Method for producing maleic anhydride

Details Method for producing maleic anhydride Method for producing maleic anhydride

2006-08-08

2006-08-08

Dentz, Bernard (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S257000, C549S260000

Reexamination Certificate

active

07087767

ABSTRACT:
Process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms by means of oxygen-containing gases at from 350 to 500° C. in the presence of a volatile phosphorus compound over a vanadium-, phosphorus- and oxygen-containing catalyst in a shell-and-tube reactor unit having at least one reaction zone cooled by means of a heat transfer medium, in which the temperature and/or the amount of the heat transfer medium flowing into the first (relative to the feed direction) reaction zone are set so that the mean temperature of the heat transfer medium in the first reaction zone TSB(1stzone), which is calculated as the mean of the inflow temperature and the outflow temperature of the heat transfer medium, is in accordance with the formulae (I) and (II)in-line-formulae description="In-line Formulae" end="lead"?TSB(1stzone)≦TR(1stzone)−TSafety(1stzone)  (I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?TSB, Ymax(1stzone)−TA(1stzone)≦TSB(1stzone)≦TSB, Ymax(1stzone)+TB(1stzone),  (II)in-line-formulae description="In-line Formulae" end="tail"?whereTR(1stzone) is the runaway temperature of the first reaction zone;TSafety(1stzone) is the safety temperature of the first reaction zone and has a value of 1° C.;TSB, Ymax(1stzone) is the mean temperature of the heat transfer medium in the first reaction zone at which the maximum maleic anhydride yield is achieved in the range TSB(1stzone)≦TR(1stzone);TA(1stzone) is 20° C.; andTB(1stzone) is 10° C.

REFERENCES:
patent: 3919257 (1975-11-01), Milberger et al.
patent: 4795818 (1989-01-01), Becker et al.
patent: 4933312 (1990-06-01), Haddad et al.
patent: 5095125 (1992-03-01), Haddad et al.
patent: 5137860 (1992-08-01), Ebner et al.
patent: 5158923 (1992-10-01), Barone
patent: 5168090 (1992-12-01), Ebner et al.
patent: 5275996 (1994-01-01), Andrews et al.
patent: 5296436 (1994-03-01), Bortinger
patent: 5641722 (1997-06-01), Mitchell et al.
patent: 2003/0065194 (2003-04-01), Weiguny et al.
patent: 25 39 106 (1977-03-01), None
patent: 0 099 431 (1984-02-01), None
patent: 0 593 646 (1994-04-01), None
patent: 0 752 915 (1997-01-01), None
patent: WO-93/01155 (1993-01-01), None
patent: WO-95/26817 (1995-12-01), None
patent: WO-97/12674 (1997-04-01), None
patent: WO-01/68626 (2001-09-01), None
patent: WO-02/12158 (2002-02-01), None
Wellauer et al., Optimal Policies in Maleic Anhydride Production Through Detailed Reactor Modeling, Chem Eng Science, 1986, 41(4):765-772, Great Britain.
Lohbek et al., Maleic and Fumaric Acids—Maleic Anhydride (MA), 2000 Electronic Release, Ullmann's Encyclopedia of Industrial Chemistry, Sixth Ed.

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