English title : Glyoxal; Ethanedial; glyoxal; 1,2-ethanedione; aerotex glyoxal 40; biformal; biformyl; diformal; diformyl; ethandial; ethanedione; glyoxal aldehyde; glyoxylaldehyde

nature Description : Prism colorless or pale yellow or liquid-crystalline and crystalline easy deliquescence. The temperature 15 ° C, the boiling point of 50.5 ° C and relative density of 1.14 (20 / 4 ° C), the refractive index of 1.3826. Steam green, purple with burning flame. Items; WATER (severe reaction) or water-soluble solvent rapid polymerization. Usually various polymerization to form. Heating anhydrous polymer has changed into monomers. Will acrylamide polymer and right-fennel ether; Phenetole; Safrole; A methyl nonyl ketone, or a total of benzaldehyde heat, available monomer solution. Single molecule containing aqueous solution Glyoxal, was weak acid, the chemical nature of lively, with ammonia; Amide; Formaldehyde; The carboxyl-containing compounds Addition or condensation reaction. Dissolved in water; Soluble in common organic solvents.

production methods : the main industrial production methods glycol gas and catalytic oxidation of nitric acid oxidation of acetaldehyde. 1. Glyoxal phase catalytic oxidation of ethylene glycol and air in the presence of copper catalysts in the 250-300 ° C for catalytic oxidation, glyoxal Generation : Catalyst divided into copper oxide (including Cu03-8%), the vector of alumina corundum, or aluminum sand, copper nitrate Roasting impregnation obtained.使用寿命达一年，并顺用灼烧法再生�?After preheating glycol gasification cycle gas mixed with access to catalytic reactor, control the incorporation of fresh air, preventing oxidation of ethylene glycol depth, and nitrogen flow into the use of halogen compounds, as the depth of oxidation inhibitor, in response to 275 ° C, 0.74MPa under pressure, the reaction product of water Chilled, absorption concentration shall be finished.乙二醇加单程转化率为80-85%�?2. Nitrate acetaldehyde oxidation of copper nitrate catalyst, using liquid phase oxidation of nitric acid : stirring; Adequate cooling conditions, respectively, to acetaldehyde and nitrate dubbed the 50% of the solution, nitrate copper dubbed the 40% solution, sodium nitrite dubbed the 5% solution. First reaction pot adding a small amount of nitric acid solution and acetaldehyde, to rejoin the sodium nitrite solution, a little hot red to brown gases occur naturally warming to 30 ° C, while starting a small 71/92 solution of nitric acid solution and acetaldehyde, about 4h step, the reaction temperature is controlled at 40-45 ° C, the escaping gases acetaldehyde water absorption after joining reaction pot, and continue to respond 3h. The reaction of acetaldehyde ingredients of excessive (molar ratio, nitrate : acetic acid = 1:2), after completion of the reaction, heating recovery acetaldehyde to 98 ° C Then increasing active carbon used cooling; Filtration; Washed. Filtrate and lotion will merge in 70 ° C (21.33kPa) following steamed organic acids, repeatedly pay steamed until distillate liquid acid cation exchange resin and weak basic anion exchange resin to remove impurities. Exchange hydraulic fluid and renounce enrichment, in the concentration of glyoxal qualified. To include acetaldehyde, the yield of approximately 32%.

purposes : glyoxal mainly used in the textile industry, so fiber can increase cotton agent; Nylon fiber spinning reduction and crease-resistant, and is Durable Press Finishing agent. In Japan for the purpose of glyoxal total extinction of 80%. Acetaldehyde is gelatin; Gelatin; Cheese; PVA and starch insoluble binder, glyoxal also for the leather industry and the production of waterproof matches. Glyoxal organic synthesis of raw materials. By acetaldehyde and urea; Formaldehyde sodium carbonate in the presence of condensation heating 2D-resin, used for Finishing agent; Glyoxal and formaldehyde; Ammonium sulfate reaction, synthesis imidazole ring, then synthetic antifungal Clotrimazole imidazole; Miconazole; Glyoxal and o-phenylenediamine cyclization be benzo pyrazine : it is the anti-tuberculosis drug pyrazinamide intermediates.由乙二醛生产的羟基苯基乙酸已在日本工业生产，用作抗菌素和维生素A系列产品中间体�?乙二醛还用于黄连素盐酸盐和磺胺类药磺胺甲氧吡嗪的合成。还用于除虫剂；除臭剂；尸体防腐剂；砂型固化剂k_/font>

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