Organotin Catalyst Recovery via Extraction and Distillation
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Solution Overview
Problem
Existing methods for recycling organotin catalysts used in amino alkyl (meth)acrylate synthesis are inefficient, leading to catalyst deactivation, increased impurities, and environmental waste, which negatively impact the quality and performance of the resulting polymers.
Innovation Solution
A method involving liquid-liquid extraction and distillation processes using specific solvents and conditions to recover and purify the organotin catalysts, including steps with polar solvents, organic solvents, and controlled temperatures and pressures to enhance catalyst recovery and reduce impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organotin catalyst is reused in multiple synthesis cycles, then cost is reduced and environmental impact is minimized, but catalyst deactivation occurs and impurities increase
Solution Approach 1:
The patent applies parameter changes by systematically varying extraction conditions including solvent type (organic solvents like hexane, heptane, toluene), solvent-to-feed ratio (1:1 to 5:1), temperature (20-80°C), and number of extraction stages to optimize catalyst recovery. These parameter adjustments enable maintaining catalyst activity across multiple recycling cycles while removing deactivation-causing impurities
Solution Approach 2:
The core invention employs liquid-liquid extraction to separate and remove impurities from the organotin catalyst. The process extracts Michael adducts and other contaminants into an organic phase while retaining the active catalyst in the aqueous phase, enabling catalyst regeneration and extended recycling cycles without significant activity loss
2Ease of manufacture
If traditional extraction methods are used to recover catalyst, then process is simple, but catalyst recovery efficiency is low and impurities remain
Solution Approach 1:
The patent segments the catalyst recovery process into multiple sequential extraction stages, where each stage removes specific impurity fractions. This multi-stage approach (typically 2-4 stages) progressively purifies the catalyst while maintaining operational simplicity, achieving high purity without requiring complex equipment
Solution Approach 2:
The patent introduces organic extraction solvents as intermediary substances to facilitate selective impurity removal. These solvents act as mediators that preferentially solubilize Michael adducts and other contaminants while leaving the organotin catalyst unaffected, enabling efficient separation through simple phase decantation
3Loss of substance
If strong acid is added to recover catalyst as in JP2008-231003, then catalyst can be recovered, but additional chemicals and waste streams are generated
Solution Approach 1:
The patent employs inexpensive, readily available organic solvents (hexane, heptane, toluene, ethyl acetate) as extraction media. These solvents are used in single-pass extraction processes and can be easily disposed of or recovered through simple distillation, avoiding the need for expensive acid treatment and complex waste neutralization procedures
Solution Approach 2:
The patent converts the harmful effect of accumulated impurities (Michael adducts) into a beneficial separation process. By exploiting the different solubility characteristics of impurities versus catalyst in organic-aqueous systems, the method transforms the contamination problem into an efficient extraction-based purification approach that eliminates waste generation
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 method improves catalyst recovery, reduces environmental impact, and enhances the quality and performance of subsequent amino alkyl (meth)acrylate synthesis, minimizing greenhouse gas emissions and waste generation.
Implementation Method 1
liquid-liquid extraction LLE 1 of this mixture using the organic extraction solvent ES 1 to obtain an organic solution OS 1 and an aqueous solution AS 1
Implementation Method 2
Distillation D 1, at a temperature T 1 and at a pressure P 1, of the organic solution OS 1 to obtain an organic solution OS 1' and an organic distillate OD 1
Implementation Method 3
Distillation D 2, at a temperature T 2 and at a pressure P 2, of the organic solution OS 1, to obtain an organic solution OS 1'' and an organic distillate OD 2
Data Source
Figure 1~2
Figure 3
AI summary
An organotin catalysts recycling method comprises the following successive steps: 1) preparation of a mixture comprising (i) a polar solvent selected from water, at least one C1-C12 alcohol, and a mixture of water and at least one C1-C12 alcohol (ii) an organotin catalyst residue solution S1 resulting from the synthesis of an amino alkyl (meth) acrylate compound and (iii) at least one organic extraction solvent ES1, liquid-liquid extraction LLE1 of this mixture using the organic extraction solvent ES1 to obtain an organic solution OS1 and an aqueous solution AS1; 2) distillation D1, at a temperature T1 and at a pressure P1, of the organic solution OS1 to obtain an organic solution OS1' and an organic distillate OD1;3) distillation D2, at a temperature T2 and at a pressure P2, of the organic solution OS1' to obtain an organic solution OS1" and an organic distillate OD2.