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Molecular formula : C10H8
MW : 128.17
CAS No. : 91-11-338-9550-20-3
nature : a colorless luster to the monoclinic crystal. Combustible. Zhi smells of camphor ball at room temperature are also quite volatile and can be sublimated. 80.29 ° C melting point, boiling point of 218 ° C and relative density of 1.145 (20 / 4 ° C), 0.9625 (100 / 4 ° C), a lighted 86 ° C spontaneous ° C526.11 points, 1.5898 refractive index, the flash point ( open Cup) 7.889 ° C 1g the materials can be dissolved and methanol or ethanol, sufficient current benzene or toluene, carbon tetrachloride or chloroform 2ml, Sh carbon disulfide. Do not dissolve in water. Also steam together and volatile. Explosions and air mixture formation; Explosion limits of 0.9% -5.9% (volume).
Preparation : 1. Separation from coal tar, naphthalene in coal tar heat about 8% -12%, coal tar distillation, cut kerosene, phenol removal, de - quinoline, refined distillation in naphthalene. Naphthalene 10t consumption per ton of coal tar. 2. By petroleum hydrocarbons obtained : Catalytic Heavy restructuring oil, FCC light cycle oil, ethylene cracker, vice-tar. Its composition is as follows : Item catalytic reforming oil FCC light cycle oil-product of coal tar steam cracker total aromatics (m),% 90-95 45-65 70-95 95-100 aromatic composition (m), alkylbenzenes% 20 25 20 5 indene and dihydro tetrahydronaphtho 15 25 10 5 alkyl indenyl 2 7 18 3 alkylnaphthalenes category 55 35 45 75 biphenyl and alkyl category 6 6 5 10 tricyclic compounds 2 2 2 2 Total,% aromatics by 100100100100 dealkylatase catalytic and thermal relief can produce alkyl naphthalene.
uses : industrial naphthalene is the most important part of viscous hydrocarbons, mainly for the production of phthalic anhydride, various naphthol, naphthylamine, is a production of synthetic resins, plasticizers, dyes intermediates, surfactants, synthetic fiber, paint, pesticides, medicines, spices, rubber Additives and pesticides raw materials. Naphthalene use allocation, vary across countries. Anhydride used in the production of roughly 70% for the dye intermediates and rubber additives, about 15% of pesticides accounts for some 6%, tanning agents, or about 4%. The United States used to produce a greater percentage of pesticides, mainly for the production of carbaryl. As raw materials to naphthalene, after sulfonation, nitrification, reduction, amination, hydrolysis unit operation can be obtained various intermediates. Refined Naphthalene also broaden the application of new products "super plastic material" that naphthalene sulfonate formaldehyde condensate and can be used as cement additives, concrete to increase the plastic deformation without reducing its strength. The next few years will demand 5-10% growth rate.
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