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    • 29. 发明授权
    • Multi-layer catalyst for producing phthalic anhydride
    • 用于生产邻苯二甲酸酐的多层催化剂
    • US07718561B2
    • 2010-05-18
    • US11597307
    • 2005-05-22
    • Christian GückelMarkus NiedermeierMarvin Estenfelder
    • Christian GückelMarkus NiedermeierMarvin Estenfelder
    • C07D307/89
    • B01J37/0221B01J21/063B01J23/002B01J23/22B01J27/198B01J35/0006B01J35/008B01J35/10B01J35/1014B01J35/1066B01J37/0219B01J2523/00C07C51/265C07C51/313C07C63/16B01J2523/47B01J2523/51B01J2523/53B01J2523/55B01J2523/15
    • The present invention relates to a catalyst for preparing phthalic anhydride by gas phase oxidation of o-xylene and/or naphthalene, comprising at least three catalyst zones which have different compositions and, from the gas inlet side toward the gas outlet side, are referred to as first, second and third catalyst zone, the catalyst zones having in each case an active composition comprising TiO2, and the active composition content decreasing from the first catalyst zone disposed toward the gas inlet side to the third catalyst zone disposed toward the gas outlet side, with the proviso that (a) the first catalyst zone has an active composition content between about 7 and 12% by weight, (b) the second catalyst zone has an active composition content in the range between 6 and 11% by weight, the active composition content of the second catalyst zone being less than or equal to the active composition content of the first catalyst zone, and (c) the third catalyst zone has an active composition content in the range between 5 and 10% by weight, the active composition content of the third catalyst zone being less than or equal to the active composition content of the second catalyst zone. Also described is a preferred process for preparing such a catalyst and the preferred use of the titanium dioxide used in accordance with the invention.
    • 本发明涉及通过邻二甲苯和/或萘的气相氧化制备邻苯二甲酸酐的催化剂,其包括至少三个具有不同组成的催化剂区域和从气体入口侧朝向气体出口侧的催化剂区域 作为第一,第二和第三催化剂区域,催化剂区域在每种情况下都具有包含TiO 2的活性组合物,并且活性组合物含量从朝向气体出口侧设置的气体入口侧至第三催化剂区域的第一催化剂区域减少 条件是(a)第一催化剂区的活性组合物含量在约7至12重量%之间,(b)第二催化剂区的活性组成含量在6重量%至11重量%的范围内, 第二催化剂区的活性组合物含量小于或等于第一催化剂区的活性组合物含量,和(c)第三催化剂区具有活性组分 n含量在5至10重量%的范围内,第三催化剂区的活性组成含量小于或等于第二催化剂区的活性组合物含量。 还描述了制备这种催化剂的优选方法和根据本发明使用的二氧化钛的优选用途。