Specialty Resins – Glyoxal Deacidication And Glyoxal Purification
Glyoxal is produced by the nitric acid oxidation of aqueous acetaldehyde. In crude state, it contains significant amounts of acids such as acetic, formic, glyoxylic, and unreacted nitric acid. After processing to remove the bulk of acetic and formic acids, crude glyoxal still contains some acidity, calculated as acetic acid. These acids must be removed in order to produce a saleable product. There are various methods of purification of Glyoxal like evaporation but in commercial practice, purification seems to be conducted exclusively by fixed-bed ion exchange.
Some uses of TULSION® resins which are offered for glyoxal processing are:
- De-acidification and removal of anionic impurities - Macroporous weak base anion resin
- Removal of color imparting cationic impurities- Strong Acid Cation resin