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Crystalline powder, nonhygroscopic. More sol in hot water than in cold water. Commercially available in anhydr form as crystalline dihydrate, or as a.

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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:

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2 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

3 C2H2O2C2H2O2

4 amu

5 1.265 g/cm g/cm 3 (20° C)

6 * 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.

7 * 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.

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9 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.

10 * * * ue&_pageLabel=PP_ARTICLEMAIN&node_id=84 1&content_id=CNBP_029696&use_sec=true&sec_u rl_var=region1&__uuid=49422ad5-e13e-41f7-a225- adf9e12dba1f ue&_pageLabel=PP_ARTICLEMAIN&node_id=84 1&content_id=CNBP_029696&use_sec=true&sec_u rl_var=region1&__uuid=49422ad5-e13e-41f7-a225- adf9e12dba1f


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