公开(公告)号：US08476463B2

公开(公告)日：2013-07-02

申请号：US12935894

申请日：2009-03-23

申请人： Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Wolf-Steffen Weiβker ,  Jörg Heilek ,  Thomas Krug ,  Ralf Freyberger

发明人： Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Wolf-Steffen Weiβker ,  Jörg Heilek ,  Thomas Krug ,  Ralf Freyberger

IPC分类号： C07D307/36 ,  C07D307/34

CPC分类号： C07C51/573 ,  C07C57/145

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.

摘要翻译： 通过用分子氧异构催化氧化烃来减少富马酸沉积物制备​​马来酸酐的方法。 马来酸酐在吸收塔中的吸收剂中从粗混合物中吸收并在解吸塔中解吸，耗尽马来酸酐的全部或部分吸收剂用于控制富马酸的沉淀，通过蒸发一部分而被冷却和/或浓缩 的吸收剂，使得在现有条件下在解吸塔出口处的再循环料流中的富马酸浓度与部分吸收剂冷却和/或蒸发后根据溶解度曲线的平均浓度的富马酸的差异是 > 250ppm（重量），并且作为固体沉淀的富马酸被完全或部分地从吸收剂再循环系统中除去，富马酸贫乏的吸收剂被完全或部分地再循环到吸收塔。