Where do you think the urea for medical use is extracted from?

The first step is to obtain fossil energy such as alkanes or coal through mining. In the second step, alkanes or coal and water (don't ask me where the water comes from) generate carbon oxides at high temperatures (mainly carbon monoxide and carbon dioxide, carbon dioxide will be used later, so excess carbon monoxide should continue to oxidize, so as to further obtain carbon dioxide) and hydrogen (hydrogen and carbon dioxide should be further separated, generally using an absorbent solution such as Benfil solution, washing mixed gas, absorbing carbon dioxide). In the third step, hydrogen and nitrogen are used to synthesize ammonia (nitrogen is everywhere).

In the fourth step, the previously obtained carbon dioxide is combined with ammonia to synthesize urea. With these four steps, coal or natural gas becomes urea, and you see how amazing chemistry is. Of course, the specific process is very complicated, and it takes a year and a half to learn how to do it.

Of course, it can also be extracted directly from the urine, and the reason why you don't do this is not because the urine is not very clean, but because the urine is not enough. <>

In the early 80s, when the Sino-Japanese honeymoon period first began, Chinese people generally admired Japanese technology even more.

At that time, there was a widespread legend that China was short of fertilizers, so it bought tens of thousands of tons of urea from Japan. As soon as the contract was signed, the Japanese ship left the dock and set off.

When the ship was sailing, a Chinese ** boarded the ship to visit, and then he was shocked: it was an empty ship, and there was not a ton of urea on it (strictly speaking, it was not completely empty, and there were many empty bags for urea on it). Not only was there no urea, but there was not even any raw material for the manufacture of fertilizers that the Chinese could think of at that time (it was later added that there was some coke on board).

A month later, the fertilizer ship drove slowly to Shanghai, and the ** boarded the ship to check and found that it was full of tens of thousands of tons of fertilizer. ** I was scared to pee at the time (he also made a small amount of urea). Without scientific knowledge, without industrial knowledge, he could not imagine how the Japanese could conjure tens of thousands of tons of urea out of thin air, so the story was spread as a myth.

The veracity of this story is quite questionable, because no matter how advanced the Japanese are, there is no need to build a fertilizer plant on a ship, but the fact that this legend was born shows at least one thing: there is no "chemical raw material" that is commonly understood to be able to make urea

1. Hydrogen production by electrolysis of water: 2H2O = energized = O2 + 2H2;

2. Haber ammonia method: N2 + 3H2 2NH3 (under the conditions of 200 atmosphere pressure and 500 °C, iron oxide is used as a catalyst);

3. Urea is made from ammonia and carbon dioxide: 2NH3+CO2 NH2COONH4 CO(NH2)2+H2O.

Water is obtained from the sea, nitrogen is obtained directly from the air, and carbon dioxide can be made from coke. Only water, nitrogen and carbon dioxide are needed to make urea.

Urea is a common chemical that is widely used in the medical field. You may be curious, what is the extraction of urea for medical use?

In fact, urea for medical purposes is not extracted from the urine of humans or animals. It is usually obtained by a synthetic method. Specifically, urea for medical use is synthesized by a chemical reaction between natural ammonia and carbon dioxide.

This process is usually done in a laboratory. Ammonia is reacted with carbon dioxide at high temperatures and pressures to produce urea and water. The urea is then purified and made into powder or crystalline form through steps such as cooling and distillation.

Because urea can be quickly dissolved in aqueous solution and is colorless and odorless, it is widely used in various medical fields, such as kidney dialysis, ** nursing, and pharmaceutical preparations. It has good moisturizing properties and permeability, which can help** retain moisture and reduce discomfort such as dryness and itching.

Medical urea can also be used for certain conditions, such as psoriasis and eczema. It softens and removes the stratum corneum, reduces inflammation and itching, and promotes wound healing. Therefore, in some departments, doctors also recommend urea preparations.

To sum up, urea for medical use is obtained by synthetic methods and is not extracted from human or animal urine. It is widely used in the medical field and has the effect of moisturizing, penetrating and **some** diseases. If you need to use urea products, please consult your doctor for advice and choose a product that has a good reputation.

The above is your problem, I hope it can help you. If you have any other questions, please feel free to continue to consult.

The urea preparation method used in medicine is as follows:

1. Ammonium carbamate is synthesized by carbon dioxide and ammonia at high temperature and high pressure, and after decomposition, absorption and conversion, crystallization, separation and drying;

2. The purified ammonia and carbon dioxide are mixed into the synthesis tower, the pressure in the tower is to megapascals, the temperature is 180 to 200 degrees Celsius, the residence time of the reaction material is 25 to 40 minutes, the urea solution containing excess ammonia and ammonium carbamate is obtained, and the urea solution after separating ammonia and ammonium carbamate is evaporated to more than 10% after the pressure drop is reduced, and finally the urea finished product is obtained by granulation in the granulation tower;

3. The final product of protein metabolism in mammals in urea, in 1922, the industrial production of urea synthesized with ammonia and carbon dioxide was realized in Germany, and ammonia reacted with carbon dioxide to form carbamate amine, and then dehydrated to produce urea.

The urea preparation method used in medicine is as follows:

1. Ammonium carbamate is synthesized by carbon dioxide and ammonia at high temperature and high pressure, and after decomposition, absorption and conversion, crystallization, separation and drying;

2. The purified ammonia and carbon dioxide are mixed into the synthesis tower, the pressure in the tower is to megapascals, the temperature is 180 to 200 degrees Celsius, the residence time of the reaction material is 25 to 40 minutes, the urea solution containing excess ammonia and ammonium carbamate is obtained, and the urea solution containing excess ammonia and ammonium carbamate is evaporated to more than 10% after decompression and cooling, and finally the urea finished product is obtained by granulation in the granulation tower;

3. In 1922, the industrial production of urea synthesized urea from ammonia and carbon dioxide was realized in Germany, and ammonia reacted with carbon dioxide to form carbamate amine, and then dehydrated to produce urea.

Allantoin is a substance that is widely used in the field of medicine and cosmetics, so what about the extraction of **? In fact, allantoin is extracted from urine.

Urine is a type of metabolite of the human body, which contains components such as urea, uric acid, and creatinine. Among them, urea is a nitrogenous compound that can be converted into allantoin through a chemical reaction. Therefore, urine hunger is the raw material of allantoin**.

In order to extract allantoin, the urine needs to be processed to remove unwanted components, and then isolated and purified. Commonly used methods include crystallization, ion exchange, gel filtration, etc.

Allantoin has moisturizing, antibacterial, anti-inflammatory and other effects, so it is widely used in cosmetics. At the same time, it is also an important medical substance, which can be used for wounds, ulcers and other diseases.

Although urine is not considered a precious substance in people's daily lives, through the process of extracting allantoin, we can make full use of the resources in urine and provide better raw materials for the medical and cosmetics industries.

The answer does not seem to be the key, the question has become a matter of attitude, and many people ridicule it for some reason, and it is not surprising that urea was extracted from urine in the early days.

Medicinal urea is not extracted from urine, which does not mean that it cannot be used in medicine. Urea is no longer extracted from urine because of its simple chemical preparation, but it is not used in medicine.

Urine or urine is the liquid excrement of humans and vertebrates through the urinary system and urinary tract for metabolic needs. Excreted urine regulates the balance of water and electrolytes in the body and removes metabolic wastes, especially nitrogenous compounds produced by degenerative proteins and nucleotides

It is emphasized here that it is not that the subject has a disease in the brain, it is those who are cynical and have a disease in the brain, those people do not necessarily really know why the urea in medicine is not extracted from the urine, in their subconscious, the medicine used by people cannot be extracted in the urine, and the medicine used by people at that time can also be extracted from the urine, and the urokinase that is now widely used in clinical practice is mainly the urine of healthy people.

Urokinase is a thrombolytic enzyme with good effect, which is mainly used for ischemic diseases caused by thrombosis, such as cerebral thrombosis, myocardial infarction, acute pulmonary embolism and other diseases.

The conclusion is that urea can indeed be extracted from urine, and the Chinese name itself is indeed related to urine, and urine extract can indeed be used for drugs, medical urea is not extracted with urine is not because urine and urea have nothing to do with it, nor because urine extract can not be used for medicine, the key is that the cost of preparation and purification determines which to use

Urine (urine) is produced by the kidneys and excreted through the ureters and bladder as a fluid containing large amounts of metabolic end products. Its composition: water accounts for 96%-97%, others are urea, uric acid, creatinine, ammonia and other non-protein nitrogen compounds, sulfate, etc.

If there is no simple preparation method, medical urea will be replaced with urine extract, so there is nothing wrong with the subject's question, it is not ridiculous at all, but those who know half and pretend to understand the answer is even more ridiculous.

Urea in the human body is mainly synthesized and produced by the liver under the action of a series of enzymes to produce ammonia produced by amino acid metabolism, and then excreted through the kidneys. When kidney function declines, the concentration of urea nitrogen in the blood increases, and other metabolites accumulate, which can affect the organs and organs of the whole body and cause abnormal function. In industry, liquid ammonia and carbon dioxide are used as raw materials, and urea is directly synthesized under high temperature and high pressure conditions and catalysts.

The urea in fertilizers is chemically synthesized, not extracted from animal urine. Urea can be obtained by direct synthesis of ammonia and carbon dioxide under high pressure.

Ammonium carbamate is synthesized with carbon dioxide and ammonia at high temperature and high pressure, and is crystallized, separated and dried after decomposition, absorption and conversion.

It was originally extracted from urine, but later it could be synthesized.

The biochemistry course at the university has the formula urea.

Of course not, chemical methods can be extracted.

No, he extracted it by special means.

No, he extracted it from something else.

Medicated urea is not extracted from urine,

No, it can be made chemically.

Probably not, he should be synthetic.

Urea used in medicine is not extracted from urine; The urea preparation method used in medicine is as follows:

1. Ammonium carbamate is synthesized by carbon dioxide and ammonia at high temperature and high pressure, and after decomposition, absorption and conversion, crystallization, separation and drying;

2. The purified ammonia and carbon dioxide are mixed into the synthesis tower, the pressure in the tower is to megapascals, the temperature is 180 to 200 degrees Celsius, the residence time of the reaction material is 25 to 40 minutes, the urea solution containing excess ammonia and ammonium carbamate is obtained, and the urea solution containing excess ammonia and ammonium carbamate is evaporated to more than 10% after being cooled under reduced pressure, and finally the urea finished product is obtained by granulation in the granulation tower;

3. The final product of protein metabolism in mammals in urea, in 1922, the industrial production of urea with ammonia and carbon dioxide was realized in Germany, and ammonia reacted with carbon dioxide to form carbamate amine, and then dehydrated to produce urea.

Medical urea is synthetic.

Isn't it possible to synthesize urea a long time ago?

Apparently not an extract.

This is the part of the urine circulation and absorption

Liquid x is blood. Y is urine.

Plasma passes through the glomeruli's filtration barrier (proteins are not allowed to pass through!). After that, it becomes raw urine.

The original urine is reabsorbed by the hail of the renal tubular lumen (glucose is eliminated and sucked up, and it is as round as it is received!). After that, it becomes urine.

So the site where x is in front of the glomerulus can be collected, and the site where y is behind the tubules can be collected.

What is urea made of and why is it transparent?! Urea grinder! Cage grinder.

Urea is suitable for a variety of soils and plants.

Urea, also known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen, also known as urea, which is a white crystal. One of the simplest organic compounds. Diamide of carbonated with the molecular formula H2NCONH2 (Co(NH2)2) and molecular weight 60.

The main nitrogenous end product of protein metabolism in mammals and some fish.

Urea is a highly concentrated nitrogen fertilizer, which is a neutral fast-acting fertilizer, and can also be used to produce a variety of compound fertilizers. No harmful substances remain in the soil, and there are no adverse effects after long-term application. Animal husbandry can be used as feed for ruminants.

However, if the temperature is too high in granulation, a small amount of biuret will be produced, also known as biuret, which has an inhibitory effect on crops. China stipulates that the content of urea biuret for fertilizer should be less than. When the content of biuret is more than 1%, it can not be used as seed fertilizer, seedling fertilizer and foliar fertilizer, and the urea content in other application periods should not be too much or too concentrated.

Urea is an organic nitrogen fertilizer, which can be absorbed and utilized by crops after being hydrolyzed into ammonium carbonate or ammonium bicarbonate by urease in the soil. Therefore, urea should be applied 4 to 8 days before the fertilizer requirement of the crop.