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Glyoxal (Glyoxal)

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Glyoxal

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ODIX
Oxal
GLYOXALE
GLYOXA
Biformyl
DIFORMYL
Ethanedial,Oxalaldehyde
Ethanedial
Diformal
Glyoxal
Biformal

+Expand -Stow

107-22-2

C2H2O2

58.036

2912190001

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Chinese

English

Nature Description

Colorless or light yellow ribbed crystals or liquids, crystals are easy to deliquesce. Melting point 15℃, boiling point ℃, relative density 1.14(20/4 ℃), refractive index 1.3826. The steam is green and has a purple flame when burning. Rapid polymerization when placed, exposed to water (violent reaction) or dissolved in aqueous solvent. It usually exists in various aggregate forms. When heated, the anhydrous polymer is converted into monomer again. The polymer is co-heated with P-propylene anisole, phenetole, camphor, methyl nonyl methyl ketone or benzaldehyde to obtain monomer solution. Aqueous solution contains single molecule glyoxal, which is weakly acidic and has active chemical properties. It can carry out addition or condensation reaction with ammonia, amide, aldehyde and carboxyl-containing compounds. Soluble in water, soluble in common organic solvents.

1.265

104oC

-14oC

MISCIBLE

Product Applications

It is used as pharmaceutical intermediate, fabric finishing agent, dye and dye intermediate; It is used as shrinkage inhibitor of adhesive and rayon, and also used in organic synthesis; It is used as insoluble binder of viscose fiber, polyvinyl alcohol, starch, etc. after finishing agent, as well as the raw materials of paint, dye and medicine; Glyoxal is prepared..

Production method

The main industrial production methods include ethylene glycol gas phase catalytic oxidation and acetaldehyde nitric acid oxidation. 1. Glyoxal phase catalytic oxidation ethylene glycol and air are catalytically oxidized at 250-300 ℃ in the presence of copper catalyst to generate glyoxal: the active component of the catalyst is copper oxide (including Cu03-8), the carrier is alumina or alumina, aloxite, and is prepared by dipping and roasting copper (II) nitrate. The service life is up to one year, and it is regenerated by burning method. After preheating and gasification, ethylene glycol is mixed with circulating gas into the catalytic reactor to control the amount of fresh air to prevent the deep oxidation of ethylene glycol, and nitrogen flow is used to bring halogen compounds as inhibitors for deep oxidation, the reaction is carried out at 275℃ and under the pressure of 0.74MPa. The reaction product is cooled with water, and the concentration obtained by absorption is the finished product. Ethylene glycol plus one-way conversion rate is 80-85. 2. Acetaldehyde nitric acid oxidation takes copper (II) nitrate as catalyst and uses nitric acid for liquid phase oxidation: under the condition of stirring and sufficient cooling, acetaldehyde and nitric acid are respectively mixed into about 50 solutions, copper (II) nitrate into 40 solution, sodium nitrite into 5 solution. Add a small amount of nitric acid solution and acetaldehyde solution to the reaction pot first, then put sodium nitrite solution into the reaction pot, heat it slightly until Brown red gas occurs, and naturally heat it to 30℃, at the beginning, a small amount of nitric acid solution and acetaldehyde solution were added dropwise at the same time, and the reaction temperature was controlled at 40-45 ℃. The escaping acetaldehyde gas was absorbed by water and then added to the reaction pot, Continue the reaction for 3 hours. The ingredients of acetaldehyde in the reaction are excessive (nitric acid: Acetic acid = 1:2 according to the molar ratio). After the reaction is finished, the acetaldehyde is recovered by heating to 98 °c. Then add activated carbon to decolorize, cool, filter and wash with water. Combine the filtrate with the washing solution, steam out the organic acid below 70℃(21.33kPa), repeatedly replenish water and then steam until the acidic cation exchange resin and weak basic anion exchange resin in the distillate remove impurities. Exchange fluid and elution hydraulic concentration to obtain qualified glyoxal concentration. The yield is about 32 based on acetaldehyde.

Security

Dangerous Goods Marking： Xn

Safety instructions： S36/37: Wear suitable protective clothing and gloves.

Hazardous material category code： R20: Harmful inhalation. R43: skin contact will produce allergic reactions. R68: the risk of possible irreversible effects R36/38: it can irritate eyes and skin.

Dangerous goods transportation number： UN1760

Storage conditions： 2-8oC