会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 10. 发明专利
    • The method of heterogeneously catalyzed partial gas phase oxidation of propylene to form the acrylic acid
    • JP2009520747A
    • 2009-05-28
    • JP2008546369
    • 2006-12-11
    • ビーエーエスエフ ソシエタス・ヨーロピアBasf Se
    • ハイレク イェルクヨアヒム ミュラー−エンゲル クラウスディーテルレ マルティン
    • C07C51/25C07B61/00C07C51/43C07C57/05
    • C07C51/252B01J23/002B01J2523/00C07C45/35C07C51/43C07C47/22C07C57/04B01J2523/54B01J2523/68B01J2523/842B01J2523/17B01J2523/55B01J2523/69B01J2523/13B01J2523/41B01J2523/845
    • Heterogeneously catalyzed partial gas phase oxidation of propylene to acrylic acid comprises introducing a reaction gas initial mixture (1) into a first reaction zone; reducing the temperature of the product gas mixture (1) by direct and/or indirect cooling, and adding a secondary gas to the product gas mixture (1); and subsequently introducing the product gas mixture (1), into a second reaction stage; and subsequently transferring the product gas mixture (2) containing acrylic acid in a first separation zone into the condensed phase and subsequently in a second separation zone. Heterogeneously catalyzed partial gas phase oxidation of propylene to acrylic acid comprises introducing a reaction gas initial mixture (1) containing propylene and molecular oxygen in a molar ratio of >=, 1 and at least an inert dilution gas in a first reaction stage, into a first reaction zone through at least a first catalyst bed at increased temperature, where the catalyst exhibit at least a multi-metal oxide (A) containing molybdenum, iron and bismuth as active mass, such that the propylene conversion during a single passage through the catalyst bed is >= 90 mol.% and the resulting selectivity of the acrolein- and acrylic acid by-product- formation is >= 80 mol.%; reducing the temperature of the product gas mixture (1) from the first reaction stage by direct and/or indirect cooling, and adding a secondary gas in the form of molecular oxygen and/or inert gas to the product gas mixture (1); and subsequently introducing the product gas mixture (1) as a reaction gas initial mixture (2) containing molecular oxygen and acrolein in a molar ratio of >= 0.5 and at least an inert dilution gas, in a second reaction stage at increased temperature by at least a second catalyst bed, whose catalysts exhibits multi-metal oxide (A1) containing at least an molybdenum and vanadium as active mass in such a way that the acrolein conversion during a single passage through the catalyst bed is >= 90 mol % and the selectivity of the acrylic acid formation over both the reaction stages is >= 70 mol %, with respect to converted propylene; subsequently transferring the product gas mixture (2) containing acrylic acid in a first separation zone into the condensed phase and subsequently in a second separation zone, where: the acrylic acid is separated from the condensed phase by application of at least a thermal separation process comprising at least a crystallization separation of the acrylic acid, and the reaction gas initial mixture (1) contains cyclopropane (up to 3 mol.%), with respect to the propylene.