Patent ID: 7683220

Claim:
A process for production of acrolein, which comprises dehydrating glycerin in the presence of a catalyst containing a metal phosphate, wherein the metal phosphate is one, or two or more, metal phosphates selected from the group consisting of aluminum salts, zirconium salts, manganese salts, alkali metal salts (wherein the alkali metal is sodium, potassium, or cesium, and a ratio between a mole number (M) of the alkali metal and a mole number (P) of phosphoric acid (M/P ratio) in the metal phosphate is 2.0 or lower), alkali earth metal salts (wherein a ratio between a mole number (M) of the alkali earth metal and a mole number (P) of phosphoric acid (M/P ratio) in the metal phosphate is 1.0 or lower), yttrium salts, titanium salts, hafnium salts, vanadium salts, niobium salts, chromium salts, cobalt salts, nickel salts, silver salts, cadmium salts, mercury salts, boron salts, tin salts, lead salts, bismuth salts, lanthanum salts, cerium salts, and samarium salts.