At this time, there were already distillers.

The Tang Dynasty advocated Taoism, and the status of Taoist priests was very high.

With the emperor's pursuit of immortality, there are countless alchemists.

Fangshi alchemy, in fact, is some small heavy metal poison pills, which contain mercury, which is obtained with a distiller.

The distillers used to make mercury are monomeric and tend to bring out impurities. If it is to be used to make distilled spirits, the monomer will not work.

The distiller and the condenser must be separated, and the middle is connected with a conduit, so that the hot gas in the retort enters the condenser through the conduit and is re-condensed and liquefied, so that it is not easy to bring out impurities, and the condenser can be heated again for secondary distillation, or even multiple distillations, to extract higher purity alcohol.

The structure of this split distiller is actually not complicated, Wei Renshi gave lectures in later years and used a small model for experiments to explain the structure to students, in fact, the structure is the same, just need to enlarge it.

The only difficulty was how to use the existing technology to achieve the tightness required by the distiller without a rubber ring.

The rubber ring is made of rubber, not to mention that there is no rubber at the moment, even if you can find rubber trees from Southeast Asia to get rubber, it will not be made into a rubber ring.

So Wei Renshi thought of a few alternatives.

The first thing that came to mind was to use wax to seal the joint. But the wax melts at high temperatures, so this method doesn't work.

The second idea is to wrap a circle of cork around the inside of the still. Once closed, as the temperature of the still rises, the cork expands under the combined effect of heat and water vapor, which in turn makes the joints of the still tighter.

But when you think about it, it's very difficult to wrap the cork around the inside of the still. If you use fish bleach glue to glue, the fish bleach gum will dissolve with the high temperature after the distillation starts, causing the cork layer to move and fall, so you have to re-stick the cork once you don't use it, which is too troublesome.

Nails the cork in other ways affect the airtightness. In addition, after the cork expands under the high temperature of steam, it is difficult to open the still when it is opened, and it may even break the still in the process of expansion. If the gap of cork thermal expansion is left in advance, it will affect the airtightness at the beginning.

So it doesn't work that way.

Wei Renshi frowned.

The still can be made, but it is stuck at the interface for such a small point.

Is there any way to make it easy to open and close, but also to ensure airtightness, without worrying about high temperature steam?

I thought about it for a long time, but I couldn't come up with a reason.

"Lang Jun, Li Lang Jun is coming for you." Suddenly, there was a sound outside the door.

Wei Renshi went over and opened the door, and Xi'er and Li He stood outside. Li He was followed by Li Rong, who was carrying a bamboo basket with something wrapped in a cloth in it.

"Last time, thanks to Brother Renshi, I was able to be appreciated by Master Zhang, and if I am confused in the future, I can consult famous people." Li He said to Wei Renshi: "A-Niang asked me to send this to Brother Renshi to taste fresh." ”

"What are you still polite to me?" Wei Renshi smiled and pushed him over and said.

"I also said that I don't need to be polite to you, but A-Niang said that I should also express my gratitude." Li He turned his head to Li Rong and said, "Li Rong, you quickly take advantage of the failure to melt and go and give Renshi a taste." ”

"Okay!" Li Rong turned his head and got into the stove with a familiar way. Xi'er was curious, so she followed.

"What's not going to melt...... Ice? Wei Renshi was stunned for a moment and said, "Changji, where did you get the ice?" Do you have an ice cellar at home? ”

Li He shook his head and said, "My house is ruined now, where will there be an ice cellar?" It was my twenty-eighth uncle who sent a few pieces and some brown sugar. ”

Brown sugar is sucrose, but because there is no purification method at this time, it shows an amber color after making it, so it is called brown sugar.

"Twenty-eight? …… You Aye......" Wei Renshi was taken aback, there were so many uncles in this product!

"I'm twenty-nine." Li He said: "But those uncles are no longer alive, only twenty-eight uncles are still in Fuchang, and they can't walk anymore." ”

As he spoke, Li Rong had already run out of the stove and brought a few bowls, which were filled with some yellowish amber water, mixed with crushed ice slag floating in between.

"Wei Langjun, you use it first, I'll send some to the old lady." Li Rong handed over the bowl and said, then turned around and ran again.

"Ice water, put brown sugar, it's beautiful!" Li He said.

Wei Renshi drank his first cold drink in Datang.

The brown sugar has a hint of cane fragrance, and the cold and sweet taste slowly flows down between the mouth and tongue, and a refreshing coolness enters the heart and spleen, which is indescribably refreshing.

"How?" Li He asked.

"I'm going to make ice!" Wei Renshi put down the bowl and said word by word.

"Make ice?" Li He couldn't help laughing: "Can this ice still be made?" ”

"Of course, and it's easy to do." Wei Renshi remembered: "When the ice is made, I will make ice cream, smoothies, popsicles, ice juices, and ice soda...... Gee! ”

"I've eaten smoothies, and poured mashed fruit on them, which is particularly antipyretic." Li He said: "But what is the ice cream, the ice soda?" ”

"The ice cream is very delicious, and I will make it for you to taste when I have ice and milk." Wei Renshi said: "Ice soda...... I can't do that. There is steam in the water, and when you unscrew the lid, it can squirt far away, pour it down a few times, and then burp, it is called a comfortable ...... Ouch! Wring! ”

Wei Renshi suddenly clapped his hands: "That's right, screw!" Screw thread! ”

Li He was confused: "Renshi, what's wrong with you?" ”

"Nagayoshi, you're really too timely!" Wei Renshi excitedly patted Li He on the shoulder and laughed, "You have helped me a lot!" ”

As soon as he said that he could unscrew the cap, Wei Renshi suddenly had an idea in his mind and thought that he could use threads to ensure the tightness of the retort interface.

Although it is a bit troublesome to twist the polar ring when disassembling it, it is not too troublesome.

It can also ensure the tightness, and is easy to operate, without worrying about deformation caused by high temperature steam. Depending on the temperature of the distilled spirit, it cannot cause deformation of the threads.

Wei Renshi was excited and said, "Changji, I'll go to the study first." Wait a few days for you to come back, I will make you ice thanks, and teach you to have ice available at any time in the future! ”

With that, he went headlong into the study again.

Li He was stunned outside, smiled helplessly, and said to himself in a novel way: "Ice-how can you make it yourself?" Is it screwed out? ”

As he spoke, he twisted his fingers in the air: "Can this make ice?" ”