Tertiary Alkyl Amine Synthesis via Cyanide Recycling
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Solution Overview
Problem
Existing methods for producing tertiary alkyl primary amines generate cyanide waste products, which require expensive treatment for disposal, and lack efficient recycling of hydrogen cyanide.
Innovation Solution
A method involving the steps of contacting hydrogen cyanide, an acid, and a substrate capable of generating a carbonium ion, followed by hydrogen cyanide removal to low ppm levels using a stripper column, and recycling it, with subsequent neutralization using alkali metal hydroxide to produce the amine, minimizing cyanide waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing methods for producing tertiary alkyl primary amines are used, then the amine production is achieved, but cyanide waste products are generated requiring expensive treatment for disposal
Solution Approach 1:
The patent implements a recycling system where hydrogen cyanide is removed from the reaction mixture via a stripper column and recovered for reuse in the carbonylation reactor. This eliminates the need to discard cyanide as waste and prevents the formation of cyanide-containing waste products, directly resolving the contradiction between ease of manufacture and harmful waste generation
Solution Approach 2:
The patent establishes a feedback loop where the stripper column continuously monitors and removes hydrogen cyanide from the reaction mixture, and the recovered cyanide is fed back to the carbonylation reactor. This closed-loop system ensures cyanide is maintained at optimal levels for production while preventing waste accumulation, resolving the contradiction between manufacturing efficiency and waste reduction
2Device complexity
If hydrogen cyanide is not recycled, then the process is simpler, but cyanide waste accumulates requiring expensive treatment
Solution Approach 1:
The patent implements a recycling system where hydrogen cyanide is removed from the reaction mixture via a stripper column and recovered for reuse in the carbonylation reactor. This eliminates the need to discard cyanide as waste and prevents the formation of cyanide-containing waste products, directly resolving the contradiction between ease of manufacture and harmful waste generation
Solution Approach 2:
The patent establishes continuous operation where hydrogen cyanide is constantly stripped from the reaction mixture and continuously recycled back to the carbonylation reactor. This continuous recycling prevents substance loss and eliminates waste treatment requirements, resolving the contradiction between process simplicity and substance conservation
3Object-affected harmful factors
If cyanide waste is treated for disposal, then environmental compliance is achieved, but production costs increase
Solution Approach 1:
The patent converts the potentially harmful cyanide waste product into a beneficial recycled reactant. By stripping hydrogen cyanide from the reaction mixture and recycling it to the carbonylation reactor, the system transforms waste into a valuable resource, eliminating disposal costs and converting an environmental liability into an economic benefit, thus resolving the contradiction between environmental compliance and production cost
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
Significantly reduces cyanide waste and allows for its recycling, thereby lowering production costs and environmental impact while maintaining high efficiency in amine production.
Implementation Method 1
hydrogen cyanide is removed from the second reaction intermediate by a stripper column
Implementation Method 2
contacting hydrogen cyanide or a salt thereof, an acid, water and a substrate compound capable of generating a carbonium ion by reaction with the acid
Implementation Method 3
contacting the second reaction intermediate with an alkali metal hydroxide to form the amine
Data Source
AI summary
A method for producing an amine. The first step is contacting a cyanide, an acid, water and a substrate compound capable of generating a carbonium ion by reaction with the acid to generate a first reaction intermediate. The second step is contacting the first reaction intermediate with water to form a second reaction intermediate. The third step is removing cyanide present in the second reaction intermediate to a concentration less than 10 ppm. The fourth step is contacting the second reaction intermediate with an alkali metal hydroxide to form the amine