Chemical Synthesis

Release time：2025-09-24 10:56:09

From petrochemical raw materials to high value-added fine chemicals, from traditional synthesis methods to green and sustainable processes, the application of chemicals continues to drive innovation and progress in chemical synthesis technology. The core role of basic petrochemical raw materials in chemical synthesis
The basic raw materials of petrochemicals constitute the backbone network of chemical synthesis, among which the olefin and aromatic hydrocarbon families are particularly important. Alkene compounds such as propylene, butene, and butadiene, as well as aromatic compounds such as benzene, toluene, and xylene, can be derived into thousands of chemical products through a series of chemical reactions, forming a vast system of modern chemical industry. These basic raw materials are like those in the chemical industry; Lego bricks; By using different combinations and conversion methods, specialized chemicals that meet the needs of various fields can be constructed.  
  Diversified applications of carbon three carbon four olefins: propylene, as the most important carbon three olefin, has applications far beyond the synthesis of polypropylene. Through ammonia oxidation reaction, propylene can be converted into acrylonitrile, which is a key monomer for the production of important materials such as acrylic fiber, nitrile rubber, ABS resin, etc.  
  The isopropylbenzene generated by the alkylation reaction of propylene and benzene can be used to produce phenol and acetone through the isopropylbenzene process, which are the basic raw materials for resins, adhesives, and solvents, respectively. The value of C4 olefins (butene, isobutene, butadiene) should not be underestimated. Butadiene can be converted into eight carbon straight chain olefins through linear polymerization reaction, which can then be aldehyded and hydrogenated to obtain nonanol. This substance has a wide range of applications in the synthesis of fragrances, surfactants, lubricant additives, and other fields. It is worth mentioning that when cobalt complexes are used as catalysts, the dimerization, trimerization, and tetramer of butadiene can all become high-quality raw materials for the synthesis of higher alcohols and macrocyclic musk, providing important support for the spice industry.  
  The key conversion pathway of the aromatic hydrocarbon family: Benzene, as the most basic member of the aromatic hydrocarbon family, is used globally for the production of styrene, which is a monomer used in the manufacture of polystyrene plastics and other styrene copolymers
  Another 15-18% of benzene is used for the production of cyclohexane (nylon precursor) and phenol, while benzene is also the starting point for the synthesis of important derivatives such as aniline, alkylbenzene, and maleic anhydride. Although toluene is commonly used as a solvent in direct applications such as paints, inks, resins, etc., its value as a synthetic intermediate is more prominent. Through a series of reactions, toluene can be converted into products such as benzoic acid, benzyl chloride, meta cresol, and toluene diisocyanate (TDI), which further become key raw materials for pesticides, pharmaceuticals, and polyurethane materials. The three isomers of xylene (ortho, meta, and para) also have their own characteristics, especially the terephthalic acid produced by the oxidation of xylene, which is an irreplaceable raw material for the production of polyester fibers and plastics (such as PET).  
Table: Main Petrochemical Basic Raw Materials and Their Derivative Products

Reaction mechanism and process optimization: The conversion of these basic raw materials involves multiple catalytic mechanisms and reaction types. Taking the separation of isobutene as an example, due to its boiling point difference of only 0.6 ℃ with n-butene, chemical separation methods such as sulfuric acid extraction, adsorption separation, resin hydration dehydration are commonly used in industry, especially the methyl tert butyl ether (MTBE) cracking method, which is widely used. The purity requirements for isobutene also vary depending on the final product: producing MTBE, tert butanol, etc. requires a purity of over 50%; Preparation of methyl methacrylate (organic glass raw material) requires a purity of over 90%; The synthesis of butyl rubber requires over 99% high-purity isobutene. The precise control of these reaction conditions and process routes demonstrates the scientific and technological essence of chemical product synthesis.