发明授权
- 专利标题： Process for separating off fumaric acid and other minor components during the production of maleic anhydride
- 专利标题（中）： 在马来酸酐生产过程中分离富马酸和其他次要成分的方法
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申请号： US12935894申请日： 2009-03-23
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公开(公告)号： US08476463B2公开(公告)日： 2013-07-02
- 发明人: Gunther Windecker , Jens Weiguny , Alexander Weck , Ellen Dahlhoff , Wolf-Steffen Weiβker , Jörg Heilek , Thomas Krug , Ralf Freyberger
- 申请人： Gunther Windecker , Jens Weiguny , Alexander Weck , Ellen Dahlhoff , Wolf-Steffen Weiβker , Jörg Heilek , Thomas Krug , Ralf Freyberger
- 申请人地址： DE
- 专利权人： BASF SE
- 当前专利权人： BASF SE
- 当前专利权人地址： DE
- 代理机构： Novak Druce Connolly Bove + Quigg LLP
- 优先权： EP08153909 20080401
- 国际申请： PCT/EP2009/053338 WO 20090323
- 国际公布： WO2009/121735 WO 20091008
- 主分类号： C07D307/36
- IPC分类号： C07D307/36 ; C07D307/34
摘要：
Processes for decreasing fumaric acid deposits in preparing maleic anhydride by heterogeneously catalyzed oxidation of a hydrocarbon with molecular oxygen. Maleic anhydride is absorbed from the crude mixture in an absorbent in an absorption column and desorbed in a desorption column, the entirety or portion of absorbent depleted in maleic anhydride, for controlled precipitation of fumaric acid, being cooled and/or concentrated by evaporating a portion of absorbent such that the difference between the concentration of fumaric acid in the recycle stream at the outlet of the desorption column under existing conditions and the equilibrium concentration of fumaric acid according to the solubility curve after cooling and/or evaporation of a portion of absorbent is ≧250 ppm by weight, and the fumaric acid precipitated as a solid is removed completely or partly from the absorbent recycling system and the fumaric acid-depleted absorbent is recycled completely or partly to the absorption column.
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