Recovering Dialkyltin Dialkoxide from Decomposed Catalyst

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Solution Overview

Problem

The existing methods for producing dialkyltin dialkoxide result in a low yield due to thermally decomposed matter, specifically a high-boiling-point tin component of unidentifiable structure, which reduces reaction activity and contaminates products in carbonate synthesis, and current separation methods fail to efficiently recover the active component from alkyltin alkoxide catalyst compositions.

Innovation Solution

Reacting an undistillable alkyltin alkoxide catalyst composition containing a high-boiling deactivated component and an active component with an alcohol and/or carbonate, followed by distillation to separate and recover dialkyltin dialkoxide, utilizing the difference in boiling points and chemical shifts to isolate the active component.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If dialkyltin oxide and alcohol are subjected to dehydration reaction at high temperature to obtain dialkyltin dialkoxide, then the dialkyltin dialkoxide can be produced, but thermally decomposed matter is generated which reduces reaction activity and contaminates products

Engineering Contradiction:

Improvedialkyltin dialkoxide productionVSAvoidthermally decomposed matter

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the reaction system by introducing a catalyst and modifying reaction conditions to achieve dehydration at lower temperatures, thereby preventing thermal decomposition of the dialkyltin compound while maintaining production efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses an intermediary catalyst to facilitate the dehydration reaction between dialkyltin oxide and alcohol, enabling the reaction to proceed under milder conditions that avoid formation of thermally decomposed matter

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If conventional separation methods are used to remove thermally decomposed matter, then some separation is achieved, but the active component recovery yield remains low

Engineering Contradiction:

Improveseparation efficiencyVSAvoidactive component recovery yield

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent replaces mechanical separation methods with a chemical approach using catalysts and selective reactions to differentiate between active and deactivated components, enabling more precise separation with higher recovery yields

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent applies local quality by using selective catalysts that interact differently with active versus deactivated components, allowing targeted separation based on the local chemical properties of each component type

Inventive Principle:

Principle #3Local quality

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 efficiently separates and recovers dialkyltin dialkoxide from alkyltin alkoxide catalyst compositions, enhancing the recovery yield and reducing contamination, thereby improving the efficiency and purity of carbonate synthesis.

Implementation Method 1

a dialkyltin oxide and an alcohol are subjected to a dehydration reaction

Methodology Applied

Scientific EffectDehydration reaction:

Implementation Method 2

production is carried out while withdrawing water out of the system from out of the dehydration reaction products, but this is an energetically unfavorable reaction, and hence the dialkyltin dialkoxide is obtained through prolonged reaction at a high temperature

Methodology Applied

Scientific EffectThermal heating: Heating

Implementation Method 3

at such a high temperature, a dialkyltin compound is readily thermally decomposed into a trialkyltin compound

Methodology Applied

Scientific EffectThermal decomposition: Thermolysis

Implementation Method 4

excess alcohol is removed from the reaction liquid, whereby a reaction liquid containing the dialkyltin dialkoxide is obtained

Methodology Applied

Scientific EffectDistillation: Distillation

Data Source

PatentUS7842828B2Method for separating out and recovering dialkyltin dialkoxide

Publication Date: 2010.11.30 ASAHI KASEI KOGYO KABUSHIKI KAISHA

AI summary

For an alkyltin alkoxide catalyst composition used in carbonate production, there is a problem that the alkyltin alkoxide catalyst composition is thermally decomposed by being heated in the production process, changing into an undistillable alkyltin alkoxide catalyst composition containing a high boiling deactivated component and an active component. The present invention provides a method for separating out and recovering the active component from the alkyltin alkoxide catalyst composition as a useful dialkyltin dialkoxide. According to the present invention, there is disclosed a method in which such an undistillable alkyltin alkoxide catalyst composition containing a high boiling deactivated component and an active component is reacted with an alcohol and/or a carbonate, so as to obtain a reaction liquid containing a product originating from the active component, and then the reaction liquid is subjected to distillation, so as to separate out and recover a dialkyltin dialkoxide from the product originating from the active component.