Acid-Conditioned Catalyst for Selective Glycol Production
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Solution Overview
Problem
Current processes for producing ethylene and propylene glycols from carbohydrate feedstocks face challenges in achieving high yields, selectivity, and catalyst stability, leading to inefficient energy use and complex equipment requirements.
Innovation Solution
A method involving a bi-functional catalyst system, including an acid-conditioned heterogeneous hydrogenation catalyst and a soluble retro-Aldol catalyst, is used to convert carbohydrate feeds into ethylene glycol, with a pH range of 2-7 and specific organic acids like lactic acid for catalyst conditioning, allowing for selective formation and high yields of ethylene glycol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used in glycol production from carbohydrate feedstocks, then the process can proceed, but catalyst stability and activity are poor leading to low yields and short catalyst lifetime
Solution Approach 1:
The catalyst undergoes preliminary acid treatment conditioning before the main glycol production reaction. This pre-treatment modifies the catalyst surface properties and creates active sites that enhance both the initial activity and long-term stability during the reaction process
Solution Approach 2:
The invention changes the chemical parameters of the catalyst through acid treatment, transforming it from a conventional catalyst to an acid-conditioned catalyst with improved performance characteristics. This parameter modification enables the catalyst to maintain stable activity over extended periods while achieving high glycol yields
2Manufacturing precision
If conventional catalysts are used, then the process is simpler, but selectivity for ethylene glycol over other glycols is poor
Solution Approach 1:
The acid treatment is performed as a preliminary step before the main reaction, modifying the catalyst to achieve high ethylene glycol selectivity. This pre-conditioning enables the catalyst to selectively promote the desired reaction pathway while suppressing side reactions forming other glycols
Solution Approach 2:
The acid treatment changes the chemical parameters of the catalyst surface, creating specific active sites that favor ethylene glycol formation. This parameter modification achieves high manufacturing precision for ethylene glycol selectivity without requiring complex downstream separation equipment
3Productivity
If high-concentration sugar solution is used as feed, then process efficiency improves, but catalyst instability increases leading to rapid deactivation
Solution Approach 1:
The catalyst is pre-conditioned with acid treatment to build resistance against deactivation by high-concentration sugar feeds. This preliminary action protects the catalyst structure and maintains active sites even when exposed to challenging feed conditions
Solution Approach 2:
The acid treatment provides a protective effect that cushions the catalyst against rapid deactivation by high-concentration sugar solutions. This pre-established protection enables the catalyst to maintain stable activity over extended periods even with efficient high-concentration feeds
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 method achieves improved catalyst performance, selective formation of ethylene glycol over other glycols, and maintains stable catalyst activity for extended periods, enhancing the overall economic viability of the glycol production process.
Implementation Method 1
conditioning a heterogeneous hydrogenation catalyst by treatment with a protic acid resulting in an acid-conditioned heterogeneous hydrogenation catalyst. In a reactor under hydrogenation conditions, the carbohydrate feed is contacted with a bi-functional catalyst system comprising the acid-conditioned heterogeneous hydrogenation catalyst
Implementation Method 2
a soluble retro-Aldol catalyst, whereby the pH of the reaction is in the range of from 2-7. An intermediate product stream may be obtained from the reactor including ethylene glycol
Data Source
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AI summary
Implementations of the disclosed subject matter provide methods for producing ethylene glycol from a carbohydrate feed which may include conditioning a heterogeneous hydrogenation catalyst by treatment with a protic acid resulting in an acid-conditioned heterogeneous hydrogenation catalyst. Next, in a reactor under hydrogenation conditions, the carbohydrate feed may be contacted with a bi-functional catalyst system comprising the acid-conditioned heterogeneous hydrogenation catalyst, and a soluble retro-Aldol catalyst. An intermediate product stream may be obtained from the reactor including ethylene glycol.