发明名称 |
Use of foam bodies in oxidation reactors for preparing unsaturated aldehydes or carboxylic acids |
摘要 |
The present invention relates to a process for preparing unsaturated aldehydes or unsaturated carboxylic acids by heterogeneous catalytic gas phase oxidation of unsaturated or saturated hydrocarbons, comprising the process steps of: i) providing a gas mixture comprising a saturated hydrocarbon and catalytically dehydrogenating the saturated hydrocarbon in the gas phase to obtain a gas mixture comprising an unsaturated hydrocarbon in a dehydrogenation reactor having a dehydrogenation catalyst material; or ii) providing a gas mixture comprising oxygen and an unsaturated hydrocarbon; iii) catalytically oxidizing the unsaturated hydrocarbon obtained in process step i) or provided in process step ii) in the gas phase to obtain a gas mixture comprising an unsaturated aldehyde in a first oxidation reactor having a first oxidation catalyst material; wherein at least one of the reactors selected from the dehydrogenation reactor, the first oxidation reactor and the second oxidation reactor comprises at least one foam body. |
申请公布号 |
US8841481(B2) |
申请公布日期 |
2014.09.23 |
申请号 |
US200913060599 |
申请日期 |
2009.07.29 |
申请人 |
Evonik Degussa GmbH |
发明人 |
Zanthoff Horst-Werner;Brausch Nicole;Kuppinger Franz-Felix;Sauer Jorg;Sabbagh Andreas;Fruhling Dennis;Weber Markus;Becker Oliver |
分类号 |
C07C45/35;C07C57/04;B01J37/02;C07C5/333;C07C51/25;B01J23/00;B01J19/24;B01J35/04;B01J8/06;B01J23/888 |
主分类号 |
C07C45/35 |
代理机构 |
Smith Moore Leatherwood LLP |
代理人 |
Smith Moore Leatherwood LLP ;McCann Philip P.;Zimmer John P. |
主权项 |
1. A process for preparing unsaturated aldehydes or unsaturated carboxylic acids by heterogeneous catalytic gas phase oxidation of unsaturated or saturated hydrocarbons, comprising the process steps of:
i) providing a gas mixture at least comprising a saturated hydrocarbon and catalytically dehydrogenating the at least one saturated hydrocarbon in the gas phase to obtain a gas mixture comprising an unsaturated hydrocarbon in a dehydrogenation reactor having a dehydrogenation catalyst material; or ii) providing a gas mixture at least comprising oxygen and at least one unsaturated hydrocarbon wherein unsaturated hydrocarbon has a space velocity of at least 150 liters/hr; iii) catalytically oxidizing the unsaturated hydrocarbon obtained in process step i) or provided in process step ii) in the gas phase to obtain a gas mixture comprising an unsaturated aldehyde in a first oxidation reactor having a first oxidation catalyst material; iv) catalytically oxidizing the unsaturated aldehyde obtained in process step iii) in the gas phase to obtain a gas mixture comprising an unsaturated carboxylic acid in a second oxidation reactor having a second oxidation catalyst material; wherein at least one of the reactors selected from the dehydrogenation reactor, the first oxidation reactor and the second oxidation reactor comprises at least one open-cell foam body and the foam body is characterized by a cell width within a range of from 10 to 40 ppi, and wherein the foam bodies are present in the form of random packings, such random packings are characterized in that they have a diameter which is at most 50% and at least 5% of the diameter of the reactor, in the case of a tube bundle reactor, of the diameter of the particular reaction tubes, and, in the case of a wall reactor, of the distance between two adjacent plates, or in the form of blocks, such blocks are characterized in that they have a diameter which is at least 90% of the diameter of the reactor, in the case of a tube bundle reactor, of the diameter of the particular reaction tubes, and, in the case of a wall reactor, of the distance between two adjacent plates. |
地址 |
Essen DE |