Composite-oxide catalyst and process for production of acrylic acid using said catalyst

A composite oxide and catalyst technology, which is applied in the preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, carbon-based compounds, etc. Excellent effect with excellent catalyst life

Inactive Publication Date: 2004-09-01
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods are methods of suppressing hot spots from becoming too high, and hot spots themselves are still formed in the same way as before.
In short, the problem of catalyst performance degradation caused by hot spots cannot be said to be fundamentally resolved, and there is still room for improvement
[0006] On the other hand, when acrylic acid is produced by gas-phase catalytic oxidation of acrolein using a catalyst, many hot spots are usually formed in the catalyst, and it is very difficult in practice to completely eliminate the formation of hot spots.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] That is, other acrylic acid production methods mentioned in the present invention are acrylic acid production methods including the following steps: introducing a mixed gas containing high concentrations of propylene and oxygen and practically no steam into a tank filled with molybdenum and Step (1) of preparing acrolein-containing gas in a fixed-bed multi-tubular first reactor of a composite oxide catalyst having bismuth as an essential component, introducing the acrolein-containing gas into a reactor filled with molybdenum and vanadium In the fixed-bed multi-tubular second reactor of the composite oxide catalyst, the step (2) of preparing acrylic acid-containing gas, and the step of introducing the above-mentioned acrylic acid-containing gas into an acrylic acid absorption tower to form a high-concentration acrylic acid solution for trapping ( 3) It is characterized in that, as the composite oxide catalyst filled in the above-mentioned fixed-bed multi-tubular second re...

Embodiment 1

[0052] (Preparation of Fe-Mo precursor)

[0053] While heating and stirring 500 ml of pure water, 21.9 g of ammonium paramolybdate was dissolved therein. In addition, 33.4 g of iron nitrate was dissolved in 150 ml of pure water while heating and stirring. After mixing the obtained two solutions, the mixture was kept at a temperature of 80° C. for 1 hour while stirring, and then the water was removed, followed by heat treatment at 500° C. for 3 hours. The obtained solid matter was pulverized to a particle size of 100 μm or less to prepare a Fe—Mo precursor.

[0054] (catalyst preparation)

[0055] While heating and stirring 2000 ml of pure water, 328 g of ammonium paramolybdate, 96.6 g of ammonium metavanadate, and 53.5 g of ammonium paratungstate were dissolved therein. Moreover, while heating and stirring 200 g of pure water, 79.8 g of copper nitrate and 4.8 g of antimony trioxide were added. After mixing the two obtained solutions, add the pre-prepared Fe-Mo precursor, p...

Embodiment 2

[0068] (Preparation of Fe-Mo precursor)

[0069] While heating and stirring 500 ml of pure water, 87.5 g of ammonium paramolybdate was dissolved therein. In addition, 133 g of iron nitrate was dissolved in 150 ml of pure water while heating and stirring. After mixing the obtained two solutions, the mixture was kept at a temperature of 80° C. for 1 hour while stirring, and then the water was removed, followed by heat treatment at 500° C. for 3 hours. The obtained solid matter was pulverized to a particle size of 100 μm or less to prepare a Fe—Mo precursor.

[0070] (catalyst preparation)

[0071] While heating and stirring 2000 ml of pure water, 262.5 g of ammonium paramolybdate, 96.6 g of ammonium metavanadate, and 53.5 g of ammonium paratungstate were dissolved therein. Moreover, while heating and stirring 200 g of pure water, 79.8 g of copper nitrate and 4.8 g of antimony trioxide were added. After mixing the two obtained solutions, add the pre-prepared Fe-Mo precursor, ...

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Abstract

There are disclosed a catalyst and a process for production of acrylic acid using this catalyst, wherein, even under conditions where hot spots are formed, the catalyst is excellent in activity, selectivity, and catalyst life time and displays stable performances for a long time. The catalyst is shown by the following formula (1): MoaVbWcCudAeBfCgOx (1) (wherein: A is at least one species selected from among cobalt, nickel, iron, lead, and bismuth; B is at least one species selected from among antimony, niobium, and tin; and C is at least one species selected from among silicon, aluminum, titanium, and zirconium; and further, a, b, c, d, e, f, g, and x are atomic ratios of Mo, V, W, Cu, A, B, C, and O respectively; and, in the case of a=12, the following inequalities are satisfied: 2<=b<=15; 0 B01J 23 / 88 B01J 23 / 28 C07C 57 / 04 C07C 51 / 25 0 17 2 2004 / 2 / 27 1524615 2004 / 9 / 1 100382889 2008 / 4 / 23 2008 / 4 / 23 2008 / 4 / 23 Nippon Catalytic Chem Ind Japan Hirao Harunori Tanimoto Michio chen cuan 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2003 / 2 / 27 051794 / 2003

Description

technical field [0001] The present invention relates to a composite oxide catalyst used in the preparation of acrylic acid and a method for preparing acrylic acid using the catalyst. Background technique [0002] Many proposals have been made regarding improved catalysts for the efficient production of acrylic acid by gas-phase catalytic oxidation of acrolein. For example, catalysts made of molybdenum, vanadium, and tungsten (refer to, for example, Japanese Patent Publication No. 44-12129), catalysts composed of molybdenum, vanadium, copper, tungsten, and chromium (refer to, for example, Japanese Patent Publication No. 49-11371), molybdenum , a catalyst composed of vanadium (see, for example, JP-A-50-25914), a catalyst composed of molybdenum, vanadium, copper, and at least one of antimony and germanium (see, for example, JP-A-52-85091). [0003] However, these conventional catalysts have the problem that the molybdenum component sublimates during the long-term use of the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/88B01J23/00B01J23/84B01J23/888B01J35/00C07B61/00C07C45/35C07C51/235C07C51/25C07C57/055
CPCB01J23/8885C07C51/252B01J35/0006B01J23/002C07C45/35B01J2523/00C07C47/22C07C57/04B01J2523/54B01J2523/68B01J2523/17B01J2523/53B01J2523/55B01J2523/69B01J2523/842B61L15/0027
Inventor 谷本道雄平尾晴纪
Owner NIPPON SHOKUBAI CO LTD
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