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Multi-stage preparation process of carbonyl synthesizing aldehyde and/or alcohol

A technology of hydroformylation and reaction, applied in the field of multi-stage preparation of oxo aldehyde and/or alcohol, and can solve problems such as ineffective conversion and unfavorable energy

Inactive Publication Date: 2002-01-30
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As in the process described above, higher olefins with more than 5 carbon atoms cannot be efficiently converted on an industrial scale due to the high boiling points of the starting materials and products
So the transformation in the gas phase is energetically unfavorable

Method used

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  • Multi-stage preparation process of carbonyl synthesizing aldehyde and/or alcohol
  • Multi-stage preparation process of carbonyl synthesizing aldehyde and/or alcohol
  • Multi-stage preparation process of carbonyl synthesizing aldehyde and/or alcohol

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Experimental program
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Effect test

Embodiment approach 1

[0025] The method of embodiment 1 is as block flow process figure 1shown. The olefin mixture 3 , the synthesis gas 2 (carbon monoxide and hydrogen) and the catalyst solution or catalyst precursor 4 are fed into the first hydroformylation reactor 1 . The resulting hydroformylation mixture 5 is depressurized, the depressurized gas 7 (unconsumed synthesis gas) is vented, and the catalyst 4 is removed from the depressurized hydroformylation mixture in a first catalyst removal step 6, The catalyst is then returned to the first hydroformylation reactor 1 after optionally removing a small portion of the catalyst stream and making up with fresh catalyst. Catalyst here also refers to a catalyst precursor, for example, a cobalt(II) salt solution. In a distillation column 9 , the catalyst-free hydroformylation mixture 8 is separated into a low-boiling component 10 mainly composed of unreacted olefins and a crude aldehyde 11 . Low boiling point components 10 , synthesis gas 13 and cata...

Embodiment approach 2

[0030] A block flow diagram of another embodiment of the method of the present invention is as figure 2 shown. The olefin mixture 3 , the synthesis gas 2 (carbon monoxide and hydrogen) and the catalyst 4 or its precursor are fed into the first hydroformylation reactor 1 . The hydroformylation mixture 5 thus obtained is depressurized, the depressurized gas 7 (unconsumed synthesis gas) is vented off, and the catalyst 4 is removed from the depressurized hydroformylation mixture in a first catalyst removal step 6 , optionally removing a small portion of the catalyst stream and making up with fresh catalyst, the catalyst is then returned to the first hydroformylation reactor 1 . The catalyst-free hydroformylation mixture 8 is fed to a distillation column 9, where the hydroformylation mixture 8 is combined with the catalyst-free hydroformylation mixture from the second hydroformylation reactor 12 Together, the mixture 18 is separated into a low boiling fraction 10 containing unre...

Embodiment approach 3

[0035] Yet another embodiment of the method of the present invention is as image 3 shown. The olefin mixture 3 , the synthesis gas 2 (carbon monoxide and hydrogen) and the catalyst solution or its precursor 4 are fed into the first hydroformylation reactor 1 . The hydroformylation mixture 5 thus obtained is depressurized together with the hydroformylation mixture 14 from the second hydroformylation reactor 12 to form a combined hydroformylation effluent 15 which is discharged under reduced pressure Gas 7 (unconsumed syngas). In catalyst removal step 6, catalyst 16 is removed from the combined hydroformylation reaction effluent to obtain a mixture 8 comprising formed aldehydes, alcohols and unreacted olefins. After optionally removing a portion of the catalyst stream and making up with fresh catalyst, the catalyst 16 is then again divided into two substreams 4 and 17 . Substream 4 is returned to the first hydroformylation reactor 1 and substream 17 is returned to the second...

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Abstract

A multistage cobalt- or rhodium catalyzed hydroformylation of 6-24C olefins to alcohols and aldehydes comprises: (a) hydroformylation of the olefin to a conversion of 20-98%; (b) removal of the catalyst from the resulting reaction mixture; (c) separation of the resulting reaction mixture into a low boiling fraction containing olefins and paraffins and a sump fraction containing aldehyde and alcohol; and (d) reaction of the low boiling fraction containing olefin in further process stages comprising steps (a), (b) and (c) and combining all sump fractions from step (c) of all process stages.

Description

technical field [0001] The present invention relates to the preparation of aldehydes having 7 to 25 carbon atoms by subjecting corresponding alkenes to multistage cobalt- or rhodium-catalyzed hydroformylation. Background technique [0002] It is known that higher aldehydes, especially aldehydes with 7-25 carbon atoms, can be prepared by catalytic hydroformylation of olefins with one less carbon atom (commonly referred to as oxo synthesis in the industry). The resulting aldehydes are useful, for example, as synthetic precursors for the preparation of carboxylic acids and fragrances. Industrially, the abovementioned aldehydes are usually converted by catalytic hydrogenation into the corresponding alcohols, which are used inter alia as intermediates for the production of plasticizers and detergents. [0003] A number of olefin hydroformylation processes have been described in the literature. The choice of catalyst system and optimal reaction conditions f...

Claims

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Application Information

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IPC IPC(8): C07C27/22C07B61/00C07C29/141C07C29/16C07C31/20C07C45/50C07C45/78C07C45/82C07C47/02C07C47/12
CPCC07C45/50C07C29/16C07C31/125C07C47/02C07C45/78
Inventor B·肖尔茨F·尼尔利希A·凯兹克D·赫斯W·比施肯K·-D·韦瑟D·雷特格尔G·普罗茨曼
Owner EVONIK DEGUSSA GMBH
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