METHOD FOR PRODUCING ACROLEIN AND ACRYLIC ACID WITH A FIXED-BED MULTITUBULAR REACTOR
申请人:Nippon Shokubai Co., Ltd.
公开号:US20150045581A1
公开(公告)日:2015-02-12
This invention provides a method for producing acrolein and/or acrylic acid by catalytic gas-phase oxidation, which method makes it possible to carry out a continuous operation steadily for a long period of time while a high yield is maintained.
This method is characterized by comprising filling each of reaction tubes of a fixed-bed multitubular reactor with at least two species of catalysts each of which essentially comprises, as catalytically active components, oxide of molybdenum, oxide of bismuth and oxide of iron and/or composite oxide of at least two of said elements, said at least two species of catalysts being different in the ratio of D1/D2, D1 denoting the proportion of the total pore volume of pores whose pore diameter falls within the range of at least 0.03 μm and less than 0.3 μm to the total pore volume of the whole pores, and D2 denoting the proportion of the total pore volume of pores whose pore diameter falls within the range of at least 0.3 μm and at most 3 μm to the total pore volume of the whole pores, in such a manner that at least two reaction zones are formed axially in each of the reaction tubes.
这项发明提供了一种通过催化气相氧化来生产丙烯醛和/或丙烯酸的方法,该方法使得在保持高产率的同时能够稳定地进行长时间连续操作。
该方法的特点在于,将固定床多管反应器的每个反应管填充至少两种催化剂,每种催化剂基本上包括钼氧化物、铋氧化物和铁氧化物和/或至少两种所述元素的复合氧化物作为催化活性组分,这至少两种催化剂在D1/D2比率上不同,其中D1表示孔径在至少0.03μm至小于0.3μm范围内的孔的总孔体积与整个孔的总孔体积之比,D2表示孔径在至少0.3μm至最多3μm范围内的孔的总孔体积与整个孔的总孔体积之比,以至少形成两个反应区域轴向地在每个反应管内。