Glycerin Dehydration Catalyst for Acrolein Yield Stability
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Solution Overview
Problem
Existing processes for producing acrolein from glycerin using catalysts experience a significant decrease in yield over time, which hampers the cost-effective production of acrolein derivatives like acrylic acid, 1,3-propanediol, and polyacrylates.
Innovation Solution
A process involving the dehydration of glycerin in the presence of a catalyst with specific metal phosphates, such as aluminum, zirconium, or alkali metal phosphates, where the M/P ratio is controlled to suppress the decrease in acrolein yield, utilizing a catalyst with a crystal structure to prevent carbonaceous deposition and maintain catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts (pumice supporting lithium phosphate or copper phosphate, silica or alumina supporting lithium phosphate, carrier supporting phosphoric acid) are used for acrolein production, then the dehydration reaction of glycerin can proceed, but the yield of acrolein decreases significantly with time
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by specifying precise metal phosphate compositions with controlled M/P ratios. This resolves the contradiction by creating a catalyst formulation that maintains high acrolein yield while preventing the yield decrease that occurs with conventional catalysts over time.
Solution Approach 2:
The patent employs composite catalyst materials combining multiple metal phosphates (e.g., alkali metal phosphate + alkali earth metal phosphate + aluminum phosphate) with specific M/P ratios. This composite approach resolves the technical contradiction by creating a synergistic catalyst system that simultaneously achieves high productivity and long-term stability without significant yield decrease.
2Duration of action of stationary object
If catalysts are used continuously for acrolein production, then production can be maintained, but carbonaceous deposition occurs on the catalyst surface causing deactivation
Solution Approach 1:
The patent converts the harmful carbonaceous deposition into a beneficial outcome by designing a catalyst surface that promotes complete combustion of carbon deposits. The specific metal phosphate composition and M/P ratio control create conditions where carbon deposition is minimized and any deposited carbon is converted to CO2, thereby extending catalyst lifespan while maintaining continuous production capability.
Solution Approach 2:
The patent changes the catalyst surface chemical properties by controlling metal phosphate composition and M/P ratios, which alters the surface reactivity toward carbonaceous materials. This parameter optimization prevents carbon deposition accumulation and extends catalyst operational duration without significant deactivation.
3Ease of manufacture
If glycerin dehydration is performed to produce acrolein, then acrolein and its derivatives can be produced, but the process becomes less economical due to yield decrease over time
Solution Approach 1:
The patent optimizes the catalyst composition parameters (metal phosphate types and M/P ratios) to achieve both high acrolein yield and cost-effectiveness. By controlling these parameters, the process maintains high productivity while reducing the frequency of catalyst replacement and regeneration, thereby improving overall manufacturing economics.
Solution Approach 2:
The patent enables continuous operation with stable acrolein yield by designing a catalyst that resists deactivation. This continuity of useful action improves ease of manufacture by eliminating frequent interruptions for catalyst maintenance, making the production process more economical despite the inherent yield challenges of continuous operation.
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 process effectively stabilizes the acrolein yield over time, enhancing the production efficiency and extending the catalyst's lifespan by preventing deactivation due to carbonaceous deposition, thus ensuring continuous and economical production of acrolein and its derivatives.
Implementation Method 1
a process for producing acrolein by dehydrating glycerin in the presence of a catalyst having a metal phosphate
Implementation Method 2
it is desired to suppress a decrease in the yield of acrolein, even when acrolein is produced by the continued use of a catalyst
Data Source
AI summary
There is provided a process for producing acrolein from glycerin, exhibiting a suppressed decrease in the yield of acrolein with time. In the process for producing acrolein by dehydrating glycerin in the presence of a catalyst containing a metal phosphate, one, or two or more, metal phosphates are used, which are selected from aluminum salts, zirconium salts, manganese salts, alkali metal salts (provided that the alkali metal is sodium, potassium, or cesium, and the ratio between the mole number (M) of the alkali metal and the mole number (P) of phosphoric acid (i.e., M/P ratio) in the metal phosphate is 2.0 or lower), alkali earth metal salts (provided that the ratio between the mole number (M) of the alkali earth metal and the mole number (P) of phosphoric acid (i.e., M/P ratio) in the metal phosphate is 1.0 or lower), and the like.