L-Carnitine Production Salt Removal Process
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Solution Overview
Problem
The industrial production of L-carnitine is hindered by the formation of large amounts of inorganic salts, particularly ammonium chloride, which complicates the isolation and purification process, leading to reduced yields and environmental challenges associated with waste water disposal.
Innovation Solution
A process that eliminates the isolation and purification of L-carnitinenitrile chloride and reduces inorganic salt formation by precipitating and separating sodium chloride and ammonium chloride from the hydrolysis solution of L-carnitinenitrile chloride, using an organic base to neutralize the acid and facilitate phase separation, thereby reducing the molar amounts of inorganic salts in the L-carnitine solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If L-carnitinenitrile chloride is hydrolyzed in concentrated hydrochloric acid to yield L-carnitine, then L-carnitine production is achieved, but large amounts of inorganic salts (ammonium chloride) are formed complicating isolation and purification
Solution Approach 1:
The patent extracts and removes inorganic salts (ammonium chloride and sodium chloride) from the hydrolysis solution through selective precipitation. By adding sodium hydroxide to adjust pH to 7-8, the inorganic salts precipitate out and can be easily separated by filtration, leaving a purified L-carnitine solution without complex desalting steps
Solution Approach 2:
The patent changes the pH parameter of the hydrolysis solution from highly acidic (concentrated HCl) to neutral (pH 7-8) by controlled addition of sodium hydroxide. This parameter change triggers selective precipitation of inorganic salts while keeping L-carnitine in solution, simplifying the separation process
2Quantity of substance
If conventional hydrolysis methods are used, then L-carnitine is produced, but the process requires complex desalting steps increasing time and cost
Solution Approach 1:
The patent converts the harmful effect of inorganic salt formation into a beneficial separation mechanism. The inorganic salts that were previously problematic are now deliberately precipitated through pH adjustment, allowing easy removal by filtration and eliminating time-consuming desalting operations
3Productivity
If large amounts of inorganic salts are formed in the solution, then L-carnitine production is maintained, but environmental challenges arise from waste water disposal
Solution Approach 1:
The patent discards inorganic salts from the solution through selective precipitation and filtration, separating them from the L-carnitine product. The precipitated salts can be recovered and disposed of as solid waste rather than dissolving in wastewater, significantly reducing environmental pollution from salt-containing effluent
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 approach significantly reduces the amount of inorganic salts in the L-carnitine solution, simplifies the production process, and enhances productivity by eliminating the need for complex desalting steps, thereby addressing the environmental and economic challenges of salt disposal.
Implementation Method 1
the reaction mixture is concentrated and the pH is adjusted to 7-8 with sodium hydroxide
Implementation Method 2
ammonium chloride and sodium chloride are precipitated from the solution
Implementation Method 3
L-carnitinenitrile chloride is hydrolyzed in concentrated hydrochloric acid to yield L-carnitine and ammonium chloride
Implementation Method 4
the reaction mixture is concentrated
Data Source
AI summary
There is disclosed an improved process for the production of L-carnitine, comprising the steps of: (a) mixing an organic base with an acid solution comprised of L-carnitine to form an organic base salt of the acid, optionally in the presence of a solvent; (b) removing the organic base salt of step (a) to yield a solution comprised of L-carnitine; and (c) isolating the L-carnitine from the solution of step (b).