Terminologies about Evaporation Process

There are some terminologies that should be cleared before understanding about Evaporation process,Undervacuum Evaporation Process,Boiling point,heat of vaporization,Driving force,Steam economy especially Heat Sensitive Products. 

 Six basic terminologies:

1)Evaporation
 2)Boiling Point
 3)Heat of vaporization Driving force
 4)Steam Economy (SE) 
5)Heat-sensitive items

 Evaporation:

 Concentration of aqueous solution involves removal of water from solution by boiling the liquor in suitable vessel,an evaporator and withdrawing the vapors to desire Evaporation is a surface phenomenon.

 Boiling Point:      

 The temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.boiling point depends upon internal vapor pressure.

 Heat of vaporization :

 Heat that need to convert of liquid into its vapors state without change its temperature.

 Driving force:

 The temperature difference between temperature of steam chest(calandria)and product temperature.

 Steam Economy (SE) Ratio of mass of water vapor produced to mass of steam used.

 Heat-sensitive items: 

Heat-sensitive items are any product that may be modified by high temperatures or long-term heat exposure. Many different products can be considered heat-sensitive and also concern with exposure can be quite variable. pulp juices james sugar industry tomato ketchup evaporated milk condensed milk