PHA Filtration via pH and Thermal Parameter Control
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Solution Overview
Problem
Existing methods for producing polyhydroxyalkanoates (PHAs) face challenges in efficient filtration due to low filtrate permeability and high leakage ratios, particularly when using filtration techniques that are not optimized for PHA particle sizes and aqueous suspensions.
Innovation Solution
A novel PHA production method involving a heating step to raise the temperature of an aqueous PHA suspension with specific additives to 60°C to 95°C, followed by a cooling step and a filtration step using a filter medium with controlled air permeability, to achieve enhanced filtrate permeability and reduced leakage ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional filtration methods are used for PHA separation, then the filtration process can be performed with simple equipment, but the filtrate permeability is low and the leakage ratio is high
Solution Approach 1:
The patent applies parameter changes by adjusting the pH of the aqueous PHA suspension to a specific range (2.5-5.5) and controlling the temperature during filtration. These parameter optimizations significantly improve filtrate permeability and reduce leakage ratio, resolving the contradiction between simple equipment operation and high filtration efficiency.
Solution Approach 2:
The patent introduces a filter aid as an intermediary substance to enhance the filtration process. This mediator improves the filtrate permeability and reduces leakage by modifying the suspension properties before filtration, enabling efficient separation without requiring complex filtration equipment.
2Manufacturing precision
If filtration is performed without pH adjustment and filter aid, then the process is simpler, but the leakage ratio increases and purification efficiency decreases
Solution Approach 1:
The patent optimizes the pH parameter to a specific range (2.5-5.5) to maximize purification efficiency. By controlling this critical parameter, the method achieves high purification efficiency with relatively simple process steps, resolving the contradiction between purification quality and process simplicity.
Solution Approach 2:
The patent performs preliminary actions by adjusting the pH and adding filter aid before the filtration step. These preparatory measures ensure optimal filtration conditions are established in advance, improving purification efficiency without requiring complex filtration equipment or procedures.
3Reliability
If high filtration efficiency is achieved through optimized parameters and filter aid, then the leakage ratio is reduced, but the process requires additional steps and parameter control
Solution Approach 1:
The patent establishes specific parameter ranges (pH 2.5-5.5, temperature control) that optimize filtration performance. By defining these clear parameter specifications, the method achieves reliable filtration results with straightforward operational procedures, balancing reliability and ease of operation.
Solution Approach 2:
The filter aid performs self-service by automatically improving the suspension's filterability and reducing leakage without requiring complex external controls. This self-enhancing property maintains high filtration performance while keeping the operational procedure simple and easy to execute.
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 method achieves a high filtration rate, reducing equipment costs and improving purification efficiency, while also minimizing energy requirements and environmental impact, thus making it suitable for industrial-scale PHA production.
Implementation Method 1
a heating step of heating an aqueous PHA suspension which has a pH of 2.5 to 5.5 and which contains at least one additive selected from the group consisting of a fatty acid amide and a fatty acid, the at least one additive having a melting point of not less than 60° C., such that the aqueous PHA suspension has a temperature of 60° C. to 95° C.
Implementation Method 2
a cooling step of cooling the aqueous PHA suspension obtained in the heating step such that the aqueous PHA suspension has a temperature not less than 5° C. lower than a temperature which the aqueous PHA suspension has after the heating
Implementation Method 3
a filtration step of subjecting, to dead-end filtration, the aqueous PHA suspension obtained in the cooling step, with use of a filter medium having an air permeability of 0.01 cc/cm2/sec to 5.0 cc/cm2/sec
Data Source
AI summary
An object is to provide a PHA production method which enables efficient filtration. A PHA production method is provided, the PHA production method including: a heating step of heating an aqueous PHA suspension containing a specific additive and having a pH of 2.5 to 5.5 such that the aqueous PHA suspension has a temperature of 60° C. to 95° C.; a cooling step of cooling the aqueous PHA suspension obtained in the heating step to a specific temperature; and a filtration step of subjecting, to dead-end filtration, the aqueous PHA suspension obtained in the cooling step, with use of a filter medium having an air permeability of 0.01 cc/cm2/sec to 5.0 cc/cm2/sec, so that the above problem is solved.