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Methacrylic acid is colorless crystal or transparent liquid with pungent odor. Soluble in hot water, soluble in most organic solvents such as ethanol and ether. Easily polymerized into water-soluble polymers. Combustible, there is a danger of burning in case of high heat and open flame, and it can produce toxic gas when heated.
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Helium is a rare gas. Its English name is Helium, and its element symbol is He. It is a colorless and odorless inert gas. Its chemical properties are not vivid. Under normal conditions, it is difficult to react with other substances.
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insoluble in benzene, chloroform, carbon tetrachloride, carbon disulfide, petroleum ether and oils, it's miles the skeleton factor of triglyceride molecules.
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Biphenyl, whose molecular formula is C12H10, is an important organic raw material and is widely used in the fields of medicine, pesticides, dyes, and liquid crystal materials.
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Dissolving function: soluble in water and some solvents, such as ethanol/water, propanol/water in appropriate proportions. The aqueous solution has surface activity. High transparency and stable function. Different standard products have different gel temperatures and solubility changes with viscosity. The lower the viscosity, the greater the solubility. Different standards of HPMC have different functions. The dissolution of HPMC in water is not affected by pH.
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For diesel vehicles such as heavy trucks and passenger cars to meet the National IV emission standards, a suitable SCR system must be selected for exhaust gas treatment, and this system must use urea solution to treat nitrogen oxides in the exhaust gas. Therefore, urea solution for vehicles has become an essential product for heavy-duty trucks and passenger cars to meet the National IV emission standards.
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Melting point -70°C boiling point: 135.1°C solubility can be miscible with water and most organic solvents such as ethanol
Density (D4) 0.925-0.935
The relative density (water=1) is 0.94; the relative density (air=1) 3.10 is stable
Danger marks 7 (flammable liquid) and 14 (including drugs) are mainly used as solvents, as well as leather colorants, emulsifiers, stabilizers, paint thinners, paint removers, etc.
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Appearance: Light yellow to white granular crystals (semi-circular) white to light yellow loose crystals, heating is made black. Microfincture.
Content: ≥ 85%
Melting point: 98-102 ° C
Dry loss: ≤0.2%
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Light yellow to white granular crystals (semi-circular) white to light yellow loose crystals, heating is made black.
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Oxygen is a simple substance composed of oxygen. The chemical formula O2 has more vivid chemical properties, and most of the elements can react with oxygen.
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Oxygen is a colorless and odorless gas, and the most common elementary form of oxygen. Melting point is -218.4°C, boiling point is -183°C. It is not easily soluble in water, and about 30mL of oxygen can be dissolved in 1L of water. Oxygen in the air accounts for about 21%. Liquid oxygen is sky blue. Solid oxygen is blue crystals.
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It uses oxygen with a purity of 93.5%-99.2% and combustible gas (such as acetylene) to produce a flame of extremely high temperature, thereby melting the metal. The metallurgical process cannot do without oxygen. In order to strengthen the production of nitric acid and sulfuric acid, oxygen is also required. Instead of using air, a mixture of oxygen and water vapor is blown into the coal gasifier to obtain coal gas with high calorific value.
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Common tetra-group lead, ferrocene, MMT (methylcyclopentadiene trikarbonyl manganese) or CMT is common, because metal deposits can occur in the inside of the launching machine, resulting in a cylinder wear, spark plug ignition Poor problems such as poisoning, oxygen sensors and ternary catalysts, have been prohibited or constrained. The addition of tetra-element and ferrocene added is known as national standards, and the manganese-based anti-explosive agent is strictly constrained (the detection limit is less than 0.018 g / L).
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In fact, any kind of antioxidant can not fully meet these conditions. Therefore, in actual application, it is often based on the variety, use and processing method of engineering plastics, using the strengths of various additives and cooperating to produce synergistic effects.
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HCFC-141b (monofluorodichloroethane) is a high-purity liquid widely used in cleaning and solvent fields.
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Amino -alumanate pesticide is a synthetic pesticide developed after organic phosphate. Its general formula is RO (C) NRR. Amino -aminate pesticides generally have no special odor, stable in acidic environments, alkali decomposition, and most varieties are lower toxicate than organic phosphate
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Ammonia, also known as Amonia water, can be written as NH3(aq), which is an aqueous solution of ammonia, colorless, transparent and has a pungent odor.
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Appearance and properties: white or almost white fibrous or granular powder
Density: 1.39 g/cm3
Solubility: almost insoluble in absolute ethanol, ether, acetone; swelling in cold water into a clear or slightly dirty colloidal solution
Stability: The solid is flammable and incompatible with strong oxidants.
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Hypromellose (Hypromellose), also called hypromellose, is one of the non-ionic cellulose mixed ethers.
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Solubility: Insoluble in water, acid and alkali, but soluble in organic solvents such as alcohol, ether and benzene.The preparation methods of biphenyl include the chemical composition method of making biphenyl through benzene pyrolysis and the separate extraction method of making biphenyl through various coal tar fractions. The mass fraction of biphenyl in coal tar is 0.20%-0.40%, and coal tar extraction method and chemical composition method coexist.
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Relate News
In 2011, global methanol demand reached 54 million tons. In the next few years, driven by the rapid development of emerging applications, global methanol demand will soar to 85 million tons in 2015.
According to the data, the domestic xylene market price trend has fallen sharply.The Pengzhou Petrochemical Plant, Urumqi Petrochemical Plant, and Fuhai Chuang Aromatics Plant each run one line. Hengli Petrochemical’s PX plant is overhauled, and other plants are temporarily The operation is stable.
Diatom mud is a natural and environmentally friendly interior wall decoration material, which is used to replace wallpaper and latex paint, and plays the role of interior wall decoration and indoor air purification. Powder packaging, not liquid barrels.
The main raw material of diatom mud is the diatom mineral diatomite formed after hundreds of millions of years. Diatom is a kind of algae living in oceans and lakes. Diatom mud is made of natural substances deposited by diatoms, aquatic plankton living in millions of years ago.
When the PH cost of the ammonia water is small, the supersaturation of the reaction is small, so the obtained magnesium hydroxide has a large particle length and a quick sedimentation speed; whilst the PH price of the ammonia water is tremendously large, the response supersaturation is enormously large, and the sedimentation time of the magnesium hydroxide lengthy.
Hydrogen peroxide, also known as peroxide, is a low-toxic substance, but if used improperly, it can still cause harm to the human body. Next, I will introduce you to the use of hydrogen peroxide and its hazards.
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harmless. Nano-titanium dioxide is a stable metal compound with good stability.
