Isocyanatosilane Distillation Column Side Stream Purity
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Solution Overview
Problem
Current methods for producing isocyanatosilanes are inefficient, result in high manufacturing costs, and produce undesirable by-products such as isocyanurates and high molecular weight species, limiting their applications.
Innovation Solution
A method involving the thermal dissociation of carbamatoorganosilanes in a cracking device followed by distillation to produce isocyanatoorganosilane with high yield and purity, minimizing by-products through careful temperature and pressure control and distillation column design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal decomposition (cracking) of carbamatoorganosilanes is used to produce isocyanatosilanes, then the production process can be implemented, but the yield is inefficient and undesirable by-products such as allophanates and isocyanurate are formed
Solution Approach 1:
The patent applies parameter changes by optimizing the distillation conditions including temperature gradients, pressure control, and column design parameters to maximize isocyanatosilane yield while minimizing by-product formation. The specific parameters include controlling the distillation temperature range and pressure to favor the desired reaction pathway.
Solution Approach 2:
The patent segments the distillation process into multiple zones within the distillation column, with different temperature and pressure conditions in each zone. This allows for selective separation of isocyanatosilane from by-products and unreacted starting materials, improving overall yield and purity.
2Object-generated harmful factors
If multiple steps are used to prevent by-product formation, then by-products can be reduced, but the process complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the reaction and distillation steps into a continuous process where the distillation column directly processes the reaction mixture. This integration eliminates the need for separate purification steps while effectively removing by-products, thus reducing process complexity without sacrificing by-product control.
Solution Approach 2:
The distillation column is designed to perform multiple functions simultaneously: separating isocyanatosilane from by-products, removing unreacted starting materials, and controlling the reaction equilibrium. This multi-functionality reduces the need for additional specialized equipment and process steps.
3Object-generated harmful factors
If rapid removal of isocyanate and alcohol is implemented, then by-product formation is prevented, but additional equipment and process complexity are required
Solution Approach 1:
The patent combines the product removal function with the main distillation column, eliminating the need for separate rapid removal equipment. The column design ensures that isocyanate and alcohol are continuously separated and removed as they form, preventing reverse reaction and by-product formation without requiring additional specialized equipment.
4Manufacturing precision
If high purity isocyanatosilane is produced, then additional purification steps are eliminated, but the distillation process must be highly optimized
Solution Approach 1:
The patent achieves high purity through precise control of distillation parameters including temperature profiles, pressure conditions, and reflux ratios. By optimizing these parameters, the process delivers >90% pure isocyanatosilane directly from the distillation column, eliminating the need for additional purification steps.
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 achieves high yield (>60%) and purity (>90%) of isocyanatoorganosilane with significantly reduced by-products, eliminating the need for additional purification steps and avoiding reformation of starting carbamate.
Implementation Method 1
heating the carbamatoorganosilane to a temperature and pressure effective to thermally dissociate the carbamatoorganosilane to a reaction product mixture comprising isocyanatoorganosilane, alcohol
Implementation Method 2
separating the isocyanatoorganosilane from the reaction product mixture in the distillation column
Data Source
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AI summary
There is provided herein a method and an apparatus for producing an isocyanatoorganosilane which method includes feeding a carbamatoorganosilane to a cracking device where it is thermally dissociated into a reaction product mixture comprising isocyanatoorganosilane, alcohol, and heavies, followed by separating the mixture in a distillation column of two parts and collecting the isocyanatoorganosilane from the distillation column via a side stream having a predetermined location between the top and bottom parts of the column; and wherein the distillation column is configured to have a ratio of the length of the bottom part of the distillation column to the length of the top part of the distillation column which is effective to provide a side stream having a high purity and high weight percent of isocyanatoorganosilane.