Abstract
The sugar industry plays a crucial role in numerous economies worldwide, and projections indicate an increase in sugar demand in the coming years. Sugar manufacturing is a complex and highly energy-demanding process, encompassing various sub-processes, including the milling of sugarcane, clarification of raw cane juice, evaporation of syrup, crystallization of syrup, and centrifugation. The crystallization process involves extracting solid sucrose crystals from a supersaturated solution, with supersaturation being a crucial variable. Most previous review articles have focused on specific topics of the crystallization process in the sugar industry. This review aims to provide a broader and updated discussion. It explores various aspects, such as the fundamentals of the process in the sugar industry, a technological description of the three-stage operation, and an analysis of the role of supersaturation. The review examines the main process variables, the most commonly used industrial sensors, and their limitations. Additionally, it discusses the main proposals and approaches found in the literature related to monitoring, modeling, and control of crystallization in the sugar industry. The article identifies and analyzes some limitations present in the literature, including the selection of instruments for industrial monitoring, confusing references to supersaturation sensors, and the need for proper error analysis in the design of process-focused estimators. In particular, there is an emphasis on including information about error bounds for supersaturation estimators.
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Data Availability
No datasets were generated or analysed during the current study.
Abbreviations
- A :
-
Ash content
- a, b, c :
-
mother liquor parameters
- AM :
-
Averaged crystal size (mm)
- B :
-
Mass fraction of dry substance (\(^\circ\)bx)
- c :
-
concentration
- cc :
-
crystal content (\(\%\))
- CV :
-
coeficient of variation (\(\%\))
- \(c_{sol}\) :
-
solubility coefficient
- \(d_v\) :
-
volume increases
- \(D_g\) :
-
growth rate dispersion (mm\(^{2}/\)s)
- F :
-
flow rate (m\(^{3}/\)s)
- G :
-
crystal growth rate (mm/s)
- J :
-
crystallization rate (kg/s)
- L :
-
crystals length (mm)
- m :
-
mass (kg)
- \(\dot{m}\) :
-
mass flow rate (kg/s)
- N :
-
number of crystals
- n :
-
crystal population density
- P :
-
purity (mass fraction of sugar \(\%\))
- p :
-
pressure (bar)
- \(q_{s/w}\) :
-
Sucrose to water ratio for supersaturated solutions (g/g)
- \(q_{ns/w}\) :
-
non sugar/water ratio (g/g)
- \(q_{s/w,sat}\) :
-
Sucrose to water ratio for saturated pure solutions (Solubility) (g/g)
- \(S\!S\) :
-
Supersaturation
- \(S\!S_{cr}\) :
-
Limit Supersaturation
- T :
-
temperature (\(^\circ\)C)
- t :
-
time (s)
- \(\alpha _c\) :
-
crystal parameter
- \(\kappa\) :
-
conductivity (\(\%\))
- \(\eta\) :
-
viscosity
- \(\mu _j\) :
-
Distribution moment
- \(\rho\) :
-
density (kg/m\(^{3}\))
- i :
-
impurities
- f :
-
feed
- sat :
-
saturation
- s :
-
dissolved sucrose
- c :
-
crystal
- w :
-
water
- cw :
-
condensate
- hs :
-
heat steam
- ml :
-
mother liquor
- mg :
-
magma
- vap :
-
emmited vapor
- ATR:
-
Attenuated Total Reflection
- ASTME:
-
Time Series Analysis
- ANN:
-
Artificial Neural Network
- BDPCA:
-
Batch Dynamic PCA
- BPR:
-
Boiling Point Rise
- CSD:
-
Crystal Size Distribution
- DDSS:
-
Data Driven Soft-sensors
- FTIR:
-
Fourier transform infrared
- HTM:
-
Heat and mass Transfer
- HSS:
-
Hybrid Soft-sensors
- IA:
-
Image Analysis
- KBH:
-
Knowledge-based hybrid
- KP:
-
Kinetic parameters
- LF:
-
Fuzzy Logic
- MBSS:
-
Model Based Soft-sensors
- MSE:
-
Mean square error
- MEP:
-
Mass, energy and population balance
- ME:
-
Mass and energy balance
- MP:
-
Mass population balance
- MoEq:
-
From Moment Equations
- MWPCA:
-
Moving Window PCA
- P[MYAMP:
-
ID] Pipe and Instrument Diagram
- PID:
-
Proportional-Integral Derivative Controller
- PLC:
-
Programmable Logic Controller
- PCA:
-
Principal Component Analysis
- PLS:
-
Partial Least Squares
- RTD:
-
Resistance Temperature Detector
- SVM:
-
Support Vector Machines
- TSVR:
-
Twin Support Vector Regression
- UKF:
-
Unscented Kalman Filter
- MPC:
-
Model-Based Predictive Control
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Humberto Morales: Conceptualization, Formal analysis, Writing - Original Draft, Investigation. Fernando di Sciascio: Methodology, Formal Analysis, Writing - Review, Editing, Investigation, Project Administration. Estefania Aguirre-Zapata: Formal Analysis, Writing - Review, Editing, Investigation. Adriana N. Amicarelli: Investigation, Conceptualization, Writing - Review, Supervision, Project Administration.
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Morales, H., di Sciascio, F., Aguirre-Zapata, E. et al. Crystallization Process in the Sugar Industry: A Discussion On Fundamentals, Industrial Practices, Modeling, Estimation and Control. Food Eng Rev (2024). https://doi.org/10.1007/s12393-024-09377-3
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DOI: https://doi.org/10.1007/s12393-024-09377-3