sucrose extarction Flashcards
Importance of crushing
The crushing of sucrose is done by something called a roller mill, it crushes the cane extremely hard to extract the bagasse aka the sugarcane pulp and the dilute juice.
importance of percipitation
This part of the process occurs in a settling tank. Lime water aka calcium hydroxide is used to precipitate impurities in the dilute juice (which was extracted from the roller mills); CO2 is then bubbled through the juice to precipitate calcium carbonate that carries with it some of the impurities. Lime water is also added to the settling tank to neutralise the acids to prevent sucrose from breaking down into glucose and fructose.
filtration
It makes it possible to remove any impurities from the sucrose and also cleans the mud out so that all of the sucrose may be extracted. The mud is then reused in the sugarcane fields.
vacuum crystallization
prevent charring and caramelisation. The vacuum boiling pan is important because it is used to achieve/get massecuite which is sugar crystals and molasses.
centrifugation - last step
When massecuite is centrifuged (spun in a centrifuge), sugar crystals and molasses are separated from each other resulting in unrefined sugar and molasses.
Describe the extraction of sucrose from sugar cane
Sugar cane is taken from a factory where it is crushed to get the juice out. The juice is then heated until the water evaporates and the syrup forms. The sugar syrup is then boiled until sugar crystals form leaving raw sugar product. Finally, it goes through the centrifuge and white sugar and molasses is derived.
rotary file
The rotary file is used to filter out the muddy impurities from the juice. It also washes the mud so that all the sucrose can be extracted. This produces clear juice which is then sent to the boiler.
role of crystallizer
In the process of crystallisation, the formation of solid crystals occurs through the solution. crystallisation involves the boiling of the syrup at a very low temperature. The low boiling is done under the partial vacuum and during this procedure, some seedlings are also added. Leading to the formation of massecuite, a substance made up of raw sugar crystals and molasses.
why sugar cane is crushed
Sugarcane contains about 70% water. In the milling process, the harvested sugarcane brought to the mill is chopped and passed through crushers to extract juice. This dilute juice is what is used to create sugar
sugar cane has to be crushed in order to obtain the juice which then goes through a multitude of processes to become sugar.
process
crushing
precipitation
filtration
vaccum crystallization
centrifugation
