Preparation of acrolein or acrylic acid involves conducting starting reaction gas mixture having propylene and molecular oxygen reactants and inert molecular nitrogen and propane diluent gasses through fixed catalyst bed

摘要

Acrolein or acrylic acid is prepared by catalyzing partial gas phase oxidation of propene, where a starting reaction gas mixture having propylene and molecular oxygen reactants and inert molecular nitrogen and propane diluent gasses is conducted at elevated temperature through a fixed catalyst bed whose active composition is a multimetal oxide having molybdenum, iron and bismuth. Preparation of acrolein or acrylic acid involves catalyzing partial gas phase oxidation of propene, where a starting reaction gas mixture having propylene and molecular oxygen reactants and the inert molecular nitrogen and propane diluent gasses and having the molecular oxygen and the propylene in a molar oxygen;C 3H 6 ratio of >=1 is conducted at elevated temperature through a fixed catalyst bed whose active composition is a multimetal oxide having molybdenum, iron and bismuth based on its total volume of 6-9 vol.% propylene, 8-18 vol.% molecular oxygen. 6-30 vol.% propane and 32-72 vol.% molecular nitrogen. The molar ratio V 1 of propane in starting reaction gas mixture to propylene in starting reaction gas mixture is 1-4. The molar V 2 of molecular nitrogen present in starting reaction gas mixture to molecular oxygen in starting reaction the mixture is 2-6, and the molar ratio of the molecular oxygen in starting reaction gas mixture to propylene in starting reaction mixture is 1.3-2.4.