Intermediates refer to semi-finished products, which are intermediate products for the production of some products. For example, if a product is to be produced, it can be produced from intermediates to save costs.
Intermediates are formed from cyclic compounds such as benzene, naphthalene and anthracene through sulfonation, alkali melting, nitration and reduction. For example, benzene is nitrated into nitrobenzene and then reduced to aniline. Aniline can be chemically processed into dyes, drugs, vulcanization accelerators, etc. Nitrobenzene and aniline are intermediates.
It is also made of acyclic compounds such as methane, acetylene, propylene, butane and butene through dehydrogenation, polymerization, halogenation and hydrolysis. For example, butane or butene is dehydrogenated to butadiene, and butadiene can be chemically processed into synthetic rubber, synthetic fiber, etc. Butadiene is an intermediate.
Initially, it refers to the intermediate products produced in the process of synthesizing spices, dyes, resins, drugs, plasticizers, rubber accelerators and other chemical products with coal tar or petroleum products as raw materials. Now it generally refers to various intermediate products obtained in the process of organic synthesis.