公开(公告)号：US20110245517A1

公开(公告)日：2011-10-06

申请号：US12740468

申请日：2009-11-05

Applicant: Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Ralf Freyberger

Inventor： Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Ralf Freyberger

IPC: C07D307/08

CPC classification number: C07D307/08

Abstract: The present invention relates to a process for preparing tetrahydrofuran by absorption of C4-dicarboxylic acids and/or derivatives thereof from a crude product mixture into an organic solvent or water as absorption medium, removal of the absorption medium, catalytic hydrogenation of the resulting C4-dicarboxylic acids and/or derivatives thereof and distillation of the water-comprising crude tetrahydrofuran in at least one distillation column, wherein THF-comprising waste streams from the distillation are catalytically hydrogenated with complete or partial recirculation to the process.

Abstract translation: 本发明涉及通过将C4-二羧酸和/或其衍生物从粗产物混合物吸收到作为吸收介质的有机溶剂或水中，去除吸收介质，催化氢化所得C4-二羧酸和/ 二羧酸和/或其衍生物，并在至少一个蒸馏塔中蒸馏含水的粗四氢呋喃，其中来自蒸馏的含THF的废物流通过完全或部分再循环进行催化氢化。

公开(公告)号：US20110021789A1

公开(公告)日：2011-01-27

申请号：US12935894

申请日：2009-03-23

Applicant: Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Wolf-Steffen Weissker ,  Jörg Heilek ,  Thomas Krug ,  Ralf Freyberger

Inventor： Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Wolf-Steffen Weissker ,  Jörg Heilek ,  Thomas Krug ,  Ralf Freyberger

IPC: C07D307/60

CPC classification number: C07C51/573 ,  C07C57/145

Abstract: A process for decreasing fumaric acid deposits in the preparation of maleic anhydride by heterogeneously catalyzed oxidation of a hydrocarbon with molecular oxygen, in which the maleic anhydride is absorbed from the crude product mixture in an absorbent in an absorption column and desorbed again in a desorption column, the entirety or a portion of the absorbent depleted in maleic anhydride, for controlled precipitation of fumaric acid, being cooled and/or concentrated by evaporating a portion of the absorbent to such an extent that the difference between the concentration of fumaric acid in the recycle stream at the outlet of the desorption column under the conditions existing there and the equilibrium concentration of fumaric acid according to the solubility curve after the cooling and/or evaporation of a portion of the absorbent is greater than or equal to 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.

Abstract translation: 一种通过用分子氧异构催化氧化烃来减少马来酸酐制备中的富马酸沉积物的方法，其中马来酸酐在吸收塔中的吸收剂中从粗产物混合物中吸收并在解吸塔中再解吸 ，通过将一部分吸收剂蒸发而使富马酸的受控沉淀的全部或一部分吸收剂消耗马来酸酐，从而将富马酸的控制沉淀冷却和/或浓缩至使回收物中的富马酸浓度之间的差异 在存在的条件下在解吸塔的出口处的流，并且在一部分吸收剂的冷却和/或蒸发之后，根据溶解度曲线的富马酸的平衡浓度大于或等于250重量ppm， 作为固体沉淀的富马酸被完全或部分地从吸收剂循环系统中除去 em和富马酸贫乏的吸收剂被完全或部分地再循环到吸收塔。

公开(公告)号：US08476463B2

公开(公告)日：2013-07-02

申请号：US12935894

申请日：2009-03-23

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

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

IPC: C07D307/36 ,  C07D307/34

CPC classification number: C07C51/573 ,  C07C57/145

Abstract: 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.

Abstract translation: 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。