This document discusses deodorization techniques used in the edible oil refining industry. Deodorization is a vacuum stripping process that removes malodorous compounds from neutral oil to produce fully refined oil. It involves heating the oil to high temperatures under vacuum to strip volatile compounds. There are several commercial deodorizer systems including batch, semi-continuous, continuous, and dual-temperature systems. Continuous deodorizers are best for high-capacity plants running a single feedstock as they allow for low utilities costs, easy maintenance, short residence times, and excellent process control.

2. DEODORIZATION
TECHNIQUES

3. contents
What is Deodorization?
Processing in Industry
Commercial Deodorizer
System
Advantages
Disadvantages

4. Refining of Edible oil

5. Deodorization
• Deodorization is a vacuum stripping process in which
neutral oil is treated to remove malodorous compound (
volatile compound in general) to obtain fully refined oil.
• This process is similar to steam refining of neutral oil
where along with malodorous compound even fatty acids
are also removed. The above process is then known as
steam deodorization.

6. Deodorization Process
Deodorization is actually a combination of Two
different effects on oil.
1) Stripping
2) Temperature effect

7. Deodorization Technology
• Deodorization is a multi step process
comprising de-aeration, heating,
deodorization de-acidification, and cooling
of the oil.
• General overview of Deodorization plant can
be shown as

9. COMMERCIAL
DEODORIZER SYSTEMS
• Batch Deodorization
• Semi-continuous Deodorization
• Continuous Deodorization
• dual-temperature Deodorization

10. Batch Deodorization
• Batch deodorization is especially suitable for
small capacities (<50 ton/day), irregular
production, or in processing small batches of
different oils that demand minimum cross-
contamination.
• Batch deodorizers mainly consist of a single-
shell welded vertical cylindrical vessel.

12. •Advantages :
• very simple
• construction and low capital cost
•Disadvantage:
• Low capacities
• high operating costs (high steam consumption, very low
heat recovery) relatively long processing times
(sometimes up to 8 h)

13. Semi-Continuous
Deodorization
• Basically batch deodorizer, suitable for Large capacity.
• Used when frequent feedstock changes of oil sensitive to
cross contamination.
• Allows efficient Heat Recovery
• Steam produced in the bottom deodorized oil-cooling
section is sent in a closed thermo-siphon loop to the top
bleached oil-heating section to heat the incoming oil.
• Main advantage is shorter hold up time.

15. Continuous Deodorization
• Continuous deodorizer are the best options for high-
capacity plants running on a single feed stock (which
is common in refining plants now a days).
• Horizontal vessels
• Vertical tray-type Deodorizers
• Packed columns

17. Advantages :
• Low utilities cost (high heat recovery)
• Easy maintenance
• Short residence time
• Excellent control of all parameters
Disadvantage:
Contamination during feedstock change.

18. Dual Temperature
Deodorization
Most edible oils are deodorized at high temperature (230-260c), but
there is a growing demand from high processor to low heat
load(residence time at high temperature) during deodorization.
This deodorization is used to minimize the formation of trans fatty
acids in soya beans and canola oils. This negative thermal effect can be
minimized by dual thermal deodorization.
The dual temperature introduced on industrial scale.
Both low and high temperature or high and low temperatures in order to
reach the best compromise between required residence time for actual
deodorization(longer time at low temperature) and heat bleaching and
stripping of volatile components (shorter time at high temperature).