Cefotiam Hydrochloride Purification via Acidic Salt Extraction
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Solution Overview
Problem
Current methods for purifying cefotiam hydrochloride result in low yield and purity, with residual solvents posing health risks and difficulties in separation, leading to reliance on imported crude drugs and inefficient production processes.
Innovation Solution
A three-step purification process involving dissolving cefotiam hydrochloride in water, treating it with an acidic salt like bisulfate, extracting with a water-immiscible solvent, and recrystallizing with a poor solvent like ethanol or acetone to achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional purification methods are used, then the process is simple, but the purity of cefotiam hydrochloride is low
Solution Approach 1:
The purification process is divided into multiple sequential steps: (1) treatment with acidic salt to remove basic impurities, (2) extraction with water-immiscible solvent to remove organic solvents and hydrophobic impurities, and (3) recrystallization to remove polymeric and colored impurities. This segmentation allows each step to target specific impurity types, achieving high purity (≥86%) while maintaining manageable process complexity.
Solution Approach 2:
The process utilizes changes in physical and chemical parameters at each stage: pH adjustment through acidic salt treatment, phase separation through solvent extraction, and solubility changes through recrystallization. These parameter changes enable selective removal of different impurity types, resolving the contradiction between purity improvement and process complexity.
2Productivity
If traditional preparation methods are used, then the process is straightforward, but the yield of cefotiam hydrochloride is low
Solution Approach 1:
The acidic salt treatment is performed as a preliminary step before extraction and recrystallization. This preliminary action removes basic impurities and prepares the solution for subsequent steps, preventing loss of cefotiam hydrochloride and improving overall yield while maintaining ease of manufacture through sequential simple operations.
Solution Approach 2:
Water-immiscible solvents are used to extract and remove organic solvents (dichloroethane, acetonitrile, dimethyl formamide) and hydrophobic impurities from the aqueous solution. This extraction step selectively removes harmful substances while retaining cefotiam hydrochloride in the aqueous phase, improving both yield and product safety.
3Manufacturing precision
If pH adjustment is used to improve purity, then purity increases, but new negative ion impurities are introduced
Solution Approach 1:
Acidic salts serve as an intermediary substance in the purification process. Instead of directly adjusting pH with strong acids or bases that would introduce harmful ions, the acidic salt mediates the removal of basic impurities through gentle acidification. This intermediary approach achieves purification without introducing new negative ion impurities, resolving the contradiction between purity improvement and harmful factor introduction.
4Reliability
If imported crude drugs are used, then product availability is ensured, but production efficiency and cost-effectiveness decrease
Solution Approach 1:
The patent enables domestic production of high-purity cefotiam hydrochloride through a self-contained purification process that uses readily available materials (acidic salts, water-immiscible solvents). This self-service approach eliminates dependence on imported crude drugs, improving both production efficiency and cost-effectiveness while ensuring product availability through local manufacturing capability.
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 process significantly improves the purity of cefotiam hydrochloride to at least 86%, reduces polymer and insoluble impurities, and enhances its stability and suitability for pharmaceutical formulations, addressing the challenges of low yield and purity in existing methods.
Implementation Method 1
treating it with an acidic salt like bisulfate... filtering the precipitate
Implementation Method 2
extracting with a water-immiscible solvent... separating the organic phase
Implementation Method 3
recrystallizing with a poor solvent like ethanol or acetone to achieve high purity
Data Source
AI summary
A method for treating cefotiam hydrochloride, comprises the following steps: step 1), dissolving the raw material cefotiam hydrochloride in water, treating it with an acidic salt, then cooling it, and filtering the precipitate to obtain an aqueous filtrate; step 2), adding a water-immiscible solvent to the above aqueous solution for extraction, and then separating the organic phase containing impurities to obtain an aqueous solution containing cefotiam hydrochloride; step 3) adding to the aqueous solution a poor solvent of cefotiam hydrochloride and controlling the temperature for recrystallization, washing the educed crystals by centrifugation, and drying them to obtain purified cefotiam hydrochloride. The cefotiam content of the refined cefotiam hydrochloride obtained by the method of the present invention is not less than 86%, the content of polymeric impurities is less than 0.3%, and the content of insoluble microparticles in the injection prepared therefrom is quite low.