Organic Nitrogen Additives for Hydroformylation Heavies Reduction
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Solution Overview
Problem
In hydroformylation processes, the formation of high-boiling aldehyde-derived byproducts, known as 'heavies,' leads to inefficiencies and increased costs due to the need for adjustments in reactor conditions and catalyst management, particularly when dealing with higher olefins, as these byproducts can accumulate and reduce catalyst life.
Innovation Solution
The introduction of a specific class of organic nitrogen compounds, such as benzimidazole, at concentrations between 0.1 to 5 weight percent in the aldehyde solution, slows the rate of heavies formation and reduces rhodium loss in catalyst solutions, even in the absence of a hydroformylation catalyst, thereby maintaining process efficiency and extending catalyst life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic nitrogen compounds are added to reduce heavies formation, then heavies formation rate decreases, but base-catalyzed aldol condensation is expected to increase heavies formation
Solution Approach 1:
The patent applies this principle by using organic nitrogen compounds (which normally would be expected to increase heavies formation through base-catalyzed aldol condensation) to actually reduce heavies formation rate. The unexpected beneficial effect converts the presumed harmful action into a useful one, reducing heavies by up to 50% while suppressing aldol condensation side reactions.
2Quantity of substance
If liquid purge is used to remove heavies, then heavies concentration is controlled, but precious metal recovery costs and product loss increase
Solution Approach 1:
The patent applies this principle by changing the chemical environment parameters through the addition of organic nitrogen compounds. This modification of the reaction system's chemical parameters suppresses the formation of heavies at the source, allowing the system to maintain low heavies concentration without resorting to liquid purge operations that would cause precious metal and product loss.
3Productivity
If reactor temperature is increased to maintain aldehyde production rate, then productivity increases, but heavies formation increases
Solution Approach 1:
The patent applies this principle by introducing organic nitrogen compounds as intermediary substances that mediate between the conflicting requirements of high temperature operation and low heavies formation. These compounds act as a chemical mediator that suppresses the thermal degradation pathways leading to heavies formation, allowing the system to operate at higher temperatures for increased productivity without the usual penalty of increased heavies formation.
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
The use of organic nitrogen compounds significantly reduces the rate of heavies formation by up to 50% and decreases rhodium loss by over 90%, thereby improving process efficiency and extending catalyst life, as demonstrated through gas chromatography and atomic absorption analysis.
Implementation Method 1
the addition of a certain class of organic nitrogen compound will slow the rate of aldehyde-derived heavy byproducts in an aldehyde solution
Implementation Method 2
as demonstrated through gas chromatography and atomic absorption analysis
Implementation Method 3
as demonstrated through gas chromatography and atomic absorption analysis
Data Source
AI summary
Some embodiments of the present invention relate to processes for reducing heavies formation in a solution comprising one or more aldehydes, such as a reaction fluid in a hydroformylation process. In some embodiments, the process comprises providing 0.1 to 5 wt. percent of an organic nitrogen compound based on the total weight of the aldehyde solution, the organic nitrogen compound comprising: wherein each of R1-R5 are independently hydrogen, an alkyl, or an aryl radical.