1. Extraction of Sweetener from Stevia leaves
Muhammad Imran Ahmad*, Zia Shahid, Najmul Hassan, Mumtaz Khan
Department of Chemical Engineering, University of Engineering and Technology, Peshawar, Pakistan
SP-24-P-12
Aim of the Project
Process Flow Diagram
Laboratory Extraction of Sweetener
To design a process for the production of
Stevia based sweetener.
Introduction
Stevia sweetener is 150 to 300 times sweeter than sugar, stable at high temperature, non fermentable, has no calorific value, and it has less side effects as compared to sugar (Brandle et al. 1998).
Feed
(Stevia leaves)
Drying
Liquid extraction
Filtration, and crystallization
Powdered Sweetener
Methodology
Stevia Leaves
Stevia Powder
The major glycosides found in stevia leaves are rebaudioside A (2-10%), steviosides (2-10%), and rebaudioside C (1-2%). Rebaudioside A is the least astringent, least bitter, and least persistent taste.
Literature Study
Experimentation
Material Balances
Energy Balances
Design Calculations
Cost Estimation
Instrumentation & Control
HAZOP Study
Results
Literature Review
Figure 6 Schematic showing sequence
of different steps for project
Experimentation
Extraction
Purification
Heating
Stevia Leaves (powder)
Coagulation
Filtration, and Crystallization
Raw Materials
Figure 2 Effect of different Solvents on Yield
Work Schedule
Table 1 Properties of steviol glycosides
Process will be selected after further literature review (October 2016).
After selection we will carry out experimental work (November 2016).
Material balances and energy balances will be carried out in December 2016.
Design calculations will be carried out in January-February 2017.
Cost estimation, and HAZOP study would be competed in March-April 2017.
Table 2 Operating parameters
S. No
Operating Parameter
Value 1
Temperature C 2
Time (min)
15 min 3 pH
6.8
References
Brandle, J.E., Starratt, A.N., Gijzen, M., Stevia rebaudiana: Its agricultural, biological, and chemical properties, Canadian Journal of Plant Science (1998),
Markosyan, A., Li, S.W., Bu, C., Stevia Extracts, US Patent (2016) US A1.
Figure 3 Effect of temperature on product yield
Figure 8 Particle size distribution
Sustainability in Process Industry (SPI’16), Chemical Engineering Department, UET Peshawar, Oct 19-20, 2016