Solid Acid Catalyst Hydrolysis of Methyl Methoxyacetate
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Solution Overview
Problem
Current methods for producing glycolic acid and methyl glycolate face challenges such as pollution, high production costs, and low conversion efficiency due to the use of chloroacetic acid hydrolysis, formaldehyde carbonylation, and oxalate hydrogenation/hydrolysis methods, while the potential of methyl methoxyacetate from dimethoxymethane carbonylation has not been fully utilized.
Innovation Solution
A method involving the hydrolysis of methyl methoxyacetate and methoxyacetic acid using a solid acid catalyst, specifically an acidic molecular sieve, to efficiently convert dimethoxymethane into glycolic acid and methyl glycolate, leveraging the carbonylation reaction's low temperature and high atomic economy, and allowing for the reuse of methoxyacetic acid to reduce waste and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the chloroacetic acid hydrolysis method is used to prepare glycolic acid, then the production process is simple, but it causes heavy pollution and produces a large amount of waste salt
Solution Approach 1:
The patent replaces the harmful chloroacetic acid route with a green carbonylation process using dimethoxymethane and carbon monoxide. The solid acid catalyst enables hydrolysis without producing waste salt, converting an environmentally harmful process into a clean one while maintaining production efficiency
Solution Approach 2:
The patent changes the chemical parameters by using different raw materials (dimethoxymethane instead of chloroacetic acid) and different reaction conditions (solid acid catalyst at moderate temperatures). This parameter change eliminates the formation of harmful byproducts while achieving the desired glycolic acid production
2Quantity of substance
If the formaldehyde carbonylation method is used to prepare glycolic acid, then the raw materials are cheap and easily available, but the device is easily corroded and product purification is difficult
Solution Approach 1:
The patent uses a solid acid catalyst that can be easily replaced and does not require complex corrosion-resistant equipment. The catalyst itself is relatively inexpensive and the reaction conditions are mild enough to avoid severe设备 corrosion, eliminating the need for expensive specialized reactors
Solution Approach 2:
The patent changes the reaction parameters by using solid acid catalysts at moderate temperatures and pressures, which reduces equipment corrosion compared to the harsh conditions required by formaldehyde carbonylation. The product purification is simplified by the selective catalysis and easier separation of products
3Ease of manufacture
If the oxalate hydrogenation/hydrolysis method is used to prepare glycolic acid, then the production process can be implemented, but the catalyst has low conversion efficiency and poor stability
Solution Approach 1:
The patent extracts and eliminates the problematic hydrogenation step from the oxalate route. By directly carbonylating dimethoxymethane to form methyl methoxyacetate, then hydrolyzing it, the process removes the unstable hydrogenation catalyst and replaces it with a stable solid acid catalyst system that maintains high conversion efficiency
Solution Approach 2:
The patent changes the reaction pathway parameters by replacing the hydrogenation/hydrolysis sequence with a carbonylation/hydrolysis sequence. The solid acid catalyst operates at optimal temperatures and pressures that maximize conversion efficiency and stability, overcoming the limitations of the oxalate hydrogenation method
4Ease of manufacture
If methyl methoxyacetate from DMM carbonylation is not applied to prepare glycolic acid, then the DMM carbonylation process remains isolated, but the potential of methyl methoxyacetate is not fully utilized
Solution Approach 1:
The patent merges the DMM carbonylation process with the glycolic acid production process. Methyl methoxyacetate, which would otherwise be a dead-end product, is integrated into the glycolic acid synthesis pathway through solid acid-catalyzed hydrolysis. This combines two processes into a unified production route, eliminating material waste and creating economic value from the carbonylation intermediate
Solution Approach 2:
The patent makes methyl methoxyacetate serve multiple functions: it is both the product of DMM carbonylation and the precursor for glycolic acid production. The solid acid catalyst system enables this dual utility, allowing the same intermediate to fulfill both process roles and preventing material waste
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 provides an environmentally friendly and economical pathway for producing glycolic acid and methyl glycolate, suitable for continuous production in traditional reactors, with high selectivity and conversion rates, expanding the use of methyl methoxyacetate and methoxyacetic acid from the coal chemical industry.
Implementation Method 1
allowing raw materials including the methyl methoxyacetate, the methoxyacetic acid, and water to contact and react with a catalyst to produce the glycolic acid and the methyl glycolate, wherein the catalyst is a solid acid catalyst
Implementation Method 2
a method for preparing glycolic acid and methyl glycolate through hydrolysis of methyl methoxyacetate and methoxyacetic acid
Data Source
Figure 1
AI summary
The present application discloses a method for preparing glycolic acid and methyl glycolate through hydrolysis of methyl methoxyacetate and methoxyacetic acid. The method includes: allowing raw materials including methyl methoxyacetate, methoxyacetic acid, and water to contact and react with a catalyst to produce glycolic acid and methyl glycolate, where the catalyst is at least one selected from the group consisting of a solid acid catalyst, a liquid acid catalyst, a solid base catalyst, and a liquid base catalyst. The method for preparing glycolic acid and methyl glycolate in the present application can be implemented by a traditional fixed-bed reactor, tank reactor, or catalytic distillation reactor under an atmospheric pressure, which is very suitable for continuous production. When used in combination with methanol and formaldehyde condensation to prepare dimethoxymethane (DMM) and DMM carbonylation to prepare methyl methoxyacetate, the method in the present application can allow efficient, environmentally-friendly, and economical conversion of methanol (a platform chemical in the coal chemical industry) into glycolic acid and methyl glycolate.