MMA Production via Methacrolein Oxidative Esterification

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Solution Overview

Problem

Current processes for producing methyl methacrylate (MMA) result in high energy requirements and yellow discoloration of polymer products due to byproducts like methacrylic acid and dimethoxyisobutene, which are difficult to remove efficiently, leading to reduced yield and increased disposal costs.

Innovation Solution

A novel process involving oxidative esterification of methacrolein with a heterogeneous noble metal catalyst at controlled water and pH levels, followed by aftertreatment in a reactor with adjusted pH and water content, effectively removing discoloring byproducts and reducing waste generation, allowing for the production of MMA with low yellowness index.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional oxidative esterification processes are used to produce MMA, then production efficiency is improved, but yellow discoloration of polymer products occurs due to byproducts like methacrylic acid and dimethoxyisobutene

Engineering Contradiction:

Improveproduction efficiencyVSAvoidyellow discoloration

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The invention performs preliminary removal of discoloring byproducts (methacrylic acid and dimethoxyisobutene) from the MMA production process through controlled oxidative esterification conditions and specific workup procedures, preventing their subsequent formation of harmful oligomers that cause yellow discoloration in polymer products

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes critical process parameters including maintaining water content between 0.1-10% by weight, controlling pH between 5-8 during oxidative esterification, and using specific temperature ranges (50-140°C in reactor III) to optimize byproduct removal and prevent discoloration while maintaining production efficiency

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If multiple distillation stages are used to remove byproducts, then purity of MMA is improved, but energy consumption increases significantly

Engineering Contradiction:

Improvepurity of MMAVSAvoidenergy consumption

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The invention extracts and removes discoloring byproducts (methacrylic acid and dimethoxyisobutene) through a simplified workup process involving controlled oxidative esterification conditions and a single distillation stage with specific feed positioning, eliminating the need for multiple energy-intensive distillation stages while maintaining MMA purity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention selectively removes and discards harmful byproducts (methacrylic acid and dimethoxyisobutene) through optimized reaction conditions and workup procedures, while recovering and recycling methanol from the distillation overhead back into the reactor, reducing both energy consumption and waste disposal requirements

Inventive Principle:

Principle #34Discarding and recovering

3Ease of manufacture

If byproducts are not removed efficiently, then production costs are reduced, but disposal costs and environmental impact increase

Engineering Contradiction:

Improveproduction costVSAvoiddisposal costs

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The invention converts the harmful byproducts (methacrylic acid and dimethoxyisobutene) into removable impurities through controlled oxidative esterification conditions, transforming them from problematic substances requiring expensive disposal into easily separable components that can be removed in the workup process, thereby reducing disposal costs and environmental impact

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 significantly reduces yellow discoloration and disposal costs, enhancing the yield of polymer resins by efficiently removing byproducts, resulting in MMA suitable for producing polymer resins with improved optical properties and reduced thermal instability.

Implementation Method 1

oxidative esterification of methacrolein with a heterogeneous noble metal catalyst

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

oxidative esterification of methacrolein

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

aftertreatment of the reactor output from reactor II in a reactor III

Methodology Applied

Scientific EffectPhase separation:

Data Source

PatentUS11780944B2Process for producing optical molding materials

Publication Date: 2023.10.10 ROHM GMBH

AI summary

A process can be used for producing optical molding materials on the basis of methyl methacrylate (MMA). The MMA produced by an optimized method and the molding materials feature in particular a very low yellowness index. This MMA has been produced by direct oxidative esterification of methacrolein. An optimized workup of the reactor output from the oxidative esterification of methacrolein can be used for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands are placed on plant apparatus configuration.