Question:
LTLT pasteurization can be easily carried out in a:
LTLT pasteurization can be easily carried out in a:
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LTLT pasteurization (63$^{\circ}$C for 30 minutes) is a batch process carried out in a jacketed, agitated multi-purpose vat, whereas HTST pasteurization is a continuous process carried out in plate heat exchangers.
Updated On: Aug 7, 2026
- Multi-purpose vat
- Single effect evaporator
- Scraped surface heat exchanger
- Steam injection UHT equipment
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Low-Temperature Long-Time (LTLT) pasteurization, also known as batch pasteurization, involves heating milk to 63$^{\circ}$C and holding it at that temperature for 30 minutes.
This batch process is typically carried out in insulated vessels designed for heating, holding, and cooling.
Step 2: Detailed Explanation:
A multi-purpose vat (or batch pasteurizer) is the standard equipment used for LTLT pasteurization:
1. Jacketed Design: The vat features a double-walled jacketed construction.
Steam or hot water is circulated through the jacket to heat the milk to 63$^{\circ}$C.
2. Agitation: The vat is equipped with an agitator to ensure uniform heat transfer and prevent localized overheating or milk burning on the hot walls.
3. Holding and Cooling: Once the pasteurization temperature is reached, the milk is held for 30 minutes.
Cold water or chilled water is then circulated through the jacket to cool the milk.
Reviewing the other options:
A single-effect evaporator is used to concentrate milk by boiling off water under a vacuum, not for pasteurization.
A scraped surface heat exchanger is used for continuous heating of highly viscous or sticky products.
Steam injection UHT equipment is designed for continuous, high-temperature processing (135--150$^{\circ}$C for a few seconds) rather than batch holding.
Step 3: Final Answer:
Therefore, LTLT pasteurization is typically carried out in a multi-purpose vat.
Low-Temperature Long-Time (LTLT) pasteurization, also known as batch pasteurization, involves heating milk to 63$^{\circ}$C and holding it at that temperature for 30 minutes.
This batch process is typically carried out in insulated vessels designed for heating, holding, and cooling.
Step 2: Detailed Explanation:
A multi-purpose vat (or batch pasteurizer) is the standard equipment used for LTLT pasteurization:
1. Jacketed Design: The vat features a double-walled jacketed construction.
Steam or hot water is circulated through the jacket to heat the milk to 63$^{\circ}$C.
2. Agitation: The vat is equipped with an agitator to ensure uniform heat transfer and prevent localized overheating or milk burning on the hot walls.
3. Holding and Cooling: Once the pasteurization temperature is reached, the milk is held for 30 minutes.
Cold water or chilled water is then circulated through the jacket to cool the milk.
Reviewing the other options:
A single-effect evaporator is used to concentrate milk by boiling off water under a vacuum, not for pasteurization.
A scraped surface heat exchanger is used for continuous heating of highly viscous or sticky products.
Steam injection UHT equipment is designed for continuous, high-temperature processing (135--150$^{\circ}$C for a few seconds) rather than batch holding.
Step 3: Final Answer:
Therefore, LTLT pasteurization is typically carried out in a multi-purpose vat.
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