Azide Compound Production via Flow Reactor Safety

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Solution Overview

Problem

Existing methods for producing azide compounds, such as alkyl azides, are hazardous due to their explosive and toxic nature, making them difficult to handle and industrialize safely, particularly when using alkylating agents like methyl azide.

Innovation Solution

A method involving a flow reactor to react sodium azide with an alkylating agent in a controlled environment, using a solvent like toluene and a base, to produce an azide compound represented by general formula (I) efficiently and safely, allowing for the recovery of the azide compound in a solution state, thereby reducing the risk of explosion and toxicity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If alkyl azide is synthesized by alkylating sodium azide with an alkylating agent, then the desired azide compound is produced, but the process becomes hazardous due to the explosive and toxic nature of the alkyl azide product

Engineering Contradiction:

Improveproduction efficiency of azide compoundVSAvoidexplosion risk and toxicity

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical state parameter of the product from gas to solution by conducting the reaction in a solvent system. The alkyl azide is produced and maintained in a dissolved state rather than being isolated as a pure substance, which significantly reduces its explosiveness and handles the hazardous material more safely while maintaining production efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a solvent as an intermediary substance that mediates between the reactive alkylating agent and sodium azide. The solvent not only facilitates the reaction but also stabilizes the hazardous alkyl azide product by keeping it in solution, thereby reducing its harmful effects during the production process

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If methyl isocyanide is used as raw material to produce azide compound, then the synthesis can be performed, but the process becomes difficult to industrialize due to explosion risk, toxicity, and extreme odor

Engineering Contradiction:

Improveindustrializability of synthesis processVSAvoidexplosion risk, toxicity, and odor

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent extracts or removes the problematic methyl isocyanide intermediate from the process by using an alternative synthetic route that starts with sodium azide. This eliminates the need to handle the extremely hazardous methyl isocyanide, making the process suitable for industrialization while still producing the desired alkyl azide compound

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of the conventional approach of using methyl isocyanide and then converting to azide, the patent inverts the sequence by starting with sodium azide and introducing the alkyl group. This reversal of the synthetic pathway eliminates the hazardous intermediate step while achieving the same final product

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If azide compound is produced in high concentration, then the production efficiency is improved, but the explosion risk increases significantly

Engineering Contradiction:

Improveproduction efficiency of azide compoundVSAvoidsafety of production process

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the concentration parameter by maintaining the azide compound in a diluted solution state throughout the process. Rather than producing high concentrations that would be efficient but dangerous, the system accepts lower concentrations in exchange for dramatically improved safety and reliability, making the process viable for industrial application

Inventive Principle:

Principle #35Parameter changes

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 enables the safe and efficient production of azide compounds, which can then be used to synthesize 1H-tetrazole derivatives, useful in agricultural and pharmaceutical applications, by maintaining the azide in a dissolved state and controlling reaction conditions to prevent decomposition.

Implementation Method 1

reacting an alkylating agent with sodium azide in a flow reactor to produce an azide compound

Methodology Applied

Scientific EffectNucleophilic substitution: Chemical Bonding

Implementation Method 2

the reaction is carried out at a reaction temperature ranging from 35°C to 80°C

Methodology Applied

Scientific EffectThermal control: Heating

Implementation Method 3

the solvent of the solution containing the alkylating agent is an organic solvent capable of dissolving the azide compound and capable of undergoing phase separation with water

Methodology Applied

Scientific EffectSolvation: Solvation

Data Source

PatentEP2860173B1Method for producing azide compound, and method for producing 1h-tetrazole derivative

Publication Date: 2021.05.05 NIPPON SODA CO LTD

AI summary

The present invention provides a method for producing an azide compound that includes reacting an alkylating agent or silylating agent with an azide represented by the following general formula (II) (wherein, M represents an alkaline metal atom or alkaline earth metal atom and m represents 1 or 2) in a flow reactor to produce an azide compound represented by the following general formula (I) (wherein, Y represents an alkyl group, arylalkyl group, substituted silyl group or substituted silylalkyl group) in the state of a solution. M(N3)m (II) Y-N3 (I)