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Molecular formula : C4H4O2
MW : 84.07
CAS No. :674-82-8
nature : colorless stimulate the smell of flammable liquids. -6.5 ° C melting point, boiling point, 127.4 ° C and relative density of 1.0897 (20/20 ° C), the refractive index of 1.4379, heat capacity 0.1990kJ / (kg ° C), a flash point of 33.9 ° C Soluble in common organic solvents, do not dissolve in water. The chemical nature of lively, easily placing polymerization, acid, alkali, amines, peroxide can play a catalytic role in accelerating polymerization explosion. With water can be decomposed into carbon dioxide.
preparation methods : acid industrial Preparation ketene, use acetone, acetic anhydride, acetate as raw materials for thermal decomposition. Acetone thermal decomposition method can be used for small-scale production, this method because Vice producing methane, the gas diketene lower purity, and to remove the residual acetone more difficult. Acetic acid phosphatase in the presence of ethyl 3, 750-780 ° C in the ethylene cracker in one and then to generate 8-10 ° Cpolymerization diketene.
purposes : ketene the ability to respond very strong, and can generate a variety of products, fine chemicals dyes, pharmaceuticals, agricultural chemicals, food and feed additives, raw materials and other additives. 2-enone and triethylamine reaction acetoacetyl diethylamide organic phosphorus pesticide intermediates amine; With a methylamine reaction acetoacetyl methylamine is monocrotophos intermediates. Ketene produced by the reaction of ammonia and acetyl acetamide, dye intermediates for the synthesis of 1-(4-chlorophenyl) - 3-methyl-5-pyrazolone, 1-(4-sulfophenyl phenyl) - 3-methyl-5-pyrazolone; Ketene and B Alcohol produced by the reaction of ethyl acetoacetate, dye intermediates for the synthesis of 1-Phenyl-3 - Methyl-5-pyrazolone, 1-(2,5-Dichloro-4-sulfo-phenyl) - 3-methyl-5-pyrazolone so. These intermediates can be obtained Everlasting yellow dye G, acidic media BN purplish red, orange RL neutral, neutral retarding brown, dark brown BRL neutral, acidic Yellow G, G Yellow weak acid, acid Yellow 2G, Reactive Dyes K-6G, activity Yellow M - 5G, activity Yellow X-6G, neutral pink BL so. 1-Phenyl-3 - Methyl-5-pyrazolone derivatives for more Antipyretics antipyryl forest, aminophyrine, analgin and other production. TS can be used to the synthesis of amino acids. Ketene and neighbors nitroaniline, diethanolamine as raw materials can be obtained Olaquindox feed additives (fast infertility Ling). Ketene for a variety of synthetic heterocyclic compounds, such as synthetic pyrrole derivatives, isoxazole derivatives, pyrazolone derivatives, pyrimidine derivatives, thiazole derivatives, quinoline compounds, coumarins, furan derivatives; Ketene can also react with a series of compounds that generate pyron, pyridone, 1,4-dioxane, Oxazine and other flavonoids.
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