comrade Du had just arrived at the institute, and the teacher hoped that they both would develop in an all-round way.

If he remembered correctly, this was the first chemical that Engineer Qiao taught them.

Engineer Qiao doesn’t even recognize what he has researched. Has he been exhausted and stupid during this period of time?

"Can it be used to make new materials?" Engineer Qiao ignored Wan Ping and asked Du Yimeng again.

"Yeah!" Du Yimeng nodded.

"Oh! I was holding a mountain of gold and mistook it for yellow mud!" Engineer Qiao said with regret on his face. It was he who invented diphenylamine, and he was very familiar with it.

Phenylenediamine is a white or light yellow solid at room temperature, but its solution can appear in different colors, such as yellow, orange or red, depending on its concentration and pH value.

When the concentration of phenylenediamine is low, its solution appears light yellow or greenish yellow. When its concentration increases, the solution appears orange or red.

It is one of the simplest aromatic diamines and an intermediate with a wide range of applications, but he did not know that it could be used in polymers.

So what did he do with the things he made?

He made hair dye for Qin Chulong and developed photos for everyone to make some private money. Look at what he did?

His face was full of grief and grief. He felt like he was treating his treasure like trash, which made him feel very uncomfortable.

"Prepare concentrated sulfuric acid." Du Yimeng could guess what Engineer Qiao was thinking without even thinking.

Chemistry is so magical that you will never know its other uses unless you experiment.

At this time, you can see the tacit understanding between Wan Ping and Du Yimeng. As soon as Du Yimeng shouted out what she wanted, Wan Ping was already ready.

"Keep the temperature at 51-100 degrees." Du Yimeng stated her requirements, and Wan Ping immediately adjusted the temperature.

Engineer Qiao, who was standing by, was brought back to his senses by Du Yimeng's voice and immediately got into work mode. He couldn't waste time in regret.

It’s because these two people cooperate so well with each other. If he doesn’t roll up his sleeves, he will be eliminated.

He had been knocked to the beach by the waves behind him. He couldn't let the waves knock him to death on the beach forever. He felt that he could still struggle a little longer.

The polyarylamine polymer is dissolved in concentrated sulfuric acid, and then the fiber is squeezed out from the spinneret at a temperature of 51-100°C. After passing through a small air layer, it falls into cold water for washing and is finally wound on a bobbin for drying.

The dried fiber is heat treated at 550°C under chlorine protection to obtain the final fiber?.

……

Time quickly came to mid-December, and it was snowing heavily outside. In the laboratory, there were not only Du Yimeng and the other three, but also Director Song, Director Wei, and Secretary Jiang.

Director Song said that he was innocent and did not want to be here, but Director Wei called from time to time to inquire about the situation.

He asked Du Yimeng at first, but he didn't understand anything she said to him, so he could only tell Director Wei that it would be soon.

Maybe Director Wei also noticed his perfunctory attitude, so Director Wei came in person today. No matter how strong the wind and snow were, they could not stop him.

Fortunately, his all-purpose Xiao Du is very helpful because the new material has finally been developed.

Everyone had different emotions, simply because what was placed in front of them was a thin piece of golden paper.

In the eyes of Wan Ping and Qiao Gong, this is not just a piece of paper, but a technological breakthrough.

But in the eyes of Du Yimeng, who is familiar with history, it is a piece of paper that foreign countries have used to hold China back for decades.

"Xiao Du, is this the new material?" Director Song asked uncertainly. This new material was a bit too thin.

You can't blame him for being ignorant. He deals with lumps of iron every day, and suddenly he has to deal with a piece of paper, so he is a little overwhelmed.

Engineer Qiao rolled his eyes at Director Song. When the new material was first made, it was very thin and light, like a feather. A sneeze could blow away a lot of it.

The so-called paper they see now is the result of their post-processing, and it is already very attractive, okay?

Du Yimeng didn't explain much. She felt that speaking with facts would be more convincing.

She picked up the screwdriver beside her and poked it into the new material. Everyone exclaimed in surprise.