Abstract
The kinetics of the dehydration of methylene glycol were measured under conditions relevant in industrial formaldehyde absorbers (293 K⩽ T⩽333 K; 6.0⩽pH⩽7.8). The rapid reaction between formaldehyde and SO 3 2− to hydroxymethane sulphonate (HMS −) was used as a formaldehyde scavenger: CH 2( OH) 2 → k d CH 2 O+ H 2 O, CH 2 O+ SO 2− 3 → fast CH 2( O −) SO − 3, CH 2( O −) SO − 3+ H + → fast CH 2( OH) SO − 3. Under the experimental conditions the rate determining step in the formation of HMS − appeared to be the dehydration of methylene glycol. The observed reaction rate constant for the dehydration of methylene glycol could be correlated as k d =4.96×10 7× e −6705/T s −1 . The dehydration rate is shown to be independent of the concentrations of both sulphite and hydroxide ions.
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