UPTU Previous Question Papers
VI Semester TOT Examination 2006-07
Refining of Oils
Note : Attempt all questions.
All questions carry equal marks.
1. Attempt any two of the following :
(a) What is the importance of degumming of vegetable oils ? Also describe a continuous process for degumming of vegetable oils with help of a neat flow diagram.
(b) Discuss the significance of dewaxing of vegetable oils. Also describe a continuous process of dewaxing with the help of a neat flow diagram.
(c) What are the different phoshphatides present in vegetable oils; also discuss the chemistry of formation of phosphatides and the mechanism of their removal.
2. Attempt any two of the following
(a) What do understand by refining factor and Wesson losses ? Also discuss the criteria for selection of strength of lye for neutralization of crude vegetable oil.
(b) Calculate the amount of 20° Be caustic lye (14.36 gm/ 100ml) required for neutralization of crude vegetable oil with free fatty acid of 1.5% at the flow rate of 10 Tons/hr.
(c) Explain the working of disc-bowl type of centrifuge with help of a neat flow diagram.
3. Attempt any two of the following :
(a) With help of neat flow diagram explain the process of continuous acidulation of soapstock for recovery of acid oil.
(b) What are the color imparting compounds present in oils ? Also discuss any continuous process of bleaching of oils with the help of neat flow diagram.
(c) Discuss the theory of adsorption in bleaching.
Also explain the effect of K and n on bleaching process.
4. Attempt any two of the following :
(a) What is the principle of deodorization ? Also discuss effect of various parameters on deodorization process.
(b) Explain the working of tray type continuous deodorizer with the help of neat diagram.
(c) Give a comparison of continuous and batch deodorization processes. Also explain how deodorization differs from physical refining
5. Attempt any two of the following :
(a) Give a detailed description of important method of energy conservation in vegetable oil refining industry.
(b) Give a detailed account of by-products obtained in refining of crude vegetable oil. Also discuss the utilization of by-products obtained.
(c) Describe the application of Membrane Technology in refining of crude vegetable oils.