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Working principle
The system consists of a three-effect evaporation section and an MVR compression section:
Three-effect plate evaporation
The materials enter the first-effect, second-effect and third-effect evaporators in sequence, and are heated step by step by secondary steam, achieving the stepwise utilization of thermal energy.
MVR vapor recompression
The secondary steam generated in the final effect is heated and pressurized by the MVR compressor and then returned to the previous effect as heating steam, thus forming a closed thermal cycle.
Continuous concentration output
The material circulates and evaporates within the system, with its concentration gradually increasing. After reaching the set concentration, it is stably discharged.
This combination significantly reduces the demand for external steam supply and achieves efficient and energy-saving operation.
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Evaporation for Fructose, Sucrose & Starch Syrup
1.Raw sugar solution is filtered to remove suspended solids and may be decolorized and desalted (ion exchange, activated carbon).
2.Feed is pre-heated and deaerated to reduce dissolved oxygen, preventing color formation and oxidation.
3.Falling film multi-effect evaporators are used for gentle concentration. Multiple effects (2–7) improve steam economy.
4.MVR reuses secondary vapor as heating steam, ideal for large continuous sugar syrup plants.
5.Brix is automatically controlled. Concentrated syrup can be used as final product or intermediate.
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Evaporation & Pre-crystallization for Mannitol
Mannitol is commonly produced from hydrogenated starch syrup or extracted from seaweed/plants. Evaporation is used for concentration, impurity reduction and mother liquor recovery.
1.Mannitol Crude Solution Feed
Crude feed contains mannitol, sorbitol and impurities (salts, color). It is pre-filtered and optionally decolorized.
2.Choosing the Right Evaporator Type
(Forced Circulation Evaporator)
For moderate viscosity and foaming, falling film is used. For high solids or fouling, forced circulation is preferred.
3.Evaporation Concentration
Mannitol solution is concentrated to crystallization range (e.g. 40–70% solids, depending on process). Multi-effect + MVR helps save energy.
4.Pre-crystallization Cooling & Stable Operation
Concentrate is cooled with controlled cooling rate to avoid premature crystallization and pipeline blockage. Online density/Brix feedback is used.
5.Mother Liquor Concentration & Recovery
Mother liquor still contains mannitol; it can be recycled to the evaporation system for further concentration, improving overall yield.
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Technical team
Our engineering team is highly experienced and technically strong, with many years of deep involvement in the fields of evaporation and crystallization. We have a thorough understanding of the process characteristics of fructose, sucrose, starch syrup, and polyols such as mannitol. Our process and mechanical engineers are not only familiar with multiple evaporation technologies—multi-effect evaporation, MVR evaporation, falling film and forced circulation evaporators—but also able to design fully customized systems based on each product’s viscosity, heat sensitivity, fouling tendency, and crystallization requirements.
From early-stage material testing and process package design (mass and energy balance), to equipment selection, 3D piping layout, and on-site installation supervision and commissioning, our technical team is involved throughout the entire project. This ensures that every evaporation system we deliver achieves the optimal balance between energy consumption, operational stability, and final product quality. For sensitive products like mannitol, which require precise crystallization conditions, our process engineers can accurately control evaporation concentration, temperature gradients, and circulation velocity to provide a complete solution from concentration to pre-crystallization and mother liquor recovery.
With a deep understanding of industry standards and real production challenges, we can flexibly configure modules such as multi-effect + MVR, CIP cleaning systems, and advanced automation according to each customer’s production scale and plant layout. During project execution, we provide professional training and long-term technical support to ensure the system runs efficiently and reliably over the long term, continuously creating value for our customers’ sugar and mannitol production lines.
Hainan Yongtuo Win-Win International Technology Co., Ltd.
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Room 5091, Block A, Building 1, Phoenix Island, Sanya Central Business District, Tianya District, Sanya City, Hainan Province
