Cyclic hydrocarbon

Cyclic hydrocarbons are also known as closed-chain hydrocarbons, a general term for hydrocarbons having a cyclic structure. It means that the carbon atoms in the molecule are connected to form a cyclic hydrocarbon. According to structure and properties, it can be classified into alicyclic hydrocarbons and aromatic hydrocarbons. However, a general cyclic hydrocarbon refers to an alicyclic hydrocarbon. According to the number of rings, it is divided into cyclic hydrocarbons such as monocyclic, bicyclic and tricyclic. The aromatic hydrocarbon means a closed chain hydrocarbon having a basic structure of a benzene ring or having an aromatic compound property. It can be divided into monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons and non-benzene aromatic hydrocarbons. The monocyclic aromatic hydrocarbon molecule contains only one benzene ring, such as toluene, xylene, ethylbenzene, styrene, phenylacetylene and the like. The polycyclic aromatic hydrocarbon molecule contains two or more benzene rings. According to the way in which the benzene rings are linked to each other, they can be further divided into: 1 polyphenylene aliphatic hydrocarbons such as diphenylmethane, triphenylmethane, stilbene, tetrastyrene, and the like. 2 biphenyl and biphenyl, such as biphenyl, terphenyl, biphenyl and so on. 3 fused ring aromatic hydrocarbons, such as naphthalene, anthracene, phenanthrene, anthracene, anthracene, anthracene, anthracene Non-benzene aromatic hydrocarbons do not contain a benzene ring, but have a certain degree of aromatic hydrocarbons such as hydrazine, olefin, and the like. It is easy to initiate a substitution reaction, it is not easy to initiate an addition reaction, and the ring is not easily broken. It is mainly obtained from the fraction of coal tar and the aromatization product of petroleum. Can be used as a solvent and chemical raw materials. Aliphatic cyclic hydrocarbons are referred to as alicyclic hydrocarbons and are closed chain hydrocarbons having the properties of aliphatic compounds. It can be divided into saturated cycloalkanes and unsaturated cyclic olefins. Naphthenes are found in petroleum and are components of petroleum products. The cycloalkane contained in the liquid fuel and solvent has a small molecular weight and a large molecular weight contained in the lubricant. They are also used as raw materials and solvents in chemical production. Cycloolefins are by-products of petrochemicals and coal-to-coking chemicals and are used as chemical raw materials. The alicyclic hydrocarbons contained in plants are called hydrazine (partial hydrazine is an open chain hydrocarbon). A mixture of hydrazine commonly used in the industry is turpentine. Most of the compounds in this class are flammable liquids, and their vapors can reach explosive concentrations in normal temperature air. Alicyclic hydrocarbons are toxicologically similar to the corresponding open chain hydrocarbons. In general, alicyclic hydrocarbons are anesthetics and central nervous system inhibitors. The inhalation anesthetic effect of naphthenes is stronger than the corresponding open chain hydrocarbons. The anesthetic action of the cyclic olefin increases as the number of double bonds in the molecular structure increases. The acute toxicity of alicyclic hydrocarbons is low, almost all of them are excreted from the body, and there is generally no risk of chronic poisoning. Liquid alicyclic hydrocarbons are irritating to the skin. High concentrations of vapor can cause mucosal irritation. Cyclic olefins are more irritating than naphthenes. Direct inhalation of liquid alicyclic hydrocarbons can cause pneumonia, pulmonary edema and pulmonary hemorrhage. No alicyclic hydrocarbons were found to have a detrimental effect on hematopoietic tissue, whether inhaled, orally or transdermally.