Presentation on theme: "Crystalline powder, nonhygroscopic. More sol in hot water than in cold water. Commercially available in anhydr form as crystalline dihydrate, or as a."— Presentation transcript:
Crystalline powder, nonhygroscopic. More sol in hot water than in cold water. Commercially available in anhydr form as crystalline dihydrate, or as a 40% aq soln which may contain polymerization inhibitors
1.265 g/cm 3 1.4 g/cm 3 (20° C)
* Coated paper and in the textile finishes use large amounts of glyoxal for wrinkle-resistant chemical treatments. It is used as a solubilizer and cross-linking agent in polymer chemistry.
* Varies from low to harmful in animal experiments performed with different species, depending on the active ingredient concentration of the tested product. * Has 40% toxicity a moderate toxicity by the oral route, a low toxicity by the dermal route and a moderate toxicity by inhalation. * Causes slight to definite skin irritations depending on the exposure duration.
N. Lubawin In 1875, Lubawin oxidized acetaldehyde with HNO 3 or H 2 SeO 3. The HNO 3 method is still used commercially, along with metal-catalyzed gas-phase oxidation of ethylene glycol. At low temperatures, glyoxal forms yellow crystals; it melts at 15 °C and boils at 51 °C. Its low flash point (–4 °C) makes its green vapor explosive in air.