Question

Difference between carbonation and sulphatation in cabe juice clarification process

Answer 1

Answer:

Juice Sulphitation is the process of purification of cane juice by employing lime and sulphur dioxide gas. This process generally used for clarification of sugar cane juice in planitation white sugar manufacturing industry.

The juice which is free of Bagacillo & weighed in the weighing tank of pH (5.2-5.3) is heated in the juice heater at 70oC to 75oC. This juice is subjected for continuous liming & sulphitation process to get sufficient removal of non- sugars and finally maintained neutral pH of 7.0 to 7.1.

After the addition of lime and SO2 gas, the sulphited juice heated slightly above the boiling point i.e 102oC to 103oC and it is passed to juice clarifier through the flash tank for setting the mud.

Answer 2

The difference between carbonation and sulphitation in the cane juice clarification process is that in the carbonation process, milk of lime and carbon dioxide is used while in sulphitation process, Sulphur dioxide is used with lime and phosphoric acid.

Explanation:

• In cane sugar production, cane juice clarification is a major process which is involved in it.
• Several methods are used for the clarification of cane juice.
• Two of them are carbonation and sulphitation.
• In the clarification method, milk of lime ($\[Ca{(OH)_2}\]$) and carbon dioxide ($\[C{O_2}\]$) is used as the main detergent.
• The cost of this method is high and it also results in pollution by carbonated mud.
• On the other hand, in the sulphitation method, $\[S{O_2}\]$ along with lime and phosphoric acid ($\[{H_3}P{O_4}\]$).
• This method is better than the carbonation method because of the absorption effect of calcium sulphite (the product of lime and $\[S{O_2}\]$), along with the inhibition of formation of pigment formation due to sulphur dioxide.

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