Formaldehyde

Formaldehyde, also known as formic aldehyde, is an organic compound, the chemical formula is HCHO or CH2O, and the molecular weight is 30.03. It is colorless and irritating gas, which can stimulate human eyes, nose, etc. The relative density of gas is 1.067 (air=1), and the density of liquid is 0.815g/cm3 (- 20 ℃). Melting point - 92 ℃, boiling point - 19.5 ℃. Soluble in water and ethanol. The highest concentration of aqueous solution can reach 55%, generally 35% - 40%, and usually 37%. It is called formaldehyde water, commonly known as formalin

Sulfuric acid

Sulfuric acid is the most active binary inorganic strong acid, which can react with most metals. High concentration sulfuric acid has strong water absorption, and can be used as a dehydrating agent to carbonize such carbohydrate containing substances as wood, paper, cotton and linen fabrics and biological flesh. When mixed with water, a large amount of heat will also be released. It is highly corrosive and oxidizing, so it should be used with caution. It is an important industrial raw material, which can be used in the manufacture of fertilizers, drugs, explosives, pigments, detergents, batteries, etc. It is also widely used in the purification of petroleum, metal smelting, dyes and other industries. It is commonly used as a chemical reagent, and can be used as a dehydrating agent and a sulfonating agent in organic synthesis.

N-butyl alcohol

N-butanol, also known as 1-butanol, is an organic compound. It is a colorless transparent liquid, slightly soluble in water, and soluble in ethanol, ether and other organic solvents. It is mainly used to prepare esters, plastic plasticizers, medicine, paint, and can also be used as a solvent.

Trichloromethane

Trichloromethane, an organic compound, is a colorless transparent liquid with special smell, sweet taste, high refraction, nonflammable, heavy and volatile. It is sensitive to light. It reacts with oxygen in the air when exposed to light and gradually decomposes to produce highly toxic phosgene (carbonyl chloride) and hydrogen chloride. 0.6%~1% ethanol can be added as stabilizer.

Coal tar

Coal tar is one of the products of raw gas generated from coal pyrolysis in coking industry. Its output accounts for about 3%~4% of the charged coal. Its composition is extremely complex. In most cases, the coal tar industry is specialized in separation, purification and utilization. Under normal temperature and pressure, the product is black, and each fraction can be further processed to separate a variety of products, such as camphor pills, asphalt, plastics, pesticides, etc.

Solvent oil

Solvent oil is one of the five major categories of petroleum products. Solvent oil is widely used. The largest amount of solvent oil is paint solvent oil (commonly known as paint solvent oil), followed by edible oil, printing ink, leather, pesticides, pesticides, rubber, cosmetics, spices, medicine, electronic components and other solvent oils. At present, there are about 400-500 kinds of solvents on the market, of which solvent oils (hydrocarbon solvents, benzene compounds) account for about half.