Structure and expression of benzene (1) the structure of modern physical methods proved benzene: Benzene six carbon atoms and six hydrogen atoms are in the same plane of propylene glycol monomethyl ether manufacturers, so it is a flat molecule, composed of six carbon atoms a regular hexagon, the carbon-carbon bond length is equal about 140 pm, between single and double bonds between. Hydrocarbon bond length of 108pm, all the bond angles are 120 °. Sources of coal and oil are the raw material for preparing simple aromatic hydrocarbons such as benzene, toluene and the like. These simple aromatic hydrocarbons is the basic raw material for preparing other high-aromatic compounds. When coal is heated in the absence of oxygen to 1000 ℃, coal tar molecules produced by thermal fractionation. From coal tar, benzene, toluene, xylene, naphthalene and other aromatic compounds can be produced. And coal is different from a lot of small amounts of alkanes and aromatic compounds containing oil. Petroleum fraction containing mainly naphthenic and paraffinic hydrocarbons, the aromatic hydrocarbons are the primary method for the conversion is reforming and aromatization. Aromatization refers alicyclic compound-containing six-membered ring in the presence of a platinum, palladium, nickel and the like catalyst, heating dehydrogenation, aromatic compounds generated in the process. Reforming include chain hydrocarbon cracking, isomerization, cyclization, ring expansion, hydrogen transfer, olefin hydrogen absorption and other processes. , Conventional reforming catalysts are generally carried out in the catalyst platinum, copper and the like. Oil industry is an important chemical reaction called hydroforming (or platinum reforming), is in the presence of hydrogen sales glycol methyl ether, platinum as a catalyst to rearrange the molecular structure of the supply of propylene glycol monomethyl ether, such as Pt, SiO2 / Al2O3,500 ℃, reaction was carried out at 1 ~ 4 MPa H2 and the reaction conditions exist. Hydroforming reaction process is very complex, because the reaction system is a mixture of propylene glycol methyl ether Tangshan, sales glycol methyl ether, Xiang dry chemical (certified merchants) from Jinan Cheung stem Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) is specialized in the "glycol" enterprise, the company of "honesty, hard service" concept, to provide you with the most quality products and services. Welcome to inquire! Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_43298945.html), for more information about the company.