常用名 | 尿素 | 英文名 | |
CAS号 | 分子量 | 96.51620 | |
密度 | 1.335 g/mL at 25ºC(lit.) | 沸点 | 196.6ºC at 760 mmHg |
分子式 | CH5ClN2O | 熔点 | 132-135ºC(lit.) |
Common name urea
English name urea
CAS No. 506-89-8
Molecular weight 96.51620
Density 1.335 g/mL at 25 º C (lit.)
Boiling point 196.6 º C at 760 mmHg
Molecular formula CH5ClN2O
melting point 132-135 º C (lit.)
Urea English alias
Urea HCl |
amino ketone hydrochloride |
Urea,hydrochloride (1:1) |
Urea hydrochloride |
EINECS 208-059-6 |
EINECS 200-315-5 |
Harnstoff,Hydrochlorid,monohydrochloride |
urea hydrochloride salt |
MFCD00008022 |
Urea,monohydrochloride |
Uronium-chlorid |
Industrial urea is not allowed for industrial use, and the difference between agricultural urea and agricultural urea is that there are fewer impurities in agricultural urea. The biuret content of agricultural urea is slightly higher than that of industrial urea, and there are certain requirements for biuret and water repellent substances. In addition, the purity is high, which forms a thin layer of urea formaldehyde coating on the surface of urea particles to reduce costs. So, what are the roles of urea in industry and agriculture? Let's take a look together with Hengyi Chemical!
The role of urea in industry
The industrial application scope of urea is constantly expanding. According to incomplete statistics, urea used as an industrial raw material accounts for about 10% of the total production worldwide, especially in industrialized countries such as North America and Western Europe, where urea accounts for a considerable proportion of industrial raw materials.
In the organic synthesis industry, urea is used to produce high polymer synthetic materials. Urea-formaldehyde is used in the production of plastics, paints and adhesives, and can also be used as the raw material of melamine resin.
In the pharmaceutical industry, urea can be used to produce dozens of chemicals such as Nitrofurazone, urea grease, Barbital, lumina, Diuretic, etc; Sometimes as the main raw material, sometimes as an additive to play a certain role.
In the petroleum industry, urea is used as a dewaxing agent in the petroleum refining process.
In the Textile manufacturing, urea is used to manufacture urea containing polymers, which are used as the raw material of Youlun, one of the Synthetic fiber. Urea is also used as a softener for fiber products.
Urea is also commonly used in the production processes of leather and pigments. Urea is also used as a pollution control agent abroad to absorb pollutants and protect the environment. The free ammonia released by the decomposition of urea can inhibit the generation of microorganisms and prevent grain from becoming moldy during storage.
Urea can be further processed into melamine, which is then condensed with formaldehyde to form melamine formaldehyde resin (commonly known as melamine resin). As one of the important chemical raw materials, this resin has a wide range of applications in coatings, plastics, wood processing, papermaking, textiles, and other fields, and is closely related to people's lives; Moreover, other new products using melamine as raw material are constantly being developed, with great market potential and a high demand for urea in this regard.
Urea can also be used to make coating co solvents, fiber softeners, anti icing agents, petroleum refining agents, plastic foaming agents, fabric anti wrinkle agents, bleaches, and so on. Urea is also used as the nitrogen source for fermentation bacteria in the production process of monosodium glutamate. In addition, urea is used as a stabilizer in explosive manufacturing and as a foaming agent in mineral processing. Urea is also used to manufacture developers.
The Application of Urea in Agriculture
Urea has a high nitrogen content and is currently the most commonly used high-quality nitrogen fertilizer in production. However, the utilization rate of urea when applied to soil is usually only around 40-50%. Far from achieving the effect of fertilizer, how can farmers improve the utilization rate of urea in actual production?
1、 Deep application
Whether urea is used as base fertilizer or topdressing, it should be deeply applied to the soil, with a fertilization depth of 10-12 centimeters being appropriate; Deep application of urea can significantly improve utilization efficiency. According to experiments, urea surface application or shallow application of 2-3 centimeters results in a utilization rate of only 30%; Fertilization depth of 5 centimeters, utilization rate of 45%; Deep application of 10-20 centimeters can achieve a utilization rate of 65%.
2、 Early application
Urea belongs to the acyl ammonium nitrogen fertilizer, which cannot be directly absorbed and utilized by crops after being applied to the soil. It needs to be converted into ammonium nitrogen under the action of urease in the soil to be absorbed by the root system; If applied too late, it not only hinders the utilization of fertilizer efficiency, but may also cause crop growth and late ripening.
3、 Foliar spraying
Urea is easily soluble in water, has strong diffusivity, is easily absorbed by leaves, and has little damage to leaves. It is suitable for topdressing outside roots, and can be sprayed on leaves in combination with crop Pest control. But when applying topdressing outside the roots, urea with a biuret content not exceeding 2% should be selected to prevent damage to the leaves. The concentration of topdressing outside the roots varies depending on the crop. The spraying time should be after 4pm, when the transpiration is small and the leaf stomata gradually open, which is conducive to the full absorption of urea aqueous solution by crops.
4、 Combined application with other fertilizers
Urea should be applied in combination with Manure, phosphorus potassium fertilizer and microelement fertilizer to maintain the balance of soil nutrients, maximize the nutrient utilization rate and play the role of fertilizer in increasing production.
常用名 | 尿素 | 英文名 | |
CAS号 | 分子量 | 96.51620 | |
密度 | 1.335 g/mL at 25ºC(lit.) | 沸点 | 196.6ºC at 760 mmHg |
分子式 | CH5ClN2O | 熔点 | 132-135ºC(lit.) |
Common name urea
English name urea
CAS No. 506-89-8
Molecular weight 96.51620
Density 1.335 g/mL at 25 º C (lit.)
Boiling point 196.6 º C at 760 mmHg
Molecular formula CH5ClN2O
melting point 132-135 º C (lit.)
Urea English alias
Urea HCl |
amino ketone hydrochloride |
Urea,hydrochloride (1:1) |
Urea hydrochloride |
EINECS 208-059-6 |
EINECS 200-315-5 |
Harnstoff,Hydrochlorid,monohydrochloride |
urea hydrochloride salt |
MFCD00008022 |
Urea,monohydrochloride |
Uronium-chlorid |
Industrial urea is not allowed for industrial use, and the difference between agricultural urea and agricultural urea is that there are fewer impurities in agricultural urea. The biuret content of agricultural urea is slightly higher than that of industrial urea, and there are certain requirements for biuret and water repellent substances. In addition, the purity is high, which forms a thin layer of urea formaldehyde coating on the surface of urea particles to reduce costs. So, what are the roles of urea in industry and agriculture? Let's take a look together with Hengyi Chemical!
The role of urea in industry
The industrial application scope of urea is constantly expanding. According to incomplete statistics, urea used as an industrial raw material accounts for about 10% of the total production worldwide, especially in industrialized countries such as North America and Western Europe, where urea accounts for a considerable proportion of industrial raw materials.
In the organic synthesis industry, urea is used to produce high polymer synthetic materials. Urea-formaldehyde is used in the production of plastics, paints and adhesives, and can also be used as the raw material of melamine resin.
In the pharmaceutical industry, urea can be used to produce dozens of chemicals such as Nitrofurazone, urea grease, Barbital, lumina, Diuretic, etc; Sometimes as the main raw material, sometimes as an additive to play a certain role.
In the petroleum industry, urea is used as a dewaxing agent in the petroleum refining process.
In the Textile manufacturing, urea is used to manufacture urea containing polymers, which are used as the raw material of Youlun, one of the Synthetic fiber. Urea is also used as a softener for fiber products.
Urea is also commonly used in the production processes of leather and pigments. Urea is also used as a pollution control agent abroad to absorb pollutants and protect the environment. The free ammonia released by the decomposition of urea can inhibit the generation of microorganisms and prevent grain from becoming moldy during storage.
Urea can be further processed into melamine, which is then condensed with formaldehyde to form melamine formaldehyde resin (commonly known as melamine resin). As one of the important chemical raw materials, this resin has a wide range of applications in coatings, plastics, wood processing, papermaking, textiles, and other fields, and is closely related to people's lives; Moreover, other new products using melamine as raw material are constantly being developed, with great market potential and a high demand for urea in this regard.
Urea can also be used to make coating co solvents, fiber softeners, anti icing agents, petroleum refining agents, plastic foaming agents, fabric anti wrinkle agents, bleaches, and so on. Urea is also used as the nitrogen source for fermentation bacteria in the production process of monosodium glutamate. In addition, urea is used as a stabilizer in explosive manufacturing and as a foaming agent in mineral processing. Urea is also used to manufacture developers.
The Application of Urea in Agriculture
Urea has a high nitrogen content and is currently the most commonly used high-quality nitrogen fertilizer in production. However, the utilization rate of urea when applied to soil is usually only around 40-50%. Far from achieving the effect of fertilizer, how can farmers improve the utilization rate of urea in actual production?
1、 Deep application
Whether urea is used as base fertilizer or topdressing, it should be deeply applied to the soil, with a fertilization depth of 10-12 centimeters being appropriate; Deep application of urea can significantly improve utilization efficiency. According to experiments, urea surface application or shallow application of 2-3 centimeters results in a utilization rate of only 30%; Fertilization depth of 5 centimeters, utilization rate of 45%; Deep application of 10-20 centimeters can achieve a utilization rate of 65%.
2、 Early application
Urea belongs to the acyl ammonium nitrogen fertilizer, which cannot be directly absorbed and utilized by crops after being applied to the soil. It needs to be converted into ammonium nitrogen under the action of urease in the soil to be absorbed by the root system; If applied too late, it not only hinders the utilization of fertilizer efficiency, but may also cause crop growth and late ripening.
3、 Foliar spraying
Urea is easily soluble in water, has strong diffusivity, is easily absorbed by leaves, and has little damage to leaves. It is suitable for topdressing outside roots, and can be sprayed on leaves in combination with crop Pest control. But when applying topdressing outside the roots, urea with a biuret content not exceeding 2% should be selected to prevent damage to the leaves. The concentration of topdressing outside the roots varies depending on the crop. The spraying time should be after 4pm, when the transpiration is small and the leaf stomata gradually open, which is conducive to the full absorption of urea aqueous solution by crops.
4、 Combined application with other fertilizers
Urea should be applied in combination with Manure, phosphorus potassium fertilizer and microelement fertilizer to maintain the balance of soil nutrients, maximize the nutrient utilization rate and play the role of fertilizer in increasing production.
