Amino-functional organosilane halide removal via alkaline aqueous processing
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Solution Overview
Problem
Existing processes for producing amino-functional organosilanes result in significant effort to separate salt-like compounds, particularly ammonium halides and organic amine hydrohalides, with residual halide content remaining in the product, necessitating complex post-treatments to reduce halide content.
Innovation Solution
Aqueous processing involving the addition of a strongly alkaline solution to remove ammonium halides and organic amine hydrohalides from amino-functional organosilanes, allowing for separation of phases and recovery of the organic phase with reduced halide content, achieving halide levels below 100 ppm by weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation methods are used to remove ammonium halides and organic amine hydrohalides, then some salt separation is achieved, but the separation is incomplete and requires complex post-treatments with residual halide content remaining
Solution Approach 1:
The patent changes the chemical parameter by introducing a strongly alkaline aqueous solution (pH > 12, preferably pH 13-14) to convert the separation mechanism from physical filtration to chemical neutralization. This transforms ammonium halides and organic amine hydrohalides into water-soluble salts that partition into the aqueous phase, achieving complete separation in a single step without complex post-treatments
Solution Approach 2:
The patent introduces an intermediary substance - a strongly alkaline aqueous solution (sodium hydroxide or potassium hydroxide) - that mediates the separation process. This intermediary reacts with the halide salts to form water-soluble compounds, enabling efficient phase separation and achieving halide content below 100 ppm without requiring multiple processing stages
2Manufacturing precision
If multiple pressure stages are used to reduce salt caking, then some salt separation is improved, but the process becomes more complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by adding the strongly alkaline aqueous solution at an early stage in the process, before final product formulation. This pre-treatment converts all halide salts into water-soluble forms that can be completely removed in one aqueous wash, eliminating the need for subsequent complex multi-stage pressure processes and significantly reducing total processing time
3Manufacturing precision
If additional complex post-treatments are applied to reduce residual halide content, then halide content is further reduced, but the process effort and complexity increase significantly
Solution Approach 1:
The patent converts the harmful halide salts into beneficial water-soluble compounds by reacting them with strongly alkaline solution. The ammonium halides and organic amine hydrohalides are transformed into ammonium hydroxide and corresponding metal halides, which partition into the aqueous phase. This conversion turns the separation problem into a simple phase partitioning operation, achieving halide content below 100 ppm through a single straightforward aqueous wash rather than multiple complex treatments
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 simplifies and economizes the processing of amino-functional organosilanes, effectively reducing halide content to less than 100 ppm, improving product purity and reducing the need for complex post-treatments.
Implementation Method 1
ammonium halides and/or organic amine hydrohalides can be removed from aminosilanes with the addition of a strongly alkaline aqueous solution
Implementation Method 2
separating the aqueous phase from the organic phase
Data Source
AI summary
The invention relates to a method for the treatment of an amino functional organosilane containing ammonium halides and/or organic amine hydrohalides, wherein at least one non-polar organic solvent is optionally added to the amino functional organosilane containing the ammonium halides and/or organic amine hydrohalides, an aqueous lye is added. The mixture is reacted and subsequently the aqueous phase is separated from the organic phase, the solvent contained in the organic phase is removed from said phase and the residual organic phase is recovered.