Process for the production of acrolein
AssigneeDegussa AG
InventorsArmin Neher, Thomas Haas, Dietrich Arntz, Herbert Klenk, Walter Girke
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Abstract
A process for the production of acrolein by dehydration of glycerol in the liquid phase or in the gaseous phase, in each case on acidic solid catalysts, is described. Compared with previously known processes, the space-time yield and catalyst service life may be surprisingly increased with higher selectivity by treating a glycerol-water mixture with a glycerol content of 10 to 40 wt. % at 180.degree. to 340.degree. C. (liquid phase) or at 250.degree. to 340.degree. C. (gaseous phase) on a solid catalyst with an H.sub.o value (Hammett acidity function) of less than +2, preferably less than -3.
Claims20
A process for the production of acrolein or aqueous acrolein solution by dehydration of glycerol, said process comprising reacting a glycerol-water mixture with a glycerol content of 10 to 40 wt. % in either liquid phase at 180.degree. to 340.degree. C. or gaseous phase at 250.degree. to 340.degree. C. on an acidic solid catalyst and optionally separating acrolein or aqueous acrolein solution, wherein the H.sub.o value (Hammett acidity function) of said catalyst is less than +2.
A process for the production of acrolein or aqueous acrolein solution by dehydration of glycerol, said process comprising reacting a glycerol-water mixture with a glycerol content of 10 to 40 wt. % in either
- (a) liquid phase at 180.degree. to 340.degree. C. on an acidic solid catalyst, wherein the H.sub.o value (Hammett acidity function) of said catalyst is less than +2, until a glycerol conversion of 8 to 25% is achieved, the acrolein formed is separated from the reaction mixture alone or with a proportion of the water by stripping and the acrolein-free reaction mixture is returned to the dehydration stage, or
- (b) gaseous phase at 250.degree. to 340.degree. C. on an acidic solid catalyst, wherein the H.sub.o value (Hammett acidity function) of said catalyst is less than +2 to -8.2;
- and optionally separating acrolein or aqueous acrolein from the reaction mixture.
Dependencies are inferred from the claim text.