ALLULOSE MEMBRANE SEPARATION
Allulose Isomerization Liquor Membrane Separation & Purification
Start with the sugar composition, proteins and colloids, color, and ash in the isomerization liquor. Use clarification, membrane fractionation, concentration interfaces, and real-sample validation to establish a scalable continuous membrane separation route.
This page does not represent a complete allulose production line. Membrane selection, stream destinations, and the engineering operating window must be determined from the real feed, product objectives, and downstream operations.
First define the target relationship among allulose, fructose, glucose, and other components.
Assess the product and recovery value of each UF, NF, and concentration-membrane stream.
Connect to project-defined decolorization, ion exchange, chromatography, evaporation, or crystallization operations.
DEFINE THE PROCESS STREAM
First identify the process stream being treated
Upstream enzyme-preparation liquor, isomerization liquor, and final syrup or crystallization products in allulose production have different compositions, objectives, and responsibility boundaries. One membrane type cannot be applied simply because the streams belong to the same production line.
Fermentation broth or enzyme-preparation liquor
Assess cells, enzyme proteins, solids, and upstream clarification requirements. Evaluate this stream separately through the fermentation-broth clarification route.
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Allulose isomerization liquor
Organize membrane validation around clarification and protein control, sugar and impurity fractionation, concentration interfaces, and stream mass balance.
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Syrup, crystallization liquor, or intermediate product
Product specifications, chromatography or ion exchange, evaporation and crystallization, and final quality responsibility require separate confirmation within the complete product process.
FEED & PRODUCT SCREENING
Six information groups define membrane selection and validation scope
Preliminary assessment does not start from a fixed membrane model. It starts with what must be retained, what must be controlled, and where each stream ultimately goes.
Sugar composition
Ratios of allulose, fructose, glucose, and other sugars, together with analytical methods and acceptable loss boundaries.
Proteins & colloids
Enzyme proteins, colloids, polysaccharides, fine particles, and their potential association with the target component.
Color & ash
Color bodies, ash, major ions, and other impurities, plus downstream feed restrictions.
Brix & physical-property window
Brix, viscosity, temperature, pH, and batch variation jointly affect mass transfer, fouling, and concentration boundaries.
Product & downstream process
Target syrup or crystallized product and interface requirements for decolorization, ion exchange, chromatography, evaporation, and crystallization.
CIP & product-contact boundaries
Permitted cleaning agents, cleaning temperature, contact materials, and product specifications require confirmation in the project scope.
MEMBRANE ROUTE
Combine clarification, fractionation, and concentration by duty
The modular route below supports engineering discussion; it does not mean every project requires every membrane section. Sample testing and downstream objectives determine the actual sequence, membrane selection, and bypasses.
- 01Isomerization liquor & upstream interfaceConfirm feed position, sugar composition, and batch or continuous supply mode
- 02Pretreatment as requiredScreening, temperature adjustment, or other measures to establish stable membrane feed
- 03Tubular membrane / UF clarificationControl solids, proteins, colloids, and compatible macromolecular impurities
- 04NF purification & fractionationUse membrane screening to determine rejection and passage relationships for target sugars and impurities
- 05Concentration membrane section as requiredAssess the concentration interface where osmotic pressure, viscosity, and product stability are suitable
- 06Downstream refining interfacesConnect to decolorization, ion exchange, chromatography, evaporation, crystallization, or another product operation
Tubular membranes or UF do not directly fractionate low-molecular-weight sugars. The membrane name alone also cannot determine which NF stream is the product. Component analysis and mass balance must define the duty of every membrane section.
STREAM RELATIONSHIPS
Every membrane stage must answer: where does each stream go?
Do not preset the permeate as product or the concentrate as waste. The physical state of the target component, membrane selectivity, and downstream use jointly define product, recovery, and side streams.
Clarification & protein control
- Clarified stream
- Determine whether this stream proceeds to NF or another refining section from sugar loss and protein or colloid-control results.
- Retentate
- Define recycle, recovery, or endpoint from target-component carryover, recovery value, and disposal conditions.
Purification & sugar fractionation
- Permeate
- Confirm the actual sugar profile, impurities, and downstream use through membrane screening and mass balance.
- Concentrate
- Define recovery, recycle, refining, or disposal from the enrichment relationship between target sugars and impurities.
Concentrate, membrane permeate & cleaning side streams
- Concentrate / membrane permeate
- Whether these streams enter the main product line, production reuse, or post-treatment requires separate validation against the relevant quality specification.
- Cleaning & discharge side streams
- Include CIP recovery, discharge, and utility interfaces in the complete mass balance rather than leaving them outside the main product-stream accounting.
SAMPLE TESTING & PILOT VALIDATION
Confirm the route with sugar profiling and mass balance before continuous scale-up
Use real isomerization liquor to confirm target-component destinations, membrane selection, fouling behavior, and cleaning recovery rather than applying data from another functional-sugar project to a new feed.
- 01Data reviewConfirm feed origin, target product, current process, and sample conditions
- 02Sugar-profile & impurity analysisEstablish baselines for sugar composition, protein, color, ash, and physical properties
- 03Membrane screeningCompare candidate membranes for clarification, fractionation, and concentration duties
- 04Bench-scale mass balanceReview target sugars, impurities, and quality changes across every stream
- 05Continuous pilot validationObserve the operating window, fouling, cleaning recovery, and component accumulation
- 06Engineering scale-upDevelop inputs for membrane area, circulation, CIP, controls, and downstream interfaces
DESIGN INPUTS
Feed and product data required for preliminary assessment
Data that more closely represents continuous operating conditions provides a stronger basis for defining test scope, membrane-section duties, and engineering scale-up boundaries.
- Feed origin
- Isomerization-stage position, upstream process, batch or continuous mode, and current treatment equipment
- Sugar composition
- Allulose, fructose, and glucose ratios, analytical methods, and target range
- Proteins & colloids
- Enzyme proteins, polysaccharides, colloids, turbidity, solids, and particle-size information
- Color & ash
- Color bodies, ash, conductivity, major ions, and other priority impurities
- Physical properties
- Brix, viscosity, temperature, pH, density, heat sensitivity, and batch variation
- Product & downstream process
- Target syrup or crystallized product and chromatography, ion-exchange, evaporation, or crystallization interfaces
- CIP & product-contact requirements
- Permitted cleaning agents, cleaning temperature, contact materials, and project product specification
- Validation conditions
- Available sample volume, storage and transport, SDS, test duration, and continuous-pilot conditions
This page does not apply historical project conditions as recovery, product purity, transmittance, energy use, cost, or operating guarantees for a new project. Formal values require sample testing, pilot validation, and the project technical agreement.
PROJECT EVIDENCE
Confirmed allulose membrane separation engineering record
The project capacity demonstrates engineering implementation experience for allulose isomerization-liquor membrane processes only. It does not become a design value, performance value, or product guarantee for a new project.
Allulose isomerization-liquor treatment-capacity record
Implemented membrane sections
UF clarification and protein control, NF fractionation and purification, and a concentration-membrane interface
Public information is limited to capacity, feed type, and the relevant membrane sections. Customer identity, year, recovery, product values, energy use, and cost are not published.
System photographs on this page illustrate an installed functional-sugar membrane setting. They are not attributed to a customer site until the relationship between the image and the specific project is approved.
ENGINEERING BOUNDARY
Confirm each membrane section within the complete product process
Plum supports membrane selection, experimental validation, integrated membrane systems, and engineering interfaces. Enzymatic isomerization, refined-product quality, and non-membrane responsibilities require item-by-item definition for each project.
PLUM may provide
- Preliminary analysis of isomerization liquor, target sugars, and impurity profile
- Membrane screening for clarification, NF fractionation, and concentration
- Sample testing, continuous pilot validation, and mass balance
- Integrated membrane sections, CIP, instrumentation, and controls
- Installation, commissioning, training, and engineering scale-up support
Confirm by project
- Enzymatic isomerization, enzyme preparations, and reaction conditions
- Decolorization, ion exchange, chromatography, evaporation, and crystallization
- Final product specifications, analytical methods, and quality responsibility
- Food-contact requirements, regulatory compliance, and validation responsibility
- Non-membrane side streams, utilities, and plant-wide performance
RELATED RESOURCES
Continue reviewing membrane sections and validation conditions
Business overviewProcess fluid membrane separation
Upstream routeFermentation-broth & hydrolysate clarification
ENGINEERING FAQ
Allulose isomerization-liquor membrane separation FAQ
What duty does each membrane section perform in an allulose route?
Tubular membranes or UF mainly control solids, proteins, colloids, and compatible macromolecular impurities. NF fractionates sugars and impurities under validated conditions. A concentration membrane section is assessed only where osmotic pressure, viscosity, and product objectives are suitable.
Is NF permeate always the allulose product stream?
No. Rejection and passage relationships for target sugars, other sugars, salts, and impurities may differ by membrane. Determine stream identity through sugar-profile analysis and mass balance with the real feed.
Can membrane separation replace chromatography, ion exchange, or decolorization?
There is no universal answer. Membranes may perform one or more separation duties, but product objectives, the impurity profile, and validation results determine whether chromatography, ion exchange, or decolorization is reduced, adjusted, or retained.
Is a concentration membrane section always required after NF?
No. Target-stream concentration, osmotic pressure, viscosity, heat sensitivity, downstream evaporation or crystallization conditions, and the overall mass balance determine whether a concentration membrane section is added.
Why is real allulose-feed sample testing required?
Sugar composition, proteins, color bodies, ash, salts, viscosity, and upstream residues jointly affect membrane selectivity, fouling, and cleaning. Data from another functional-sugar project cannot replace testing of this feed.
Does the membrane system automatically meet product-contact and final-product requirements?
No. Contact materials, cleaning procedures, product specifications, analytical methods, and related regulatory responsibilities require separate confirmation and validation within the project scope.
Can the 2,900 m³/d record serve as a guarantee for a new project?
No. The figure is an anonymous historical project-capacity record only. Membrane selection, stream quality, operating window, and system capability for a new project require new validation and confirmation in the technical agreement.
What information and samples are required for preliminary assessment?
Provide isomerization-liquor origin, sugar profile, proteins, polysaccharides, color, ash and major ions, Brix, viscosity, temperature, pH, current process, product objectives, CIP conditions, SDS, and available sample volume.
REQUEST ALLULOSE VALIDATION
Submit isomerization-liquor composition & product objectivesRequest sample testing & pilot validation
Provide as much detail as possible on the sugar profile, proteins and colloids, color and ash, Brix and physical properties, current process, downstream objectives, and available sample volume. Plum will first review the information, then confirm membrane screening, test scope, and whether pilot validation is required.
Submitted information is used only for preliminary project assessment. It does not constitute a commitment on test scheduling, product quality, engineering performance, regulatory compliance, or scope of supply.