Removal of formaldehyde from aqueous solutions

Kolah, Aspi K. ; Sharma, Man Mohan (1995) Removal of formaldehyde from aqueous solutions Separations Technology, 5 (1). pp. 13-22. ISSN 0956-9618

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The removal of formaldehyde from aqueous solutions of 2-butyne-1,4-diol (BD), which are prepared from ethynylation of acetylene with aqueous formaldehyde, was successfully accomplished by a number of approaches: reaction with sodium bisulfite and removal of the resultant ionic product with an anion exchange resin in a fixed bed system or using an anion exchange resin bed in bisulfite form; reactive distillation with methanol and ethylene glycol in the presence of cation exchange resin as catalyst to give the corresponding acetals; internal acetalization with BD in the presence of cation exchange resin as catalyst; Cannizzaro's reaction with sodium hydroxide; and aldol type condensation in the presence of sodium hydroxide. Residual concentrations of formaldehyde as low as 20 ppm could be achieved through more than one of the methods mentioned above.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Acetalization; Ion Exchange; Cannizzaro's Reaction; Aldol Type Condensation; Reactive Distillation; Cation Exchange Resin; Anion Exchange Resin; Formaldehyde; 2-butyne-1, 4-diol; Methanol; Ethylene Glycol; Sodium Hydroxide; Sodium Bisulfite
ID Code:46197
Deposited On:02 Jul 2011 10:54
Last Modified:02 Jul 2011 10:54

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