| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
UP-0843632
(2004-05-12)
|
| 등록번호 |
US-7589046
(2009-09-24)
|
| 우선권정보 |
DE-103 25 487(2003-06-04); DE-103 60 057(2003-12-19) |
|
발명자
/ 주소 |
- Dieterle, Martin
- Poepel, Wolfgang Juergen
- Berndt, Silke
- Felder, Raimund
- Unverricht, Signe
- Mueller Engel, Klaus Joachim
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
|
| 인용정보 |
피인용 횟수 :
3 인용 특허 :
46 |
초록
▼
In a process for the thermal treatment of the precursor material of a catalytically active material in a rotary tube furnace through which a gas stream flows, at least a proportion of the gas stream flowing through the rotary tube furnace is circulated, and the associated rotary tube furnace apparat
In a process for the thermal treatment of the precursor material of a catalytically active material in a rotary tube furnace through which a gas stream flows, at least a proportion of the gas stream flowing through the rotary tube furnace is circulated, and the associated rotary tube furnace apparatus and tube-bundle reactors for the partial gas-phase oxidation of acrolein to acrylic acid are loaded with catalysts whose catalytically active material is obtainable by the process for the thermal treatment.
대표청구항
▼
We claim: 1. A process for the thermal treatment of a precursor material of a catalytically active multi-element oxide material, comprising thermally treating the precursor material in a rotary tube furnace through which a gas stream flows at a material temperature of from 300° C. to 450° C. to for
We claim: 1. A process for the thermal treatment of a precursor material of a catalytically active multi-element oxide material, comprising thermally treating the precursor material in a rotary tube furnace through which a gas stream flows at a material temperature of from 300° C. to 450° C. to form the catalytically active multi-element oxide material, wherein the catalytically active multi-element oxide material comprises the elements Mo, V, and at least one of the elements Nb and W, wherein the molar fraction of the element Mo in the catalytically active multi-element material, based on the total amount of all elements other than oxygen in the catalytically active multi-element oxide material, ranges from 20 mol % to 80 mol %, wherein the molar ratio of Mo to V in the catalytically active multi-element oxide material, Mo/V, ranges from 15:1 to 1:1, wherein the molar ratio Mo/(W and Nb) ranges from 80:1 to 1:4, wherein the precursor material is obtained by a process comprising preparing an intimate dry blend comprising ammonium ions from starting compounds, wherein the starting compounds comprise the elemental constituents of the multi-element oxide material other than the oxygen, wherein the gas in the gas stream comprises from 0.5% to 4% by volume of O2 at every point in time during the thermally treating, from 1% to 8% by volume of NH3, averaged over the total duration of thermally treating, and steam and/or inert gas in residual amounts, wherein the NH3 content in the gas stream during the thermally treating passes through a maximum that is below 20% by volume, wherein at least a portion of the gas stream flowing through the rotary tube furnace is circulated, and wherein no additional amount of NH3 is added to the gas stream during the thermal treatment process. 2. The process as claimed in claim 1, wherein the pressure in the rotary tube furnace is below the ambient pressure. 3. The process claimed in claim 1, wherein the gas stream in the rotary tube comprises at least one of CO2, acetic acid, NOx, NH3, CO, SO2 and acetonitrile. 4. The process as claimed in claim 1, wherein the circulated portion of the gas stream flowing through the rotary tube furnace is fed via a cyclone. 5. The process as claimed in claim 1, wherein the temperature of the treated precursor material at the end of the thermal treatment is reduced by at least 300° C. in the course of a period of ≧0.5 h and ≦5 h. 6. The process as claimed in claim 1, wherein, for regulating the total amount of gas stream fed to the rotary tube, the principle of mass flow rate measurement based on Coriolis forces, the principle of aperture plate measurement based on pressure differences or the principle of thermal convection is used. 7. The process as claimed in claim 1, which is carried out in a rotary tube furnace apparatus which comprises: a) at least one recycle gas compressor; b) at least one exit gas compressor; c) at least one pressure reducer; d) at least one fresh gas feed; e) at least one heatable rotary tube and f) at least one recycle gas pipe. 8. The process as claimed in claim 7, wherein the rotary tube furnace apparatus additionally comprises at least one control valve. 9. The process as claimed in claim 7, wherein the rotary tube furnace apparatus additionally comprises at least one cyclone. 10. The process as claimed in claim 7, wherein the rotary tube furnace apparatus additionally comprises an apparatus for rapid cooling, which comprises an envelope which surrounds the rotary tube and has, on one side, orifices through which ambient air is aspirated by means of a fan and can be discharged through flaps present on the opposite side of the envelope and having an adjustable orifice. 11. The process as claimed in claim 1, wherein the residence time of the precursor material in the rotary tube furnace is ≧5 h.
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