067 Acetic acid

Style: Science Author: fat man in wine glassWords: 2330Update Time: 24/01/12 14:50:14
It felt like the old lady asking the brunette to get the soybeans was a bit of a return gift, so he didn't try to return anything pretentiously and said "thank you" for opening the business.

Lin took out more than half a catty of soybeans, and Wang Qi put down a few taels of meat to make porridge.

When it was cooked a little thinner, he and Li Xiang divided it into two bowls. The rest were tasted in smaller bowls for the three people present to taste. There was still some left in the pot and they were allowed to share it among themselves.

Elena took a few bites with Lin's help and smiled again.

Maybe it's because the soybeans are boiled. Although it's a very simple combination, it's not necessarily better than the usual random stew. It just feels comfortable and relaxing.

Maybe it's because of people. If Lin were to cook it, she would definitely not be willing to use so much firewood, and the soybeans would not melt, and they might even be raw.

In Wang's cooking, he only cares about the taste, regardless of time and firewood consumption. He concentrates on watching the fire without worrying about possible dangers from the outside world. He is like a person frozen in the timeline before the disaster.

The tears that Elena could shed have dried up, but at this moment she really felt the glory of the Lord and was glad that the children chose to come here.

Wang Qi was not so sentimental. He just made breakfast and shared it with Li Xiang before getting busy with the future.

"Thank you for the beans. If you feel unwell, you can come to me. Maybe I can do something." Before leaving, he was vaccinated in broken local language.

"We should thank you, King."

Wang Qi was not interested in repeated politeness, and after nodding, he pulled Li Xiang away.

With his new neighbor here, Wang Qi no longer intends to waste several hours every day staring out the window, and Li Xiang can be liberated as well.

It will take a few days to wait for the sleds to dry out, so I will do indoor work during these days.

After breakfast, Li and I wanted to rearrange the traps on our side.

Wang Qi knows very little about traps and can only make noise traps with little attack power.

Although Li Xiang is young, he is much more professional than Wang Qi in this aspect.

They adjusted the debris piles originally used to block roads in the corridors on the third and fourth floors, and added two traps inside, one on the third floor and one in the debris pile moved up.

There was no deliberate effort to enhance or increase the traps above the elevator, because Wang Qi believed that if an intruder encounters an attack trap in the stairwell and avoids it cautiously or by luck, there is a high chance that he will continue to go upstairs instead of going around and trying to climb the elevator shaft. The idea of ​​"there are resources behind the trap" can greatly increase the triggering probability of the debris pile noise trap.

In order to make the two traps have the intended effect, the two people worked hard. They first cleaned to prevent dust from showing footprints, and the 2nd to 4th floors of the stairwell were all shaded. The fishing line used as the trigger device was also matted (using Rub with sand).

It was almost dawn after work, and Li Xiang, who had not had much rest, had to go to class again.

In Li Xiang's course, the model teaching has been completed, and he has mastered the tumbling and lunging training well enough, but he is still growing taller and needs to maintain half an hour of adaptation training every day.

In other words, apart from cultural classes, I no longer have any burdens, and I basically follow Wang Qi around all day long.

Wang Qi had never taught anyone before, and the cultural classes were very simple, with only bilingual classes and basic arithmetic. There was no pressure. Wang Qi and Li Xiang helped each other translate a hundred words a day and read them once. They had a ten-minute arithmetic lecture and three homework questions. I got off work regardless of whether I was right or wrong, and Wang Qi helped me correct my mistakes before class the next day.

This little thing was finished in just over an hour.

In the next few days while the sleds are deactivated, the focus will have to return to developing uses for alcohol.

If the alcohol is only used to clean and wipe wounds, the large box in your hand will be a waste.

It is impossible to mix water with wine. Drinking in peacetime will only cause trouble, but drinking here may be fatal.

After careful consideration, I felt that it would be better to use it to make acetic acid.

The cleaning ability of alcohol comes from the strong organic dissolving ability of organic solvents, which can more easily disintegrate old stains. Unfortunately, alcohol has a neutral pH value and cannot remove rust chemically, which greatly reduces its use in waste. value in the local environment.

Fortunately, alcohol is relatively active and can be easily processed into other things. The acetic acid in it is a real rust remover.

There is no need for particularly pure acetic acid, only the alcohol needs to be partially converted into acetaldehyde and acetic acid before it can be used.

It’s not difficult to make. You just need to add copper and silver as catalysts and heat it to complete it... I remember correctly, anyway, you won’t lose much alcohol if it can’t react.

There is a certain risk in the experiment. The acetaldehyde in the intermediate product volatilizes and mixes with air, which may cause an explosion.

But Wang Qi decided to give it a try.

Copper is easy to obtain, and silver has not been collected before.

I remember that I had discovered a few places that used candles for religious purposes. I made a special trip and got a package of silver candlesticks and silver tableware. I also used a backpack to transport all the gadgets that I had marked earlier but had not brought back from several places including the Fisherman’s House. return.

The old way of getting silver and copper is to manually sand wash to remove the rust/oxide layer.

To prevent an explosion, we went to the roof of the building and built a temporary stove using bricks picked up nearby for heating.

When ethanol is heated, it requires oxygen to react further. It's easy to supply air. Just two pieces of wood and a piece of cloth, lightly smeared with reptile grease, and a non-return piece can barely act as a bellows. Exhausting the gas is very troublesome. It is necessary to cool down the recovered liquid and discharge the remaining gas. Wang Qi went to a nearby place and dismantled the copper pipes of air conditioners to get enough length to prevent the flammable gas from escaping before it cooled down.

After exploding several glass bottles and controlling the heat more and more carefully, I finally produced a mixture of ethanol, acetaldehyde, and acetic acid after a few days.

The specific ratio has not been measured. He directly tested it with rusted parts. It works, and it is much more efficient than manual sand washing.

Sand washing has a big drawback, because it mainly uses the quartz component in the sand to remove rust. If it is completely removed, the damage to the surface of most materials will be slightly serious. The surface loss of acetic acid rust removal will be smaller, and it is more suitable for repairing moving parts such as gear sets and connecting rod structures that require a certain degree of meshing accuracy, but the reaction time must be controlled.

Of course, rust will perforate some materials under certain circumstances, and no one can save it.

Get the rust remover and go to the gym on the fourth floor to demolish the guy as soon as possible.

There are many useful parts in the fitness equipment, and he plans to use them to build a small pulley crane to replace the shabby crane arm used for processing furniture. The I-beam is strong, but the wear and tear on the steel strands caused by the cross-section is really distressing, and there are no suitable tools to chamfer it smoothly enough.

Change it to a pulley crane and use a nylon survival rope to send the mantis directly to the fourth floor without the need for dissection outside the building.

The work outside the building seems clean and hygienic, but in fact it can only be used in winter. The spreader will have to be replaced sooner or later. Wang Qi originally planned to use the trunk of a small oak tree on the first floor as a boom when winter is about to end. Now that there is rust remover, you can try it. Can it be modified directly with fitness equipment?

I used a rusty tape measure to measure the pile of junk. After staring at it for a long time, I found that it didn't seem to work.

It works, but it lacks metal processing, especially welding methods, and the crane arm modified from a fitness machine is too short. There is no point if the crane arm is not long enough, because if the thing is small enough, Wang Qi's physical ability to carry hundreds of kilograms of things upstairs is not impossible.

The boom still depends on the small oak wood, but the skis are not completely deactivated now. The small oak wood has to wait for at least another month, otherwise there is no telling how it will deform when exposed to snowfall.

Now prepare the pulleys, rocker arms, counterweights, frames and other structures, remove rust, oil and maintain them.

Next, repair the sled and go hunting.