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6174360 
Journal Article 
FORMATION OF 2-ETHYL ACROLEIN BY GAS-PHASE ALDOL CONDENSATION 
Albanesi, G; Moggi, P 
1988 
Yes 
Applied Catalysis
ISSN: 0166-9834 
37 
1-2 
315-322 
WOS:A1988M303100023 
The gas phase aldol condensation between n-butyraldehyde and formaldehyde to give 2-ethyl acrolein, CH2C(C2H5)CHO, over a silica supported tungsten oxide catalyst, by feeding formaldehyde as hemiformal or trioxane, over a wide range of operating conditions has been studied. A maximum selectivity of about 95% to 2-ethyl acrolein based on n-butyraldehyde, at 275–300°C, by using a feeding molar ratio of formaldehyde (supplied as hemiformal) to n-butyraldehyde of about 2 to 1, with 50% n-butyraldehyde conversion, was found. The reaction studied could provide a viable alternative to the usual liquid phase process for the synthesis of 2-ethyl acrolein.