Recovering Aldehydes from High-Boiling Hydroformylation Residues
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Solution Overview
Problem
The formation of high-boiling compounds in the hydroformylation process of olefins leads to the binding of valuable aldehydes, resulting in product loss and complicated disposal, particularly in the two-phase process where the hydroformylation catalyst remains in the organic phase, making it difficult to separate and recover the desired aldehydes.
Innovation Solution
A process involving a series of distillation columns to separate and recover aliphatic C3-C10 aldehydes from high-boiling compounds, where the reaction mixture is separated into an aqueous and organic phase, with specific conditions in each column to isolate and purify n-aldehyde while avoiding the thermal cleavage of high boilers, allowing for the recovery of n- and iso-aldehydes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reaction mixture is separated into aqueous and organic phases, then the hydroformylation catalyst is retained in the aqueous phase, but the desired aldehydes are lost in the organic phase with high-boiling compounds
Solution Approach 1:
The separation process is divided into multiple sequential distillation steps: first separating the organic phase into intermediate fractions, then further separating the high-boiling fraction into pure aldehyde and high-boiling compounds. This multi-stage segmentation allows selective recovery of aldehydes while retaining catalyst in the aqueous phase.
Solution Approach 2:
The desired aldehydes are extracted from the organic phase containing high-boiling compounds through controlled distillation. The process selectively removes aldehydes at specific temperature ranges, separating them from both the aqueous catalyst phase and the high-boiling residues.
2Manufacturing precision
If high-boiling compounds are removed by distillation, then product purity is improved, but thermal cleavage of high boilers occurs causing additional aldehyde loss
Solution Approach 1:
The distillation process is segmented into multiple columns with progressively increasing temperature thresholds. The first column removes light components, the second recovers aldehydes at moderate temperatures, and subsequent columns handle high-boiling fractions. This segmentation prevents thermal degradation by avoiding excessive heating in earlier stages.
Solution Approach 2:
Lighter components and volatile aldehydes are removed in preliminary distillation steps before the high-boiling fraction is subjected to higher temperatures. This preliminary separation prevents thermal cleavage by ensuring that only the necessary high-boiling fraction undergoes extended thermal treatment.
3Loss of substance
If multiple distillation columns are used to separate aldehydes from high boilers, then aldehyde recovery is improved, but process complexity increases
Solution Approach 1:
The separation task is divided among multiple distillation columns, each handling a specific fraction range. This segmentation enables efficient aldehyde recovery by treating different compositional ranges in separate units, optimizing separation efficiency for each stage.
Solution Approach 2:
The distillation columns are integrated into a unified process flow where the output of one column becomes the input of the next. This merging of operations creates a continuous separation train that maximizes aldehyde recovery while managing complexity through systematic arrangement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process effectively recovers 20 to 30 parts by weight of a mixture of n- and iso-aldehydes from 100 parts by weight of high boilers, reducing aldehyde loss and simplifying the disposal of high-boiling residues, thereby improving the selectivity and efficiency of the hydroformylation process.
Implementation Method 1
A process involving a series of distillation columns to separate and recover aliphatic C3-C10 aldehydes from high-boiling compounds
Implementation Method 2
by thermal treatment
Implementation Method 3
the reaction mixture removed from the hydroformylation reactor is separated into an aqueous phase containing transition metal complex compound and into an organic phase
Data Source
Figure 1
AI summary
The invention relates to a method for obtaining aliphatic C3- to C10-aldehydes from high-boiling substances accumulating in the hydroformylation of the corresponding C2- to C9-olefins in a heterogenic reaction system using an aqueous solution comprising transition metal complex compounds of Group VIII of the periodic system of the elements as a catalyst, wherein the organic phase that accumulates is subjected to separate distillation steps after separating out volatile components and after separating out the aqueous catalyst phase, and wherein the high-boiling substances are split at a high temperature in the last distillation step into a mixture of n- and iso-aldehyde that is drawn off as the top product.