I Am the President of the University

Guanghua University Lactide Technology Laboratory.

The laboratory was like a vegetable market, bustling with people.

Chen Chong watched all the researchers in front of him participate in the discussion, with a bright smile on his face.

He tilted his head slightly and said with a smile to Professor Fang Haosen beside him, "The most important part of improving your level is to participate. We cannot just do whatever we say. We must cultivate our own dialectical thinking ability. Professor Fang, what do you think?" "

"I think it's very good. Let's listen to everyone's opinions first. Maybe it will be an inspiration to us." Professor Fang nodded, also agreeing with this approach.

Some instructors only want obedient scientific research tools, but this behavior is prohibited at Guanghua University.

Chen Chong and Fang Haosen are not such people. Guanghua University not only wants to cultivate students with their own dialectical thinking, but also researchers in the scientific research field.

Even in the future, if you use it alone, you can set up a research group on your own.

Guanghua does not need tool people who can only obey without thinking. What it needs is a complete "person" who can think!

"Pop!"

After looking around, Chen Chong saw that the time was almost here and clapped his hands. After everyone calmed down, he said with a smile: "How is everyone's discussion going? What are your thoughts on the crystallization method?"

A girl with double eyelids in a ponytail said boldly: "Director, I think we should use the recrystallization method."

"Oh? Then tell me your reasons." Chen Chong did not refute, but encouraged with a smile.

As if being encouraged, the girl with the ponytail, who was nervous just now, felt a lot more at ease. \\bPuckered her lips and said:

"There are many methods for purifying lactide, but there are three commonly used methods in the industry, which are recrystallization, gas-assisted evaporation, and hydrolysis. The solvent recrystallization method is currently used more frequently in major laboratories and is also the most commonly used method. It’s common. I think the recrystallization method is more mature, and since we are short of time, this is the safest choice.”

Perhaps the girl with the ponytail came forward and gave others a lot of confidence. After the girl with the ponytail finished speaking, a boy couldn't help but jump out and refute.

"I don't choose the recrystallization method! The recrystallization yield is generally not high, so we can't prepare polylactic acid with high molecular weight at all!"

The girl with the ponytail did not panic at all, looked directly at the other person, and responded forcefully: "You are talking about the single-solvent single recrystallization method in the past. Now a multiple-solvent recrystallization method has been developed, which can greatly improve lactide. yield.”

"I think it's still wrong. We should choose the gas-assisted evaporation method!\\b"

"What's wrong? Then why don't you first tell me what's wrong with the multiple recrystallization method of composite solvents?" The girl with the ponytail glanced at the other party lightly.

"This..." The boy opened his mouth, but finally chose to remain silent.

He didn't pay much attention to this. He objected only because he was concerned about and agreed with the Qi-assisted evaporation method.

However, Chen Chong glanced at the girl with the ponytail in surprise.

He remembered that the other person's name was Xia Yao, and she graduated with a doctorate from Fudan University.

Chen Chong looked at the other party and said with a smile: "Xia Yao's talk is good, but I also want to test you. How much do you know about the multiple recrystallization method of composite solvents?"

Xia Yao looked serious and replied: "I saw Professor Cui Qing's article in the "" journal before, which mentioned this composite solvent multiple recrystallization method. Since the yield of a single recrystallization with a single solvent is generally If it’s not high, then use the composite solvent multiple recrystallization method.”

"The purity of lactide obtained by recrystallizing it once with ethanol cannot meet the requirements. Therefore, you can first recrystallize it with ethanol twice to obtain a higher recrystallization yield, and then recrystallize it once with ethyl acetate to effectively remove By eliminating the residual hydroxyl groups in lactide, the yield of refined L-lactide can reach 35.4%!”

Seeing Xia Yao's gaze, Chen Chong first gave some encouragement.

"Not bad, not bad. It can be seen that Dr. Xia has not relaxed his studies on weekdays."

Then the conversation changed and he shook his head and said: "Professor Fang and I have also discussed the multiple recrystallization method with composite solvents, but the purification effect is still not enough."

The two major difficulties in lactide technology are the synthesis process and the purification process.

Lactide contains certain impurities such as lactic acid, lactic acid dimers, trimers, and trace amounts of water. Among them, lactic acid monomers, lactic acid dimers, and trimers are acidic impurities, and their presence will affect the preservation of polylactic acid. It is difficult to produce polylactic acid, which can easily damage the molecular chain and cause it to be re-hydrolyzed into lactic acid, resulting in a reduction in the polymer quality of polylactic acid.

Therefore, the purification process is very important and will affect the quality of the final lactide produced.

There are three processes from crude lactide to refined lactide:

Crude lactide—lactide crystallization—filtration—drying—refined lactide.

The most difficult purification process is the "lipid crystallization" step.

"Director, I know what you are saying, but there are many challenges when choosing the gas-assisted evaporation method or the hydrolysis method. For our current situation, I think the composite solvent multiple recrystallization method is not necessarily the best choice. , but it must be the most suitable choice," Xia Yao insisted.

\\b"That's not necessarily true. Does anyone else have their own opinions? You can all speak freely!" Chen Chong pretended to smile mysteriously, and then looked at everyone with expectant eyes.

A boy took a deep breath and stood up.

"Director, I have my own opinions on the hydrolysis method..."

Half an hour passed in a flash.

\\bChen Chong's eyes were a little disappointed. In the past half hour, the number of people supporting Xia Yao's multiple recrystallization method with composite solvents was the largest, followed by the hydrolysis method, which was the second person to stand up and explain his ideas. However, the gas-assisted evaporation method was the least supported. of.

"Does anyone else have any other opinions? Without me, I will announce my and Professor Fang's ideas." Chen Chong asked again.

Only this time, he didn't have any expectations.

Just as he was about to announce the final results, a trembling hand stretched out from the middle of the crowd.

Through the crowd, when Chen Chong saw clearly the appearance of the person raising his hand, he smiled.

\\b"Classmate Tian Ziang, tell me what you think."

In the lactide laboratory, Tian Ziang is the only outlier.

There are more than 30 researchers, only a few of whom are master's degree graduates, and the rest are PhDs or postdoctoral fellows from 985 prestigious universities at home and abroad.

Tian Ziang’s identity is... an undergraduate student in materials engineering at Guanghua University...

Not to mention a graduate student, I didn't even graduate from an undergraduate degree.

The reason why it appeared in the lactide laboratory was because it needed manpower support and was transferred from the photon screen laboratory.

The reason why the other party is in the photon screen laboratory is just a work-study program, commonly known as a handyman!

It's like a husky mixed in with a pack of wolves.

The faces of the few people who were transferred with Tian Ziang were calm. After getting along with each other for a while, they knew how amazing this "little" friend's learning talent was!

From an undergraduate who came into contact with the laboratory for the first time and didn't understand anything, to the questions they asked later that they couldn't answer...

Anyone who underestimates him will be slapped in the face later!

The other twenty or so people who had not had much contact with Tian Ziang looked at each other with strange eyes.

There were even a few looks filled with contempt and disdain.

An undergraduate from a non-university can also do scientific research?

He knows nothing!

When did the threshold for scientific research drop to undergraduate students?

Facing all kinds of looks, Tian Ziang was still a little nervous, but at this time, he was not the inferior and timid self he had been when he was eating soup and rice in the cafeteria.

He clenched his hands on the sides of his pants, bit his lip, and said, "I... I have checked a lot of literature on lactide recently, and among them there is a lactide purification method that I think is quite good. The novel method of purifying lactide by continuous distillation is quite interesting. I think this method can be used as a reference.”

As soon as he finished speaking, several sneers sounded.

What followed was a flood of opposition and ridicule.

"I'm laughing so hard. This method is only theoretically possible, but it's too difficult to implement and it's impossible to do!"

"I've seen this before, I really didn't think anyone would take it seriously, hahaha, what a talent!"

"Ahem, I think you should read more and have a dialectical way of thinking to look at these ideas."

Several boys who were speechless by Xia Yao, a female prostitute, seized this opportunity to refute Tian Ziang's point of view from the commanding heights of experience.

Dr. Xia Yao did not stand up to speak, but her eyes flickered and she was lost in thought.

Even Professor Fang Haosen couldn't stand it anymore and stood up, looking directly at the boys with a serious face.

"Is it funny?"

"I think it's you who are ridiculous!"

When several boys heard this, they were immediately at a loss.

Could this undergraduate be right?

Chen Chong glanced at those people with disappointment, and then nodded approvingly to Tian Ziang.

"I really didn't expect that among more than 30 master's degrees, Ph.D.s, and even Ph.D.s from Caltech and Harvard University, the most insightful person turned out to be an undergraduate..."

The sound fell, and the entire laboratory fell into dead silence.

ps: Damn it, the 1 million word achievement has been achieved! ! ! ??

It’s really not easy. I actually insisted on writing 1 million words and strived to achieve the next goal of 1.5 million words!

Dear students, you have to go for recommended tickets and monthly tickets! ! !