Betaine Synthesis via Inverted Addition Sequence
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Solution Overview
Problem
Current chemical processes for producing L-carnitine result in low yields and require a separate hydrolysis step, leading to the formation of salt byproducts that need disposal.
Innovation Solution
The process involves adding an ω-halocarboxylate to an aqueous solution of a tertiary amine and a base, rather than adding the amine and base to the ω-halocarboxylate, at low temperatures, which improves yield and purity by minimizing side reactions and eliminating the need for hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amine and base are added to ω-halocarboxylate, then reaction proceeds, but yield is low and side reactions occur
Solution Approach 1:
The patent inverts the conventional addition sequence by adding the ω-halocarboxylate to the amine-base solution rather than adding amine and base to the ω-halocarboxylate. This reversal prevents side reactions and eliminates the need for hydrolysis, achieving both high yield (89%) and high purity product directly
2Productivity
If conventional process is used, then reaction completes, but separate hydrolysis step is required
Solution Approach 1:
The patent merges the substitution reaction and hydrolysis steps into a single operation. The aqueous base serves dual functions: as a reactant for substitution and as the hydrolysis agent, eliminating the need for a separate hydrolysis step and simplifying the overall process
3Quantity of substance
If conventional process is used, then product is formed, but salt byproducts are generated
Solution Approach 1:
The patent converts the potentially harmful excess base from a source of salt byproducts into a beneficial dual-purpose reagent. The base both drives the substitution reaction and performs in-situ hydrolysis, eliminating salt waste while maintaining high product formation
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 significantly increases the yield and purity of L-carnitine production, reducing salt byproducts and allowing for efficient isolation and recycling of reactants, with yields ranging from 76% to 89% in various examples.
Implementation Method 1
the yield and purity of the desired product can be significantly improved if the ω-halocarboxylate is added to the solution of the amine and the base
Implementation Method 2
reacted with a tertiary amine of formula R3N (III), wherein R is C1-4 alkyl, by adding the ω-halocarboxylate (II) to an aqueous solution containing the tertiary amine (III) and a base selected from alkali hydroxides and alkaline earth hydroxides
Data Source
AI summary
Betaines of formula R3N+-Q-COO− (I), wherein R is C1-4 alkyl and Q is C1-4 alkanediyl, optionally substituted with hydroxy, are prepared in one step by adding an ω-halocarboxylate of formula X-Q-COOR′ (II), wherein Q is as defined above, R′ is Cl1-4 alkyl and X is chlorine, bromine or iodine, to an aqueous solution containing a tertiary amine of formula R3N (III), Wherein R is as defined above and a base selected from alkali hydroxides and alkaline earth hydroxides. The process is particularly suited to the production of L-carnitine.