Process for producing pyridine bases
AssigneeKoei Chemical Company, Limited
InventorsYoshizo Minato, Shikibu Nishikawa
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Abstract
Pyridine bases are produced in higher yield from at least one of aliphatic carbonyl compounds and ammonia by reaction at 350.degree. to 550.degree.C under the atmospheric pressure at a space velocity of 100 to 10,000 hr.sup.-.sup.1 in the presence of a catalyst prepared by immersing silica-alumina or a silica-alumina mixture containing a promoter in an aqueous solution of ammonium halide such as ammonium chloride, ammonium iodide or ammonium bromide at a concentration of not more than 20% by weight at room temperature to 80.degree.C, washing the immersed silica-alumina or the mixture with water, and drying and calcining the same at 300.degree.C or higher. Regeneration of the catalyst after the reaction can be carried out for a much shortened time.
Claims5
A process for producing pyridine bases, which comprises reacting at least one aliphatic carbonyl compound selected from the group consisting of formaldehyde, acetaldehyde, propionaldehyde, acrolein and acetone with 0.2 to 5 moles of ammonia per mole of the total carbonyl compounds in a gas phase at 350.degree.C to 550.degree.C at atmospheric pressure at a space velocity of 100 to 10,000 hr.sup..sup.-1 in the presence of a catalyst consisting essentially of 95 to 70% by weight of silica and 5 to 30% by weight of alumina obtained by immersing silica-alumina in an aqueous solution of ammonium chloride, ammonium bromide or ammonium iodine at 25 to 80.degree.C for 30 minutes to 5 days, washing with water, drying and calcining at 300.degree.C or higher.
Dependencies are inferred from the claim text.