(a) Quiz on GeneralSubject (true or false)

 

1.

Both dextran and invert sugar content in sugar cane will increase as the cane is waiting to mill in the cane yard.

2.

Higher dextran content in cane juice would decrease the efficiency clarification.

3.

High invert content in cane juice will not affect the sugar yield (sugar recovery).

4.

Ideally sugar cane should be milled/crushed within 16 hours after harvest.

5.

Sugar juice at pH 9 is more acidic than at pH 4.

6.

Mixed juice pH is generally below 6.

7.

It is Ok to lime the mixed juice pH to over 6 to minimize the inversion of sucrose.

8.

The pol of bagasse should be below 3.

9.

The water content of bagasse should be below 50%.

10.

For every 1% increase in bagasse moisture, you would loss about one ton of steam per 100 tons of bagasse.

11.

the keys to clarifier operation is to have precise and consistent control of all operating parameter such as temperature, pH, flocculent preparation and addition, and juice flow rate.

12.

The pH of a sugar solution is lower when measured at higher temperature (such as at operating temperature) as compared to that at room temperature. Therefore the pH meter need to be calibrated at operating temperature.

13.

One of the most important operating parameter for effective performance of asettling clarifier (in a sugar mill) is to maintain consistency in temperature control of over 100 oC, preferably 103 to 105 oC, to drive off all the air in sugar juice for suspended matter to sink/settle well.

14.

If and when all the operating parameters are well controlled within the specified limits, the clarifier retention time can be as low as 30 minutes.

15.

Clarifier effluent should be “free” of turbidity in order to minimize evaporator scaling and increase evaporation rate.

16.

One of the important function of clarification is to remove heavy metal , such as lead and arsenic, from sugar juice.

17.

Three effect evaporator has higher energy efficiency than that of four effect evaporator.

18.

A 60 brix sugar syrup consist of 60 % solid and 40 % water.

19.

Evaporator scaling is one of the most difficult and most urgent problem to solve.

20.

Optimal and consistency in Flucculent addition is one the key parameters to minimize % clarifier underflow.

   
   
   
 

last updated 10/30/2017