Hemicellulose Isolation via pH-Adjusted Ultrafiltration
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Solution Overview
Problem
Conventional processes for isolating hemicelluloses from biomass pulping process waters and spent liquors face low throughput and fouling issues in ultrafiltration, limiting industrial application due to low solids concentration and equipment requirements.
Innovation Solution
Adjusting pH values at multiple stages to optimize separation and purification, allowing for high flux flow throughput and reducing fouling, enabling effective separation of hemicelluloses while preventing sodium ion binding, thereby achieving higher product concentrations and reducing equipment needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultrafiltration is used for concentration of effluent, then hemicelluloses can be separated, but throughput is very low and fouling occurs
Solution Approach 1:
The patent applies preliminary action by adjusting the pH of the effluent to 8-11 before ultrafiltration to prevent fouling. This pre-treatment step modifies the chemical properties of the effluent to reduce membrane fouling during subsequent concentration, thereby maintaining high throughput while ensuring reliable operation.
Solution Approach 2:
The patent employs parameter changes by adjusting pH as a key parameter to optimize ultrafiltration performance. By changing the pH parameter to 8-11, the process achieves both high throughput and reduced fouling, resolving the contradiction between productivity and reliability.
2Productivity
If ultrafiltration is used for concentration, then hemicelluloses can be separated, but solids content is low (1-3%)
Solution Approach 1:
The patent uses parameter changes by adjusting pH to 8-11 to enhance the concentration capability of ultrafiltration. This parameter optimization allows the system to achieve both high concentration rates and higher solids content (15-30%), simultaneously improving productivity and the quantity of concentrated product.
3Productivity
If pH is adjusted to 8-11 before ultrafiltration, then throughput increases and fouling reduces, but equipment complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing pH adjustment as a controllable variable to optimize ultrafiltration performance. While this adds some equipment complexity, the significant improvements in throughput and reduced fouling justify the added complexity, achieving high flux flow throughput rates.
4Manufacturing precision
If pH is adjusted to 4.0-4.5 before salt removal, then inorganic salts are effectively removed, but additional processing steps are required
Solution Approach 1:
The patent employs parameter changes by adjusting pH to 4.0-4.5 at the salt removal stage to optimize purification quality. This precise pH control enables effective removal of inorganic salts, achieving high manufacturing precision in the final product despite the additional processing step.
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 achieves high flux flow throughput and product concentrations, reducing fouling and enabling efficient separation of hemicelluloses, allowing for cheaper thermal treatment and increased industrial viability.
Implementation Method 1
the pH value of the clear fluid stream after removal of coarse suspended solids is adjusted to pH 8-11, preferably pH 9.0-9.5, whereby the pH value of the incoming effluent stream is adjusted to pH 8-11 and before removal of inorganic salts the pH value is adjusted to 4.0-4.5
Data Source
AI summary
The invention relates to a process for isolation of hemicelluloses from biomass pulping process waters or spent liquors with removal of suspended solids, concentration of the product and purification of the product by removal of inorganic salts and low molecular weight substances. It is characterized in that the hemicellulose isolation process conditions at several separation/purification stages are adjusted separately by e.g. pH adjustment. The invention further relates to a plant for carrying out the process. With such process and plant it is possible to recover most of the suspended solids, especially xylan and other hemicelluloses.