发明名称 |
Method for producing unsaturated nitrile |
摘要 |
A method for producing an unsaturated nitrile by subjecting propane to a vapor-phase catalytic ammoxidation reaction using a fluidized bed reactor in the presence of a composite oxide catalyst containing Mo, V, and Nb, the method comprising the step of: adding a tungsten compound into the fluidized bed reactor to adjust a molar ratio (W/Mo ratio) of tungsten contained in a tungsten compound to molybdenum contained in the composite oxide catalyst that exist within the fluidized bed reactor so that the molar ratio is in the range of 0.0001 to 0.1. |
申请公布号 |
US9464039(B2) |
申请公布日期 |
2016.10.11 |
申请号 |
US201113994230 |
申请日期 |
2011.10.13 |
申请人 |
ASAHI KASEI CHEMICALS CORPORATION |
发明人 |
Tamura Sho;Shoji Sadao |
分类号 |
C07C253/24;B01J23/30;B01J23/00;B01J23/28;B01J27/057 |
主分类号 |
C07C253/24 |
代理机构 |
Birch, Stewart, Kolasch & Birch, LLP |
代理人 |
Birch, Stewart, Kolasch & Birch, LLP |
主权项 |
1. A method for producing an unsaturated nitrile, comprising:
subjecting propane to a vapor-phase catalytic ammoxidation reaction using a fluidized bed reactor in the presence of a composite oxide catalyst, to produce the unsaturated nitrile, wherein a tungsten compound is added into the fluidized bed reactor during the vapor-phase catalytic ammoxidation reaction, to adjust a molar ratio (W/Mo ratio) of a tungsten contained in the tungsten compound to a molybdenum contained in the composite oxide catalyst that exist within the fluidized bed reactor so that the molar ratio is in a range of 0.0001 to 0.1, and the composite oxide catalyst comprises a composite oxide represented by the following composition formula (1):
Mo1VaNbbAcXdZeOn (1) wherein component A represents at least one or more elements selected from Te and Sb; component X represents at least one or more elements selected from W, Bi, and Mn; component Z represents at least one or more elements selected from La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; a, b, c, d, e, and n each represent an atomic ratio of the corresponding element per Mo atom; a is in a range of 0.01≦a≦1; b is in a range of 0.01≦b≦1; c is in a range of 0.01≦c≦1; d is in a range of 0≦d≦1; e is in a range of 0≦e≦1; and n represents a number determined by valences of the component elements; and said method further comprising (1) extracting a mixture of the composite oxide catalyst and the tungsten compound from the fluidized bed reactor during the vapor-phase catalytic ammoxidation reaction; (2) measuring a temporary value of the W/Mo ratio from the mixture obtained by (1); and (3) controlling the W/Mo ratio to fall within the range of 0.0001 to 0.1 based on the temporary value measured in (2). |
地址 |
Tokyo JP |