Zeolite-Catalyzed Conversion of Carbohydrates to Lactic Acid Esters
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Solution Overview
Problem
The industrial production of lactic acid through microbial fermentation requires neutralization with a stoichiometric base and is energy intensive, and existing methods for catalytic conversion of carbohydrates to lactic acid are not as efficient in terms of activity and selectivity.
Innovation Solution
The use of solid Lewis acidic zeolites, such as Sn-Beta, to catalyze the conversion of glucose, fructose, sucrose, xylose, or glycolaldehyde into lactic acid and 2-hydroxy-3-butenoic acid or their esters, with zeotype materials like Sn, Pb, Ge, Ti, or Hf incorporated in the framework, and mesoporous amorphous materials like MCM-41 or SBA-15, in the presence of solvents like methanol or ethanol, at temperatures between 50-300°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microbial fermentation is used for industrial production of lactic acid, then lactic acid can be produced from glucose and sucrose, but base neutralization and energy intensive work-up are required
Solution Approach 1:
The patent replaces the microbial fermentation process (biological system) with a catalytic conversion process using solid Lewis acidic zeolites (chemical system). This substitution eliminates the need for base neutralization and energy intensive work-up procedures while maintaining lactic acid production capability from carbohydrates
Solution Approach 2:
The patent changes the reaction conditions by using solid Lewis acidic catalysts (zeolites with tetravalent metals) instead of microbial fermentation. This parameter change in the catalytic system allows direct conversion of carbohydrates to lactic acid and esters without requiring base neutralization, thereby reducing energy consumption
2Productivity
If conventional catalytic conversion methods are used, then carbohydrates can be converted to lactic acid, but activity and selectivity are insufficient
Solution Approach 1:
The patent employs solid Lewis acidic zeolites with porous structures (BEA, MFI, MEL, MTW, MOR, LTL, or FAU structure types) as catalysts. The porous framework provides high surface area and specific active sites that enhance both the activity and selectivity for converting carbohydrates to lactic acid and 2-hydroxy-3-butenoic acid, overcoming the limitations of conventional catalytic methods
Solution Approach 2:
The patent uses composite catalyst systems combining zeolite framework structures with tetravalent metal ions (Sn, Pb, Ge, Ti, Zr, or Hf) incorporated into the framework. This composite approach creates synergistic effects that significantly improve both conversion activity and selectivity compared to conventional single-component catalysts
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 achieves high activity and selectivity for producing lactic acid and 2-hydroxy-3-butenoic acid or their esters, reducing the need for base neutralization and energy input, as demonstrated by examples showing significant yields of methyl, ethyl, and higher esters of these acids.
Implementation Method 1
conversion of carbohydrates and carbohydrate like material... by catalytic conversion... in presence of a solid Lewis acidic zeolite
Implementation Method 2
Part A: hydrolysis of sucrose and fragmentation to form triose sugars (dihydroxyacetone and glyceraldehyde)
Implementation Method 3
Part B: dehydration of the triose sugars to form methyl glyoxal
Implementation Method 4
Part C: addition of methanol to methyl glyoxal to form a hemiacetal followed by redox isomerisation of the hemiacetal to produce methyl lactate
Data Source
AI summary
A process for the production of lactic acid and 2-hydroxy-3-butenoic acid or esters thereof by conversion of glucose, fructose, sucrose, xylose and glycolaldehyde dissolved in a solvent in presence of a solid Lewis acidic catalyst.