Acetal Compound Purification via Buffer Extraction and Vacuum Distillation
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Solution Overview
Problem
Current methods for manufacturing acetal compounds with a hydroxyl group fail to prevent contamination by polyacetal, alcohol, and antioxidant impurities, making it difficult to produce highly pure polyalkylene glycol derivatives with an aldehyde group, which are essential for pharmaceutical applications.
Innovation Solution
A method involving the removal of antioxidants during distillation, followed by sequential steps of dissolving in a hydrocarbon solvent, buffering, extracting with chloroform or dichloromethane, and distilling under reduced pressure at 65°C or lower to minimize impurities, results in a highly pure acetal compound suitable for synthesizing polyalkylene glycol derivatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional distillation methods are used to manufacture acetal compounds, then production efficiency is maintained, but impurities such as polyacetal, alcohol, and antioxidant contaminate the product
Solution Approach 1:
The patent applies preliminary action by removing antioxidants before the distillation process. The method involves adding a buffer solution to neutralize antioxidants and performing extraction with organic solvents to remove impurities before the actual distillation of the acetal compound. This preliminary treatment prevents contamination during subsequent processing steps.
Solution Approach 2:
The patent uses buffer solutions and organic solvents as intermediaries to separate and remove impurities. The buffer solution acts as an intermediary to neutralize antioxidants, while organic solvents serve as intermediaries to extract polyacetal and alcohol impurities from the acetal compound before final distillation.
2Reliability
If high molecular weight polyalkylene glycol derivatives are used to improve blood circulation, then pharmaceutical performance is enhanced, but purification becomes more difficult due to decreased property difference from impurities
Solution Approach 1:
The patent performs preliminary purification of the acetal compound raw material before synthesizing polyalkylene glycol derivatives. By removing impurities such as polyacetal, alcohol, and antioxidants from the starting material, the method prevents formation of heterogeneous by-products during polymerization, making subsequent purification easier even for high molecular weight products.
Solution Approach 2:
The patent applies preliminary anti-action by preventing the formation of impure by-products through careful control of the synthesis conditions and use of high purity raw materials. The method includes removing antioxidants that could catalyze side reactions and using purified acetal compounds to prevent formation of heterogeneous polyalkylene glycol derivatives.
3Manufacturing precision
If multiple purification steps are added to remove impurities, then product purity is improved, but process complexity and time consumption increase
Solution Approach 1:
The patent merges multiple purification functions into a integrated process flow. The method combines buffer treatment, organic solvent extraction, and distillation into a sequential process where each step builds on the previous one, achieving high purity without requiring separate complex purification units.
Solution Approach 2:
The patent uses parameter changes to optimize the purification process. By controlling pH through buffer addition, adjusting solvent ratios for extraction, and optimizing distillation temperature and pressure, the method achieves high purity efficiently without requiring excessive process steps.
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 effectively reduces impurities such as polyacetal, alcohol, and antioxidant content, enabling the production of highly pure polyalkylene glycol derivatives with enhanced pharmaceutical performance and homogeneity.
Implementation Method 1
a step of dissolving the acetal compound in a solvent made from a hydrocarbon having 5 to 8 carbon atoms to obtain a solution
Implementation Method 2
a step of adding a buffer to the solution to extract the acetal compound into the buffer
Implementation Method 3
a step of adding at least one extracting solvent selected from the group consisting of chloroform and dichloromethane to the buffer to extract the acetal compound into the extracting solvent
Implementation Method 4
a step of distilling the extracting solution at 65°C or lower under a reduced pressure of 0.3 kPa or lower
Data Source
AI summary
The present invention provides a method for manufacturing an acetal compound having a hydroxyl group in the molecule, which is a raw material for a polyalkylene glycol derivative having an aldehyde group to be used in pharmaceutical uses, in high purity. An acetal compound represented by the formula [1] is manufactured by performing the steps (A) to (D): wherein n is 0 or 1 provided that R1 groups may be bonded or may not be bonded to each other when n is 0; R1 is an alkyl group having 1 or 2 carbon atoms or an alkylene group having 1 or 2 carbon atoms and the R1 groups may be same or different from each other; and R2 is an alkylene group having 1 or 6 carbon atoms, (A): the acetal compound represented by the formula [1] is dissolved in a solvent made from a hydrocarbon having 5 to 8 carbon atoms in an amount 0.1 mass time or more the amount of the formula [1] to obtain a solution thereof; (B): a buffer of pH 6 to 10 is added in an amount 0.5 mass time or more the amount of the formula [1] to the solution obtained in (A) to extract the acetal compound of the formula [1] into the buffer; (C) : at least one extracting solvent selected from the group consisting of chloroform and dichloromethane is added in an amount 0.5 mass time or more the amount of the acetal compound of the formula [1] to the buffer into which the acetal compound has been extracted, thereby extracting the acetal compound of the formula [1] into the extracting solvent to obtain an extraction solution; and (D): the extraction solution obtained in (C) is distilled at 65°C or lower under a reduced pressure of 0.3 kPa or lower.